refactor(build): use shared esbuild plugin for Unicode transforms

- Create shared esbuild-plugin-unicode-transform in build-infra package
- Use plugin in bootstrap (npm and smol) and CLI builds
- Remove unused babel.config.js from CLI package
- Remove inline Unicode transform from smol-transform plugin

Reduces code duplication and centralizes Unicode property escape
transformations for --with-intl=none compatibility.

Author: jdalton

packages/bootstrap/.config/esbuild-plugin-smol-transform.mjs

@@ -5,8 +5,6 @@
  * for smol builds.
  */
 
-import { transformUnicodePropertyEscapes } from '@socketsecurity/build-infra/lib/unicode-property-escape-transform'
-
 /**
  * Create smol transformation plugin.
  * @returns {import('esbuild').Plugin}
@@ -119,10 +117,6 @@ export function smolTransformPlugin() {
             }
           }
 
-          // Transform Unicode property escapes for --with-intl=none compatibility.
-          // This is CRITICAL for smol builds which disable ICU to save 6-8MB.
-          content = transformUnicodePropertyEscapes(content)
-
           // Update the output content.
           output.contents = Buffer.from(content, 'utf8')
         }

packages/bootstrap/.config/esbuild.npm.config.mjs

@@ -8,6 +8,8 @@ import { fileURLToPath } from 'node:url'
 
 import { build } from 'esbuild'
 
+import { unicodeTransformPlugin } from '@socketsecurity/build-infra/lib/esbuild-plugin-unicode-transform'
+
 import nodeVersionConfig from '../node-version.json' with { type: 'json' }
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url))
@@ -28,8 +30,10 @@ const config = {
   minify: true,
   outfile: path.join(rootPath, 'dist', 'bootstrap-npm.js'),
   platform: 'node',
+  plugins: [unicodeTransformPlugin()],
   target: 'node18',
   treeShaking: true,
+  write: false, // Plugin needs to transform output.
 }
 
 // Run build if invoked directly.

packages/bootstrap/.config/esbuild.smol.config.mjs

@@ -8,6 +8,8 @@ import { fileURLToPath } from 'node:url'
 
 import { build } from 'esbuild'
 
+import { unicodeTransformPlugin } from '@socketsecurity/build-infra/lib/esbuild-plugin-unicode-transform'
+
 import nodeVersionConfig from '../node-version.json' with { type: 'json' }
 
 import { smolTransformPlugin } from './esbuild-plugin-smol-transform.mjs'
@@ -30,7 +32,7 @@ const config = {
   minify: true,
   outfile: path.join(rootPath, 'dist', 'bootstrap-smol.js'),
   platform: 'node',
-  plugins: [smolTransformPlugin()],
+  plugins: [unicodeTransformPlugin(), smolTransformPlugin()],
   target: 'node24',
   treeShaking: true,
   write: false, // Plugin needs to transform output.

packages/build-infra/lib/esbuild-plugin-unicode-transform.mjs

@@ -0,0 +1,44 @@
+/**
+ * @fileoverview Shared esbuild plugin for Unicode property escape transformations.
+ *
+ * This plugin applies Unicode property escape transformations to esbuild output
+ * for --with-intl=none compatibility. Used by both CLI and bootstrap builds.
+ *
+ * @example
+ * import { unicodeTransformPlugin } from '@socketsecurity/build-infra/lib/esbuild-plugin-unicode-transform'
+ *
+ * export default {
+ *   plugins: [unicodeTransformPlugin()],
+ * }
+ */
+
+import { transformUnicodePropertyEscapes } from './unicode-property-escape-transform.mjs'
+
+/**
+ * Create esbuild plugin for Unicode property escape transformations.
+ *
+ * @returns {import('esbuild').Plugin} esbuild plugin
+ */
+export function unicodeTransformPlugin() {
+  return {
+    name: 'unicode-transform',
+    setup(build) {
+      build.onEnd((result) => {
+        const outputs = result.outputFiles
+        if (!outputs || outputs.length === 0) {
+          return
+        }
+
+        for (const output of outputs) {
+          let content = output.text
+
+          // Transform Unicode property escapes for --with-intl=none compatibility.
+          content = transformUnicodePropertyEscapes(content)
+
+          // Update the output content.
+          output.contents = Buffer.from(content, 'utf8')
+        }
+      })
+    },
+  }
+}

packages/build-infra/package.json

@@ -11,6 +11,7 @@
     "./lib/checkpoint-manager": "./lib/checkpoint-manager.mjs",
     "./lib/cmake-builder": "./lib/cmake-builder.mjs",
     "./lib/emscripten-builder": "./lib/emscripten-builder.mjs",
+    "./lib/esbuild-plugin-unicode-transform": "./lib/esbuild-plugin-unicode-transform.mjs",
     "./lib/extraction-cache": "./lib/extraction-cache.mjs",
     "./lib/fetch-with-retry": "./lib/fetch-with-retry.mjs",
     "./lib/patch-validator": "./lib/patch-validator.mjs",

packages/cli/.config/babel.config.js

@@ -11,6 +11,8 @@ import { existsSync, readFileSync } from 'node:fs'
 import path from 'node:path'
 import { fileURLToPath } from 'node:url'
 
+import { unicodeTransformPlugin } from '@socketsecurity/build-infra/lib/esbuild-plugin-unicode-transform'
+
 import { getLocalPackageAliases } from '../scripts/utils/get-local-package-aliases.mjs'
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url))
@@ -133,6 +135,9 @@ const config = {
   // Keep names for better stack traces.
   keepNames: true,
 
+  // Plugin needs to transform output.
+  write: false,
+
   // Define environment variables and import.meta.
   define: {
     'process.env.NODE_ENV': '"production"',
@@ -173,6 +178,7 @@ const config = {
 
   // Handle special cases with plugins.
   plugins: [
+    unicodeTransformPlugin(),
     {
       name: 'resolve-socket-packages',
       setup(build) {