Upgrades ESLint and related plugins/configs. (#2231)

Summary:
This fixes some security issues reported by GitHub.

There are still warnings on the lint, but no errors. I had to make some changes. Most notably:

## `.eslintrc.js`

Changed the value of `rules` because it was required by the new `eslint-plugin-prettier`. See prettier/eslint-plugin-prettier@478c7e5

## `/src`

Changed some lints referencing `fb-www/`. ESLint 6 reports errors on rules that aren't found (see: eslint/eslint@2d32a9e). For some reason `fb-www` rules are not found. Changing the disables to be `/* eslint-disable-next-line */` makes them valid both the open source config and Facebook's internal config.
Pull Request resolved: #2231

Reviewed By: claudiopro

Differential Revision: D18206971

Pulled By: mrkev

fbshipit-source-id: 55ca3e8a24c61250dd7cd01220ed55c73a140b9d

.eslintrc.js

@@ -14,7 +14,7 @@ module.exports = {
     'prettier/standard',
   ],
   rules: {
-    'prettier/prettier': ['error', 'fb'],
+    'prettier/prettier': ['error'],
   },
   plugins: ['prettier'],
   overrides: [

package.json

@@ -52,15 +52,15 @@
     "del": "^2.2.0",
     "envify": "^3.4.0",
     "es6-shim": "^0.34.4",
-    "eslint": "^5.16.0",
-    "eslint-config-fbjs": "^2.0.0",
-    "eslint-config-prettier": "^2.6.0",
-    "eslint-plugin-babel": "^4.1.1",
-    "eslint-plugin-flowtype": "^2.17.1",
-    "eslint-plugin-jsx-a11y": "^6.0.2",
-    "eslint-plugin-prettier": "^2.3.1",
-    "eslint-plugin-react": "^7.3.0",
-    "eslint-plugin-relay": "^0.0.8",
+    "eslint": "^6.6.0",
+    "eslint-config-fbjs": "^3.1.1",
+    "eslint-config-prettier": "^6.5.0",
+    "eslint-plugin-babel": "^5.3.0",
+    "eslint-plugin-flowtype": "^4.3.0",
+    "eslint-plugin-jsx-a11y": "^6.2.3",
+    "eslint-plugin-prettier": "^3.1.1",
+    "eslint-plugin-react": "^7.16.0",
+    "eslint-plugin-relay": "^1.3.12",
     "fbjs-scripts": "^1.1.0",
     "flow-bin": "^0.92.0",
     "gulp": "^4.0.0",

src/component/selection/getUpdatedSelectionState.js

@@ -28,9 +28,8 @@ function getUpdatedSelectionState(
   const selection: SelectionState = nullthrows(editorState.getSelection());
   if (__DEV__) {
     if (!anchorKey || !focusKey) {
-      /* eslint-disable fb-www/no-console */
+      /* eslint-disable-next-line */
       console.warn('Invalid selection state.', arguments, editorState.toJS());
-      /* eslint-enable fb-www/no-console */
       return selection;
     }
   }
@@ -50,9 +49,8 @@ function getUpdatedSelectionState(
   if (!anchorLeaf || !focusLeaf) {
     // If we cannot make sense of the updated selection state, stick to the current one.
     if (__DEV__) {
-      /* eslint-disable fb-www/no-console */
+      /* eslint-disable-next-line */
       console.warn('Invalid selection state.', arguments, editorState.toJS());
-      /* eslint-enable fb-www/no-console */
     }
     return selection;
   }

src/model/modifier/__tests__/AtomicBlockUtils-test.js

@@ -33,9 +33,8 @@ const CHARACTER = ' ';
 
 const getInvariantViolation = msg => {
   try {
-    /* eslint-disable fb-www/sprintf-like-args */
+    /* eslint-disable-next-line */
     invariant(false, msg);
-    /* eslint-enable fb-www/sprintf-like-args */
   } catch (e) {
     return e;
   }

src/model/transaction/__tests__/insertFragmentIntoContentState-test.js

@@ -39,9 +39,8 @@ const initialBlock = contentState.getBlockMap().first();
 
 const getInvariantViolation = msg => {
   try {
-    /* eslint-disable fb-www/sprintf-like-args */
+    /* eslint-disable-next-line */
     invariant(false, msg);
-    /* eslint-enable fb-www/sprintf-like-args */
   } catch (e) {
     return e;
   }