Improve TypeScript 4.7 NodeNext compatibility (#1721)

* update script to mass-update import/export statements

* rewrite imports on .d.ts files

* add idempotency comment

scripts/build.sh

@@ -46,6 +46,7 @@ wait
 
 # Rewrite ESM imports 😤
 $rewriteImports "$DST" '/**/*.js'
+$rewriteImports "$DST" '/**/*.d.ts'
 
 # Remove test related files
 rm -rf `$resolver "$DST" '/**/*.{test,__mocks__,}.*'`

scripts/rewrite-imports.js

@@ -8,7 +8,15 @@ console.time('Rewrote imports in')
 fastGlob.sync([process.argv.slice(2).join('')]).forEach((file) => {
   file = path.resolve(process.cwd(), file)
   let content = fs.readFileSync(file, 'utf8')
-  let result = content.replace(/(import|export)([^"']*?)(["'])\.(.*?)\3;/g, '$1$2".$4.js";')
+  let result = content.replace(/(import|export)([^"']*?)(["'])\.(.*?)\3/g, (full, a, b, _, d) => {
+    // For idempotency reasons, if `.js` already exists, then we can skip this. This allows us to
+    // run this script over and over again without adding .js files every time.
+    if (d.endsWith('.js')) {
+      return full
+    }
+
+    return `${a}${b}'.${d}.js'`
+  })
   if (result !== content) {
     fs.writeFileSync(file, result, 'utf8')
   }