From 7fd6c2036d8123ffd187bdaa1a039c7b1eb1fd86 Mon Sep 17 00:00:00 2001
From: Antoine du Hamel <duhamelantoine1995@gmail.com>
Date: Sat, 7 Nov 2020 17:29:12 +0100
Subject: [PATCH] tools: refactor prefer-primordials

Use optional chaining to improve code readability and remove use of
`Array.prototype.reduce`.

PR-URL: https://github.com/nodejs/node/pull/36018
Reviewed-By: Shingo Inoue <leko.noor@gmail.com>
---
 .../test-eslint-prefer-primordials.js         |  4 +-
 tools/eslint-rules/prefer-primordials.js      | 40 +++++++++----------
 2 files changed, 21 insertions(+), 23 deletions(-)

diff --git a/test/parallel/test-eslint-prefer-primordials.js b/test/parallel/test-eslint-prefer-primordials.js
index 2d04f9a1081c56..143ddd2b0d118f 100644
--- a/test/parallel/test-eslint-prefer-primordials.js
+++ b/test/parallel/test-eslint-prefer-primordials.js
@@ -66,7 +66,7 @@ new RuleTester({
       },
       {
         code: 'const { NumberParseInt } = primordials; NumberParseInt("xxx")',
-        options: [{ name: 'parseInt' }]
+        options: [{ name: 'parseInt', into: 'Number' }]
       },
       {
         code: `
@@ -141,7 +141,7 @@ new RuleTester({
           const { Number } = primordials;
           Number.parseInt('10')
         `,
-        options: [{ name: 'Number', into: Number }],
+        options: [{ name: 'Number' }],
         errors: [{ message: /const { NumberParseInt } = primordials/ }]
       },
       {
diff --git a/tools/eslint-rules/prefer-primordials.js b/tools/eslint-rules/prefer-primordials.js
index 51fb6ab8c2ad44..02b00a7e3b1f12 100644
--- a/tools/eslint-rules/prefer-primordials.js
+++ b/tools/eslint-rules/prefer-primordials.js
@@ -23,10 +23,7 @@ function isTarget(map, varName) {
 }
 
 function isIgnored(map, varName, propName) {
-  if (!map.has(varName) || !map.get(varName).has(propName)) {
-    return false;
-  }
-  return map.get(varName).get(propName).ignored;
+  return map.get(varName)?.get(propName)?.ignored ?? false;
 }
 
 function getReportName({ name, parentName, into }) {
@@ -71,25 +68,26 @@ module.exports = {
   },
   create(context) {
     const globalScope = context.getSourceCode().scopeManager.globalScope;
-    const nameMap = context.options.reduce((acc, option) =>
-      acc.set(
+
+    const nameMap = new Map();
+    const renameMap = new Map();
+
+    for (const option of context.options) {
+      const names = option.ignore || [];
+      nameMap.set(
         option.name,
-        (option.ignore || [])
-          .reduce((acc, name) => acc.set(name, {
-            ignored: true
-          }), new Map())
-      )
-    , new Map());
-    const renameMap = context.options
-      .filter((option) => option.into)
-      .reduce((acc, option) =>
-        acc.set(option.name, option.into)
-      , new Map());
+        new Map(names.map((name) => [name, { ignored: true }]))
+      );
+      if (option.into) {
+        renameMap.set(option.name, option.into);
+      }
+    }
+
     let reported;
 
     return {
       Program() {
-        reported = new Map();
+        reported = new Set();
       },
       [identifierSelector](node) {
         if (reported.has(node.range[0])) {
@@ -104,10 +102,10 @@ module.exports = {
           return;
         }
 
-        const defs = (globalScope.set.get(name) || {}).defs || null;
+        const defs = globalScope.set.get(name)?.defs;
         if (parentName && isTarget(nameMap, parentName)) {
           if (!defs || defs[0].name.name !== 'primordials') {
-            reported.set(node.range[0], true);
+            reported.add(node.range[0]);
             const into = renameMap.get(name);
             context.report({
               node,
@@ -120,7 +118,7 @@ module.exports = {
           return;
         }
         if (defs.length === 0 || defs[0].node.init.name !== 'primordials') {
-          reported.set(node.range[0], true);
+          reported.add(node.range[0]);
           const into = renameMap.get(name);
           context.report({
             node,