diff --git a/docs/config-files.md b/docs/config-files.md
new file mode 100644
index 00000000..d4e15dc4
--- /dev/null
+++ b/docs/config-files.md
@@ -0,0 +1,56 @@
+# Clasp configuration files
+
+A Clasp project uses the following configuration files:
+
+File | Default | Description
+--- | --- | ---
+Clasp project file | `./.clasp.json` | Define which Apps Script project to interact with (and how)
+Clasp ignore file | `.claspignore` in the same directory as the Clasp project file | Specifies files to ignore by `push` and `watch` Clasp commands
+Google Auth file | `~/.clasprc.json` (global) or `.clasprc.json` in the same directory as the Clasp project file (local) | OAuth 2.0 authentication and authorization to access Google APIs. Authentication is global by default.
+Apps Script project manifest | `<rootDir>/appsscript.json` | Specifies basic project information (cf. [Manifests](https://developers.google.com/apps-script/concepts/manifests))
+Typescript configuration file | `<rootDir>/tsconfig.json` | Used for user specific compiling options. Limited support.
+
+## Environment variables
+
+Environment variables can be set in order to set the following default files:
+
+File | Environment varaiable | Comment
+--- | --- | ---
+Clasp project file | `clasp_config_project` | The filename must start with a dot '.'
+Clasp ignore file | `clasp_config_ignore` |
+Google Auth file | `clasp_config_auth` | The filename must start with a dot '.'
+
+## Command line options
+
+Command line options can be used in order to set the following default files:
+
+File | Environment varaiable | Comment
+--- | --- | ---
+Clasp project file | `-P <path>` or `--project <path>` | The filename must start with a dot '.'
+Clasp ignore file | `-I <path>` or `--ignore <path>` |
+Google Auth file | `-A <path>` or `--auth <path>` | The filename must start with a dot '.'
+
+> Note: command line options have precedence over environment variables
+
+## Usage of configuration files per command
+
+Command | Project file | ignore file | Auth file | Manifest file
+--- | --- | --- | --- | ---
+login | | | Write (`--creds` option) |
+logout | | | Delete |
+create | Write | | Read | Write
+clone | Write | | Read | Write
+pull | Read | | Read | Write
+push | Read | Read | Read | Read
+status | Read | Read | | Read
+open | Read | | Read | ???
+deployments | Read | | Read | ???
+deploy | Read | | Read | Read
+undeploy | Read | | Read | ???
+version | Read | | Read | ???
+versions | Read | | Read | ???
+list | | | Read |
+logs | ??? | | Read | ???
+run | Read | | Read | ???
+apis | ??? | | Read | ???
+setting | Read | | ??? | ???
diff --git a/package-lock.json b/package-lock.json
index 0fe92ab1..4efca528 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -136,9 +136,9 @@
       }
     },
     "@types/chai": {
-      "version": "4.1.7",
-      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.1.7.tgz",
-      "integrity": "sha512-2Y8uPt0/jwjhQ6EiluT0XCri1Dbplr0ZxfFXUz+ye13gaqE8u5gL5ppao1JrUYr9cIip5S6MvQzBS7Kke7U9VA==",
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.2.0.tgz",
+      "integrity": "sha512-zw8UvoBEImn392tLjxoavuonblX/4Yb9ha4KBU10FirCfwgzhKO0dvyJSF9ByxV1xK1r2AgnAi/tvQaLgxQqxA==",
       "dev": true
     },
     "@types/cli-spinner": {
@@ -150,12 +150,6 @@
         "@types/node": "*"
       }
     },
-    "@types/events": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/@types/events/-/events-3.0.0.tgz",
-      "integrity": "sha512-EaObqwIvayI5a8dCzhFrjKzVwKLxjoG9T6Ppd5CEo07LRKfQ8Yokw54r5+Wq7FaBQ+yXRvQAYPrHwya1/UFt9g==",
-      "dev": true
-    },
     "@types/fs-extra": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/@types/fs-extra/-/fs-extra-8.0.0.tgz",
@@ -165,23 +159,6 @@
         "@types/node": "*"
       }
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-      "version": "7.1.1",
-      "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.1.tgz",
-      "integrity": "sha512-1Bh06cbWJUHMC97acuD6UMG29nMt0Aqz1vF3guLfG+kHHJhy3AyohZFFxYk2f7Q1SQIrNwvncxAE0N/9s70F2w==",
-      "requires": {
-        "@types/events": "*",
-        "@types/minimatch": "*",
-        "@types/node": "*"
-      },
-      "dependencies": {
-        "@types/node": {
-          "version": "12.7.0",
-          "resolved": "https://registry.npmjs.org/@types/node/-/node-12.7.0.tgz",
-          "integrity": "sha512-vqcj1MVm2Sla4PpMfYKh1MyDN4D2f/mPIZD7RdAGqEsbE+JxfeqQHHVbRDQ0Nqn8i73gJa1HQ1Pu3+nH4Q0Yiw=="
-        }
-      }
-    },
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       "version": "6.5.0",
       "resolved": "https://registry.npmjs.org/@types/inquirer/-/inquirer-6.5.0.tgz",
@@ -213,9 +190,9 @@
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-      "resolved": "https://registry.npmjs.org/@types/node/-/node-10.14.14.tgz",
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+      "version": "10.14.16",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-10.14.16.tgz",
+      "integrity": "sha512-/opXIbfn0P+VLt+N8DE4l8Mn8rbhiJgabU96ZJ0p9mxOkIks5gh6RUnpHak7Yh0SFkyjO/ODbxsQQPV2bpMmyA==",
       "dev": true
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@@ -308,7 +285,8 @@
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-      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg="
+      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+      "dev": true
     },
     "ansi-styles": {
       "version": "3.2.1",
@@ -570,11 +548,11 @@
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     },
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-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-2.1.0.tgz",
-      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
+      "integrity": "sha512-I/zHAwsKf9FqGoXM4WWRACob9+SNukZTd94DWF57E4toouRulbCxcUh6RKUEOQlYTHJnzkPMySvPNaaSLNfLZw==",
       "requires": {
-        "restore-cursor": "^2.0.0"
+        "restore-cursor": "^3.1.0"
       }
     },
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@@ -646,9 +624,9 @@
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-      "version": "2.20.0",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.0.tgz",
-      "integrity": "sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ=="
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-3.0.0.tgz",
+      "integrity": "sha512-pl3QrGOBa9RZaslQiqnnKX2J068wcQw7j9AIaBQ9/JEp5RY6je4jKTImg0Bd+rpoONSe7GUFSgkxLeo17m3Pow=="
     },
     "commondir": {
       "version": "1.0.1",
@@ -700,7 +678,7 @@
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         "minimist": {
           "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
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@@ -1045,19 +1023,6 @@
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-        "dir-glob": "^3.0.1",
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-        "glob": "^7.1.3",
-        "ignore": "^5.1.1",
-        "merge2": "^1.2.3",
-        "slash": "^3.0.0"
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     "google-auth-library": {
-      "version": "4.2.6",
-      "resolved": "https://registry.npmjs.org/google-auth-library/-/google-auth-library-4.2.6.tgz",
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+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/google-auth-library/-/google-auth-library-5.2.0.tgz",
+      "integrity": "sha512-I2726rgOedQ06HgTvoNvBeRCzy5iFe6z3khwj6ugfRd1b0VHwnTYKl/3t2ytOTo7kKc6KivYIBsCIdZf2ep67g==",
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         "fast-text-encoding": "^1.0.0",
         "gaxios": "^2.0.0",
         "gcp-metadata": "^2.0.0",
-        "gtoken": "^3.0.0",
+        "gtoken": "^4.0.0",
         "jws": "^3.1.5",
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@@ -1381,22 +1331,22 @@
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+      "resolved": "https://registry.npmjs.org/googleapis/-/googleapis-42.0.0.tgz",
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       "requires": {
-        "google-auth-library": "^4.0.0",
-        "googleapis-common": "^2.0.2"
+        "google-auth-library": "^5.1.0",
+        "googleapis-common": "^3.0.0"
       }
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-      "resolved": "https://registry.npmjs.org/googleapis-common/-/googleapis-common-2.0.4.tgz",
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+      "resolved": "https://registry.npmjs.org/googleapis-common/-/googleapis-common-3.1.0.tgz",
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       "requires": {
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         "gaxios": "^2.0.1",
-        "google-auth-library": "^4.2.5",
+        "google-auth-library": "^5.2.0",
         "qs": "^6.7.0",
         "url-template": "^2.0.8",
         "uuid": "^3.3.2"
@@ -1432,9 +1382,9 @@
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+      "resolved": "https://registry.npmjs.org/gtoken/-/gtoken-4.0.0.tgz",
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-        "ansi-escapes": "^3.2.0",
+        "ansi-escapes": "^4.2.1",
         "chalk": "^2.4.2",
-        "cli-cursor": "^2.1.0",
+        "cli-cursor": "^3.1.0",
         "cli-width": "^2.0.0",
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-        "figures": "^2.0.0",
-        "lodash": "^4.17.12",
-        "mute-stream": "0.0.7",
+        "figures": "^3.0.0",
+        "lodash": "^4.17.15",
+        "mute-stream": "0.0.8",
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+        "is-fullwidth-code-point": {
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+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
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+          "requires": {
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^5.2.0"
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+        "type-fest": {
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+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.5.2.tgz",
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+        }
       }
     },
     "inquirer-autocomplete-prompt": {
@@ -1687,7 +1680,8 @@
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-      "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8="
+      "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+      "dev": true
     },
     "is-ip": {
       "version": "3.1.0",
@@ -1708,27 +1702,6 @@
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@@ -2164,20 +2137,6 @@
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-    },
     "mime": {
       "version": "2.4.4",
       "resolved": "https://registry.npmjs.org/mime/-/mime-2.4.4.tgz",
@@ -2199,9 +2158,9 @@
       }
     },
     "mimic-fn": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/mimic-fn/-/mimic-fn-1.2.0.tgz",
-      "integrity": "sha512-jf84uxzwiuiIVKiOLpfYk7N46TSy8ubTonmneY9vrpHNAnp0QBt2BxWV9dO3/j+BoVAb+a5G6YDPW3M5HOdMWQ=="
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/mimic-fn/-/mimic-fn-2.1.0.tgz",
+      "integrity": "sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg=="
     },
     "mimic-response": {
       "version": "1.0.1",
@@ -2218,12 +2177,12 @@
     },
     "minimist": {
       "version": "0.0.8",
-      "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
       "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0="
     },
     "mkdirp": {
       "version": "0.5.1",
-      "resolved": "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
       "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
       "requires": {
         "minimist": "0.0.8"
@@ -2343,9 +2302,9 @@
       }
     },
     "mute-stream": {
-      "version": "0.0.7",
-      "resolved": "https://registry.npmjs.org/mute-stream/-/mute-stream-0.0.7.tgz",
-      "integrity": "sha1-MHXOk7whuPq0PhvE2n6BFe0ee6s="
+      "version": "0.0.8",
+      "resolved": "https://registry.npmjs.org/mute-stream/-/mute-stream-0.0.8.tgz",
+      "integrity": "sha512-nnbWWOkoWyUsTjKrhgD0dcz22mdkSnpYqbEjIm2nhwhuxlSkpywJmBo8h0ZqJdkp73mb90SssHkN4rsRaBAfAA=="
     },
     "neo-async": {
       "version": "2.6.1",
@@ -2533,11 +2492,11 @@
       }
     },
     "onetime": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/onetime/-/onetime-2.0.1.tgz",
-      "integrity": "sha1-BnQoIw/WdEOyeUsiu6UotoZ5YtQ=",
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/onetime/-/onetime-5.1.0.tgz",
+      "integrity": "sha512-5NcSkPHhwTVFIQN+TUqXoS5+dlElHXdpAWu9I0HP20YOtIi+aZ0Ct82jdlILDxjLEAWwvm+qj1m6aEtsDVmm6Q==",
       "requires": {
-        "mimic-fn": "^1.0.0"
+        "mimic-fn": "^2.1.0"
       }
     },
     "open": {
@@ -2560,7 +2519,7 @@
     },
     "os-homedir": {
       "version": "1.0.2",
-      "resolved": "http://registry.npmjs.org/os-homedir/-/os-homedir-1.0.2.tgz",
+      "resolved": "https://registry.npmjs.org/os-homedir/-/os-homedir-1.0.2.tgz",
       "integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M="
     },
     "os-locale": {
@@ -2690,15 +2649,6 @@
       "resolved": "https://registry.npmjs.org/parse-passwd/-/parse-passwd-1.0.0.tgz",
       "integrity": "sha1-bVuTSkVpk7I9N/QKOC1vFmao5cY="
     },
-    "path": {
-      "version": "0.12.7",
-      "resolved": "https://registry.npmjs.org/path/-/path-0.12.7.tgz",
-      "integrity": "sha1-1NwqUGxM4hl+tIHr/NWzbAFAsQ8=",
-      "requires": {
-        "process": "^0.11.1",
-        "util": "^0.10.3"
-      }
-    },
     "path-exists": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-4.0.0.tgz",
@@ -2799,11 +2749,6 @@
       "integrity": "sha512-OeHeMc0JhFE9idD4ZdtNibzY0+TPHSpSSb9h8FqtP+YnoZZ1sl8Vc9b1sasjfymH3SonAF4QcA2+mzHPhMvIiw==",
       "dev": true
     },
-    "process": {
-      "version": "0.11.10",
-      "resolved": "https://registry.npmjs.org/process/-/process-0.11.10.tgz",
-      "integrity": "sha1-czIwDoQBYb2j5podHZGn1LwW8YI="
-    },
     "pseudomap": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/pseudomap/-/pseudomap-1.0.2.tgz",
@@ -2842,9 +2787,9 @@
       "dev": true
     },
     "qs": {
-      "version": "6.7.0",
-      "resolved": "https://registry.npmjs.org/qs/-/qs-6.7.0.tgz",
-      "integrity": "sha512-VCdBRNFTX1fyE7Nb6FYoURo/SPe62QCaAyzJvUjwRaIsc+NePBEniHlvxFmmX56+HZphIGtV0XeCirBtpDrTyQ=="
+      "version": "6.8.0",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.8.0.tgz",
+      "integrity": "sha512-tPSkj8y92PfZVbinY1n84i1Qdx75lZjMQYx9WZhnkofyxzw2r7Ho39G3/aEvSUdebxpnnM4LZJCtvE/Aq3+s9w=="
     },
     "read-pkg": {
       "version": "3.0.0",
@@ -3050,11 +2995,11 @@
       }
     },
     "restore-cursor": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-2.0.0.tgz",
-      "integrity": "sha1-n37ih/gv0ybU/RYpI9YhKe7g368=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-3.1.0.tgz",
+      "integrity": "sha512-l+sSefzHpj5qimhFSE5a8nufZYAM3sBSVMAPtYkmC+4EH2anSGaEMXSD0izRQbu9nfyQ9y5JrVmp7E8oZrUjvA==",
       "requires": {
-        "onetime": "^2.0.0",
+        "onetime": "^5.1.0",
         "signal-exit": "^3.0.2"
       }
     },
@@ -3245,6 +3190,7 @@
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
       "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+      "dev": true,
       "requires": {
         "is-fullwidth-code-point": "^2.0.0",
         "strip-ansi": "^4.0.0"
@@ -3254,6 +3200,7 @@
           "version": "4.0.0",
           "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
           "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "dev": true,
           "requires": {
             "ansi-regex": "^3.0.0"
           }
@@ -3414,9 +3361,9 @@
       "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ=="
     },
     "tslint": {
-      "version": "5.18.0",
-      "resolved": "https://registry.npmjs.org/tslint/-/tslint-5.18.0.tgz",
-      "integrity": "sha512-Q3kXkuDEijQ37nXZZLKErssQVnwCV/+23gFEMROi8IlbaBG6tXqLPQJ5Wjcyt/yHPKBC+hD5SzuGaMora+ZS6w==",
+      "version": "5.19.0",
+      "resolved": "https://registry.npmjs.org/tslint/-/tslint-5.19.0.tgz",
+      "integrity": "sha512-1LwwtBxfRJZnUvoS9c0uj8XQtAnyhWr9KlNvDIdB+oXyT+VpsOAaEhEgKi1HrZ8rq0ki/AAnbGSv4KM6/AfVZw==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
@@ -3432,6 +3379,14 @@
         "semver": "^5.3.0",
         "tslib": "^1.8.0",
         "tsutils": "^2.29.0"
+      },
+      "dependencies": {
+        "commander": {
+          "version": "2.20.0",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.0.tgz",
+          "integrity": "sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==",
+          "dev": true
+        }
       }
     },
     "tsutils": {
@@ -3485,6 +3440,13 @@
         "source-map": "~0.6.1"
       },
       "dependencies": {
+        "commander": {
+          "version": "2.20.0",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.0.tgz",
+          "integrity": "sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==",
+          "dev": true,
+          "optional": true
+        },
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -3521,21 +3483,6 @@
       "resolved": "https://registry.npmjs.org/url-template/-/url-template-2.0.8.tgz",
       "integrity": "sha1-/FZaPMy/93MMd19WQflVV5FDnyE="
     },
-    "util": {
-      "version": "0.10.4",
-      "resolved": "https://registry.npmjs.org/util/-/util-0.10.4.tgz",
-      "integrity": "sha512-0Pm9hTQ3se5ll1XihRic3FDIku70C+iHUdT/W926rSgHV5QgXsYbKZN8MSC3tJtSkhuROzvsQjAaFENRXr+19A==",
-      "requires": {
-        "inherits": "2.0.3"
-      },
-      "dependencies": {
-        "inherits": {
-          "version": "2.0.3",
-          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
-          "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
-        }
-      }
-    },
     "uuid": {
       "version": "3.3.2",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
@@ -3573,7 +3520,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ="
         }
       }
diff --git a/package.json b/package.json
index 54017d54..575b9ab6 100644
--- a/package.json
+++ b/package.json
@@ -58,23 +58,22 @@
   "dependencies": {
     "chalk": "^2.4.2",
     "cli-spinner": "^0.2.10",
-    "commander": "^2.20.0",
+    "commander": "^3.0.0",
     "dotf": "^1.2.0",
     "ellipsize": "^0.1.0",
     "find-up": "^4.1.0",
     "fs-extra": "^8.1.0",
     "fuzzy": "^0.1.3",
     "gaxios": "^2.0.1",
-    "google-auth-library": "^4.2.5",
-    "googleapis": "^41.0.1",
-    "inquirer": "^6.5.0",
+    "google-auth-library": "^5.2.0",
+    "googleapis": "^42.0.0",
+    "inquirer": "^6.5.1",
     "inquirer-autocomplete-prompt": "1.0.1",
     "is-online": "^8.2.0",
     "mkdirp": "^0.5.1",
     "multimatch": "^4.0.0",
     "normalize-newline": "3.0.0",
     "open": "^6.4.0",
-    "path": "^0.12.7",
     "pluralize": "^8.0.0",
     "recursive-readdir": "^2.2.2",
     "split-lines": "^2.0.0",
@@ -85,26 +84,25 @@
     "watch": "^1.0.2"
   },
   "devDependencies": {
-    "@types/chai": "^4.1.7",
+    "@types/chai": "^4.2.0",
     "@types/cli-spinner": "^0.2.0",
-    "@types/events": "^3.0.0",
     "@types/fs-extra": "^8.0.0",
-    "@types/inquirer": "^6.0.3",
+    "@types/inquirer": "^6.5.0",
     "@types/mkdirp": "^0.5.2",
     "@types/mocha": "^5.2.7",
-    "@types/node": "^10.14.13",
+    "@types/node": "^10.14.16",
     "@types/pluralize": "^0.0.29",
     "@types/recursive-readdir": "^2.2.0",
     "@types/tmp": "^0.1.0",
     "@types/watch": "^1.0.1",
     "axios": "^0.19.0",
     "chai": "^4.2.0",
-    "coveralls": "^3.0.5",
+    "coveralls": "^3.0.6",
     "mocha": "^6.2.0",
     "nyc": "^14.1.1",
     "prettier": "^1.18.2",
     "tmp": "^0.1.0",
     "ts-node": "^8.3.0",
-    "tslint": "^5.18.0"
+    "tslint": "^5.19.0"
   }
 }
diff --git a/src/auth.ts b/src/auth.ts
index 5a4e40f3..0406ed3d 100644
--- a/src/auth.ts
+++ b/src/auth.ts
@@ -9,7 +9,7 @@ import url from 'url';
 import { Credentials, GenerateAuthUrlOpts, OAuth2Client, OAuth2ClientOptions } from 'google-auth-library';
 import { google, script_v1 } from 'googleapis';
 import open from 'open';
-import { ClaspToken, DOTFILE, Dotfile } from './dotfile';
+import { ClaspToken, DOTFILE } from './dotfile';
 import { oauthScopesPrompt } from './inquirer';
 import { readManifest } from './manifest';
 import { ClaspCredentials, ERROR, LOG, checkIfOnline, getOAuthSettings, logError } from './utils';
@@ -159,9 +159,8 @@ export async function authorize(options: {
 
     // Save the token and own creds together.
     let claspToken: ClaspToken;
-    let dotfile: Dotfile;
+    // TODO: deprecate `--creds` option
     if (options.creds) {
-      dotfile = DOTFILE.RC_LOCAL();
       // Save local ClaspCredentials.
       claspToken = {
         token,
@@ -173,7 +172,6 @@ export async function authorize(options: {
         isLocalCreds: true,
       };
     } else {
-      dotfile = DOTFILE.RC;
       // Save global ClaspCredentials.
       claspToken = {
         token,
@@ -181,7 +179,7 @@ export async function authorize(options: {
         isLocalCreds: false,
       };
     }
-    await dotfile.write(claspToken);
+    await DOTFILE.AUTH().write(claspToken);
     console.log(LOG.SAVED_CREDS(!!options.creds));
   } catch (err) {
     logError(null, ERROR.ACCESS_TOKEN + err);
@@ -318,7 +316,7 @@ async function setOauthClientCredentials(rc: ClaspToken) {
     await refreshCredentials(globalOAuth2Client);
 
     // Save the credentials.
-    await (rc.isLocalCreds ? DOTFILE.RC_LOCAL() : DOTFILE.RC).write(rc);
+    await DOTFILE.AUTH().write(rc);
   } catch (err) {
     logError(null, ERROR.ACCESS_TOKEN + err);
   }
diff --git a/src/commands/apis.ts b/src/commands/apis.ts
index 327802da..476d42cc 100644
--- a/src/commands/apis.ts
+++ b/src/commands/apis.ts
@@ -7,6 +7,7 @@ import { URL } from '../urls';
 import { enableOrDisableAPI } from '../apiutils';
 import open from 'open';
 import { serviceusage_v1 } from 'googleapis';
+// TODO: drop padEnd polyfill with with NodeJs >= 8.2.1
 const padEnd = require('string.prototype.padend');
 
 /**
diff --git a/src/commands/clone.ts b/src/commands/clone.ts
index 9df0f599..fa07e9b2 100644
--- a/src/commands/clone.ts
+++ b/src/commands/clone.ts
@@ -1,11 +1,10 @@
-import { async } from 'rxjs/internal/scheduler/async';
 import { drive, loadAPICredentials } from '../auth';
 import { fetchProject, hasProject, writeProjectFiles } from '../files';
 import { ScriptIdPrompt, scriptIdPrompt } from '../inquirer';
 import { extractScriptId } from '../urls';
 import { ERROR, LOG, checkIfOnline, logError, saveProject, spinner } from '../utils';
 import status from './status';
-
+// TODO: drop padEnd polyfill with with NodeJs >= 8.2.1
 const padEnd = require('string.prototype.padend');
 
 /**
diff --git a/src/commands/deploy.ts b/src/commands/deploy.ts
index 91fad75e..e2a7b247 100644
--- a/src/commands/deploy.ts
+++ b/src/commands/deploy.ts
@@ -1,13 +1,6 @@
 import { loadAPICredentials, script } from '../auth';
-import {
-  ERROR,
-  LOG,
-  PROJECT_MANIFEST_BASENAME,
-  checkIfOnline,
-  getProjectSettings,
-  logError,
-  spinner,
-} from '../utils';
+import { PROJECT_MANIFEST_BASENAME } from '../conf';
+import { ERROR, LOG, checkIfOnline, getProjectSettings, logError, spinner } from '../utils';
 
 /**
  * Deploys an Apps Script project.
diff --git a/src/commands/list.ts b/src/commands/list.ts
index 998d157d..aefe42a2 100644
--- a/src/commands/list.ts
+++ b/src/commands/list.ts
@@ -9,6 +9,7 @@ interface EllipizeOptions {
   truncate?: boolean | 'middle';
 }
 const ellipsize: (str?: string, max?: number, opts?: EllipizeOptions) => string = require('ellipsize');
+// TODO: drop padEnd polyfill with with NodeJs >= 8.2.1
 const padEnd = require('string.prototype.padend');
 
 /**
diff --git a/src/commands/login.ts b/src/commands/login.ts
index b3822d73..d089f202 100644
--- a/src/commands/login.ts
+++ b/src/commands/login.ts
@@ -7,7 +7,6 @@ import { authorize, getLoggedInEmail } from '../auth';
 import { FS_OPTIONS } from '../files';
 import { readManifest } from '../manifest';
 import { ERROR, LOG, checkIfOnline, hasOauthClientSettings, safeIsOnline } from '../utils';
-import { google } from 'googleapis';
 
 /**
  * Logs the user in. Saves the client credentials to an either local or global rc file.
@@ -16,10 +15,10 @@ import { google } from 'googleapis';
  * @param {string?} options.creds The location of credentials file.
  * @param {boolean?} options.status If true, prints who is logged in instead of doing login.
  */
-export default async (options: { localhost?: boolean; creds?: string, status?: boolean }) => {
+export default async (options: { localhost?: boolean; creds?: string; status?: boolean }) => {
   if (options.status) {
     if (hasOauthClientSettings()) {
-      const email = (await safeIsOnline()) ? (await getLoggedInEmail()) : undefined;
+      const email = (await safeIsOnline()) ? await getLoggedInEmail() : undefined;
 
       if (!!email) {
         console.log(LOG.LOGGED_IN_AS(email));
@@ -77,22 +76,22 @@ export default async (options: { localhost?: boolean; creds?: string, status?: b
       await authorize({
         useLocalhost,
         scopes: [
-        // Use the default scopes needed for clasp.
-        'https://www.googleapis.com/auth/script.deployments', // Apps Script deployments
-        'https://www.googleapis.com/auth/script.projects', // Apps Script management
-        'https://www.googleapis.com/auth/script.webapp.deploy', // Apps Script Web Apps
-        'https://www.googleapis.com/auth/drive.metadata.readonly', // Drive metadata
-        'https://www.googleapis.com/auth/drive.file', // Create Drive files
-        'https://www.googleapis.com/auth/service.management', // Cloud Project Service Management API
-        'https://www.googleapis.com/auth/logging.read', // StackDriver logs
-        'https://www.googleapis.com/auth/userinfo.email', // User email address
-        'https://www.googleapis.com/auth/userinfo.profile',
+          // Use the default scopes needed for clasp.
+          'https://www.googleapis.com/auth/script.deployments', // Apps Script deployments
+          'https://www.googleapis.com/auth/script.projects', // Apps Script management
+          'https://www.googleapis.com/auth/script.webapp.deploy', // Apps Script Web Apps
+          'https://www.googleapis.com/auth/drive.metadata.readonly', // Drive metadata
+          'https://www.googleapis.com/auth/drive.file', // Create Drive files
+          'https://www.googleapis.com/auth/service.management', // Cloud Project Service Management API
+          'https://www.googleapis.com/auth/logging.read', // StackDriver logs
+          'https://www.googleapis.com/auth/userinfo.email', // User email address
+          'https://www.googleapis.com/auth/userinfo.profile',
 
-        // Extra scope since service.management doesn't work alone
-        'https://www.googleapis.com/auth/cloud-platform',
-      ],
-    });
-  }
-  process.exit(0); // gracefully exit after successful login
+          // Extra scope since service.management doesn't work alone
+          'https://www.googleapis.com/auth/cloud-platform',
+        ],
+      });
+    }
+    process.exit(0); // gracefully exit after successful login
   }
 };
diff --git a/src/commands/logout.ts b/src/commands/logout.ts
index 7ff546d7..e148eb4c 100644
--- a/src/commands/logout.ts
+++ b/src/commands/logout.ts
@@ -1,11 +1,39 @@
-import { DOT } from '../dotfile';
-import fs from 'fs-extra';
+import { Conf } from '../conf';
+import { DOTFILE } from '../dotfile';
 import { hasOauthClientSettings } from '../utils';
 
+const auth = Conf.get().auth;
+
 /**
  * Logs out the user by deleting credentials.
  */
-export default async () => {
-  if (hasOauthClientSettings(true)) fs.unlinkSync(DOT.RC.ABSOLUTE_LOCAL_PATH);
-  if (hasOauthClientSettings()) fs.unlinkSync(DOT.RC.ABSOLUTE_PATH);
+export default async () => {  let previousPath: string | undefined = undefined;
+  if (hasOauthClientSettings(true)) {
+    if (auth.isDefault()) {
+      // if no local auth defined, try current directory
+      previousPath = auth.path;
+      auth.path = '.';
+    }
+
+    await DOTFILE.AUTH().delete();
+
+    if (previousPath) {
+      auth.path = previousPath;
+    }
+  }
+
+  if (hasOauthClientSettings()) {
+    if (!auth.isDefault()) {
+      // if local auth defined, try with default (global)
+      previousPath = auth.path;
+      auth.path = '';
+    }
+
+    await DOTFILE.AUTH().delete();
+
+    if (previousPath) {
+      auth.path = previousPath;
+    }
+  }
+
 };
diff --git a/src/commands/logs.ts b/src/commands/logs.ts
index 21a85db7..793e761d 100644
--- a/src/commands/logs.ts
+++ b/src/commands/logs.ts
@@ -7,7 +7,7 @@ import { DOTFILE, ProjectSettings } from '../dotfile';
 import { projectIdPrompt } from '../inquirer';
 import { URL } from '../urls';
 import { ERROR, LOG, checkIfOnline, getProjectSettings, isValidProjectId, logError, spinner } from '../utils';
-
+// TODO: drop padEnd polyfill with with NodeJs >= 8.2.1
 const padEnd = require('string.prototype.padend');
 
 /**
diff --git a/src/commands/openCmd.ts b/src/commands/openCmd.ts
index 9f710286..d36c0930 100644
--- a/src/commands/openCmd.ts
+++ b/src/commands/openCmd.ts
@@ -2,7 +2,7 @@ import open from 'open';
 import { loadAPICredentials, script } from '../auth';
 import { deploymentIdPrompt } from '../inquirer';
 import { URL } from '../urls';
-import { ERROR, LOG, checkIfOnline, getProjectSettings, getWebApplicationURL, logError } from '../utils';
+import { ERROR, LOG, getProjectSettings, getWebApplicationURL, logError } from '../utils';
 
 interface EllipizeOptions {
   ellipse?: string;
@@ -10,6 +10,7 @@ interface EllipizeOptions {
   truncate?: boolean | 'middle';
 }
 const ellipsize: (str?: string, max?: number, opts?: EllipizeOptions) => string = require('ellipsize');
+// TODO: drop padEnd polyfill with with NodeJs >= 8.2.1
 const padEnd = require('string.prototype.padend');
 
 /**
diff --git a/src/commands/push.ts b/src/commands/push.ts
index 0eee02a9..532ff412 100644
--- a/src/commands/push.ts
+++ b/src/commands/push.ts
@@ -3,18 +3,14 @@ import { readFileSync } from 'fs-extra';
 import multimatch from 'multimatch';
 import { watchTree } from 'watch';
 import { loadAPICredentials } from '../auth';
-import { DOT, DOTFILE } from '../dotfile';
+import { Conf, PROJECT_MANIFEST_BASENAME, PROJECT_MANIFEST_FILENAME } from '../conf';
+import { DOTFILE } from '../dotfile';
 import { FS_OPTIONS, fetchProject, pushFiles } from '../files';
 import { overwritePrompt } from '../inquirer';
 import { isValidManifest } from '../manifest';
-import {
-  LOG,
-  PROJECT_MANIFEST_BASENAME,
-  PROJECT_MANIFEST_FILENAME,
-  checkIfOnline,
-  getProjectSettings,
-  spinner,
-} from '../utils';
+import { LOG, checkIfOnline, getProjectSettings, spinner } from '../utils';
+
+const project = Conf.get().project;
 
 const normalizeNewline = require('normalize-newline');
 
@@ -77,7 +73,7 @@ const confirmManifestUpdate = async (): Promise<boolean> => {
  */
 const manifestHasChanges = async (): Promise<boolean> => {
   const { scriptId, rootDir } = await getProjectSettings();
-  const localManifestPath = path.join(rootDir || DOT.PROJECT.DIR, PROJECT_MANIFEST_FILENAME);
+  const localManifestPath = path.join(rootDir || project.resolvedDir, PROJECT_MANIFEST_FILENAME);
   const localManifest = readFileSync(localManifestPath, FS_OPTIONS);
   const remoteFiles = await fetchProject(scriptId, undefined, true);
   const remoteManifest = remoteFiles.find(file => file.name === PROJECT_MANIFEST_BASENAME);
diff --git a/src/commands/run.ts b/src/commands/run.ts
index 33a6b74c..8f068dfc 100644
--- a/src/commands/run.ts
+++ b/src/commands/run.ts
@@ -50,6 +50,7 @@ export default async (functionName: string, cmd: { nondev: boolean; params: stri
  */
 async function runFunction(functionName: string, params: string[], scriptId: string, devMode: boolean) {
   try {
+    // TODO: @grant what are the issues/risks of not using local auth?
     // Load local credentials.
     await loadAPICredentials(true);
     const localScript = await getLocalScript();
diff --git a/src/conf.ts b/src/conf.ts
new file mode 100644
index 00000000..d1d65199
--- /dev/null
+++ b/src/conf.ts
@@ -0,0 +1,128 @@
+import os from 'os';
+import path from 'path';
+import { PathProxy } from './pathproxy';
+
+/**
+ * supported environment variables
+ */
+enum ENV {
+  DOT_CLASP_AUTH = 'clasp_config_auth',
+  DOT_CLASP_IGNORE = 'clasp_config_ignore',
+  DOT_CLASP_PROJECT = 'clasp_config_project',
+  // MANIFEST = 'clasp_config_manifest',
+  // TSCONFIG = 'clasp_config_tsconfig',
+}
+
+// Names / Paths
+/** Constant `clasp` */
+export const PROJECT_NAME = 'clasp';
+/** Constant `appsscript` */
+export const PROJECT_MANIFEST_BASENAME = 'appsscript';
+/** Constant `appsscript.json` */
+export const PROJECT_MANIFEST_FILENAME = `${PROJECT_MANIFEST_BASENAME}.json`;
+
+/**
+ * A Singleton class to hold configuration related objects.
+ * Use the `get()` method to access the unique singleton instance.
+ */
+export class Conf {
+  private static _instance: Conf;
+  /**
+   * This dotfile saves clasp project information, local to project directory.
+   */
+  readonly project: PathProxy;
+  /**
+   * This dotfile stores information about ignoring files on `push`. Like .gitignore.
+   */
+  readonly ignore: IgnoreFile;
+  /**
+   * This dotfile saves auth information. Should never be committed.
+   * There are 2 types: personal & global:
+   * - Global: In the $HOME directory.
+   * - Personal: In the local directory.
+   * @see {ClaspToken}
+   */
+  readonly auth: AuthFile;
+  // readonly manifest: PathProxy;
+
+  /**
+   * Private to prevent direct construction calls with the `new` operator.
+   */
+  private constructor() {
+
+    /**
+     * Helper to set the PathProxy path if an environment variables is set.
+     *
+     * *Note: Empty values (i.e. '') are not accounted for.*
+     */
+    const setPathWithEnvVar = (varName: string, file: PathProxy) => {
+      const envVar = process.env[varName];
+      if (envVar) {
+        file.path = envVar;
+      }
+    };
+
+    // default `project` path is `./.clasp.json`
+    this.project = new PathProxy({ dir: '.', base: `.${PROJECT_NAME}.json` });
+
+    // default `ignore` path is `~/.claspignore`
+    // IgnoreFile class implements custom `.resolve()` rules
+    this.ignore = new IgnoreFile({ dir: os.homedir(), base: `.${PROJECT_NAME}ignore` });
+
+    // default `auth` path is `~/.clasprc.json`
+    // Default Auth is global. Any other implies local auth
+    this.auth = new AuthFile({ dir: os.homedir(), base: `.${PROJECT_NAME}rc.json` });
+
+    // resolve environment variables
+    setPathWithEnvVar(ENV.DOT_CLASP_PROJECT, this.project);
+    setPathWithEnvVar(ENV.DOT_CLASP_IGNORE, this.ignore);
+    setPathWithEnvVar(ENV.DOT_CLASP_AUTH, this.auth);
+  }
+
+  /**
+   * The static method that controls the access to the Conf singleton instance.
+   *
+   * @returns {Conf}
+   */
+  static get(): Conf {
+    if (!Conf._instance) {
+      Conf._instance = new Conf();
+    }
+
+    return Conf._instance;
+  }
+}
+
+class AuthFile extends PathProxy {
+  /**
+   * Rules to resolves path:
+   *
+   * - if default path, use as is
+   * - otherwise use super.resolve()
+   *
+   * @returns {string}
+   */
+  resolve(): string {
+    return this.isDefault()
+      ? path.join(this._default.dir, this._default.base)
+      : super.resolve();
+  }
+}
+
+class IgnoreFile extends PathProxy {
+  /**
+   * Rules to resolves path:
+   *
+   * - if default, use the **project** directory and the default base filename
+   * - otherwise use super.resolve()
+   *
+   * @returns {string}
+   */
+  resolve(): string {
+    return this.isDefault()
+      ? path.join(Conf.get().project.resolvedDir, this._default.base)
+      : super.resolve();
+  }
+}
+
+// TODO: add more subclasses if necessary
diff --git a/src/dotfile.ts b/src/dotfile.ts
index a37c8019..cb7d6655 100644
--- a/src/dotfile.ts
+++ b/src/dotfile.ts
@@ -12,13 +12,17 @@
  * This should be the only file that uses DOTFILE.
  */
 
-import os from 'os';
 import path from 'path';
-import findUp from 'find-up';
 import fs from 'fs-extra';
 import { Credentials } from 'google-auth-library';
 import { OAuth2ClientOptions } from 'google-auth-library/build/src/auth/oauth2client';
-import stripBom = require('strip-bom');
+import stripBom from 'strip-bom';
+import { Conf } from './conf';
+
+const conf = Conf.get();
+const auth = conf.auth;
+const ignore = conf.ignore;
+const project = conf.project;
 
 // Getting ready to switch to `dotf` embedded types
 // import { default as dotf } from 'dotf';
@@ -37,10 +41,6 @@ const dotf: Dotf = require('dotf');
 const splitLines: (str: string, options?: { preserveNewLines?: boolean })
   => string[] = require('split-lines');
 
-// TEMP CIRCULAR DEPS, TODO REMOVE
-// import { PROJECT_NAME } from './utils';
-const PROJECT_NAME = 'clasp';
-
 // TODO: workaround the circular dependency with `files.ts`
 // @see https://nodejs.org/api/fs.html#fs_fs_readfilesync_path_options
 const FS_OPTIONS = { encoding: 'utf8' };
@@ -53,57 +53,21 @@ export interface ProjectSettings {
   fileExtension?: string;
   filePushOrder?: string[];
 }
+
 // Dotfile names
-export const DOT = {
-  /**
-   * This dotfile stores information about ignoring files on `push`. Like .gitignore.
-   */
-  IGNORE: {
-    DIR: '~',
-    NAME: `${PROJECT_NAME}ignore`,
-    PATH: `.${PROJECT_NAME}ignore`,
-  },
-  /**
-   * This dotfile saves clasp project information, local to project directory.
-   */
-  PROJECT: {
-    DIR: path.join('.', '/'), // Relative to where the command is run. See DOTFILE.PROJECT()
-    NAME: `${PROJECT_NAME}.json`,
-    PATH: `.${PROJECT_NAME}.json`,
-  },
-  /**
-   * This dotfile saves auth information. Should never be committed.
-   * There are 2 types: personal & global:
-   * - Global: In the $HOME directory.
-   * - Personal: In the local directory.
-   * @see {ClaspToken}
-   */
-  RC: {
-    DIR: '~',
-    LOCAL_DIR: './',
-    NAME: `${PROJECT_NAME}rc.json`,
-    LOCAL_PATH: `.${PROJECT_NAME}rc.json`,
-    PATH: path.join('~', `.${PROJECT_NAME}rc.json`),
-    ABSOLUTE_PATH: path.join(os.homedir(), `.${PROJECT_NAME}rc.json`),
-    ABSOLUTE_LOCAL_PATH: path.join('.', `.${PROJECT_NAME}rc.json`),
-  },
-};
+// @grant the `DOT` object has been replaced with the `Conf` singleton
 
 // Methods for retrieving dotfiles.
 export const DOTFILE = {
   /**
-   * Reads DOT.IGNORE.PATH to get a glob pattern of ignored paths.
+   * Reads ignore.resolve() to get a glob pattern of ignored paths.
    * @return {Promise<string[]>} A list of file glob patterns
    */
   IGNORE: () => {
-    const projectPath = findUp.sync(DOT.PROJECT.PATH);
-    const ignoreDirectory = path.join(projectPath ? path.dirname(projectPath) : DOT.PROJECT.DIR);
+    const ignorePath = ignore.resolve();
     return new Promise<string[]>((resolve, reject) => {
-      if (
-        fs.existsSync(ignoreDirectory)
-        && fs.existsSync(DOT.IGNORE.PATH)
-      ) {
-        const buffer = stripBom(fs.readFileSync(DOT.IGNORE.PATH, FS_OPTIONS));
+      if (fs.existsSync(ignorePath)) {
+        const buffer = stripBom(fs.readFileSync(ignorePath, FS_OPTIONS));
         resolve(splitLines(buffer).filter((name: string) => name));
       } else {
         resolve(['**/**', '!appsscript.json', '!*.gs', '!*.js', '!*.ts', '!*.html']);
@@ -116,15 +80,21 @@ export const DOTFILE = {
    * @return {Dotf} A dotf with that dotfile. Null if there is no file
    */
   PROJECT: () => {
-    const projectPath = findUp.sync(DOT.PROJECT.PATH);
-    return dotf(projectPath ? path.dirname(projectPath) : DOT.PROJECT.DIR, DOT.PROJECT.NAME);
+    // ! TODO: currently limited if filename doesn't start with a dot '.'
+    const { dir, base } = path.parse(project.resolve());
+    if (base[0] === '.') {
+      return dotf(dir || '.', base.slice(1));
+    }
+    throw new Error('Project file must start with a dot (i.e. .clasp.json)');
   },
   // Stores {ClaspCredentials}
-  RC: dotf(DOT.RC.DIR, DOT.RC.NAME),
-  // Stores {ClaspCredentials}
-  RC_LOCAL: () => {
-    const localPath = findUp.sync(DOT.PROJECT.PATH);
-    return dotf(localPath ? path.dirname(localPath) : DOT.RC.LOCAL_DIR, DOT.RC.NAME);
+  AUTH: () => {
+    // ! TODO: currently limited if filename doesn't start with a dot '.'
+    const { dir, base } = path.parse(auth.resolve());
+    if (base[0] === '.') {
+      return dotf(dir || '.', base.slice(1));
+    }
+    throw new Error('Auth file must start with a dot (i.e. .clasp.json)');
   },
 };
 
diff --git a/src/files.ts b/src/files.ts
index 6b57e5b7..1fcaefc1 100644
--- a/src/files.ts
+++ b/src/files.ts
@@ -1,18 +1,16 @@
 import path from 'path';
-import findUp from 'find-up';
 import fs from 'fs-extra';
 import mkdirp from 'mkdirp';
 import multimatch from 'multimatch';
 import recursive from 'recursive-readdir';
-import { async } from 'rxjs/internal/scheduler/async';
 import ts2gas from 'ts2gas';
 import ts from 'typescript';
 import { loadAPICredentials, script } from './auth';
-import { DOT, DOTFILE } from './dotfile';
+import { Conf, PROJECT_MANIFEST_FILENAME } from './conf';
+import { DOTFILE } from './dotfile';
 import {
   ERROR,
   LOG,
-  PROJECT_MANIFEST_FILENAME,
   checkIfOnline,
   getAPIFileType,
   getProjectSettings,
@@ -20,6 +18,8 @@ import {
   spinner,
 } from './utils';
 
+const project = Conf.get().project;
+
 // @see https://nodejs.org/api/fs.html#fs_fs_readfilesync_path_options
 export const FS_OPTIONS = { encoding: 'utf8' };
 
@@ -49,7 +49,7 @@ export function getFileType(type: string, fileExtension?: string): string {
  * @returns {boolean} If .clasp.json exists.
  */
 export function hasProject(): boolean {
-  return fs.existsSync(DOT.PROJECT.PATH);
+  return fs.existsSync(project.resolve());
 }
 
 /**
@@ -58,8 +58,8 @@ export function hasProject(): boolean {
  */
 // TODO: unnecessary export
 export function getTranspileOptions(): ts.TranspileOptions {
-  const projectPath = findUp.sync(DOT.PROJECT.PATH);
-  const tsconfigPath = path.join(projectPath ? path.dirname(projectPath) : DOT.PROJECT.DIR, 'tsconfig.json');
+  const projectPath = project.resolvedDir;
+  const tsconfigPath = path.join(projectPath, 'tsconfig.json');
   if(fs.existsSync(tsconfigPath)) {
     const tsconfigContent = fs.readFileSync(tsconfigPath, FS_OPTIONS);
     const parsedConfigResult = ts.parseConfigFileTextToJson(tsconfigPath, tsconfigContent);
@@ -121,7 +121,7 @@ export async function getProjectFiles(rootDir: string = path.join('.', '/'), cal
         // Can't rename, conflicting files
         abortPush = true;
         // only print error once (for .gs)
-        if (path.extname(name) === '.gs') {
+          if (path.extname(name) === '.gs') {
           logError(null, ERROR.CONFLICTING_FILE_EXTENSION(fileNameWithoutExt));
         }
       }
diff --git a/src/index.ts b/src/index.ts
index c94f5b9e..495c33b7 100755
--- a/src/index.ts
+++ b/src/index.ts
@@ -21,8 +21,6 @@
  * clasp – The Apps Script CLI
  */
 
-import { PROJECT_NAME, handleError } from './utils';
-
 import apis from './commands/apis';
 import clone from './commands/clone';
 import commander from 'commander';
@@ -44,6 +42,11 @@ import status from './commands/status';
 import undeploy from './commands/undeploy';
 import version from './commands/version';
 import versions from './commands/versions';
+import { Conf, PROJECT_NAME } from './conf';
+import { handleError } from './utils';
+
+// instantiate the config singleton (and loads environment variables as a side effect)
+const config = Conf.get();
 
 // CLI
 
@@ -55,6 +58,46 @@ commander
   .usage(`<command> [options]`)
   .description(`${PROJECT_NAME} - The Apps Script CLI`);
 
+/**
+ * Path to an auth file, or to a folder with a '.clasprc.json' file.
+ */
+commander.option(
+  '-A, --auth <file>',
+  `path to an auth file or a folder with a '.clasprc.json' file.`,
+).on('option:auth', () => {
+  config.auth.path = commander['auth'];
+});
+
+/**
+ * Path to an ignore file, or to a folder with a '.claspignore'.
+ */
+commander.option(
+  '-I, --ignore <file>',
+  `path to an ignore file or a folder with a '.claspignore' file.`,
+).on('option:ignore', () => {
+  config.ignore.path = commander['ignore'];
+});
+
+/**
+ * Path to an manifest file, or to a folder with a 'appsscript.json' file.
+ */
+// commander.option(
+//   '-M, --manifest <file>',
+//   `path to an manifest file or a folder with a 'appsscript.json' file.`,
+// ).on('option:manifest', () => {
+//   config.manifest.path = commander['manifest'];
+// });
+
+/**
+ * Path to a project file, or to a folder with a '.clasp.json'.
+ */
+commander.option(
+  '-P, --project <file>',
+  `path to a project file or to a folder with a '.clasp.json' file.`,
+).on('option:project', () => {
+  config.project.path = commander['project'];
+});
+
 /**
  * Logs the user in. Saves the client credentials to an rc file.
  * @name login
@@ -343,7 +386,7 @@ commander
  * @example random
  */
 commander
-  .command('*', undefined, { isDefault: true })
+  .command('*', { isDefault: true })
   .description('Any other command is not supported')
   .action(handleError(defaultCmd));
 
@@ -354,6 +397,23 @@ commander.option('-v, --version').on('option:version', () => {
   console.log(require('../package.json').version);
 });
 
+/**
+ * TEMPORARY FOR DEBUG
+ * Displays clasp version
+ */
+commander
+  .command('paths')
+  .description('List current config files path')
+  .action(() => {
+    const conf = Conf.get();
+    const project = conf.project;
+    const ignore = conf.ignore;
+    const auth = conf.auth;
+    console.log('project', project.path, project.isDefault(), project.resolve());
+    console.log('ignore', ignore.path, ignore.isDefault(), ignore.resolve());
+    console.log('auth', auth.path, auth.isDefault(), auth.resolve());
+  });
+
 // defaults to help if commands are not provided
 if (!process.argv.slice(2).length) {
   commander.outputHelp();
diff --git a/src/manifest.ts b/src/manifest.ts
index 25d69b52..b93a1885 100644
--- a/src/manifest.ts
+++ b/src/manifest.ts
@@ -2,15 +2,20 @@ import path from 'path';
 import fs from 'fs-extra';
 import { PUBLIC_ADVANCED_SERVICES } from './apis';
 import { enableOrDisableAPI, isEnabled } from './apiutils';
-import { DOT } from './dotfile';
+import { Conf, PROJECT_MANIFEST_FILENAME } from './conf';
 import { FS_OPTIONS } from './files';
-import { ERROR, PROJECT_MANIFEST_FILENAME, getProjectSettings, getValidJSON, logError } from './utils';
+import { ERROR, getProjectSettings, getValidJSON, logError } from './utils';
+
+const project = Conf.get().project;
 
 /**
  * Checks if the rootDir appears to be a valid project.
+ *
+ * @param {string} rootDir dir to check.
+ *
  * @return {boolean} True if valid project, false otherwise
  */
-export const manifestExists = (rootDir: string = DOT.PROJECT.DIR): boolean =>
+export const manifestExists = (rootDir: string = project.resolvedDir): boolean =>
   fs.existsSync(path.join(rootDir, PROJECT_MANIFEST_FILENAME));
 
 /**
@@ -20,7 +25,7 @@ export const manifestExists = (rootDir: string = DOT.PROJECT.DIR): boolean =>
  */
 export async function readManifest(): Promise<Manifest> {
   let { rootDir } = await getProjectSettings();
-  if (typeof rootDir === 'undefined') rootDir = DOT.PROJECT.DIR;
+  if (typeof rootDir === 'undefined') rootDir = project.resolvedDir;
   const manifest = path.join(rootDir, PROJECT_MANIFEST_FILENAME);
   try {
     return fs.readJsonSync(manifest, FS_OPTIONS);
@@ -37,7 +42,7 @@ export async function readManifest(): Promise<Manifest> {
 // TODO: unnecessary export
 export async function writeManifest(manifest: Manifest) {
   let { rootDir } = await getProjectSettings();
-  if (typeof rootDir === 'undefined') rootDir = DOT.PROJECT.DIR;
+  if (typeof rootDir === 'undefined') rootDir = project.resolvedDir;
   const manifestFilePath = path.join(rootDir, PROJECT_MANIFEST_FILENAME);
   try {
     fs.writeJsonSync(manifestFilePath, manifest, { encoding: 'utf8', spaces: 2 });
@@ -78,7 +83,7 @@ export async function isValidRunManifest(): Promise<boolean> {
  */
 export async function getManifest(): Promise<Manifest> {
   let { rootDir } = await getProjectSettings();
-  if (typeof rootDir === 'undefined') rootDir = DOT.PROJECT.DIR;
+  if (typeof rootDir === 'undefined') rootDir = project.resolvedDir;
   const manifestString =  fs.readFileSync(path.join(rootDir, PROJECT_MANIFEST_FILENAME), FS_OPTIONS);
   return getValidJSON<Manifest>(manifestString);
 }
diff --git a/src/pathproxy.ts b/src/pathproxy.ts
new file mode 100644
index 00000000..d4903c49
--- /dev/null
+++ b/src/pathproxy.ts
@@ -0,0 +1,126 @@
+import path from 'path';
+import fs from 'fs-extra';
+
+/** A path broken down into a `dir`ectory and a `base` filename */
+export type PathParts = Pick<path.ParsedPath, 'dir' | 'base'>;
+
+export class PathProxy {
+  protected _default: PathParts;
+  protected _userDefined: string | undefined;
+
+  /**
+   * Handles a path to a file.
+   *
+   * - Constructor requires a default path (directory and filename)
+   * - Path can be overridden with the `path` accessor.
+   * - The `resolve()` method implements specific rules to define the effective path to the proxied file.
+   *
+   * @param {PathParts} defaultPath default path
+   */
+  constructor(defaultPath: PathParts) {
+    this._default = defaultPath;
+  }
+
+  /**
+   * Returns the current (raw and unresolved) defined path to the proxied file.
+   *
+   * *Note: for most uses, prefer the `resolve()` method in order to retreive a file's path*
+   *
+   * @returns {string}
+   */
+  get path(): string {
+    return this._userDefined || path.join(this._default.dir, this._default.base);
+  }
+
+  /**
+   * Sets the current (raw and unresolved) path to the proxied file.
+   *
+   * *Note: passing an empty string restores the default path*
+   */
+  set path(userDefined: string ) {
+    this._userDefined = userDefined === path.join(this._default.dir, this._default.base)
+      ? undefined
+      : userDefined;
+  }
+
+  /**
+   * Returns true if current path is the default.
+   *
+   * @returns {boolean}
+   */
+  isDefault(): boolean {
+    return !this._userDefined
+      || this._userDefined === path.join(this._default.dir, this._default.base);
+  }
+
+  /**
+   * Returns the resolved directory to the proxied file.
+   *
+   * *Note: for most uses, prefer the `.resolve()` method in order to retreive a file's path*
+   *
+   * @returns {string}
+   */
+  get resolvedDir(): string {
+    return path.dirname(this.resolve());
+  }
+
+  /**
+   * Resolves the current active path
+   *
+   * @returns {string}
+   */
+  resolve(): string {
+    return this._userDefined
+      ? resolvePath(this._userDefined, this._default.base)
+      : path.join(this._default.dir, this._default.base);
+  }
+}
+
+/**
+ * Attempts to resolve a path with the following rules:
+ *
+ * - if path exists and points to a file: use it as is
+ * - if path exists and points to a directory: append the default base filename to the path
+ * - if path partially resolves to an existing directory but base filename does not exists: use it as is
+ * - otherwise throw an error
+ *
+ * @param {string} pathToResolve the path to resolve
+ * @param {string} baseFilename the default base filename
+ *
+ * @returns {string}
+ */
+function resolvePath(pathToResolve: string, baseFilename: string) {
+  if (fs.existsSync(pathToResolve)) {
+    return appendBaseIfDirectory(pathToResolve, baseFilename);
+  }
+  const parsedPath = path.parse(pathToResolve);
+  if (parsedPath.dir === '' || fs.lstatSync(parsedPath.dir).isDirectory()) {
+    return pathToResolve; // assume fullpath to missing file
+  }
+  // TODO: improve support for unresolved paths
+  throw new Error(`Unrecognized path ${pathToResolve}`);
+}
+
+/**
+ * Attempts to resolve an **existing** path using the following rules:
+ *
+ * - if path exists and points to a file: use it as is
+ * - if path exists and points to a directory: append the default base filename to the path
+ * - otherwise throw an error
+ *
+ * @param {string} somePath the path to resolve
+ * @param {string} baseFilename the default base filename
+ *
+ * @returns {string}
+ */
+function appendBaseIfDirectory(somePath: string, baseFilename: string ): string {
+  const stats = fs.lstatSync(somePath);
+  if (stats.isFile()) {
+    return somePath;
+  }
+  if (stats.isDirectory()) {
+    return path.join(somePath, baseFilename);
+  }
+  // TODO: improve support for other stats types (stats.isSymbolicLink() ? )
+  throw new Error(`Unrecognized path ${somePath}`);
+}
diff --git a/src/utils.ts b/src/utils.ts
index 015880eb..79d6d310 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -4,18 +4,19 @@ import { Spinner } from 'cli-spinner';
 import fs from 'fs-extra';
 import { script_v1 } from 'googleapis';
 import pluralize from 'pluralize';
-import { ClaspToken, DOT, DOTFILE, ProjectSettings } from './dotfile';
+import { Conf, PROJECT_MANIFEST_FILENAME, PROJECT_NAME } from './conf';
+import { ClaspToken, DOTFILE, ProjectSettings } from './dotfile';
 import { projectIdPrompt } from './inquirer';
 import { URL } from './urls';
 
+const conf = Conf.get();
+const auth = conf.auth;
+const ignore = conf.ignore;
+const project = conf.project;
+
 const ucfirst = (str: string) => str && `${str[0].toUpperCase()}${str.slice(1)}`;
 const isOnline: (options?: { timeout?: number; version?: 'v4'|'v6'; }) => boolean = require('is-online');
 
-// Names / Paths
-export const PROJECT_NAME = 'clasp';
-export const PROJECT_MANIFEST_BASENAME = 'appsscript';
-export const PROJECT_MANIFEST_FILENAME = PROJECT_MANIFEST_BASENAME + '.json';
-
 /**
  * The installed credentials. This is a file downloaded from console.developers.google.com
  * Credentials > OAuth 2.0 client IDs > Type:Other > Download
@@ -40,8 +41,26 @@ export interface ClaspCredentials {
  * @param  {boolean} local check ./clasprc.json instead of ~/.clasprc.json
  * @return {boolean}
  */
-export const hasOauthClientSettings = (local = false): boolean =>
-  local ? fs.existsSync(DOT.RC.ABSOLUTE_LOCAL_PATH) : fs.existsSync(DOT.RC.ABSOLUTE_PATH);
+// export const hasOauthClientSettings = (local = false): boolean =>
+//   local ? fs.existsSync(DOT.RC.ABSOLUTE_LOCAL_PATH) : fs.existsSync(DOT.RC.ABSOLUTE_PATH);
+export const hasOauthClientSettings = (local = false): boolean => {
+  let result: boolean;
+  let previousPath: string | undefined = undefined;
+
+  if (local && auth.isDefault()) {
+    // if no local auth defined, try current directory
+    previousPath = auth.path;
+    auth.path = '.';
+  }
+
+  result = (local ? !auth.isDefault() : auth.isDefault()) && fs.existsSync(auth.resolve());
+
+  if (previousPath) {
+    auth.path = previousPath;
+  }
+
+  return result;
+};
 
 /**
  * Gets the OAuth client settings from rc file.
@@ -50,10 +69,24 @@ export const hasOauthClientSettings = (local = false): boolean =>
  * @returns {Promise<ClaspToken>} A promise to get the rc file as object.
  */
 export function getOAuthSettings(local: boolean): Promise<ClaspToken> {
-  const RC = (local) ? DOTFILE.RC_LOCAL() : DOTFILE.RC;
-  return RC
+  let result;
+  let previousPath: string | undefined = undefined;
+
+  if (local && auth.isDefault()) {
+    // if no local auth defined, try current directory
+    previousPath = auth.path;
+    auth.path = '.';
+  }
+
+  result = DOTFILE.AUTH()
     .read<ClaspToken>()
     .catch((err: Error) => logError(err, ERROR.NO_CREDENTIALS(local)));
+
+  if (previousPath) {
+    auth.path = previousPath;
+  }
+
+  return result;
 }
 
 // Error messages (some errors take required params)
@@ -72,8 +105,7 @@ Forgot ${PROJECT_NAME} commands? Get help:\n  ${PROJECT_NAME} --help`,
   DEPLOYMENT_COUNT: `Unable to deploy; Scripts may only have up to 20 versioned deployments at a time.`,
   DRIVE: `Something went wrong with the Google Drive API`,
   EXECUTE_ENTITY_NOT_FOUND: `Script API executable not published/deployed.`,
-  // FOLDER_EXISTS: `Project file already exists.`, // TEMP!
-  FOLDER_EXISTS: `Project file (${DOT.PROJECT.PATH}) already exists.`,
+  FOLDER_EXISTS: `Project file (${project.resolve()}) already exists.`,
   FS_DIR_WRITE: 'Could not create directory.',
   FS_FILE_WRITE: 'Could not write file.',
   INVALID_JSON: `Input params not Valid JSON string. Please fix and try again`,
@@ -87,7 +119,7 @@ Forgot ${PROJECT_NAME} commands? Get help:\n  ${PROJECT_NAME} --help`,
   NO_CREDENTIALS: (local: boolean) => `Could not read API credentials. ` +
     `Are you logged in ${local ? 'locall' : 'globall'}y?`,
   NO_FUNCTION_NAME: 'N/A',
-  NO_GCLOUD_PROJECT: `No projectId found in your ${DOT.PROJECT.PATH} file.`,
+  NO_GCLOUD_PROJECT: `No projectId found in your ${project.resolve()} file.`,
   NO_LOCAL_CREDENTIALS: `Requires local crendetials:\n\n  ${PROJECT_NAME} login --creds <file.json>`,
   NO_MANIFEST: (filename: string) =>
     `Manifest: ${filename} invalid. \`create\` or \`clone\` a project first.`,
@@ -105,14 +137,14 @@ Forgot ${PROJECT_NAME} commands? Get help:\n  ${PROJECT_NAME} --help`,
   RATE_LIMIT: 'Rate limit exceeded. Check quota.',
   RUN_NODATA: 'Script execution API returned no data.',
   READ_ONLY_DELETE: 'Unable to delete read-only deployment.',
-  SCRIPT_ID_DNE: `No scriptId found in your ${DOT.PROJECT.PATH} file.`,
+  SCRIPT_ID_DNE: `No scriptId found in your ${project.resolve()} file.`,
   SCRIPT_ID_INCORRECT: (scriptId: string) => `The scriptId "${scriptId}" looks incorrect.
 Did you provide the correct scriptId?`,
   SCRIPT_ID: `Could not find script.
 Did you provide the correct scriptId?
 Are you logged in to the correct account with the script?`,
   SETTINGS_DNE: `
-No valid ${DOT.PROJECT.PATH} project file. You may need to \`create\` or \`clone\` a project first.`,
+No valid ${project.resolve()} project file. You may need to \`create\` or \`clone\` a project first.`,
   UNAUTHENTICATED_LOCAL: `Error: Local client credentials unauthenticated. Check scopes/authorization.`,
   UNAUTHENTICATED: 'Error: Unauthenticated request: Please try again.',
   UNKNOWN_KEY: (key: string) => `Unknown key "${key}"`,
@@ -132,7 +164,7 @@ export const LOG = {
   AUTH_SUCCESSFUL: `Authorization successful.`,
   AUTHORIZE: (authUrl: string) => `🔑 Authorize ${PROJECT_NAME} by visiting this url:\n${authUrl}\n`,
   CLONE_SUCCESS: (fileNum: number) => `Warning: files in subfolder are not accounted for unless you set a '${
-    DOT.IGNORE.PATH
+    ignore.resolve()
   }' file.
 Cloned ${fileNum} ${pluralize('files', fileNum)}.`,
   CLONING: 'Cloning files...',
@@ -159,7 +191,7 @@ Cloned ${fileNum} ${pluralize('files', fileNum)}.`,
   GET_PROJECT_ID_INSTRUCTIONS: `Go to *Resource > Cloud Platform Project...* and copy your projectId
 (including "project-id-")`,
   GIVE_DESCRIPTION: 'Give a description: ',
-  LOCAL_CREDS: `Using local credentials: ${DOT.RC.LOCAL_DIR}${DOT.RC.NAME} 🔐 `,
+  LOCAL_CREDS: `Using local credentials: ${auth.resolve()} 🔐 `,
   LOGIN: (isLocal: boolean) => `Logging in ${isLocal ? 'locally' : 'globally'}...`,
   LOGS_SETUP: 'Finished setting up logs.\n',
   NO_GCLOUD_PROJECT: `No projectId found. Running ${PROJECT_NAME} logs --setup.`,
@@ -176,10 +208,11 @@ Cloned ${fileNum} ${pluralize('files', fileNum)}.`,
   PUSHING: 'Pushing files...',
   SAVED_CREDS: (isLocalCreds: boolean) =>
     isLocalCreds
-    ? `Local credentials saved to: ${DOT.RC.LOCAL_DIR}${DOT.RC.ABSOLUTE_LOCAL_PATH}.\n` +
-    `*Be sure to never commit this file!* It's basically a password.`
-    : `Default credentials saved to: ${DOT.RC.PATH} (${DOT.RC.ABSOLUTE_PATH}).`,
-SCRIPT_LINK: (scriptId: string) => `https://script.google.com/d/${scriptId}/edit`,
+      ? `Local credentials saved to: ${auth.resolve()}.
+*Be sure to never commit this file!* It's basically a password.`
+      : `Default credentials saved to: ${auth.resolve()}.`,
+  SCRIPT_LINK: (scriptId: string) => `https://script.google.com/d/${scriptId}/edit`,
+  // TODO: `SCRIPT_RUN` is never used
   SCRIPT_RUN: (functionName: string) => `Executing: ${functionName}`,
   STACKDRIVER_SETUP: 'Setting up StackDriver Logging.',
   STATUS_IGNORE: 'Ignored files:',
@@ -192,6 +225,7 @@ SCRIPT_LINK: (scriptId: string) => `https://script.google.com/d/${scriptId}/edit
   VERSION_DESCRIPTION: ({ versionNumber, description }: script_v1.Schema$Version) =>
     `${versionNumber} - ` + (description || '(no description)'),
   VERSION_NUM: (numVersions: number) => `~ ${numVersions} ${pluralize('Version', numVersions)} ~`,
+  // TODO: `SETUP_LOCAL_OAUTH` is never used
   SETUP_LOCAL_OAUTH: (projectId: string) => `1. Create a client ID and secret:
     Open this link: ${chalk.blue(URL.CREDS(projectId))}
     Click ${chalk.cyan('Create credentials')}, then select ${chalk.yellow('OAuth client ID')}.
@@ -257,9 +291,9 @@ export function getWebApplicationURL(deployment: script_v1.Schema$Deployment) {
   const entryPoints = deployment.entryPoints || [];
   const webEntryPoint = entryPoints.find((entryPoint: script_v1.Schema$EntryPoint) =>
     entryPoint.entryPointType === 'WEB_APP');
-  if (webEntryPoint) return webEntryPoint.webApp && webEntryPoint.webApp.url;
-  logError(null, ERROR.NO_WEBAPP(deployment.deploymentId || ''));
-}
+    if (webEntryPoint) return webEntryPoint.webApp && webEntryPoint.webApp.url;
+    logError(null, ERROR.NO_WEBAPP(deployment.deploymentId || ''));
+  }
 
 /**
  * Gets default project name.