Enable eqeqeq rule (#16404)

* eqeqeq

* review

* review

Author: liuxingbaoyu

Gulpfile.mjs

@@ -288,7 +288,7 @@ async function buildBabel(useWorker, ignore = []) {
   return Promise.allSettled(promises)
     .then(results => {
       results.forEach(result => {
-        if (result.status == "rejected") {
+        if (result.status === "rejected") {
           if (process.env.WATCH_SKIP_BUILD) {
             console.error(result.reason);
           } else {

Makefile.js

@@ -54,7 +54,7 @@ function exec(executable, args, cwd, inheritStdio = true) {
       env: process.env,
     });
   } catch (error) {
-    if (inheritStdio && error.status != 0) {
+    if (inheritStdio && error.status !== 0) {
       console.error(
         new Error(
           `\ncommand: ${executable} ${args.join(" ")}\ncode: ${error.status}`
@@ -180,7 +180,7 @@ target["bootstrap"] = function () {
 target["build"] = function () {
   target["build-no-bundle"]();
 
-  if (process.env.BABEL_COVERAGE != "true") {
+  if (process.env.BABEL_COVERAGE !== "true") {
     target["build-standalone"]();
   }
 };

Makefile.source.mjs

@@ -1036,7 +1036,7 @@ function pluginGeneratorOptimization({ types: t }) {
               t.isStringLiteral(args[0])
             ) {
               const str = args[0].value;
-              if (str.length == 1) {
+              if (str.length === 1) {
                 node.callee.property.name = "tokenChar";
                 args[0] = t.numericLiteral(str.charCodeAt(0));
               }

babel.config.js

@@ -28,6 +28,7 @@ module.exports = [
     },
     rules: {
       curly: ["error", "multi-line"],
+      eqeqeq: ["error", "smart"],
       "linebreak-style": ["error", "unix"],
       "no-case-declarations": "error",
       "no-confusing-arrow": "error",

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

@@ -53,7 +53,7 @@ export default async function ({
         let outputMap: "both" | "external" | false = false;
         if (babelOptions.sourceMaps && babelOptions.sourceMaps !== "inline") {
           outputMap = "external";
-        } else if (babelOptions.sourceMaps == undefined) {
+        } else if (babelOptions.sourceMaps == null) {
           outputMap = util.hasDataSourcemap(res.code) ? "external" : "both";
         }
 

packages/babel-cli/src/babel/dir.ts

@@ -100,7 +100,7 @@ export default async function ({
       let outputMap: "both" | "external" | false = false;
       if (babelOptions.sourceMaps && babelOptions.sourceMaps !== "inline") {
         outputMap = "external";
-      } else if (babelOptions.sourceMaps == undefined && result.hasRawMap) {
+      } else if (babelOptions.sourceMaps == null && result.hasRawMap) {
         outputMap = util.hasDataSourcemap(result.code) ? "external" : "both";
       }
 

packages/babel-cli/src/babel/file.ts

@@ -362,10 +362,12 @@ function booleanify(val: "true" | 1): true;
 function booleanify(val: any): any {
   if (val === undefined) return undefined;
 
+  // eslint-disable-next-line eqeqeq
   if (val === "true" || val == 1) {
     return true;
   }
 
+  // eslint-disable-next-line eqeqeq
   if (val === "false" || val == 0 || !val) {
     return false;
   }

packages/babel-cli/src/babel/options.ts

@@ -61,7 +61,7 @@ export function addSourceMappingUrl(code: string, loc: string): string {
 
 export function hasDataSourcemap(code: string): boolean {
   const pos = code.lastIndexOf("\n", code.length - 2);
-  return pos != -1 && code.lastIndexOf("//# sourceMappingURL") < pos;
+  return pos !== -1 && code.lastIndexOf("//# sourceMappingURL") < pos;
 }
 
 const CALLER = {

packages/babel-cli/src/babel/util.ts

@@ -661,7 +661,7 @@ class Printer {
     this._printStack.push(node);
 
     const oldInAux = this._insideAux;
-    this._insideAux = node.loc == undefined;
+    this._insideAux = node.loc == null;
     this._maybeAddAuxComment(this._insideAux && !oldInAux);
 
     const parenthesized = node.extra?.parenthesized as boolean | undefined;
@@ -1128,7 +1128,7 @@ class Printer {
             if (
               this._buf.hasContent() &&
               (comment.type === "CommentLine" ||
-                commentStartLine != commentEndLine)
+                commentStartLine !== commentEndLine)
             ) {
               offset = leadingCommentNewline = 1;
             }

packages/babel-generator/src/printer.ts

@@ -97,7 +97,7 @@ if (!process.env.BABEL_8_BREAKING) {
         !path.isCompletionRecord()
       ) {
         // ++i => (i += 1);
-        const operator = path.node.operator == "++" ? "+=" : "-=";
+        const operator = path.node.operator === "++" ? "+=" : "-=";
         path.replaceWith(
           assignmentExpression(operator, arg.node, numericLiteral(1)),
         );

packages/babel-helper-simple-access/src/index.ts

@@ -13,7 +13,7 @@ let last = -1;
 const cont = require(
   "@unicode/unicode-" + version + "/Binary_Property/ID_Continue/code-points.js"
 ).filter(function (ch) {
-  return ch > 0x7f && search(start, ch, last + 1) == -1;
+  return ch > 0x7f && search(start, ch, last + 1) === -1;
 });
 
 function search(arr, ch, starting) {
@@ -40,13 +40,13 @@ function generate(chars) {
   for (let i = 0, at = 0x10000; i < chars.length; i++) {
     const from = chars[i];
     let to = from;
-    while (i < chars.length - 1 && chars[i + 1] == to + 1) {
+    while (i < chars.length - 1 && chars[i + 1] === to + 1) {
       i++;
       to++;
     }
     if (to <= 0xffff) {
-      if (from == to) re += esc(from);
-      else if (from + 1 == to) re += esc(from) + esc(to);
+      if (from === to) re += esc(from);
+      else if (from + 1 === to) re += esc(from) + esc(to);
       else re += esc(from) + "-" + esc(to);
     } else {
       astral.push(from - at, to - from);

packages/babel-helper-validator-identifier/scripts/generate-identifier-regex.js

@@ -523,9 +523,10 @@ export default /* @no-mangle */ function applyDecs2311(
         var kind = decInfo[1];
         var kindOnly: PROP_KIND = kind & PROP_KIND.KIND_MASK;
         if (
-          // eslint-disable-next-line @typescript-eslint/no-unsafe-enum-comparison
+          // eslint-disable-next-line @typescript-eslint/no-unsafe-enum-comparison, eqeqeq
           (kind & PROP_KIND.STATIC) == isStatic &&
           // @ts-expect-error comparing a boolean with 0 | 1
+          // eslint-disable-next-line eqeqeq
           !kindOnly == isField
         ) {
           var name = decInfo[2];

packages/babel-helpers/src/helpers/applyDecs2311.ts

@@ -189,7 +189,7 @@ if (process.env.BABEL_8_BREAKING) {
 
       if (
         JSX_TAG.test(token.value) &&
-        (text[offset - 1] === "<" || text.slice(offset - 2, offset) == "</")
+        (text[offset - 1] === "<" || text.slice(offset - 2, offset) === "</")
       ) {
         return "jsxIdentifier";
       }

packages/babel-highlight/src/index.ts

@@ -103,7 +103,9 @@ export default class CommentsParser extends BaseParser {
   addComment(comment: Comment): void {
     if (this.filename) comment.loc.filename = this.filename;
     const { commentsLen } = this.state;
-    if (this.comments.length != commentsLen) this.comments.length = commentsLen;
+    if (this.comments.length !== commentsLen) {
+      this.comments.length = commentsLen;
+    }
     this.comments.push(comment);
     this.state.commentsLen++;
   }

packages/babel-parser/src/parser/comments.ts

@@ -221,7 +221,7 @@ export default (superClass: typeof Parser) =>
         while (
           count++ < 10 &&
           this.state.pos < this.length &&
-          !(semi = this.codePointAtPos(this.state.pos) == charCodes.semicolon)
+          !(semi = this.codePointAtPos(this.state.pos) === charCodes.semicolon)
         ) {
           ++this.state.pos;
         }

packages/babel-parser/src/plugins/jsx/index.ts

@@ -36,7 +36,7 @@ export default class TypeScriptScopeHandler extends ScopeHandler<TypeScriptScope
   }
 
   enter(flags: ScopeFlag): void {
-    if (flags == ScopeFlag.TS_MODULE) {
+    if (flags === ScopeFlag.TS_MODULE) {
       this.importsStack.push(new Set());
     }
 
@@ -46,7 +46,7 @@ export default class TypeScriptScopeHandler extends ScopeHandler<TypeScriptScope
   exit() {
     const flags = super.exit();
 
-    if (flags == ScopeFlag.TS_MODULE) {
+    if (flags === ScopeFlag.TS_MODULE) {
       this.importsStack.pop();
     }
 

packages/babel-parser/src/plugins/typescript/scope.ts

@@ -478,7 +478,7 @@ export default function transformClass(
       });
 
       if (
-        maxGuaranteedSuperBeforeIndex != -1 &&
+        maxGuaranteedSuperBeforeIndex !== -1 &&
         thisIndex > maxGuaranteedSuperBeforeIndex
       ) {
         thisPath.replaceWith(thisRef());

packages/babel-plugin-transform-classes/src/transformClass.ts

@@ -397,7 +397,7 @@ function _evaluate(path: NodePath, state: State): any {
       case "==":
         return left == right; // eslint-disable-line eqeqeq
       case "!=":
-        return left != right;
+        return left != right; // eslint-disable-line eqeqeq
       case "===":
         return left === right;
       case "!==":

packages/babel-traverse/src/path/evaluation.ts

@@ -22,7 +22,7 @@ async function pack(inputPath, outputPath, dynamicRequireTargets) {
     .update(readFileSync(inputPath, "utf8"))
     .digest("hex");
 
-  if (process.argv[2] == "--auto") {
+  if (process.argv[2] === "--auto") {
     if (readFileSync(outputPath, "utf8").includes(hash)) {
       return;
     }