Runtime Helper Transpilation Toolkit

A small tool that compiles JavaScript code while delegating helper functions to a shared runtime library, and can emit an external helpers bundle for script-tag usage.

Capabilities

Shared helper imports for modern features

• Transpiling an async function includes imports from a shared runtime helper library instead of inline helper definitions, and no helper bodies appear in the output. @test
• Transpiling two separate modules that use the same feature results in identical helper import statements per file without duplicated inline helper definitions. @test

Configurable module format

• When requesting CommonJS output, helper access uses require-based runtime imports; when requesting ESM output, helper access uses import statements. @test

External helpers bundle

• Generating an external helpers bundle for given feature names returns a single script string that defines helpers only once and exposes them under a chosen global name. @test

Implementation

@generates

API

export type ModuleFormat = "esm" | "cjs";

export interface TranspileOptions {
  filename?: string;
  format?: ModuleFormat;
  sourceMaps?: boolean;
}

export interface TranspileResult {
  code: string;
  map?: object;
  helpers: string[];
}

export function transpileWithRuntime(source: string, options?: TranspileOptions): Promise<TranspileResult>;

export function transpileBatch(sources: Record<string, string>, options?: TranspileOptions): Promise<Record<string, TranspileResult>>;

export interface ExternalHelpersOptions {
  helpers: string[];
  globalName?: string;
  format?: "iife" | "umd";
}

export function buildExternalHelpersBundle(options: ExternalHelpersOptions): string;

Dependencies { .dependencies }

Babel compiler { .dependency }

Provides parsing, transformation, and helper management for JavaScript sources. @satisfied-by

Babel runtime helpers { .dependency }

Importable helper modules that replace inlined helper code in transpiled output. @satisfied-by

Babel runtime transform plugin { .dependency }

Plugin that rewrites helper usage to pull from the runtime helper package with configurable module formats. @satisfied-by

Babel external helper builder { .dependency }

Generates a standalone helper library string for non-module environments. @satisfied-by