Method resolve

packages/jest-runtime/src/internals/cjsRequire.ts:112–170

(
    from: string,
    moduleName: string | undefined,
    options: ResolveOptions = {},
  )

  }

  private resolve(
    from: string,
    moduleName: string | undefined,
    options: ResolveOptions = {},
  ): string {
    if (moduleName == null) {
      throw new Error(
        'The first argument to require.resolve must be a string. Received null or undefined.',
      );
    }

    if (path.isAbsolute(moduleName)) {
      const module = this.resolution.resolveCjsFromDirIfExists(
        moduleName,
        moduleName,
        [],
      );
      if (module) {
        return module;
      }
    } else if (options.paths) {
      const module = this.resolution.resolveCjsStub(from, moduleName);

      if (module) {
        return module;
      }

      for (const searchPath of options.paths) {
        const absolutePath = path.resolve(from, '..', searchPath);

        // required to also resolve files without leading './' directly in the path
        const module = this.resolution.resolveCjsFromDirIfExists(
          absolutePath,
          moduleName,
          [absolutePath],
        );

        if (module) {
          return module;
        }
      }

      throw new Resolver.ModuleNotFoundError(
        `Cannot resolve module '${moduleName}' from paths ['${options.paths.join(
          "', '",
        )}'] from ${from}`,
      );
    }

    try {
      return this.resolution.resolveCjs(from, moduleName);
    } catch (error) {
      const module = this.resolution.getCjsMockModule(from, moduleName);
      if (module) {
        return module;
      }
      throw error;
    }