(clean): remove unused test/utils/psKill and its deps

- nothing uses it or its deps and it doesn't seem to have ever been
  used -- the commit that added it (89c0470) didn't use it either

package.json

@@ -106,7 +106,6 @@
     "@types/ms": "^0.7.30",
     "@types/node": "^13.1.0",
     "@types/ora": "^3.2.0",
-    "@types/ps-tree": "^1.1.0",
     "@types/react": "^16.9.11",
     "@types/rollup-plugin-json": "^3.0.2",
     "@types/rollup-plugin-sourcemaps": "^0.4.2",
@@ -119,7 +118,6 @@
     "husky": "^4.2.2",
     "np": "^6.2.0",
     "pretty-quick": "^2.0.0",
-    "ps-tree": "^1.2.0",
     "react": "^16.8.6",
     "react-dom": "^16.13.0",
     "react-is": "^16.13.0",

yarn.lock

@@ -1288,11 +1288,6 @@
   resolved "https://registry.yarnpkg.com/@types/prop-types/-/prop-types-15.7.3.tgz#2ab0d5da2e5815f94b0b9d4b95d1e5f243ab2ca7"
   integrity sha512-KfRL3PuHmqQLOG+2tGpRO26Ctg+Cq1E01D2DMriKEATHgWLfeNDmq9e29Q9WIky0dQ3NPkd1mzYH8Lm936Z9qw==
 
-"@types/ps-tree@^1.1.0":
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/@types/ps-tree/-/ps-tree-1.1.0.tgz#7e2034e8ccdc16f6b0ced7a88529ebcb3b1dc424"
-  integrity sha512-rm5GU5sefQpg2d/DQ+fMDZnl9aPiJjJ9FYA12isIocNTZqu9VDZRgCRBx3oYFEdmDpmPmY4hxxmY/+1a84Rtzg==
-
 "@types/q@^1.5.1":
   version "1.5.2"
   resolved "https://registry.yarnpkg.com/@types/q/-/q-1.5.2.tgz#690a1475b84f2a884fd07cd797c00f5f31356ea8"
@@ -2942,11 +2937,6 @@ duplexer3@^0.1.4:
   resolved "https://registry.yarnpkg.com/duplexer3/-/duplexer3-0.1.4.tgz#ee01dd1cac0ed3cbc7fdbea37dc0a8f1ce002ce2"
   integrity sha1-7gHdHKwO08vH/b6jfcCo8c4ALOI=
 
-duplexer@~0.1.1:
-  version "0.1.1"
-  resolved "https://registry.yarnpkg.com/duplexer/-/duplexer-0.1.1.tgz#ace6ff808c1ce66b57d1ebf97977acb02334cfc1"
-  integrity sha1-rOb/gIwc5mtX0ev5eXessCM0z8E=
-
 ecc-jsbn@~0.1.1:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/ecc-jsbn/-/ecc-jsbn-0.1.2.tgz#3a83a904e54353287874c564b7549386849a98c9"
@@ -3313,19 +3303,6 @@ esutils@^2.0.2:
   resolved "https://registry.yarnpkg.com/esutils/-/esutils-2.0.3.tgz#74d2eb4de0b8da1293711910d50775b9b710ef64"
   integrity sha512-kVscqXk4OCp68SZ0dkgEKVi6/8ij300KBWTJq32P/dYeWTSwK41WyTxalN1eRmA5Z9UU/LX9D7FWSmV9SAYx6g==
 
-event-stream@=3.3.4:
-  version "3.3.4"
-  resolved "https://registry.yarnpkg.com/event-stream/-/event-stream-3.3.4.tgz#4ab4c9a0f5a54db9338b4c34d86bfce8f4b35571"
-  integrity sha1-SrTJoPWlTbkzi0w02Gv86PSzVXE=
-  dependencies:
-    duplexer "~0.1.1"
-    from "~0"
-    map-stream "~0.1.0"
-    pause-stream "0.0.11"
-    split "0.3"
-    stream-combiner "~0.0.4"
-    through "~2.3.1"
-
 exec-sh@^0.3.2:
   version "0.3.4"
   resolved "https://registry.yarnpkg.com/exec-sh/-/exec-sh-0.3.4.tgz#3a018ceb526cc6f6df2bb504b2bfe8e3a4934ec5"
@@ -3634,11 +3611,6 @@ fragment-cache@^0.2.1:
   dependencies:
     map-cache "^0.2.2"
 
-from@~0:
-  version "0.1.7"
-  resolved "https://registry.yarnpkg.com/from/-/from-0.1.7.tgz#83c60afc58b9c56997007ed1a768b3ab303a44fe"
-  integrity sha1-g8YK/Fi5xWmXAH7Rp2izqzA6RP4=
-
 fs-extra@8.1.0, fs-extra@^8.0.1:
   version "8.1.0"
   resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-8.1.0.tgz#49d43c45a88cd9677668cb7be1b46efdb8d2e1c0"
@@ -5483,11 +5455,6 @@ map-obj@^4.0.0:
   resolved "https://registry.yarnpkg.com/map-obj/-/map-obj-4.1.0.tgz#b91221b542734b9f14256c0132c897c5d7256fd5"
   integrity sha512-glc9y00wgtwcDmp7GaE/0b0OnxpNJsVf3ael/An6Fe2Q51LLwN1er6sdomLRzz5h0+yMpiYLhWYF5R7HeqVd4g==
 
-map-stream@~0.1.0:
-  version "0.1.0"
-  resolved "https://registry.yarnpkg.com/map-stream/-/map-stream-0.1.0.tgz#e56aa94c4c8055a16404a0674b78f215f7c8e194"
-  integrity sha1-5WqpTEyAVaFkBKBnS3jyFffI4ZQ=
-
 map-visit@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/map-visit/-/map-visit-1.0.0.tgz#ecdca8f13144e660f1b5bd41f12f3479d98dfb8f"
@@ -6403,13 +6370,6 @@ path-type@^4.0.0:
   resolved "https://registry.yarnpkg.com/path-type/-/path-type-4.0.0.tgz#84ed01c0a7ba380afe09d90a8c180dcd9d03043b"
   integrity sha512-gDKb8aZMDeD/tZWs9P6+q0J9Mwkdl6xMV8TjnGP3qJVJ06bdMgkbBlLU8IdfOsIsFz2BW1rNVT3XuNEl8zPAvw==
 
-pause-stream@0.0.11:
-  version "0.0.11"
-  resolved "https://registry.yarnpkg.com/pause-stream/-/pause-stream-0.0.11.tgz#fe5a34b0cbce12b5aa6a2b403ee2e73b602f1445"
-  integrity sha1-/lo0sMvOErWqaitAPuLnO2AvFEU=
-  dependencies:
-    through "~2.3"
-
 performance-now@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-2.1.0.tgz#6309f4e0e5fa913ec1c69307ae364b4b377c9e7b"
@@ -6930,13 +6890,6 @@ prop-types@^15.6.2, prop-types@^15.7.2:
     object-assign "^4.1.1"
     react-is "^16.8.1"
 
-ps-tree@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/ps-tree/-/ps-tree-1.2.0.tgz#5e7425b89508736cdd4f2224d028f7bb3f722ebd"
-  integrity sha512-0VnamPPYHl4uaU/nSFeZZpR21QAWRz+sRv4iW9+v/GS/J5U5iZB5BNN6J0RMoOvdx2gWM2+ZFMIm58q24e4UYA==
-  dependencies:
-    event-stream "=3.3.4"
-
 psl@^1.1.24, psl@^1.1.28:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/psl/-/psl-1.5.0.tgz#47fd1292def7fdb1e138cd78afa8814cebcf7b13"
@@ -7808,13 +7761,6 @@ split-string@^3.0.1, split-string@^3.0.2:
   dependencies:
     extend-shallow "^3.0.0"
 
-split@0.3:
-  version "0.3.3"
-  resolved "https://registry.yarnpkg.com/split/-/split-0.3.3.tgz#cd0eea5e63a211dfff7eb0f091c4133e2d0dd28f"
-  integrity sha1-zQ7qXmOiEd//frDwkcQTPi0N0o8=
-  dependencies:
-    through "2"
-
 split@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/split/-/split-1.0.1.tgz#605bd9be303aa59fb35f9229fbea0ddec9ea07d9"
@@ -7870,13 +7816,6 @@ stealthy-require@^1.1.1:
   resolved "https://registry.yarnpkg.com/stealthy-require/-/stealthy-require-1.1.1.tgz#35b09875b4ff49f26a777e509b3090a3226bf24b"
   integrity sha1-NbCYdbT/SfJqd35QmzCQoyJr8ks=
 
-stream-combiner@~0.0.4:
-  version "0.0.4"
-  resolved "https://registry.yarnpkg.com/stream-combiner/-/stream-combiner-0.0.4.tgz#4d5e433c185261dde623ca3f44c586bcf5c4ad14"
-  integrity sha1-TV5DPBhSYd3mI8o/RMWGvPXErRQ=
-  dependencies:
-    duplexer "~0.1.1"
-
 string-hash@^1.1.1:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/string-hash/-/string-hash-1.1.3.tgz#e8aafc0ac1855b4666929ed7dd1275df5d6c811b"
@@ -8204,7 +8143,7 @@ throat@^4.0.0:
   resolved "https://registry.yarnpkg.com/throat/-/throat-4.1.0.tgz#89037cbc92c56ab18926e6ba4cbb200e15672a6a"
   integrity sha1-iQN8vJLFarGJJua6TLsgDhVnKmo=
 
-through@2, through@^2.3.6, through@^2.3.8, through@~2.3, through@~2.3.1:
+through@2, through@^2.3.6, through@^2.3.8:
   version "2.3.8"
   resolved "https://registry.yarnpkg.com/through/-/through-2.3.8.tgz#0dd4c9ffaabc357960b1b724115d7e0e86a2e1f5"
   integrity sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=