Function bundleJs

packages/fresh/src/dev/esbuild.ts:34–154

(
  options: FreshBundleOptions,
)

const PREACT_ENV = Deno.env.get("PREACT_PATH");

export async function bundleJs(
  options: FreshBundleOptions,
): Promise<BuildOutput> {
  if (esbuild === null) {
    await startEsbuild();
  }

  try {
    await Deno.mkdir(options.cwd, { recursive: true });
  } catch (err) {
    if (!(err instanceof Deno.errors.AlreadyExists)) {
      throw err;
    }
  }

  const bundle = await esbuild!.build({
    entryPoints: options.entryPoints,

    platform: "browser",
    target: options.target,

    format: "esm",
    bundle: true,
    splitting: true,
    treeShaking: true,
    sourcemap: options.dev ? "linked" : options.sourceMap?.kind,
    sourceRoot: options.dev ? undefined : options.sourceMap?.sourceRoot,
    sourcesContent: options.dev ? undefined : options.sourceMap?.sourcesContent,
    minify: !options.dev,
    logOverride: {
      "suspicious-nullish-coalescing": "silent",
      "unsupported-jsx-comment": "silent",
    },

    jsxDev: options.dev,
    jsx: "automatic",
    jsxImportSource: options.jsxImportSource ?? "preact",

    absWorkingDir: options.cwd,
    outdir: ".",
    write: false,
    metafile: true,

    define: {
      "process.env.NODE_ENV": JSON.stringify(
        options.dev ? "development" : "production",
      ),
    },

    plugins: [
      preactDebugger(PREACT_ENV),
      buildIdPlugin(options.buildId),
      windowsPathFixer(),
      denoPlugin({
        preserveJsx: true,
        debug: false,
        publicEnvVarPrefix: "FRESH_PUBLIC_",
      }),