build: auto-generate the browserify step GN inputs (#17626)

script/gen-filenames.js

@@ -1,6 +1,9 @@
-const fs = require('fs')
+const cp = require('child_process')
+const fs = require('fs-extra')
+const os = require('os')
 const path = require('path')
 
+const rootPath = path.resolve(__dirname, '..')
 const gniPath = path.resolve(__dirname, '../filenames.auto.gni')
 
 const allDocs = fs.readdirSync(path.resolve(__dirname, '../docs/api'))
@@ -10,13 +13,92 @@ const allDocs = fs.readdirSync(path.resolve(__dirname, '../docs/api'))
       .map(doc => `docs/api/structures/${doc}`)
   )
 
-fs.writeFileSync(
-  gniPath,
-  `# THIS FILE IS AUTO-GENERATED, PLEASE DO NOT EDIT BY HAND
+const main = async () => {
+  const browserifyTargets = [
+    {
+      name: 'sandbox_browserify_deps',
+      entry: 'lib/sandboxed_renderer/init.js'
+    },
+    {
+      name: 'isolated_browserify_deps',
+      entry: 'lib/isolated_renderer/init.js'
+    },
+    {
+      name: 'context_script_browserify_deps',
+      entry: 'lib/content_script/init.js'
+    }
+  ]
+
+  await Promise.all(browserifyTargets.map(async browserifyTarget => {
+    const tmpDir = await fs.mkdtemp(path.resolve(os.tmpdir(), 'electron-filenames-'))
+    const child = cp.spawn('node', [
+      'node_modules/browserify/bin/cmd.js',
+      browserifyTarget.entry,
+      ...(browserifyTarget.name === 'sandbox_browserify_deps' ? [
+        '-r',
+        './lib/sandboxed_renderer/api/exports/electron.js:electron'
+      ] : []),
+      '-t',
+      'aliasify',
+      '-p',
+      '[',
+      'tsify',
+      '-p',
+      'tsconfig.electron.json',
+      ']',
+      '-o',
+      path.resolve(tmpDir, 'out.js'),
+      '--list'
+    ], {
+      cwd: path.resolve(__dirname, '..')
+    })
+    let output = ''
+    child.stdout.on('data', chunk => {
+      output += chunk.toString()
+    })
+    await new Promise((resolve, reject) => child.on('exit', (code) => {
+      if (code !== 0) return reject(new Error(`Failed to list browserify dependencies for entry: ${browserifyTarget.name}`))
+
+      resolve()
+    }))
+
+    browserifyTarget.dependencies = output
+      .split('\n')
+      // Remove whitespace
+      .map(line => line.trim())
+      // Ignore empty lines
+      .filter(line => line)
+      // Get the relative path
+      .map(line => path.relative(rootPath, line))
+      // Only care about files in //electron
+      .filter(line => !line.startsWith('..'))
+      // Only care about our own files
+      .filter(line => !line.startsWith('node_modules'))
+      // Make the generated list easier to read
+      .sort()
+      // All browserify commands depend on the tsconfig  and package json files
+      .concat(['tsconfig.json', 'tsconfig.electron.json', 'package.json'])
+    await fs.remove(tmpDir)
+  }))
+
+  fs.writeFileSync(
+    gniPath,
+    `# THIS FILE IS AUTO-GENERATED, PLEASE DO NOT EDIT BY HAND
 auto_filenames = {
   api_docs = [
 ${allDocs.map(doc => `    "${doc}",`).join('\n')}
   ]
+
+${browserifyTargets.map(target => `  ${target.name} = [
+${target.dependencies.map(dep => `    "${dep}",`).join('\n')}
+  ]`).join('\n\n')}
+}
+`)
+}
+
+if (process.mainModule === module) {
+  main().catch((err) => {
+    console.error(err)
+    process.exit(1)
+  })
 }
-`
-)