Enable more eslint recommended rules (#11168)

* chore: enable no-constant-condition

* chore: enable no-empty rule

* chore: enable no-unreachable

* chore: enable no-cond-assign

* chore: enable no-inner-declarations

* chore: remove disabled rules that are not in eslint:recommended

* fix: oops

eslint/babel-eslint-config-internal/index.js

@@ -19,29 +19,14 @@ module.exports = {
     browser: true,
   },
   rules: {
-    camelcase: "off",
-    "consistent-return": "off",
     curly: ["error", "multi-line"],
     "linebreak-style": ["error", "unix"],
-    "new-cap": "off",
     "no-case-declarations": "error",
-    "no-cond-assign": "off",
     "no-confusing-arrow": "error",
-    "no-console": "off",
+    "no-empty": ["error", { allowEmptyCatch: true }],
-    "no-constant-condition": "off",
-    "no-empty": "off",
-    "no-inner-declarations": "off",
-    "no-labels": "off",
-    "no-loop-func": "off",
     "no-process-exit": "error",
-    "no-return-assign": "off",
-    "no-shadow": "off",
-    "no-underscore-dangle": "off",
-    "no-unreachable": "off",
-    "no-use-before-define": "off",
     "no-var": "error",
     "prefer-const": "error",
-    strict: "off",
     "flowtype/define-flow-type": "warn",
     "flowtype/use-flow-type": "warn",
   },

packages/babel-generator/src/generators/modules.js

@@ -99,7 +99,7 @@ function ExportDeclaration(node: Object) {
 
     // print "special" specifiers first
     let hasSpecial = false;
-    while (true) {
+    for (;;) {
       const first = specifiers[0];
       if (
         t.isExportDefaultSpecifier(first) ||
@@ -149,7 +149,7 @@ export function ImportDeclaration(node: Object) {
   const specifiers = node.specifiers.slice(0);
   if (specifiers && specifiers.length) {
     // print "special" specifiers first
-    while (true) {
+    for (;;) {
       const first = specifiers[0];
       if (
         t.isImportDefaultSpecifier(first) ||

packages/babel-helper-fixtures/src/index.js

@@ -78,34 +78,7 @@ function findFile(filepath: string, allowJSON: boolean) {
   return matches[0];
 }
 
-export default function get(entryLoc): Array<Suite> {
+function pushTask(taskName, taskDir, suite, suiteName) {
-  const suites = [];
-
-  let rootOpts = {};
-  const rootOptsLoc = tryResolve(entryLoc + "/options");
-  if (rootOptsLoc) rootOpts = require(rootOptsLoc);
-
-  for (const suiteName of fs.readdirSync(entryLoc)) {
-    if (shouldIgnore(suiteName)) continue;
-
-    const suite = {
-      options: clone(rootOpts),
-      tests: [],
-      title: humanize(suiteName),
-      filename: entryLoc + "/" + suiteName,
-    };
-
-    assertDirectory(suite.filename);
-    suites.push(suite);
-
-    const suiteOptsLoc = tryResolve(suite.filename + "/options");
-    if (suiteOptsLoc) suite.options = require(suiteOptsLoc);
-
-    for (const taskName of fs.readdirSync(suite.filename)) {
-      push(taskName, suite.filename + "/" + taskName);
-    }
-
-    function push(taskName, taskDir) {
   const taskDirStats = fs.statSync(taskDir);
   let actualLoc = findFile(taskDir + "/input");
   let execLoc = findFile(taskDir + "/exec");
@@ -277,6 +250,33 @@ export default function get(entryLoc): Array<Suite> {
   // Delete to avoid option validation error
   delete test.options.validateLogs;
   delete test.options.ignoreOutput;
+}
+
+export default function get(entryLoc): Array<Suite> {
+  const suites = [];
+
+  let rootOpts = {};
+  const rootOptsLoc = tryResolve(entryLoc + "/options");
+  if (rootOptsLoc) rootOpts = require(rootOptsLoc);
+
+  for (const suiteName of fs.readdirSync(entryLoc)) {
+    if (shouldIgnore(suiteName)) continue;
+
+    const suite = {
+      options: clone(rootOpts),
+      tests: [],
+      title: humanize(suiteName),
+      filename: entryLoc + "/" + suiteName,
+    };
+
+    assertDirectory(suite.filename);
+    suites.push(suite);
+
+    const suiteOptsLoc = tryResolve(suite.filename + "/options");
+    if (suiteOptsLoc) suite.options = require(suiteOptsLoc);
+
+    for (const taskName of fs.readdirSync(suite.filename)) {
+      pushTask(taskName, suite.filename + "/" + taskName, suite, suiteName);
     }
   }
 

packages/babel-parser/src/plugins/typescript/index.js

@@ -142,7 +142,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
       modified: { [key: TsModifier]: ?true },
       allowedModifiers: T[],
     ): void {
-      while (true) {
+      for (;;) {
         const startPos = this.state.start;
         const modifier: ?T = this.tsParseModifier(allowedModifiers);
 
@@ -204,7 +204,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
     ): ?(T[]) {
       const result = [];
 
-      while (true) {
+      for (;;) {
         if (this.tsIsListTerminator(kind)) {
           break;
         }

packages/babel-traverse/src/path/comments.js

@@ -20,10 +20,9 @@ export function shareCommentsWithSiblings() {
   const next = this.getSibling(this.key + 1);
   const hasPrev = Boolean(prev.node);
   const hasNext = Boolean(next.node);
-  if (hasPrev && hasNext) {
+  if (hasPrev && !hasNext) {
-  } else if (hasPrev) {
     prev.addComments("trailing", trailing);
-  } else if (hasNext) {
+  } else if (hasNext && !hasPrev) {
     next.addComments("leading", leading);
   }
 }

packages/babel-traverse/src/scope/lib/renamer.js

@@ -62,6 +62,7 @@ export default class Renamer {
 
     // retain the `name` of a class/function declaration
 
+    // eslint-disable-next-line no-unreachable
     if (!path.isFunctionDeclaration() && !path.isClassDeclaration()) return;
     if (this.binding.kind !== "hoisted") return;
 
@@ -83,6 +84,7 @@ export default class Renamer {
 
     // retain the `name` of a class/function expression
 
+    // eslint-disable-next-line no-unreachable
     if (!path.isFunctionExpression() && !path.isClassExpression()) return;
     if (this.binding.kind !== "local") return;