tools: refactor update-authors.js to esm module

.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

@@ -3461,4 +3461,4 @@ 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();
@@ -112,5 +110,5 @@ rl.on('line', (line) => {
 });
 
 rl.on('close', () => {
-  output.end('\n# Generated by tools/update-authors.js\n');
+  output.end('\n# Generated by tools/update-authors.mjs\n');
 });