Method resolvePaths

packages/jest-runtime/src/internals/cjsRequire.ts:172–197

(
    from: string,
    moduleName: string | undefined,
  )

  }

  private resolvePaths(
    from: string,
    moduleName: string | undefined,
  ): Array<string> | null {
    const fromDir = path.resolve(from, '..');
    if (moduleName == null) {
      throw new Error(
        'The first argument to require.resolve.paths must be a string. Received null or undefined.',
      );
    }
    if (moduleName.length === 0) {
      throw new Error(
        'The first argument to require.resolve.paths must not be the empty string.',
      );
    }

    if (moduleName[0] === '.') {
      return [fromDir];
    }
    if (this.resolution.isCoreModule(moduleName)) {
      return null;
    }
    const modulePaths = this.resolution.getModulePaths(fromDir);
    const globalPaths = this.resolution.getGlobalPaths(moduleName);
    return [...modulePaths, ...globalPaths];
  }
}

export interface CoreModuleProviderOptions {