[test] use prettier:check instead of implicit run via eslint

.eslintrc.js

@@ -18,7 +18,7 @@ module.exports = {
     ecmaVersion: 7,
     sourceType: 'module',
   },
-  plugins: ['babel', 'import', 'jsx-a11y', 'mocha', 'flowtype', 'material-ui', 'prettier'],
+  plugins: ['babel', 'import', 'jsx-a11y', 'mocha', 'flowtype', 'material-ui'],
   settings: {
     'import/resolver': {
       webpack: {
@@ -104,8 +104,6 @@ module.exports = {
     'flowtype/type-id-match': 'off',
     'flowtype/use-flow-type': 'error',
 
-    'prettier/prettier': 'error',
-
     'jsx-a11y/label-has-associated-control': 'off',
     'jsx-a11y/label-has-for': 'off',
     'jsx-a11y/no-autofocus': 'off', // We are a library, people do what they want.

package.json

@@ -101,7 +101,6 @@
     "eslint-plugin-jsx-a11y": "^6.0.3",
     "eslint-plugin-material-ui": "file:packages/eslint-plugin-material-ui",
     "eslint-plugin-mocha": "^5.0.0",
-    "eslint-plugin-prettier": "^2.3.1",
     "eslint-plugin-react": "^7.4.0",
     "eslint-plugin-spellcheck": "^0.0.10",
     "fg-loadcss": "^2.0.1",

yarn.lock

@@ -4346,13 +4346,6 @@ eslint-plugin-mocha@^5.0.0:
   dependencies:
     ramda "^0.25.0"
 
-eslint-plugin-prettier@^2.3.1:
-  version "2.6.2"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-prettier/-/eslint-plugin-prettier-2.6.2.tgz#71998c60aedfa2141f7bfcbf9d1c459bf98b4fad"
-  dependencies:
-    fast-diff "^1.1.1"
-    jest-docblock "^21.0.0"
-
 eslint-plugin-react@^7.4.0:
   version "7.11.0"
   resolved "https://registry.yarnpkg.com/eslint-plugin-react/-/eslint-plugin-react-7.11.0.tgz#b3124af974c4da978e62a57ea49a7bc26f11e76d"
@@ -4673,10 +4666,6 @@ fast-deep-equal@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz#7b05218ddf9667bf7f370bf7fdb2cb15fdd0aa49"
 
-fast-diff@^1.1.1:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/fast-diff/-/fast-diff-1.1.2.tgz#4b62c42b8e03de3f848460b639079920695d0154"
-
 fast-glob@^2.0.2:
   version "2.2.2"
   resolved "https://registry.yarnpkg.com/fast-glob/-/fast-glob-2.2.2.tgz#71723338ac9b4e0e2fff1d6748a2a13d5ed352bf"
@@ -6115,10 +6104,6 @@ jest-diff@^23.2.0:
     jest-get-type "^22.1.0"
     pretty-format "^23.2.0"
 
-jest-docblock@^21.0.0:
-  version "21.2.0"
-  resolved "https://registry.yarnpkg.com/jest-docblock/-/jest-docblock-21.2.0.tgz#51529c3b30d5fd159da60c27ceedc195faf8d414"
-
 jest-get-type@^22.1.0:
   version "22.4.3"
   resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-22.4.3.tgz#e3a8504d8479342dd4420236b322869f18900ce4"