private createBundlingCommand()

in packages/aws-cdk-lib/aws-lambda-nodejs/lib/bundling.ts [215:305]
76 lines of code
26 McCabe index (conditional complexity)

  private createBundlingCommand(options: BundlingCommandOptions): string {
    const pathJoin = osPathJoin(options.osPlatform);
    let relativeEntryPath = pathJoin(options.inputDir, this.relativeEntryPath);
    let tscCommand = '';

    if (this.props.preCompilation) {
      const tsconfig = this.props.tsconfig ?? findUp('tsconfig.json', path.dirname(this.props.entry));
      if (!tsconfig) {
        throw new Error('Cannot find a `tsconfig.json` but `preCompilation` is set to `true`, please specify it via `tsconfig`');
      }
      const compilerOptions = getTsconfigCompilerOptions(tsconfig);
      tscCommand = `${options.tscRunner} "${relativeEntryPath}" ${compilerOptions}`;
      relativeEntryPath = relativeEntryPath.replace(/\.ts(x?)$/, '.js$1');
    }

    const loaders = Object.entries(this.props.loader ?? {});
    const defines = Object.entries(this.props.define ?? {});

    if (this.props.sourceMap === false && this.props.sourceMapMode) {
      throw new Error('sourceMapMode cannot be used when sourceMap is false');
    }

    const sourceMapEnabled = this.props.sourceMapMode ?? this.props.sourceMap;
    const sourceMapMode = this.props.sourceMapMode ?? SourceMapMode.DEFAULT;
    const sourceMapValue = sourceMapMode === SourceMapMode.DEFAULT ? '' : `=${this.props.sourceMapMode}`;
    const sourcesContent = this.props.sourcesContent ?? true;

    const outFile = this.props.format === OutputFormat.ESM ? 'index.mjs' : 'index.js';
    const esbuildCommand: string[] = [
      options.esbuildRunner,
      '--bundle', `"${relativeEntryPath}"`,
      `--target=${this.props.target ?? toTarget(this.props.runtime)}`,
      '--platform=node',
      ...this.props.format ? [`--format=${this.props.format}`] : [],
      `--outfile="${pathJoin(options.outputDir, outFile)}"`,
      ...this.props.minify ? ['--minify'] : [],
      ...sourceMapEnabled ? [`--sourcemap${sourceMapValue}`] : [],
      ...sourcesContent ? [] : [`--sources-content=${sourcesContent}`],
      ...this.externals.map(external => `--external:${external}`),
      ...loaders.map(([ext, name]) => `--loader:${ext}=${name}`),
      ...defines.map(([key, value]) => `--define:${key}=${JSON.stringify(value)}`),
      ...this.props.logLevel ? [`--log-level=${this.props.logLevel}`] : [],
      ...this.props.keepNames ? ['--keep-names'] : [],
      ...this.relativeTsconfigPath ? [`--tsconfig="${pathJoin(options.inputDir, this.relativeTsconfigPath)}"`] : [],
      ...this.props.metafile ? [`--metafile="${pathJoin(options.outputDir, 'index.meta.json')}"`] : [],
      ...this.props.banner ? [`--banner:js=${JSON.stringify(this.props.banner)}`] : [],
      ...this.props.footer ? [`--footer:js=${JSON.stringify(this.props.footer)}`] : [],
      ...this.props.mainFields ? [`--main-fields=${this.props.mainFields.join(',')}`] : [],
      ...this.props.inject ? this.props.inject.map(i => `--inject:"${i}"`) : [],
      ...this.props.esbuildArgs ? [toCliArgs(this.props.esbuildArgs)] : [],
    ];

    let depsCommand = '';
    if (this.props.nodeModules) {
      // Find 'package.json' closest to entry folder, we are going to extract the
      // modules versions from it.
      const pkgPath = findUp('package.json', path.dirname(this.props.entry));
      if (!pkgPath) {
        throw new Error('Cannot find a `package.json` in this project. Using `nodeModules` requires a `package.json`.');
      }

      // Determine dependencies versions, lock file and installer
      const dependencies = extractDependencies(pkgPath, this.props.nodeModules);
      const osCommand = new OsCommand(options.osPlatform);

      const lockFilePath = pathJoin(options.inputDir, this.relativeDepsLockFilePath ?? this.packageManager.lockFile);

      const isPnpm = this.packageManager.lockFile === LockFile.PNPM;
      const isBun = this.packageManager.lockFile === LockFile.BUN;

      // Create dummy package.json, copy lock file if any and then install
      depsCommand = chain([
        isPnpm ? osCommand.write(pathJoin(options.outputDir, 'pnpm-workspace.yaml'), ''): '', // Ensure node_modules directory is installed locally by creating local 'pnpm-workspace.yaml' file
        osCommand.writeJson(pathJoin(options.outputDir, 'package.json'), { dependencies }),
        osCommand.copy(lockFilePath, pathJoin(options.outputDir, this.packageManager.lockFile)),
        osCommand.changeDirectory(options.outputDir),
        this.packageManager.installCommand.join(' '),
        isPnpm ? osCommand.remove(pathJoin(options.outputDir, 'node_modules', '.modules.yaml'), true) : '', // Remove '.modules.yaml' file which changes on each deployment
        isBun ? osCommand.removeDir(pathJoin(options.outputDir, 'node_modules', '.cache')) : '', // Remove node_modules/.cache folder since you can't disable its creation
      ]);
    }

    return chain([
      ...this.props.commandHooks?.beforeBundling(options.inputDir, options.outputDir) ?? [],
      tscCommand,
      esbuildCommand.join(' '),
      ...(this.props.nodeModules && this.props.commandHooks?.beforeInstall(options.inputDir, options.outputDir)) ?? [],
      depsCommand,
      ...this.props.commandHooks?.afterBundling(options.inputDir, options.outputDir) ?? [],
    ]);
  }