Lint against function polyfills that may be expensive (#1597)

* Lint against polyfills that may be expensive

* Exclude test file from source code linting

.eslintrc

@@ -1,7 +1,8 @@
 {
     "parser": "babel-eslint",
     "plugins": [
-        "flowtype"
+        "flowtype",
+        "transform-runtime-aliasing"
     ],
     "extends": [
         "eslint:recommended",
@@ -72,9 +73,10 @@
     },
     "overrides": [{
         "files": ["katex.js", "src/**/*.js", "contrib/**/*.js"],
-        "excludedFiles": "unicodeMake.js",
+        "excludedFiles": ["*-spec.js", "unicodeMake.js"],
         "rules": {
-            "no-restricted-syntax": [2, "ForOfStatement", "ClassDeclaration[superClass]", "ClassExpression[superClass]"]
+            "no-restricted-syntax": [2, "ForOfStatement", "ClassDeclaration[superClass]", "ClassExpression[superClass]"],
+            "transform-runtime-aliasing/no-transform-runtime-aliasing": 2
         }
     }],
     "env": {

package.json

@@ -33,6 +33,7 @@
     "eslint": "^5.0.0",
     "eslint-plugin-flowtype": "^2.40.1",
     "eslint-plugin-react": "^7.10.0",
+    "eslint-plugin-transform-runtime-aliasing": "^0.1.1",
     "file-loader": "^1.1.11",
     "flow-bin": "^0.78.0",
     "husky": "^1.0.0-rc.8",

yarn.lock

@@ -2407,6 +2407,10 @@ eslint-plugin-react@^7.10.0:
     jsx-ast-utils "^2.0.1"
     prop-types "^15.6.2"
 
+eslint-plugin-transform-runtime-aliasing@^0.1.1:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-transform-runtime-aliasing/-/eslint-plugin-transform-runtime-aliasing-0.1.1.tgz#1f496a2e4a0ebf7cad8486ae70c034bda06ac0f3"
+
 eslint-scope@3.7.1:
   version "3.7.1"
   resolved "https://registry.yarnpkg.com/eslint-scope/-/eslint-scope-3.7.1.tgz#3d63c3edfda02e06e01a452ad88caacc7cdcb6e8"