Function load

src/esm.ts:228–288

(
    url: string,
    context: {
      format: NodeLoaderHooksFormat | null | undefined;
      importAssertions?: NodeLoaderHooksAPI2.NodeImportAssertions;
    },
    defaultLoad: typeof load
  )

  // `load` from new loader hook API (See description at the top of this file)
  async function load(
    url: string,
    context: {
      format: NodeLoaderHooksFormat | null | undefined;
      importAssertions?: NodeLoaderHooksAPI2.NodeImportAssertions;
    },
    defaultLoad: typeof load
  ): Promise<{
    format: NodeLoaderHooksFormat;
    source: string | Buffer | undefined;
  }> {
    return addShortCircuitFlag(async () => {
      // If we get a format hint from resolve() on the context then use it
      // otherwise call the old getFormat() hook using node's old built-in defaultGetFormat() that ships with ts-node
      const format =
        context.format ??
        (
          await getFormat(
            url,
            context,
            nodeGetFormatImplementation.defaultGetFormat
          )
        ).format;

      let source = undefined;
      if (format !== 'builtin' && format !== 'commonjs') {
        // Call the new defaultLoad() to get the source
        const { source: rawSource } = await defaultLoad(
          url,
          {
            ...context,
            format,
          },
          defaultLoad
        );

        if (rawSource === undefined || rawSource === null) {
          throw new Error(
            `Failed to load raw source: Format was '${format}' and url was '${url}''.`
          );
        }

        // Emulate node's built-in old defaultTransformSource() so we can re-use the old transformSource() hook
        const defaultTransformSource: typeof transformSource = async (
          source,
          _context,
          _defaultTransformSource
        ) => ({ source });

        // Call the old hook
        const { source: transformedSource } = await transformSource(
          rawSource,
          { url, format },
          defaultTransformSource
        );
        source = transformedSource;
      }