diff --git a/README.md b/README.md
index 19042016..9b18f5f9 100644
--- a/README.md
+++ b/README.md
@@ -63,6 +63,7 @@ This plugin supports UglifyJS features as discussed below:
 | include | RegExp, Array<RegExp> | | Test only `include` files. |
 | exclude | RegExp, Array<RegExp> | | Files to `exclude` from testing. |
 | warningsFilter | function(source) -> boolean | | Allow to filter uglify warnings (since webpack 2.3.0) |
+| parallel | boolean, object | false | Use multi-process parallel running and file cache to improve the build speed. |
 
 <h2 align="center">Mangling</h2>
 
@@ -103,6 +104,14 @@ The `extractComments` option can be
   - `banner`: The banner text that points to the extracted file and will be added on top of the original file. will be added to the original file. Can be `false` (no banner), a `string`, or a `function (string) -> string` that will be called with the filename where extracted comments have been stored. Will be wrapped into comment.
 Default: `/*! For license information please see foo.js.LICENSE */`
 
+<h2 align="center">Run in parallel</h2>
+
+The `parallel` option can be
+
+- `true`: Enable multi-process parallel running with file cache
+- an `object` consisting of the following keys, all optional:
+  - `workers`: The maximum number of concurrent runs. If it is `true`, it is equal to `require('os').cpus().length - 1`.
+  - `cache`: Enable file caching. If it is `true`, it is equal to `"node_modules/.cache/uglifyjs-webpack-plugin"`.
 
 <h2 align="center">Maintainers</h2>
 
diff --git a/package-lock.json b/package-lock.json
index b94aba53..b52bc539 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,10 +10,9 @@
       "dev": true
     },
     "acorn": {
-      "version": "5.0.3",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.0.3.tgz",
-      "integrity": "sha1-xGDfCEkUY/AozLguqzcwvwEIez0=",
-      "dev": true
+      "version": "5.1.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.1.1.tgz",
+      "integrity": "sha512-vOk6uEMctu0vQrvuSqFdJyqj1Q0S5VTDL79qtjo+DhRr+1mmaD+tluFSCZqhvi/JUhXSzoZN2BhtstaPEeE8cw=="
     },
     "acorn-dynamic-import": {
       "version": "2.0.2",
@@ -47,27 +46,23 @@
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
       "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
-      "dev": true,
       "dependencies": {
         "acorn": {
           "version": "3.3.0",
           "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
-          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
-          "dev": true
+          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo="
         }
       }
     },
     "ajv": {
       "version": "4.11.8",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
-      "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
-      "dev": true
+      "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY="
     },
     "ajv-keywords": {
       "version": "1.5.1",
       "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-1.5.1.tgz",
-      "integrity": "sha1-MU3QpLM2j609/NxU7eYXG4htrzw=",
-      "dev": true
+      "integrity": "sha1-MU3QpLM2j609/NxU7eYXG4htrzw="
     },
     "align-text": {
       "version": "0.1.4",
@@ -90,20 +85,17 @@
     "ansi-escapes": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-2.0.0.tgz",
-      "integrity": "sha1-W65SvkJIeN2Xg+iRDj/Cki6DyBs=",
-      "dev": true
+      "integrity": "sha1-W65SvkJIeN2Xg+iRDj/Cki6DyBs="
     },
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-      "dev": true
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
     },
     "ansi-styles": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
-      "dev": true
+      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4="
     },
     "anymatch": {
       "version": "1.3.0",
@@ -123,11 +115,15 @@
       "integrity": "sha1-126/jKlNJ24keja61EpLdKthGZE=",
       "dev": true
     },
+    "aproba": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.1.2.tgz",
+      "integrity": "sha512-ZpYajIfO0j2cOFTO955KUMIKNmj6zhX8kVztMAxFsDaMwz+9Z9SV0uou2pC9HJqcfpffOsjnbrDMvkNy+9RXPw=="
+    },
     "argparse": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
-      "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
-      "dev": true
+      "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY="
     },
     "arr-diff": {
       "version": "2.0.0",
@@ -136,9 +132,9 @@
       "dev": true
     },
     "arr-flatten": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.0.3.tgz",
-      "integrity": "sha1-onTthawIhJtr14R8RYB0XcUa37E=",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
+      "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
       "dev": true
     },
     "array-equal": {
@@ -162,14 +158,12 @@
     "array-union": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
-      "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
-      "dev": true
+      "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk="
     },
     "array-uniq": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
-      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
-      "dev": true
+      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY="
     },
     "array-unique": {
       "version": "0.2.1",
@@ -180,8 +174,7 @@
     "arrify": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
-      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
-      "dev": true
+      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0="
     },
     "asn1": {
       "version": "0.2.3",
@@ -246,8 +239,7 @@
     "babel-code-frame": {
       "version": "6.22.0",
       "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.22.0.tgz",
-      "integrity": "sha1-AnYgvuVnqIwyVhV05/0IAdMxGOQ=",
-      "dev": true
+      "integrity": "sha1-AnYgvuVnqIwyVhV05/0IAdMxGOQ="
     },
     "babel-core": {
       "version": "6.25.0",
@@ -556,9 +548,9 @@
       "dev": true
     },
     "babel-preset-env": {
-      "version": "1.5.2",
-      "resolved": "https://registry.npmjs.org/babel-preset-env/-/babel-preset-env-1.5.2.tgz",
-      "integrity": "sha1-zUrpCm6Utwn5c3SzPl+LmDVWre8=",
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/babel-preset-env/-/babel-preset-env-1.6.0.tgz",
+      "integrity": "sha512-OVgtQRuOZKckrILgMA5rvctvFZPv72Gua9Rt006AiPoB0DJKGN07UmaQA+qRrYgK71MVct8fFhT0EyNWYorVew==",
       "dev": true
     },
     "babel-preset-jest": {
@@ -606,8 +598,7 @@
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
-      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
-      "dev": true
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
     },
     "base64-js": {
       "version": "1.2.1",
@@ -634,6 +625,11 @@
       "integrity": "sha1-SOyNFt9Dd+rl+liEaCSAr02Vx3Q=",
       "dev": true
     },
+    "bluebird": {
+      "version": "3.5.0",
+      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.0.tgz",
+      "integrity": "sha1-eRQg1/VR7qKJdFOop3ZT+WYG1nw="
+    },
     "bn.js": {
       "version": "4.11.7",
       "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.7.tgz",
@@ -663,8 +659,7 @@
     "brace-expansion": {
       "version": "1.1.8",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.8.tgz",
-      "integrity": "sha1-wHshHHyVLsH479Uad+8NHTmQopI=",
-      "dev": true
+      "integrity": "sha1-wHshHHyVLsH479Uad+8NHTmQopI="
     },
     "braces": {
       "version": "1.8.5",
@@ -796,42 +791,37 @@
         }
       }
     },
+    "cacache": {
+      "version": "9.2.9",
+      "resolved": "https://registry.npmjs.org/cacache/-/cacache-9.2.9.tgz",
+      "integrity": "sha512-ghg1j5OyTJ6qsrqU++dN23QiTDxb5AZCFGsF3oB+v9v/gY+F4X8L/0gdQMEjd+8Ot3D29M2etX5PKozHRn2JQw=="
+    },
     "caller-path": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-0.1.0.tgz",
-      "integrity": "sha1-lAhe9jWB7NPaqSREqP6U6CV3dR8=",
-      "dev": true
+      "integrity": "sha1-lAhe9jWB7NPaqSREqP6U6CV3dR8="
     },
     "callsites": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/callsites/-/callsites-0.2.0.tgz",
-      "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo=",
-      "dev": true
+      "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo="
     },
     "camelcase": {
-      "version": "1.2.1",
-      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz",
-      "integrity": "sha1-m7UwTS4LVmmLLHWLCKPqqdqlijk=",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-2.1.1.tgz",
+      "integrity": "sha1-fB0W1nmhu+WcoCys7PsBHiAfWh8=",
       "dev": true
     },
     "camelcase-keys": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/camelcase-keys/-/camelcase-keys-2.1.0.tgz",
       "integrity": "sha1-MIvur/3ygRkFHvodkyITyRuPkuc=",
-      "dev": true,
-      "dependencies": {
-        "camelcase": {
-          "version": "2.1.1",
-          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-2.1.1.tgz",
-          "integrity": "sha1-fB0W1nmhu+WcoCys7PsBHiAfWh8=",
-          "dev": true
-        }
-      }
+      "dev": true
     },
     "caniuse-lite": {
-      "version": "1.0.30000696",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30000696.tgz",
-      "integrity": "sha1-MPJpXSoBoN/XeaJquD9NE0s9pcw=",
+      "version": "1.0.30000697",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30000697.tgz",
+      "integrity": "sha1-El+wBgS2P7sYjblqZnziki3NbN0=",
       "dev": true
     },
     "capture-stack-trace": {
@@ -855,8 +845,7 @@
     "chalk": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
-      "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
-      "dev": true
+      "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg="
     },
     "chokidar": {
       "version": "1.7.0",
@@ -864,6 +853,11 @@
       "integrity": "sha1-eY5ol3gVHIB2tLNg5e3SjNortGg=",
       "dev": true
     },
+    "chownr": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.0.1.tgz",
+      "integrity": "sha1-4qdQQqlVGQi+vSW4Uj1fl2nXkYE="
+    },
     "ci-info": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-1.0.0.tgz",
@@ -871,16 +865,15 @@
       "dev": true
     },
     "cipher-base": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/cipher-base/-/cipher-base-1.0.3.tgz",
-      "integrity": "sha1-7qvxlEGc6QDaMBjCB9IS8qbfCgc=",
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/cipher-base/-/cipher-base-1.0.4.tgz",
+      "integrity": "sha512-Kkht5ye6ZGmwv40uUDZztayT2ThLQGfnj/T71N/XzeZeo3nf8foyW7zGTsPYkEya3m5f3cAypH+qe7YOrM1U2Q==",
       "dev": true
     },
     "circular-json": {
       "version": "0.3.1",
       "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.3.1.tgz",
-      "integrity": "sha1-vos2rvzN6LPKeqLWr8B6NyQsDS0=",
-      "dev": true
+      "integrity": "sha1-vos2rvzN6LPKeqLWr8B6NyQsDS0="
     },
     "cli-boxes": {
       "version": "1.0.0",
@@ -891,8 +884,7 @@
     "cli-cursor": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-2.1.0.tgz",
-      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
-      "dev": true
+      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU="
     },
     "cli-spinners": {
       "version": "0.1.2",
@@ -923,20 +915,26 @@
     "cli-width": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.1.0.tgz",
-      "integrity": "sha1-sjTKIJsp72b8UY2bmNWEewDt8Ao=",
-      "dev": true
+      "integrity": "sha1-sjTKIJsp72b8UY2bmNWEewDt8Ao="
     },
     "cliui": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-2.1.0.tgz",
       "integrity": "sha1-S0dXYP+AJkx2LDoXGQMukcf+oNE=",
-      "dev": true
+      "dev": true,
+      "dependencies": {
+        "wordwrap": {
+          "version": "0.0.2",
+          "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.2.tgz",
+          "integrity": "sha1-t5Zpu0LstAn4PVg8rVLKF+qhZD8=",
+          "dev": true
+        }
+      }
     },
     "co": {
       "version": "4.6.0",
       "resolved": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
-      "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
-      "dev": true
+      "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ="
     },
     "code-point-at": {
       "version": "1.1.0",
@@ -963,11 +961,16 @@
       "dev": true
     },
     "commander": {
-      "version": "2.10.0",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.10.0.tgz",
-      "integrity": "sha512-q/r9trjmuikWDRJNTBHAVnWhuU6w+z80KgBq7j9YDclik5E7X4xi0KnlZBNFA1zOQ+SH/vHMWd2mC9QTOz7GpA==",
+      "version": "2.9.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.9.0.tgz",
+      "integrity": "sha1-nJkJQXbhIkDLItbFFGCYQA/g99Q=",
       "dev": true
     },
+    "commondir": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/commondir/-/commondir-1.0.1.tgz",
+      "integrity": "sha1-3dgA2gxmEnOTzKWVDqloo6rxJTs="
+    },
     "compare-func": {
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/compare-func/-/compare-func-1.3.2.tgz",
@@ -985,14 +988,12 @@
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
-      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
-      "dev": true
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
     },
     "concat-stream": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/concat-stream/-/concat-stream-1.6.0.tgz",
-      "integrity": "sha1-CqxmL9Ur54lk1VMvaUeE5wEQrPc=",
-      "dev": true
+      "integrity": "sha1-CqxmL9Ur54lk1VMvaUeE5wEQrPc="
     },
     "configstore": {
       "version": "3.1.0",
@@ -1120,6 +1121,11 @@
       "integrity": "sha1-ms1whRxtXf3ZPZKC5e35SgP/RrU=",
       "dev": true
     },
+    "copy-concurrently": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/copy-concurrently/-/copy-concurrently-1.0.3.tgz",
+      "integrity": "sha1-Rft4ZiSaHKiJqlcI5svSc+dbslA="
+    },
     "core-js": {
       "version": "2.4.1",
       "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.4.1.tgz",
@@ -1129,8 +1135,7 @@
     "core-util-is": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
-      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
-      "dev": true
+      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
     },
     "cosmiconfig": {
       "version": "1.1.0",
@@ -1230,6 +1235,11 @@
       "integrity": "sha1-mI3zP+qxke95mmE2nddsF635V+o=",
       "dev": true
     },
+    "cyclist": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/cyclist/-/cyclist-0.2.2.tgz",
+      "integrity": "sha1-GzN5LhHpFKL9bW7WRHRkRE5fpkA="
+    },
     "d": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/d/-/d-1.0.0.tgz",
@@ -1277,8 +1287,7 @@
     "debug": {
       "version": "2.6.8",
       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.8.tgz",
-      "integrity": "sha1-5zFTHKLt4n0YgiJCfaF4IdaP9Pw=",
-      "dev": true
+      "integrity": "sha1-5zFTHKLt4n0YgiJCfaF4IdaP9Pw="
     },
     "decamelize": {
       "version": "1.2.0",
@@ -1295,8 +1304,7 @@
     "deep-is": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
-      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
-      "dev": true
+      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ="
     },
     "default-require-extensions": {
       "version": "1.0.0",
@@ -1343,9 +1351,9 @@
       "dev": true
     },
     "diff": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/diff/-/diff-3.2.0.tgz",
-      "integrity": "sha1-yc45Okt8vQsFinJck98pkCeGj/k=",
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-3.3.0.tgz",
+      "integrity": "sha512-w0XZubFWn0Adlsapj9EAWX0FqWdO4tz8kc3RiYdWLh4k/V8PTb6i0SMgXt0vRM3zyKnT8tKO7mUlieRQHIjMNg==",
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     "text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
-      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
-      "dev": true
+      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ="
     },
     "throat": {
       "version": "3.2.0",
@@ -5297,14 +5278,12 @@
     "through": {
       "version": "2.3.8",
       "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
-      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
-      "dev": true
+      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU="
     },
     "through2": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.3.tgz",
-      "integrity": "sha1-AARWmzfHx0ujnEPzzteNGtlBQL4=",
-      "dev": true
+      "integrity": "sha1-AARWmzfHx0ujnEPzzteNGtlBQL4="
     },
     "timed-out": {
       "version": "4.0.1",
@@ -5321,8 +5300,7 @@
     "tmp": {
       "version": "0.0.31",
       "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.31.tgz",
-      "integrity": "sha1-jzirlDjhcxXl29izZX6L+yd65Kc=",
-      "dev": true
+      "integrity": "sha1-jzirlDjhcxXl29izZX6L+yd65Kc="
     },
     "tmpl": {
       "version": "1.0.4",
@@ -5375,8 +5353,7 @@
     "tryit": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/tryit/-/tryit-1.0.3.tgz",
-      "integrity": "sha1-OTvnMKlEb9Hq1tpZoBQwjzbCics=",
-      "dev": true
+      "integrity": "sha1-OTvnMKlEb9Hq1tpZoBQwjzbCics="
     },
     "tty-browserify": {
       "version": "0.0.0",
@@ -5400,14 +5377,12 @@
     "type-check": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
-      "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
-      "dev": true
+      "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I="
     },
     "typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
-      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
-      "dev": true
+      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c="
     },
     "uglify-es": {
       "version": "3.0.24",
@@ -5421,12 +5396,6 @@
         }
       }
     },
-    "uglify-js": {
-      "version": "2.8.29",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.8.29.tgz",
-      "integrity": "sha1-KcVzMUgFe7Th913zW3qcty5qWd0=",
-      "dev": true
-    },
     "uglify-to-browserify": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/uglify-to-browserify/-/uglify-to-browserify-1.0.2.tgz",
@@ -5438,7 +5407,37 @@
       "version": "0.4.6",
       "resolved": "https://registry.npmjs.org/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-0.4.6.tgz",
       "integrity": "sha1-uVH0q7a9YX5m9j64kUmOORdj4wk=",
-      "dev": true
+      "dev": true,
+      "dependencies": {
+        "camelcase": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz",
+          "integrity": "sha1-m7UwTS4LVmmLLHWLCKPqqdqlijk=",
+          "dev": true
+        },
+        "uglify-js": {
+          "version": "2.8.29",
+          "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.8.29.tgz",
+          "integrity": "sha1-KcVzMUgFe7Th913zW3qcty5qWd0=",
+          "dev": true
+        },
+        "yargs": {
+          "version": "3.10.0",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
+          "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
+          "dev": true
+        }
+      }
+    },
+    "unique-filename": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/unique-filename/-/unique-filename-1.1.0.tgz",
+      "integrity": "sha1-0F8v5AMlYIcfMOk8vnNe6iAVFPM="
+    },
+    "unique-slug": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/unique-slug/-/unique-slug-2.0.0.tgz",
+      "integrity": "sha1-22Z258fMBimHj/GWCXx4hVrp9Ks="
     },
     "unique-string": {
       "version": "1.0.0",
@@ -5501,8 +5500,7 @@
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
-      "dev": true
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
     "uuid": {
       "version": "3.1.0",
@@ -5559,15 +5557,15 @@
       "dev": true
     },
     "webpack": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/webpack/-/webpack-3.0.0.tgz",
-      "integrity": "sha1-7pvOvyEkf3FTy0EBaMq0XjpZ1Nc=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/webpack/-/webpack-3.1.0.tgz",
+      "integrity": "sha512-BWF3vW30ZpqscTpIsqUi6gTnXdvoeS+uEcmoAjtg5Yq0xtxebjz8xjDl3AWV4P5Mi3RqS5Xhq+Q5vvcjU3iUAw==",
       "dev": true,
       "dependencies": {
         "ajv": {
-          "version": "5.2.0",
-          "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.2.0.tgz",
-          "integrity": "sha1-wXNQJMXaLvdcwZBxMHPUTwmL9IY=",
+          "version": "5.2.1",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.2.1.tgz",
+          "integrity": "sha1-3NAwRRdYg7obY25a6ew9+auFMjo=",
           "dev": true
         },
         "ajv-keywords": {
@@ -5621,9 +5619,9 @@
       }
     },
     "webpack-defaults": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/webpack-defaults/-/webpack-defaults-1.4.0.tgz",
-      "integrity": "sha512-kuLwz68ZqZw59TdUMoXIw+XRXUNOls8pluuPDlU4lDOBaHcGtjFxEdPESPq1s3slTnA0uk0YgQheVRb3MFnTVg==",
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/webpack-defaults/-/webpack-defaults-1.5.0.tgz",
+      "integrity": "sha1-Xvg7w37CQVmf3eZX2dtnk8Z3lV8=",
       "dev": true
     },
     "webpack-merge": {
@@ -5704,16 +5702,14 @@
       "dev": true
     },
     "wordwrap": {
-      "version": "0.0.2",
-      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.2.tgz",
-      "integrity": "sha1-t5Zpu0LstAn4PVg8rVLKF+qhZD8=",
-      "dev": true
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus="
     },
     "worker-farm": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/worker-farm/-/worker-farm-1.3.1.tgz",
-      "integrity": "sha1-QzMRK7SbF6oFC4eJXKayys9A5f8=",
-      "dev": true
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/worker-farm/-/worker-farm-1.4.1.tgz",
+      "integrity": "sha512-tgFAtgOYLPutkAyzgpS6VJFL5HY+0ui1Tvua+fITgz8ByaJTMFGtazR6xxQfwfiAcbwE+2fLG/K49wc2TfwCNw=="
     },
     "wrap-ansi": {
       "version": "2.1.0",
@@ -5738,14 +5734,12 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-      "dev": true
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
     "write": {
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
-      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
-      "dev": true
+      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c="
     },
     "write-file-atomic": {
       "version": "2.1.0",
@@ -5768,26 +5762,49 @@
     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
-      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
-      "dev": true
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
     },
     "y18n": {
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
-      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
-      "dev": true
+      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE="
     },
     "yallist": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
-      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
-      "dev": true
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI="
     },
     "yargs": {
-      "version": "3.10.0",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
-      "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
-      "dev": true
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-7.1.0.tgz",
+      "integrity": "sha1-a6MY6xaWFyf10oT46gA+jWFU0Mg=",
+      "dev": true,
+      "dependencies": {
+        "camelcase": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
+          "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo=",
+          "dev": true
+        },
+        "cliui": {
+          "version": "3.2.0",
+          "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
+          "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
+          "dev": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "dev": true
+        },
+        "string-width": {
+          "version": "1.0.2",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "dev": true
+        }
+      }
     },
     "yargs-parser": {
       "version": "5.0.0",
diff --git a/package.json b/package.json
index 69bc60c0..cd9b8115 100644
--- a/package.json
+++ b/package.json
@@ -30,9 +30,12 @@
     "webpack-defaults": "webpack-defaults"
   },
   "dependencies": {
+    "cacache": "^9.2.9",
+    "find-cache-dir": "^1.0.0",
     "source-map": "^0.5.6",
     "uglify-es": "^3.0.24",
-    "webpack-sources": "^1.0.1"
+    "webpack-sources": "^1.0.1",
+    "worker-farm": "^1.4.1"
   },
   "devDependencies": {
     "babel-cli": "^6.24.1",
diff --git a/src/index.js b/src/index.js
index 1730f2b9..c8573915 100644
--- a/src/index.js
+++ b/src/index.js
@@ -7,7 +7,7 @@ import { SourceMapConsumer } from 'source-map';
 import { SourceMapSource, RawSource, ConcatSource } from 'webpack-sources';
 import RequestShortener from 'webpack/lib/RequestShortener';
 import ModuleFilenameHelpers from 'webpack/lib/ModuleFilenameHelpers';
-import uglify from 'uglify-es';
+import Uglify from './uglify';
 
 /* eslint-disable
   no-param-reassign
@@ -15,15 +15,6 @@ import uglify from 'uglify-es';
 
 const warningRegex = /\[.+:([0-9]+),([0-9]+)\]/;
 
-const defaultUglifyOptions = {
-  output: {
-    comments: /^\**!|@preserve|@license|@cc_on/,
-    beautify: false,
-    semicolons: true,
-    shebang: true,
-  },
-};
-
 class UglifyJsPlugin {
   constructor(options) {
     if (typeof options !== 'object' || Array.isArray(options)) {
@@ -34,23 +25,8 @@ class UglifyJsPlugin {
 
     this.options.test = this.options.test || /\.js($|\?)/i;
     this.options.warningsFilter = this.options.warningsFilter || (() => true);
-
-    this.uglifyOptions = this.options.uglifyOptions || {};
-  }
-
-  static buildDefaultUglifyOptions({ ecma, warnings, parse = {}, compress = {}, mangle, output, toplevel, ie8 }) {
-    return {
-      ecma,
-      warnings,
-      parse,
-      compress,
-      mangle: mangle == null ? true : mangle,
-      // Ignoring sourcemap from options
-      sourceMap: null,
-      output: { ...defaultUglifyOptions.output, ...output },
-      toplevel,
-      ie8,
-    };
+    this.options.uglifyOptions = this.options.uglifyOptions || {};
+    this.options.parallel = this.options.parallel || {};
   }
 
   static buildError(err, file, sourceMap, requestShortener) {
@@ -64,10 +40,10 @@ class UglifyJsPlugin {
         return new Error(`${file} from UglifyJs\n${err.message} [${requestShortener.shorten(original.source)}:${original.line},${original.column}][${file}:${err.line},${err.col}]`);
       }
       return new Error(`${file} from UglifyJs\n${err.message} [${file}:${err.line},${err.col}]`);
-    } else if (err.msg) {
-      return new Error(`${file} from UglifyJs\n${err.msg}`);
+    } else if (err.stack) {
+      return new Error(`${file} from UglifyJs\n${err.stack}`);
     }
-    return new Error(`${file} from UglifyJs\n${err.stack}`);
+    return new Error(`${file} from UglifyJs\n${err.message}`);
   }
 
   static buildWarnings(warnings, file, sourceMap, warningsFilter, requestShortener) {
@@ -91,71 +67,9 @@ class UglifyJsPlugin {
     }, []);
   }
 
-  static buildCommentsFunction(options, uglifyOptions, extractedComments) {
-    const condition = {};
-    const commentsOpts = uglifyOptions.output.comments;
-    if (typeof options.extractComments === 'string' || options.extractComments instanceof RegExp) {
-      // extractComments specifies the extract condition and commentsOpts specifies the preserve condition
-      condition.preserve = commentsOpts;
-      condition.extract = options.extractComments;
-    } else if (Object.prototype.hasOwnProperty.call(options.extractComments, 'condition')) {
-      // Extract condition is given in extractComments.condition
-      condition.preserve = commentsOpts;
-      condition.extract = options.extractComments.condition;
-    } else {
-      // No extract condition is given. Extract comments that match commentsOpts instead of preserving them
-      condition.preserve = false;
-      condition.extract = commentsOpts;
-    }
-
-    // Ensure that both conditions are functions
-    ['preserve', 'extract'].forEach((key) => {
-      let regexStr;
-      let regex;
-      switch (typeof (condition[key])) {
-        case 'boolean':
-          condition[key] = condition[key] ? () => true : () => false;
-          break;
-        case 'function':
-          break;
-        case 'string':
-          if (condition[key] === 'all') {
-            condition[key] = () => true;
-            break;
-          }
-          if (condition[key] === 'some') {
-            condition[key] = (astNode, comment) => comment.type === 'comment2' && /@preserve|@license|@cc_on/i.test(comment.value);
-            break;
-          }
-          regexStr = condition[key];
-          condition[key] = (astNode, comment) => new RegExp(regexStr).test(comment.value);
-          break;
-        default:
-          regex = condition[key];
-          condition[key] = (astNode, comment) => (regex.test(comment.value));
-      }
-    });
-
-    // Redefine the comments function to extract and preserve
-    // comments according to the two conditions
-    return (astNode, comment) => {
-      if (condition.extract(astNode, comment)) {
-        extractedComments.push(
-          comment.type === 'comment2' ? `/*${comment.value}*/` : `//${comment.value}`,
-        );
-      }
-      return condition.preserve(astNode, comment);
-    };
-  }
-
   apply(compiler) {
     const requestShortener = new RequestShortener(compiler.context);
-    // Copy uglify options
-    const uglifyOptions = UglifyJsPlugin.buildDefaultUglifyOptions(this.uglifyOptions);
-    // Making sure output options exists if there is an extractComments options
-    if (this.options.extractComments) {
-      uglifyOptions.output = uglifyOptions.output || {};
-    }
+
 
     compiler.plugin('compilation', (compilation) => {
       if (this.options.sourceMap) {
@@ -166,13 +80,13 @@ class UglifyJsPlugin {
       }
 
       compilation.plugin('optimize-chunk-assets', (chunks, callback) => {
+        const uglify = new Uglify(this.options.parallel);
         const uglifiedAssets = new WeakSet();
+        const tasks = [];
         chunks.reduce((acc, chunk) => acc.concat(chunk.files || []), [])
           .concat(compilation.additionalChunkAssets || [])
           .filter(ModuleFilenameHelpers.matchObject.bind(null, this.options))
           .forEach((file) => {
-            // Reseting sourcemap to null
-            uglifyOptions.sourceMap = null;
             let sourceMap;
             const asset = compilation.assets[file];
             if (uglifiedAssets.has(asset)) {
@@ -182,6 +96,7 @@ class UglifyJsPlugin {
             try {
               let input;
               let inputSourceMap;
+              const cacheKey = `${compiler.outputPath}/${file}`;
               if (this.options.sourceMap) {
                 if (asset.sourceAndMap) {
                   const sourceAndMap = asset.sourceAndMap();
@@ -192,89 +107,104 @@ class UglifyJsPlugin {
                   input = asset.source();
                 }
                 sourceMap = new SourceMapConsumer(inputSourceMap);
-                // Add source map data
-                uglifyOptions.sourceMap = {
-                  content: inputSourceMap,
-                };
               } else {
                 input = asset.source();
               }
 
               // Handling comment extraction
-              const extractedComments = [];
               let commentsFile = false;
               if (this.options.extractComments) {
-                uglifyOptions.output.comments = UglifyJsPlugin.buildCommentsFunction(this.options, uglifyOptions, extractedComments);
-
                 commentsFile = this.options.extractComments.filename || `${file}.LICENSE`;
                 if (typeof commentsFile === 'function') {
                   commentsFile = commentsFile(file);
                 }
               }
 
-              // Calling uglify
-              const { error, map, code, warnings } = uglify.minify({ [file]: input }, uglifyOptions);
+              tasks.push({
+                cacheKey,
+                file,
+                input,
+                sourceMap,
+                inputSourceMap,
+                commentsFile,
+                extractComments: this.options.extractComments,
+                uglifyOptions: this.options.uglifyOptions,
+              });
+            } catch (error) {
+              compilation.errors.push(UglifyJsPlugin.buildError(error, file, sourceMap, compilation, requestShortener));
+            }
+          });
 
-              // Handling results
-              // Error case: add errors, and go to next file
-              if (error) {
-                compilation.errors.push(UglifyJsPlugin.buildError(error, file, sourceMap, compilation, requestShortener));
-                return;
-              }
+        uglify.runTasks(tasks, (tasksError, results) => {
+          if (tasksError) {
+            compilation.errors.push(tasksError);
+            return;
+          }
 
-              let outputSource;
-              if (map) {
-                outputSource = new SourceMapSource(code, file, JSON.parse(map), input, inputSourceMap);
-              } else {
-                outputSource = new RawSource(code);
-              }
+          results.forEach((data, index) => {
+            const { file, input, sourceMap, inputSourceMap, commentsFile } = tasks[index];
+            const { error, map, code, warnings, extractedComments } = data;
+
+            // Handling results
+            // Error case: add errors, and go to next file
+            if (error) {
+              compilation.errors.push(UglifyJsPlugin.buildError(error, file, sourceMap, compilation, requestShortener));
+              return;
+            }
+
+            let outputSource;
+            if (map) {
+              outputSource = new SourceMapSource(code, file, JSON.parse(map), input, inputSourceMap);
+            } else {
+              outputSource = new RawSource(code);
+            }
 
-              // Write extracted comments to commentsFile
-              if (commentsFile && extractedComments.length > 0) {
-                // Add a banner to the original file
-                if (this.options.extractComments.banner !== false) {
-                  let banner = this.options.extractComments.banner || `For license information please see ${commentsFile}`;
-                  if (typeof banner === 'function') {
-                    banner = banner(commentsFile);
-                  }
-                  if (banner) {
-                    outputSource = new ConcatSource(
-                      `/*! ${banner} */\n`, outputSource,
-                    );
-                  }
+            // Write extracted comments to commentsFile
+            if (commentsFile && extractedComments.length > 0) {
+              // Add a banner to the original file
+              if (this.options.extractComments.banner !== false) {
+                let banner = this.options.extractComments.banner || `For license information please see ${commentsFile}`;
+                if (typeof banner === 'function') {
+                  banner = banner(commentsFile);
+                }
+                if (banner) {
+                  outputSource = new ConcatSource(
+                    `/*! ${banner} */\n`, outputSource,
+                  );
                 }
+              }
 
-                const commentsSource = new RawSource(`${extractedComments.join('\n\n')}\n`);
-                if (commentsFile in compilation.assets) {
-                  // commentsFile already exists, append new comments...
-                  if (compilation.assets[commentsFile] instanceof ConcatSource) {
-                    compilation.assets[commentsFile].add('\n');
-                    compilation.assets[commentsFile].add(commentsSource);
-                  } else {
-                    compilation.assets[commentsFile] = new ConcatSource(
-                      compilation.assets[commentsFile], '\n', commentsSource,
-                    );
-                  }
+              const commentsSource = new RawSource(`${extractedComments.join('\n\n')}\n`);
+              if (commentsFile in compilation.assets) {
+                // commentsFile already exists, append new comments...
+                if (compilation.assets[commentsFile] instanceof ConcatSource) {
+                  compilation.assets[commentsFile].add('\n');
+                  compilation.assets[commentsFile].add(commentsSource);
                 } else {
-                  compilation.assets[commentsFile] = commentsSource;
+                  compilation.assets[commentsFile] = new ConcatSource(
+                    compilation.assets[commentsFile], '\n', commentsSource,
+                  );
                 }
+              } else {
+                compilation.assets[commentsFile] = commentsSource;
               }
+            }
 
-              // Updating assets
-              uglifiedAssets.add(compilation.assets[file] = outputSource);
+            // Updating assets
+            uglifiedAssets.add(compilation.assets[file] = outputSource);
 
-              // Handling warnings
-              if (warnings) {
-                const warnArr = UglifyJsPlugin.buildWarnings(warnings, file, sourceMap, this.options.warningsFilter, requestShortener);
-                if (warnArr.length > 0) {
-                  compilation.warnings.push(new Error(`${file} from UglifyJs\n${warnArr.join('\n')}`));
-                }
+            // Handling warnings
+            if (warnings) {
+              const warnArr = UglifyJsPlugin.buildWarnings(warnings, file, sourceMap, this.options.warningsFilter, requestShortener);
+              if (warnArr.length > 0) {
+                compilation.warnings.push(new Error(`${file} from UglifyJs\n${warnArr.join('\n')}`));
               }
-            } catch (error) {
-              compilation.errors.push(UglifyJsPlugin.buildError(error, file, sourceMap, compilation, requestShortener));
             }
           });
-        callback();
+
+          uglify.exit();
+          callback();
+        });
       });
     });
   }
diff --git a/src/uglify/cache.js b/src/uglify/cache.js
new file mode 100644
index 00000000..8c5f36e8
--- /dev/null
+++ b/src/uglify/cache.js
@@ -0,0 +1,20 @@
+import crypto from 'crypto';
+import cacache from 'cacache';
+
+const sha512 = 'sha512';
+const getHash = data => `${sha512}-${
+  crypto.createHash(sha512).update(data).digest('base64')
+}`;
+
+export const get = (cacheDirectory, key, identifier) => cacache.get(cacheDirectory, key).then(({ data, metadata }) => {
+  const hash = getHash(identifier);
+  if (metadata.hash !== hash) {
+    return Promise.reject(new Error('The cache has expired'));
+  }
+  return JSON.parse(data);
+});
+
+export const put = (cacheDirectory, key, data, identifier) => {
+  const hash = getHash(identifier);
+  return cacache.put(cacheDirectory, key, JSON.stringify(data), { metadata: { hash } });
+};
diff --git a/src/uglify/index.js b/src/uglify/index.js
new file mode 100644
index 00000000..0f596517
--- /dev/null
+++ b/src/uglify/index.js
@@ -0,0 +1,90 @@
+import os from 'os';
+import findCacheDir from 'find-cache-dir';
+import workerFarm from 'worker-farm';
+import minify from './minify';
+import { get, put } from './cache';
+import { encode } from './serialization';
+import versions from './versions';
+
+let workerFile = require.resolve('./worker');
+
+try {
+  // run test
+  workerFile = require.resolve('../../dist/uglify/worker');
+} catch (e) { } // eslint-disable-line no-empty
+
+export default class {
+  constructor(parallel = {}) {
+    let options = parallel;
+    if (typeof parallel === 'boolean') {
+      options = { cache: parallel, workers: parallel };
+    }
+    const { cache, workers } = options;
+    this.cache = cache === true ? findCacheDir({ name: 'uglifyjs-webpack-plugin' }) : cache;
+    this.workers = workers === true ? os.cpus().length - 1 : Math.min(Number(workers) || 0, os.cpus().length - 1);
+  }
+
+  worker(options, callback) {
+    if (this.workers > 0) {
+      this.workerFarm = workerFarm({
+        maxConcurrentWorkers: this.workers,
+      }, workerFile);
+      this.worker = (opt, cb) => this.workerFarm(JSON.stringify(opt, encode), cb);
+    } else {
+      this.worker = (opt, cb) => {
+        try {
+          const result = minify(opt);
+          cb(null, result);
+        } catch (errors) {
+          cb(errors);
+        }
+      };
+    }
+
+    this.worker(options, callback);
+  }
+
+  exit() {
+    if (this.workerFarm) {
+      workerFarm.end(this.workerFarm);
+    }
+  }
+
+  runTasks(tasks, callback) {
+    if (!tasks.length) {
+      callback(null, []);
+      return;
+    }
+
+    let toRun = tasks.length;
+    const results = [];
+    const step = (index, data) => {
+      toRun -= 1;
+      results[index] = data;
+      if (!toRun) {
+        callback(null, results);
+      }
+    };
+
+    tasks.forEach((task, index) => {
+      const cacheIdentifier = `${versions.uglify}|${versions.plugin}|${task.input}`;
+      const enqueue = () => {
+        this.worker(task, (error, data) => {
+          const result = error ? { error } : data;
+          const done = () => step(index, result);
+          if (this.cache && !result.error) {
+            put(this.cache, task.cacheKey, data, cacheIdentifier).then(done, done);
+          } else {
+            done();
+          }
+        });
+      };
+      if (this.cache) {
+        get(this.cache, task.cacheKey, cacheIdentifier).then(data => step(index, data), enqueue);
+      } else {
+        enqueue();
+      }
+    });
+  }
+}
+
diff --git a/src/uglify/minify.js b/src/uglify/minify.js
new file mode 100644
index 00000000..3ea0930d
--- /dev/null
+++ b/src/uglify/minify.js
@@ -0,0 +1,102 @@
+import uglify from 'uglify-es';
+
+const buildDefaultUglifyOptions = ({ ecma, warnings, parse = {}, compress = {}, mangle, output, toplevel, ie8 }) => {
+  return {
+    ecma,
+    warnings,
+    parse,
+    compress,
+    mangle: mangle == null ? true : mangle,
+    // Ignoring sourcemap from options
+    sourceMap: null,
+    output: {
+      comments: /^\**!|@preserve|@license|@cc_on/,
+      beautify: false,
+      semicolons: true,
+      shebang: true,
+      ...output,
+    },
+    toplevel,
+    ie8,
+  };
+};
+
+const buildComments = (options, uglifyOptions, extractedComments) => {
+  const condition = {};
+  const commentsOpts = uglifyOptions.output.comments;
+  if (typeof options.extractComments === 'string' || options.extractComments instanceof RegExp) {
+    // extractComments specifies the extract condition and commentsOpts specifies the preserve condition
+    condition.preserve = commentsOpts;
+    condition.extract = options.extractComments;
+  } else if (Object.prototype.hasOwnProperty.call(options.extractComments, 'condition')) {
+    // Extract condition is given in extractComments.condition
+    condition.preserve = commentsOpts;
+    condition.extract = options.extractComments.condition;
+  } else {
+    // No extract condition is given. Extract comments that match commentsOpts instead of preserving them
+    condition.preserve = false;
+    condition.extract = commentsOpts;
+  }
+
+  // Ensure that both conditions are functions
+  ['preserve', 'extract'].forEach((key) => {
+    let regexStr;
+    let regex;
+    switch (typeof (condition[key])) {
+      case 'boolean':
+        condition[key] = condition[key] ? () => true : () => false;
+        break;
+      case 'function':
+        break;
+      case 'string':
+        if (condition[key] === 'all') {
+          condition[key] = () => true;
+          break;
+        }
+        if (condition[key] === 'some') {
+          condition[key] = (astNode, comment) => comment.type === 'comment2' && /@preserve|@license|@cc_on/i.test(comment.value);
+          break;
+        }
+        regexStr = condition[key];
+        condition[key] = (astNode, comment) => new RegExp(regexStr).test(comment.value);
+        break;
+      default:
+        regex = condition[key];
+        condition[key] = (astNode, comment) => (regex.test(comment.value));
+    }
+  });
+
+  // Redefine the comments function to extract and preserve
+  // comments according to the two conditions
+  return (astNode, comment) => {
+    if (condition.extract(astNode, comment)) {
+      extractedComments.push(
+        comment.type === 'comment2' ? `/*${comment.value}*/` : `//${comment.value}`,
+      );
+    }
+    return condition.preserve(astNode, comment);
+  };
+};
+
+const minify = (options) => {
+  const { file, input, inputSourceMap, extractComments } = options;
+  // Copy uglify options
+  const uglifyOptions = buildDefaultUglifyOptions(options.uglifyOptions || {});
+
+  // Add source map data
+  if (inputSourceMap) {
+    uglifyOptions.sourceMap = {
+      content: inputSourceMap,
+    };
+  }
+
+  const extractedComments = [];
+  if (extractComments) {
+    uglifyOptions.output.comments = buildComments(options, uglifyOptions, extractedComments);
+  }
+
+  const { error, map, code, warnings } = uglify.minify({ [file]: input }, uglifyOptions);
+  return { error, map, code, warnings, extractedComments };
+};
+
+export default minify;
diff --git a/src/uglify/serialization.js b/src/uglify/serialization.js
new file mode 100644
index 00000000..7ac19574
--- /dev/null
+++ b/src/uglify/serialization.js
@@ -0,0 +1,34 @@
+/* eslint-disable no-new-func */
+const toType = value => (Object.prototype.toString.call(value).slice(8, -1));
+
+export const encode = (key, value) => {
+  const type = toType(value);
+  if (encode[type]) {
+    return `<${type}>${encode[type](value, key)}`;
+  }
+  return value;
+};
+
+encode.RegExp = value => String(value);
+encode.Function = value => String(value);
+
+export const decode = (key, value) => {
+  if (typeof value === 'string') {
+    const regex = /^<([A-Z]\w+)>([\w\W]*)$/;
+    const match = value.match(regex);
+    if (match && decode[match[1]]) {
+      return decode[match[1]](match[2], key);
+    }
+  }
+
+  return value;
+};
+
+decode.RegExp = value => (Function(`return ${value}`)());
+decode.Function = (value, key) => Function(`
+  try {
+    return ${value}.apply(null, arguments);
+  } catch(err) {
+    throw new Error('the option "${key}" performs an error in the child process: ' + err.message);
+  }
+`);
diff --git a/src/uglify/versions.js b/src/uglify/versions.js
new file mode 100644
index 00000000..d398e951
--- /dev/null
+++ b/src/uglify/versions.js
@@ -0,0 +1,5 @@
+export default {
+  uglify: require('uglify-es/package.json').version, // eslint-disable-line global-require
+  plugin: require('../../package.json').version, // eslint-disable-line global-require
+};
+
diff --git a/src/uglify/worker.js b/src/uglify/worker.js
new file mode 100644
index 00000000..924d544a
--- /dev/null
+++ b/src/uglify/worker.js
@@ -0,0 +1,10 @@
+import minify from './minify';
+import { decode } from './serialization';
+
+module.exports = (options, callback) => {
+  try {
+    callback(null, minify(JSON.parse(options, decode)));
+  } catch (errors) {
+    callback(errors);
+  }
+};
diff --git a/test/__snapshots__/parallel-options.test.js.snap b/test/__snapshots__/parallel-options.test.js.snap
new file mode 100644
index 00000000..868100bb
--- /dev/null
+++ b/test/__snapshots__/parallel-options.test.js.snap
@@ -0,0 +1,9 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`errors 1`] = `Array []`;
+
+exports[`main.0c220ec66316af2c1b24.js 1`] = `"webpackJsonp([0],[function(o,n){o.exports=function(){console.log(7)}}],[0]);"`;
+
+exports[`manifest.6afe1bc6685e9ab36c1c.js 1`] = `"!function(e){function n(r){if(t[r])return t[r].exports;var o=t[r]={i:r,l:!1,exports:{}};return e[r].call(o.exports,o,o.exports,n),o.l=!0,o.exports}var r=window.webpackJsonp;window.webpackJsonp=function(t,c,a){for(var i,u,f,l=0,s=[];l<t.length;l++)u=t[l],o[u]&&s.push(o[u][0]),o[u]=0;for(i in c)Object.prototype.hasOwnProperty.call(c,i)&&(e[i]=c[i]);for(r&&r(t,c,a);s.length;)s.shift()();if(a)for(l=0;l<a.length;l++)f=n(n.s=a[l]);return f};var t={},o={1:0};n.e=function(e){function r(){i.onerror=i.onload=null,clearTimeout(u);var n=o[e];0!==n&&(n&&n[1](new Error(\\"Loading chunk \\"+e+\\" failed.\\")),o[e]=void 0)}var t=o[e];if(0===t)return new Promise(function(e){e()});if(t)return t[2];var c=new Promise(function(n,r){t=o[e]=[n,r]});t[2]=c;var a=document.getElementsByTagName(\\"head\\")[0],i=document.createElement(\\"script\\");i.type=\\"text/javascript\\",i.charset=\\"utf-8\\",i.async=!0,i.timeout=12e4,n.nc&&i.setAttribute(\\"nonce\\",n.nc),i.src=n.p+\\"\\"+e+\\".\\"+({0:\\"main\\"}[e]||e)+\\".\\"+{0:\\"0c220ec66316af2c1b24\\"}[e]+\\".js\\";var u=setTimeout(r,12e4);return i.onerror=i.onload=r,a.appendChild(i),c},n.m=e,n.c=t,n.d=function(e,r,t){n.o(e,r)||Object.defineProperty(e,r,{configurable:!1,enumerable:!0,get:t})},n.n=function(e){var r=e&&e.__esModule?function(){return e.default}:function(){return e};return n.d(r,\\"a\\",r),r},n.o=function(e,n){return Object.prototype.hasOwnProperty.call(e,n)},n.p=\\"\\",n.oe=function(e){throw console.error(e),e}}([]);"`;
+
+exports[`warnings 1`] = `Array []`;
diff --git a/test/all-options.test.js b/test/all-options.test.js
index db8f36be..56f45616 100644
--- a/test/all-options.test.js
+++ b/test/all-options.test.js
@@ -267,6 +267,19 @@ describe('when applied with all options', () => {
           });
         });
 
+        it('extracts license information to separate file', () => {
+          compilationEventBinding.handler([{
+            files: ['test4.js'],
+          }], () => {
+            expect(compilation.errors.length).toBe(0);
+            /* eslint-disable no-underscore-dangle */
+            expect(compilation.assets['test4.license.js'].source()).toContain('/*! this comment should be extracted */');
+            expect(compilation.assets['test4.license.js'].source()).toContain('// another comment that should be extracted to a separate file');
+            expect(compilation.assets['test4.license.js'].source()).not.toEqual(expect.stringContaining('/* this will not be extracted */'));
+            /* eslint-enable no-underscore-dangle */
+          });
+        });
+
         describe('with warningsFilter set', () => {
           describe('and the filter returns true', () => {
             beforeEach(() => {
@@ -374,19 +387,6 @@ describe('when applied with all options', () => {
             });
           });
         });
-
-        it('extracts license information to separate file', () => {
-          compilationEventBinding.handler([{
-            files: ['test4.js'],
-          }], () => {
-            expect(compilation.errors.length).toBe(0);
-            /* eslint-disable no-underscore-dangle */
-            expect(compilation.assets['test4.license.js']._value).toEqual(expect.stringContaining('/*! this comment should be extracted */'));
-            expect(compilation.assets['test4.license.js']._value).toEqual(expect.stringContaining('// another comment that should be extracted to a separate file'));
-            expect(compilation.assets['test4.license.js']._value).not.toEqual(expect.stringContaining('/* this will not be extracted */'));
-            /* eslint-enable no-underscore-dangle */
-          });
-        });
       });
     });
   });
diff --git a/test/empty-options.test.js b/test/empty-options.test.js
index 44f7e363..605e45b3 100644
--- a/test/empty-options.test.js
+++ b/test/empty-options.test.js
@@ -95,8 +95,10 @@ describe('when applied with no options', () => {
 
         it('only calls callback once', () => {
           callback = jest.fn();
-          compilationEventBinding.handler([''], callback);
-          expect(callback.mock.calls.length).toBe(1);
+          compilationEventBinding.handler([''], () => {
+            callback();
+            expect(callback.mock.calls.length).toBe(1);
+          });
         });
 
         it('default only parses filenames ending with .js', () => {
@@ -121,7 +123,7 @@ describe('when applied with no options', () => {
           }], () => {
             expect(compilation.errors.length).toBe(1);
             expect(compilation.errors[0]).toBeInstanceOf(Error);
-            expect(compilation.errors[0].message).toEqual(expect.stringContaining('TypeError'));
+            expect(compilation.errors[0].message).toEqual(expect.stringContaining('asset.source is not a function'));
           });
         });
 
diff --git a/test/extract-comments-options.test.js b/test/extract-comments-options.test.js
index 54d6386c..e050bfd0 100644
--- a/test/extract-comments-options.test.js
+++ b/test/extract-comments-options.test.js
@@ -71,7 +71,7 @@ describe('when options.extractComments', () => {
     });
   });
 
-  describe('normalizes when options.extractComments is regex', () => {
+  it('normalizes when options.extractComments is regex', () => {
     const pluginEnvironment = new PluginEnvironment();
     const compilerEnv = pluginEnvironment.getEnvironmentStub();
     compilerEnv.context = '';
@@ -105,7 +105,7 @@ describe('when options.extractComments', () => {
     });
   });
 
-  describe('converts boolean options.extractComments.condition to function', () => {
+  it('converts boolean options.extractComments.condition to function', () => {
     const pluginEnvironment = new PluginEnvironment();
     const compilerEnv = pluginEnvironment.getEnvironmentStub();
     compilerEnv.context = '';
diff --git a/test/parallel-options.test.js b/test/parallel-options.test.js
new file mode 100644
index 00000000..8f29bed8
--- /dev/null
+++ b/test/parallel-options.test.js
@@ -0,0 +1,204 @@
+import cacache from 'cacache';
+import findCacheDir from 'find-cache-dir';
+import { RawSource } from 'webpack-sources';
+import UglifyJsPlugin from '../src/index';
+import {
+  PluginEnvironment,
+  createCompiler,
+  compile,
+  cleanErrorStack,
+} from './helpers';
+
+const cachePath = findCacheDir({ name: 'uglifyjs-webpack-plugin' });
+
+cacache.rm.all(cachePath);
+
+describe('when options.parallel', () => {
+  let eventBindings;
+  let eventBinding;
+
+  beforeEach(() => {
+    const pluginEnvironment = new PluginEnvironment();
+    const compilerEnv = pluginEnvironment.getEnvironmentStub();
+    compilerEnv.context = '';
+
+    const plugin = new UglifyJsPlugin({
+      parallel: true,
+    });
+    plugin.apply(compilerEnv);
+    eventBindings = pluginEnvironment.getEventBindings();
+  });
+
+  it('binds one event handler', () => {
+    expect(eventBindings.length).toBe(1);
+  });
+
+  describe('compilation handler', () => {
+    beforeEach(() => {
+      [eventBinding] = eventBindings;
+    });
+
+    it('binds to compilation event', () => {
+      expect(eventBinding.name).toBe('compilation');
+    });
+
+    describe('when called', () => {
+      let chunkPluginEnvironment;
+      let compilationEventBindings;
+      let compilationEventBinding;
+      let compilation;
+      let callback;
+
+      beforeEach(() => {
+        chunkPluginEnvironment = new PluginEnvironment();
+        compilation = chunkPluginEnvironment.getEnvironmentStub();
+        compilation.assets = {
+          'test.js': {},
+          'test1.js': '',
+          'test2.js': {
+            source: () => 'invalid javascript',
+          },
+          'test3.js': {
+            source: () => '/** @preserve Foo Bar */ function foo(longVariableName) { longVariableName = 1; }',
+          },
+        };
+        compilation.errors = [];
+
+        eventBinding.handler(compilation);
+        compilationEventBindings = chunkPluginEnvironment.getEventBindings();
+      });
+
+      it('binds one event handler', () => {
+        expect(compilationEventBindings.length).toBe(1);
+      });
+
+      describe('optimize-chunk-assets handler', () => {
+        beforeEach(() => {
+          [compilationEventBinding] = compilationEventBindings;
+        });
+
+        it('binds to optimize-chunk-assets event', () => {
+          expect(compilationEventBinding.name).toEqual('optimize-chunk-assets');
+        });
+
+        it('only calls callback once', (done) => {
+          callback = jest.fn();
+          compilationEventBinding.handler([''], () => {
+            callback();
+            expect(callback.mock.calls.length).toBe(1);
+            done();
+          });
+        });
+
+        it('default only parses filenames ending with .js', (done) => {
+          compilationEventBinding.handler([{
+            files: ['test', 'test.js'],
+          }], () => {
+            expect(Object.keys(compilation.assets).length).toBe(4);
+            done();
+          });
+        });
+
+        it('early returns if private property is already set', (done) => {
+          compilationEventBinding.handler([{
+            files: ['test.js'],
+          }], () => {
+            expect(compilation.assets['test.js']).toEqual({});
+            done();
+          });
+        });
+
+        it('outputs stack trace errors for invalid asset', (done) => {
+          compilationEventBinding.handler([{
+            files: ['test1.js'],
+          }], () => {
+            expect(compilation.errors.length).toBe(1);
+            expect(compilation.errors[0]).toBeInstanceOf(Error);
+            expect(compilation.errors[0].message).toEqual(expect.stringContaining('asset.source is not a function'));
+            done();
+          });
+        });
+
+        it('outputs parsing errors for invalid javascript', (done) => {
+          compilationEventBinding.handler([{
+            files: ['test2.js'],
+          }], () => {
+            expect(compilation.errors.length).toBe(1);
+            expect(compilation.errors[0]).toBeInstanceOf(Error);
+            expect(compilation.errors[0].message).toEqual(expect.stringContaining('Unexpected token'));
+            expect(compilation.errors[0].message).toEqual(expect.stringContaining('[test2.js:1,8]'));
+            done();
+          });
+        });
+
+        it('outputs no errors for valid javascript', (done) => {
+          compilationEventBinding.handler([{
+            files: ['test3.js'],
+          }], () => {
+            expect(compilation.errors.length).toBe(0);
+            done();
+          });
+        });
+
+        it('outputs RawSource for valid javascript', (done) => {
+          compilationEventBinding.handler([{
+            files: ['test3.js'],
+          }], () => {
+            expect(compilation.assets['test3.js']).toBeInstanceOf(RawSource);
+            done();
+          });
+        });
+
+        it('outputs mangled javascript', (done) => {
+          compilationEventBinding.handler([{
+            files: ['test3.js'],
+          }], () => {
+            // eslint-disable-next-line no-underscore-dangle
+            expect(compilation.assets['test3.js']._value)
+              .not.toEqual(expect.stringContaining('longVariableName'));
+            done();
+          });
+        });
+
+        it('compresses and does not output beautified javascript', (done) => {
+          compilationEventBinding.handler([{
+            files: ['test3.js'],
+          }], () => {
+            // eslint-disable-next-line no-underscore-dangle
+            expect(compilation.assets['test3.js']._value).not.toEqual(expect.stringContaining('\n'));
+            done();
+          });
+        });
+
+        it('preserves comments', (done) => {
+          compilationEventBinding.handler([{
+            files: ['test3.js'],
+          }], () => {
+            // eslint-disable-next-line no-underscore-dangle
+            expect(compilation.assets['test3.js']._value).toEqual(expect.stringContaining('/**'));
+            done();
+          });
+        });
+      });
+    });
+  });
+
+  it('matches snapshot', () => {
+    const compiler = createCompiler();
+    new UglifyJsPlugin({ parallel: true }).apply(compiler);
+
+    return compile(compiler).then((stats) => {
+      const errors = stats.compilation.errors.map(cleanErrorStack);
+      const warnings = stats.compilation.warnings.map(cleanErrorStack);
+
+      expect(errors).toMatchSnapshot('errors');
+      expect(warnings).toMatchSnapshot('warnings');
+
+      for (const file in stats.compilation.assets) {
+        if (Object.prototype.hasOwnProperty.call(stats.compilation.assets, file)) {
+          expect(stats.compilation.assets[file].source()).toMatchSnapshot(file);
+        }
+      }
+    });
+  });
+});
diff --git a/test/uglify/__snapshots__/worker.test.js.snap b/test/uglify/__snapshots__/worker.test.js.snap
new file mode 100644
index 00000000..6f064f11
--- /dev/null
+++ b/test/uglify/__snapshots__/worker.test.js.snap
@@ -0,0 +1,61 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`test1.js 1`] = `
+Object {
+  "code": "var foo=1;",
+  "error": undefined,
+  "extractedComments": Array [],
+  "map": undefined,
+  "warnings": undefined,
+}
+`;
+
+exports[`test2.js 1`] = `
+Object {
+  "code": "var foo=1;",
+  "error": undefined,
+  "extractedComments": Array [],
+  "map": undefined,
+  "warnings": undefined,
+}
+`;
+
+exports[`test3.js 1`] = `
+Object {
+  "code": "var foo=1;",
+  "error": undefined,
+  "extractedComments": Array [],
+  "map": undefined,
+  "warnings": undefined,
+}
+`;
+
+exports[`test4.js 1`] = `
+Object {
+  "code": "var foo=1;",
+  "error": undefined,
+  "extractedComments": Array [],
+  "map": undefined,
+  "warnings": undefined,
+}
+`;
+
+exports[`test5.js 1`] = `
+Object {
+  "code": "/******/function hello(o){console.log(o)}",
+  "error": undefined,
+  "extractedComments": Array [],
+  "map": undefined,
+  "warnings": undefined,
+}
+`;
+
+exports[`test6.js 1`] = `
+Object {
+  "code": "function foo(f){if(f)return bar()}",
+  "error": undefined,
+  "extractedComments": Array [],
+  "map": "{\\"version\\":3,\\"sources\\":[\\"test1.js\\"],\\"names\\":[\\"foo\\",\\"x\\",\\"not_called1\\"],\\"mappings\\":\\"AAAA,SAASA,IAAIC,GACT,GACIA,EAAA,OACAC\\"}",
+  "warnings": undefined,
+}
+`;
diff --git a/test/uglify/cache.test.js b/test/uglify/cache.test.js
new file mode 100644
index 00000000..f0242040
--- /dev/null
+++ b/test/uglify/cache.test.js
@@ -0,0 +1,30 @@
+import crypto from 'crypto';
+import findCacheDir from 'find-cache-dir';
+import { get, put } from '../../src/uglify/cache';
+
+const hashAlgorithm = 'sha512';
+const getHash = data => `${hashAlgorithm}-${
+  crypto.createHash(hashAlgorithm).update(data).digest('base64')
+}`;
+
+const cacheDirectory = findCacheDir({
+  name: 'uglify-webpack-plugin-test',
+});
+
+const data = {
+  file: 'test/content.js',
+  input: '"hello uglifyjs"',
+};
+
+describe('when cache', () => {
+  beforeEach(() => put(cacheDirectory, data.file, data.input, getHash(data.input)));
+  it('get cache', () => get(cacheDirectory, data.file, getHash(data.input)).then((input) => {
+    expect(data.input).toEqual(input);
+  }));
+  it('the cache has expired', () => {
+    data.input = 'hello world';
+    return get(cacheDirectory, data.file, getHash(data.input)).then(() => Promise.reject(new Error('cache verification failed')), (error) => {
+      expect(error.message).toEqual('The cache has expired');
+    });
+  });
+});
diff --git a/test/uglify/serialization.test.js b/test/uglify/serialization.test.js
new file mode 100644
index 00000000..032a11de
--- /dev/null
+++ b/test/uglify/serialization.test.js
@@ -0,0 +1,35 @@
+import { encode, decode } from '../../src/uglify/serialization';
+
+describe('serialization data', () => {
+  it('serialization function', () => {
+    const input = {
+      func: (a, b) => a + b,
+    };
+    const string = JSON.stringify(input, encode);
+    const json = JSON.parse(string, decode);
+    expect(json.func).not.toBe(input.func);
+    expect(typeof json.func).toBe('function');
+    expect(json.func(1, 2)).toBe(input.func(1, 2));
+  });
+
+  it('serialization regexp', () => {
+    const input = {
+      regexp: /\s+/,
+    };
+    const string = JSON.stringify(input, encode);
+    const json = JSON.parse(string, decode);
+    expect(json.regexp).not.toBe(input.regexp);
+    expect(json.regexp instanceof RegExp).toBe(true);
+    expect(json.regexp.toString()).toBe(input.regexp.toString());
+  });
+
+  it('function operation failure should report critical information.', () => {
+    const a = 0;
+    const b = 1;
+    const input = {
+      func: () => a + b,
+    };
+    const string = JSON.stringify(input, encode);
+    expect(() => (JSON.parse(string, decode)).func()).toThrow('the option "func" performs an error in the child process:');
+  });
+});
diff --git a/test/uglify/worker.test.js b/test/uglify/worker.test.js
new file mode 100644
index 00000000..1bd807e6
--- /dev/null
+++ b/test/uglify/worker.test.js
@@ -0,0 +1,124 @@
+import worker from '../../src/uglify/worker';
+import { encode } from '../../src/uglify/serialization';
+
+describe('matches snapshot', () => {
+  it('normalizes when options.extractComments is regex', () => {
+    const options = {
+      file: 'test1.js',
+      input: 'var foo = 1;/* hello */',
+      uglifyOptions: {
+        output: {
+          comments: false,
+        },
+      },
+      extractComments: /foo/,
+    };
+    worker(JSON.stringify(options, encode), (error, data) => {
+      if (error) {
+        throw error;
+      }
+      expect(data).toMatchSnapshot(options.file);
+    });
+  });
+
+  it('normalizes when uglifyOptions.output.comments is string: all', () => {
+    const options = {
+      file: 'test2.js',
+      input: 'var foo = 1;/* hello */',
+      uglifyOptions: {
+        output: {
+          comments: 'all',
+        },
+      },
+    };
+    worker(JSON.stringify(options, encode), (error, data) => {
+      if (error) {
+        throw error;
+      }
+      expect(data).toMatchSnapshot(options.file);
+    });
+  });
+
+  it('normalizes when uglifyOptions.output.comments is string: some', () => {
+    const options = {
+      file: 'test3.js',
+      input: 'var foo = 1;/* hello */',
+      uglifyOptions: {
+        output: {
+          comments: 'some',
+        },
+      },
+    };
+    worker(JSON.stringify(options, encode), (error, data) => {
+      if (error) {
+        throw error;
+      }
+      expect(data).toMatchSnapshot(options.file);
+    });
+  });
+
+  it('normalizes when uglifyOptions.extractComments is number', () => {
+    const options = {
+      file: 'test4.js',
+      input: 'var foo = 1;/* hello */',
+      uglifyOptions: {
+        output: {
+          comments: 'some',
+        },
+      },
+      extractComments: 1,
+    };
+    worker(JSON.stringify(options, encode), (error, data) => {
+      if (error) {
+        throw error;
+      }
+      expect(data).toMatchSnapshot(options.file);
+    });
+  });
+
+  it('when applied with extract option set to a single file', () => {
+    const options = {
+      file: 'test5.js',
+      input: '/******/ function hello(a) {console.log(a)}',
+      uglifyOptions: {
+        output: {
+          comments: 'all',
+        },
+      },
+      extractComments: {
+        condition: 'should be extracted',
+        filename(file) {
+          return file.replace(/(\.\w+)$/, '.license$1');
+        },
+        banner(licenseFile) {
+          return `License information can be found in ${licenseFile}`;
+        },
+      },
+    };
+    worker(JSON.stringify(options, encode), (error, data) => {
+      if (error) {
+        throw error;
+      }
+      expect(data).toMatchSnapshot(options.file);
+    });
+  });
+
+  it('when options.inputSourceMap', () => {
+    const options = {
+      file: 'test6.js',
+      input: 'function foo(x) { if (x) { return bar(); not_called1(); } }',
+      inputSourceMap: {
+        version: 3,
+        sources: ['test1.js'],
+        names: ['foo', 'x', 'bar', 'not_called1'],
+        mappings: 'AAAA,QAASA,KAAIC,GACT,GAAIA,EAAG,CACH,MAAOC,MACPC',
+      },
+    };
+    worker(JSON.stringify(options, encode), (error, data) => {
+      if (error) {
+        throw error;
+      }
+      expect(data).toMatchSnapshot(options.file);
+    });
+  });
+});