Migrate to eslint-plugin-matrix-org

This migrates to the new plugin form of our custom ESLint configs. As part of
this, some packages are de-duplicated, configs streamlined, etc.

.eslintrc.js

@@ -1,7 +1,10 @@
 module.exports = {
-    extends: ["matrix-org", "matrix-org/react-legacy"],
+    plugins: ["matrix-org"],
-    parser: "babel-eslint",
+    extends: [
-
+        "plugin:matrix-org/javascript",
+        "plugin:matrix-org/react",
+    ],
+    parser: "@babel/eslint-parser",
     env: {
         browser: true,
         node: true,
@@ -15,12 +18,30 @@ module.exports = {
         "prefer-promise-reject-errors": "off",
         "no-async-promise-executor": "off",
         "quotes": "off",
-    },
+        "no-extra-boolean-cast": "off",
 
+        // Bind or arrow functions in props causes performance issues (but we
+        // currently use them in some places).
+        // It's disabled here, but we should using it sparingly.
+        "react/jsx-no-bind": "off",
+        "react/jsx-key": ["error"],
+    },
     overrides: [{
-        "files": ["src/**/*.{ts,tsx}", "test/**/*.{ts,tsx}"],
+        "files": [
-        "extends": ["matrix-org/ts"],
+            "src/**/*.{ts,tsx}",
+            "test/**/*.{ts,tsx}",
+        ],
+        "extends": [
+            "plugin:matrix-org/typescript",
+            "plugin:matrix-org/react",
+        ],
         "rules": {
+            // Things we do that break the ideal style
+            "prefer-promise-reject-errors": "off",
+            "quotes": "off",
+            "indent": "off",
+            "no-extra-boolean-cast": "off",
+
             // We're okay being explicit at the moment
             "@typescript-eslint/no-empty-interface": "off",
             // We disable this while we're transitioning
@@ -28,8 +49,6 @@ module.exports = {
             // We'd rather not do this but we do
             "@typescript-eslint/ban-ts-comment": "off",
 
-            "quotes": "off",
-            "no-extra-boolean-cast": "off",
             "no-restricted-properties": [
                 "error",
                 ...buildRestrictedPropertiesOptions(

package.json

@@ -104,6 +104,8 @@
   "devDependencies": {
     "@babel/cli": "^7.12.10",
     "@babel/core": "^7.12.10",
+    "@babel/eslint-parser": "^7.12.10",
+    "@babel/eslint-plugin": "^7.12.10",
     "@babel/parser": "^7.12.11",
     "@babel/plugin-proposal-class-properties": "^7.12.1",
     "@babel/plugin-proposal-decorators": "^7.12.12",
@@ -137,17 +139,16 @@
     "@types/react-transition-group": "^4.4.0",
     "@types/sanitize-html": "^2.3.1",
     "@types/zxcvbn": "^4.4.0",
-    "@typescript-eslint/eslint-plugin": "^4.14.0",
+    "@typescript-eslint/eslint-plugin": "^4.17.0",
-    "@typescript-eslint/parser": "^4.14.0",
+    "@typescript-eslint/parser": "^4.17.0",
     "@wojtekmaj/enzyme-adapter-react-17": "^0.6.1",
-    "babel-eslint": "^10.1.0",
     "babel-jest": "^26.6.3",
     "chokidar": "^3.5.1",
     "concurrently": "^5.3.0",
     "enzyme": "^3.11.0",
     "eslint": "7.18.0",
-    "eslint-config-matrix-org": "^0.2.0",
+    "eslint-config-google": "^0.14.0",
-    "eslint-plugin-babel": "^5.3.1",
+    "eslint-plugin-matrix-org": "github:matrix-org/eslint-plugin-matrix-org#main",
     "eslint-plugin-react": "^7.22.0",
     "eslint-plugin-react-hooks": "^4.2.0",
     "glob": "^7.1.6",

test/.eslintrc.js

@@ -5,6 +5,6 @@ module.exports = {
 
     // mocha defines a 'this'
     rules: {
-        "babel/no-invalid-this": "off",
+        "@babel/no-invalid-this": "off",
     },
 };