修复ts import不能简写为目录名的问题

[em64t]

目录结构如下：

.
├── other.ts
├── test
│   └── index.ts

other.ts代码如下：

import { test } from './test';  // 报错
import { test } from './test/index';  // ok

问题

在ts里，import 简写为目录名'./test'时报错[Error] Missing files: ./test in /xxxxxxx/other.ts

Checklist

• [ ] npm run test passes
• [ ] tests and/or benchmarks are included
• [ ] cases or donate is changed or added
• [ ] documentation is changed or added

[tencent-adm]

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