**类型脚本版本：**3.9.0-dev.20200328
搜索词：

WebCrypto，网页加密，SubtleCrypto，微妙的，PromiseLike

预期行为：

编译时应无错误。

实际行为：

Type 'PromiseLike<CryptoKey>' is missing the following properties from type 'Promise<CryptoKey>': catch, [Symbol.toStringTag]

相关问题：

microsoft/TypeScript-DOM-lib-generator#843（应修复此问题的提取请求）
microsoft/TypeScript-DOM-lib-generator#60
microsoft/TypeScript-DOM-lib-generator#47

代码

const keyPromise: Promise<CryptoKey> = crypto.subtle.generateKey({name: 'AES-GCM', length: 256}, true, ['encrypt']);

输出

"use strict";
const keyPromise = crypto.subtle.generateKey({ name: 'AES-GCM', length: 256 }, true, ['encrypt']);

编译器选项

{
  "compilerOptions": {
    "noImplicitAny": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "strictPropertyInitialization": true,
    "strictBindCallApply": true,
    "noImplicitThis": true,
    "noImplicitReturns": true,
    "alwaysStrict": true,
    "esModuleInterop": true,
    "declaration": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "moduleResolution": 2,
    "target": "ES2017",
    "jsx": "React",
    "module": "ESNext"
  }
}

**Playground链接：**已提供