当将TypeScript与Jest结合使用时，我的规范会失败并出现错误消息，例如：
test/unit/some.spec.ts:1:1 - error TS2582: Cannot find name 'describe'. Do you need to install type definitions for a test runner? Try `npm i @types/jest` or `npm i @types/mocha`.
test/unit/some.spec.ts:2:3 - error TS2582: Cannot find name 'it'. Do you need to install type definitions for a test runner? Try `npm i @types/jest` or `npm i @types/mocha`.
test/unit/some.spec.ts:3:7 - error TS2304: Cannot find name 'expect'.
test/unit/some.spec.ts:7:1 - error TS2582: Cannot find name 'test'. Do you need to install type definitions for a test runner? Try `npm i @types/jest` or `npm i @types/mocha`.
这些类型已经安装。
我使用：
"@types/jest": "^23.3.12",
"jest": "^23.6.0",
"ts-jest": "^23.10.5",
"typescript": "^3.1.6"
我使用jest--forceExit--coverage--verbose运行测试
我使用Visual Studio代码作为我的IDE和Angular项目，我必须注释掉/删除tsconfig.json文件中的类型，并在tsconfig.spec.json中的类型中添加“jest”。
{
"compilerOptions": {
// "types": []
}
}
{
"compilerOptions": {
"types": ["jest", "node"]
}
}
