Function resolve

bazel/private/node_loader/hooks.mjs:41–75

(specifier, context, nextResolve)

/** @type {import('module').ResolveHook} */
export const resolve = async (specifier, context, nextResolve) => {
  // True when it's a non-module import without explicit extensions.
  const isNonModuleExtensionlessImport =
    nonModuleImportRe.test(specifier) && !explicitExtensionRe.test(specifier);
  const pathMappings = !nonModuleImportRe.test(specifier) ? pathMappingMatcher(specifier) : [];

  // If it's neither path mapped, nor an extension-less import that may be fixed up, exit early.
  if (!isNonModuleExtensionlessImport && pathMappings.length === 0) {
    return nextResolve(specifier, context);
  }

  if (pathMappings.length > 0) {
    for (const mapping of pathMappings) {
      const res = await resolve(mapping, context, nextResolve).catch(() => null);
      if (res !== null) {
        return res;
      }
    }
  } else {
    const specifiers = [
      `${specifier}.js`,
      `${specifier}/index.js`,
      // Legacy variants for the `zone.js` variant using still `ts_library`.
      // TODO(rules_js migration): Remove this.
      `${specifier}.mjs`,
      `${specifier}/index.mjs`,
    ];
    for (const specifier of specifiers) {
      try {
        return await nextResolve(specifier, context);
      } catch {}
    }
  }
  return nextResolve(specifier, context);
};