claude-code

scripts/build-bundle.ts

@@ -0,0 +1,197 @@
+// scripts/build-bundle.ts
+// Usage: bun scripts/build-bundle.ts [--watch] [--minify] [--no-sourcemap]
+//
+// Production build: bun scripts/build-bundle.ts --minify
+// Dev build:        bun scripts/build-bundle.ts
+// Watch mode:       bun scripts/build-bundle.ts --watch
+
+import * as esbuild from 'esbuild'
+import { resolve, dirname } from 'path'
+import { chmodSync, readFileSync, existsSync } from 'fs'
+import { fileURLToPath } from 'url'
+
+// Bun: import.meta.dir — Node 21+: import.meta.dirname — fallback
+const __dir: string =
+  (import.meta as any).dir ??
+  (import.meta as any).dirname ??
+  dirname(fileURLToPath(import.meta.url))
+
+const ROOT = resolve(__dir, '..')
+const watch = process.argv.includes('--watch')
+const minify = process.argv.includes('--minify')
+const noSourcemap = process.argv.includes('--no-sourcemap')
+
+// Read version from package.json for MACRO injection
+const pkg = JSON.parse(readFileSync(resolve(ROOT, 'package.json'), 'utf-8'))
+const version = pkg.version || '0.0.0-dev'
+
+// ── Plugin: resolve bare 'src/' imports (tsconfig baseUrl: ".") ──
+// The codebase uses `import ... from 'src/foo/bar.js'` which relies on
+// TypeScript's baseUrl resolution. This plugin maps those to real TS files.
+const srcResolverPlugin: esbuild.Plugin = {
+  name: 'src-resolver',
+  setup(build) {
+    build.onResolve({ filter: /^src\// }, (args) => {
+      const basePath = resolve(ROOT, args.path)
+
+      // Already exists as-is
+      if (existsSync(basePath)) {
+        return { path: basePath }
+      }
+
+      // Strip .js/.jsx and try TypeScript extensions
+      const withoutExt = basePath.replace(/\.(js|jsx)$/, '')
+      for (const ext of ['.ts', '.tsx', '.js', '.jsx']) {
+        const candidate = withoutExt + ext
+        if (existsSync(candidate)) {
+          return { path: candidate }
+        }
+      }
+
+      // Try as directory with index file
+      const dirPath = basePath.replace(/\.(js|jsx)$/, '')
+      for (const ext of ['.ts', '.tsx', '.js', '.jsx']) {
+        const candidate = resolve(dirPath, 'index' + ext)
+        if (existsSync(candidate)) {
+          return { path: candidate }
+        }
+      }
+
+      // Let esbuild handle it (will error if truly missing)
+      return undefined
+    })
+  },
+}
+
+const buildOptions: esbuild.BuildOptions = {
+  entryPoints: [resolve(ROOT, 'src/entrypoints/cli.tsx')],
+  bundle: true,
+  platform: 'node',
+  target: ['node20', 'es2022'],
+  format: 'esm',
+  outdir: resolve(ROOT, 'dist'),
+  outExtension: { '.js': '.mjs' },
+
+  // Single-file output — no code splitting for CLI tools
+  splitting: false,
+
+  plugins: [srcResolverPlugin],
+
+  // Use tsconfig for baseUrl / paths resolution (complements plugin above)
+  tsconfig: resolve(ROOT, 'tsconfig.json'),
+
+  // Alias bun:bundle to our runtime shim
+  alias: {
+    'bun:bundle': resolve(ROOT, 'src/shims/bun-bundle.ts'),
+  },
+
+  // Don't bundle node built-ins or problematic native packages
+  external: [
+    // Node built-ins (with and without node: prefix)
+    'fs', 'path', 'os', 'crypto', 'child_process', 'http', 'https',
+    'net', 'tls', 'url', 'util', 'stream', 'events', 'buffer',
+    'querystring', 'readline', 'zlib', 'assert', 'tty', 'worker_threads',
+    'perf_hooks', 'async_hooks', 'dns', 'dgram', 'cluster',
+    'string_decoder', 'module', 'vm', 'constants', 'domain',
+    'console', 'process', 'v8', 'inspector',
+    'node:*',
+    // Native addons that can't be bundled
+    'fsevents',
+    'sharp',
+    'image-processor-napi',
+    // Anthropic-internal packages (not published externally)
+    '@anthropic-ai/sandbox-runtime',
+    '@anthropic-ai/claude-agent-sdk',
+    // Anthropic-internal (@ant/) packages — gated behind USER_TYPE === 'ant'
+    '@ant/*',
+  ],
+
+  jsx: 'automatic',
+
+  // Source maps for production debugging (external .map files)
+  sourcemap: noSourcemap ? false : 'external',
+
+  // Minification for production
+  minify,
+
+  // Tree shaking (on by default, explicit for clarity)
+  treeShaking: true,
+
+  // Define replacements — inline constants at build time
+  // MACRO.* — originally inlined by Bun's bundler at compile time
+  // process.env.USER_TYPE — eliminates 'ant' (Anthropic-internal) code branches
+  define: {
+    'MACRO.VERSION': JSON.stringify(version),
+    'MACRO.PACKAGE_URL': JSON.stringify('@anthropic-ai/claude-code'),
+    'MACRO.ISSUES_EXPLAINER': JSON.stringify(
+      'report issues at https://github.com/anthropics/claude-code/issues'
+    ),
+    'process.env.USER_TYPE': '"external"',
+    'process.env.NODE_ENV': minify ? '"production"' : '"development"',
+  },
+
+  // Banner: shebang for direct CLI execution
+  banner: {
+    js: '#!/usr/bin/env node\n',
+  },
+
+  // Handle the .js → .ts resolution that the codebase uses
+  resolveExtensions: ['.tsx', '.ts', '.jsx', '.js', '.json'],
+
+  logLevel: 'info',
+
+  // Metafile for bundle analysis
+  metafile: true,
+}
+
+async function main() {
+  if (watch) {
+    const ctx = await esbuild.context(buildOptions)
+    await ctx.watch()
+    console.log('Watching for changes...')
+  } else {
+    const startTime = Date.now()
+    const result = await esbuild.build(buildOptions)
+
+    if (result.errors.length > 0) {
+      console.error('Build failed')
+      process.exit(1)
+    }
+
+    // Make the output executable
+    const outPath = resolve(ROOT, 'dist/cli.mjs')
+    try {
+      chmodSync(outPath, 0o755)
+    } catch {
+      // chmod may fail on some platforms, non-fatal
+    }
+
+    const elapsed = Date.now() - startTime
+
+    // Print bundle size info
+    if (result.metafile) {
+      const text = await esbuild.analyzeMetafile(result.metafile, { verbose: false })
+      const outFiles = Object.entries(result.metafile.outputs)
+      for (const [file, info] of outFiles) {
+        if (file.endsWith('.mjs')) {
+          const sizeMB = ((info as { bytes: number }).bytes / 1024 / 1024).toFixed(2)
+          console.log(`\n  ${file}: ${sizeMB} MB`)
+        }
+      }
+      console.log(`\nBuild complete in ${elapsed}ms → dist/`)
+
+      // Write metafile for further analysis
+      const { writeFileSync } = await import('fs')
+      writeFileSync(
+        resolve(ROOT, 'dist/meta.json'),
+        JSON.stringify(result.metafile),
+      )
+      console.log('  Metafile written to dist/meta.json')
+    }
+  }
+}
+
+main().catch(err => {
+  console.error(err)
+  process.exit(1)
+})