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typescript - 在 Jest TypeScript 中找不到名称“它”

问题描述

我尝试在 React + TypeScript 中为 Jest 创建一个初始设置。我已完成初始设置并尝试检查测试是否运行。当我使用命令运行测试npm test时，我收到以下错误：

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`.

我已经安装了 Jest 的类型并删除了 中的类型tsconfig.json，但我仍然遇到同样的错误。

{
  "compilerOptions": {
    "target": "es6",
    "lib": ["dom", "dom.iterable", "esnext"],
    "allowJs": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "module": "esnext",
    "moduleResolution": "node",
    "plugins": [{ "name": "typescript-tslint-plugin" }],
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "preserve",
    "pretty": true,
    "baseUrl": "src",
    "types": ["jest"],
    "typeRoots": ["./src/types"],
    "suppressImplicitAnyIndexErrors": true
  },
  "include": ["src", "node_modules/@types/jest"],
  "exclude": ["node_modules"]
}
`

包.json


    "jest": {
        "transform": {
          ".(ts|tsx)": "ts-jest"
        },
        "testRegex": "(/__tests__/.*|\\.(test|spec))\\.(ts|tsx|js)$",
        "moduleFileExtensions": [
          "ts",
          "tsx",
          "js"
        ]
      },
      "devDependencies": {
        "@babel/plugin-proposal-export-default-from": "^7.2.0",
        "@types/enzyme": "^3.9.3",
        "@types/jest": "^24.0.14",
        "enzyme": "^3.10.0",
        "gh-pages": "^1.2.0",
        "husky": "^2.2.0",
        "jest": "^24.8.0",
        "node-sass": "^4.11.0",
        "prettier": "^1.17.0",
        "react-scripts": "2.1.8",
        "react-test-renderer": "^16.8.6",
        "stylelint": "^9.3.0",
        "stylelint-config-recommended-scss": "^3.2.0",
        "stylelint-config-standard": "^18.2.0",
        "stylelint-order": "^0.8.1",
        "stylelint-scss": "^3.1.3",
        "ts-jest": "^24.0.2",
        "tslint": "^5.16.0",
        "tslint-config-prettier": "^1.18.0",
        "tslint-plugin-prettier": "^2.0.1",
        "tslint-react": "^4.0.0",
        "tslint-react-hooks": "^2.1.0"
      }

标签： typescriptnpmjestjsts-jest

解决方案

安装

npm install jest @types/jest ts-jest

jest.config.js -- 在根目录

 module.exports = {
  roots: ['<rootDir>/src'],
  transform: {
    '^.+\\.tsx?$': 'ts-jest',
  },
  testRegex: '(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$',
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
}

tsconfig.json

{
    "compilerOptions": {
     ...

      "types": ["reflect-metadata", "jest"],
      "typeRoots": ["./types", "./node_modules/@types"]

     ...
    },
    "exclude": ["node_modules", "**/*.spec.ts", "**/*.test.ts"],
    "include": ["./src/**/*.tsx", "./src/**/*.ts"]
  }

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