Function defaultResolve

lib/internal/modules/cjs/loader.js:1186–1214

(specifier, context)

  // This is used as the last nextResolve for the resolve hooks.
  function defaultResolve(specifier, context) {
    // TODO(joyeecheung): parent and isMain should be part of context, then we
    // no longer need to use a different defaultResolve for every resolution.
    // In the hooks, context.conditions is passed around as an array, but internally
    // the resolution helpers expect a SafeSet. Do the conversion here.
    let conditionSet;
    const conditions = context.conditions;
    if (conditions !== undefined && conditions !== getCjsConditionsArray()) {
      if (!ArrayIsArray(conditions)) {
        throw new ERR_INVALID_ARG_VALUE('context.conditions', conditions,
                                        'expected an array');
      }
      conditionSet = new SafeSet(conditions);
    } else {
      conditionSet = getCjsConditions();
    }

    const result = defaultResolveImpl(specifier, parent, isMain, {
      __proto__: null,
      paths: requireResolveOptions?.paths,
      conditions: conditionSet,
    });
    // If the default resolver does not return a URL, convert it for the public API.
    result.url ??= convertCJSFilenameToURL(result.filename);

    // Remove filename because it's not part of the public API.
    // TODO(joyeecheung): maybe expose it in the public API to avoid re-conversion for users too.
    return { __proto__: null, url: result.url, format: result.format };
  }

  const resolveResult = resolveWithHooks(specifier, parentURL, /* importAttributes */ undefined,
                                         getCjsConditionsArray(), defaultResolve);