tools: refactor update-authors.js to ESM

PR-URL: #43098
Reviewed-By: Antoine du Hamel <[email protected]>

.github/workflows/authors.yml

@@ -15,7 +15,7 @@ jobs:
         with:
           fetch-depth: '0'  # This is required to actually get all the authors
           persist-credentials: false
-      - run: tools/update-authors.js  # Run the AUTHORS tool
+      - run: tools/update-authors.mjs  # Run the AUTHORS tool
       - uses: gr2m/create-or-update-pull-request-action@v1  # Create a PR or update the Action's existing PR
         env:
           GITHUB_TOKEN: ${{ secrets.GH_USER_TOKEN }}
@@ -24,7 +24,7 @@ jobs:
           body: >
             Here are some new additions to the AUTHORS file.
             This is an automatically generated PR by the
-            `authors.yml` GitHub Action, which runs `tools/update-authors.js`.
+            `authors.yml` GitHub Action, which runs `tools/update-authors.mjs`.
           branch: actions/authors-update  # Custom branch *just* for this Action.
           commit-message: 'meta: update AUTHORS'
           labels: meta

AUTHORS

@@ -3460,4 +3460,4 @@ William Marlow <[email protected]>
 Keyhan Vakil <[email protected]>
 Feng Yu <[email protected]>
 
-# Generated by tools/update-authors.js
+# Generated by tools/update-authors.mjs

tools/update-authors.js → tools/update-authors.mjs

@@ -1,11 +1,9 @@
 #!/usr/bin/env node
-// Usage: tools/update-author.js [--dry]
+// Usage: tools/update-author.mjs [--dry]
 // Passing --dry will redirect output to stdout rather than write to 'AUTHORS'.
-'use strict';
-const { spawn } = require('child_process');
-const path = require('path');
-const fs = require('fs');
-const readline = require('readline');
+import { spawn } from 'node:child_process';
+import fs from 'node:fs';
+import readline from 'node:readline';
 
 class CaseIndifferentMap {
   _map = new Map();
@@ -33,7 +31,7 @@ output.write('# Authors ordered by first contribution.\n\n');
 
 const mailmap = new CaseIndifferentMap();
 {
-  const lines = fs.readFileSync(path.resolve(__dirname, '../', '.mailmap'),
+  const lines = fs.readFileSync(new URL('../.mailmap', import.meta.url),
                                 { encoding: 'utf8' }).split('\n');
   for (let line of lines) {
     line = line.trim();
@@ -55,7 +53,7 @@ const mailmap = new CaseIndifferentMap();
 
 const previousAuthors = new CaseIndifferentMap();
 {
-  const lines = fs.readFileSync(path.resolve(__dirname, '../', 'AUTHORS'),
+  const lines = fs.readFileSync(new URL('../AUTHORS', import.meta.url),
                                 { encoding: 'utf8' }).split('\n');
   for (let line of lines) {
     line = line.trim();
@@ -85,9 +83,9 @@ const seen = new Set();
 // by GitHub now.
 const authorRe =
   /(^Author:|^Co-authored-by:)\s+(?<author>[^<]+)\s+(?<email><[^>]+>)/i;
-rl.on('line', (line) => {
+for await (const line of rl) {
   const match = line.match(authorRe);
-  if (!match) return;
+  if (!match) continue;
 
   let { author, email } = match.groups;
   const emailLower = email.toLowerCase();
@@ -99,7 +97,7 @@ rl.on('line', (line) => {
   }
 
   if (seen.has(email)) {
-    return;
+    continue;
   }
 
   seen.add(email);
@@ -109,8 +107,6 @@ rl.on('line', (line) => {
     console.warn('Author name already in AUTHORS file. Possible duplicate:');
     console.warn(`  ${author} ${email}`);
   }
-});
+}
 
-rl.on('close', () => {
-  output.end('\n# Generated by tools/update-authors.js\n');
-});
+output.end('\n# Generated by tools/update-authors.mjs\n');