测试无法运行测试用例退出 TypeError: Jest: a transform must export a `process` function

Posted 2023-02-19

【中文标题】测试无法运行测试用例退出 TypeError: Jest: a transform must export a `process` function

【英文标题】：Test unable to run test cases exits with TypeError: Jest: a transform must export a `process` function

【发布时间】：2021-08-26 17:09:33

【问题描述】：

//tsconfig.base.json “compileOnSave”：假， “编译器选项”： "baseUrl": "./", "outDir": "./dist/out-tsc", “源地图”：是的， “声明”：错误， “下级迭代”：真， “experimentalDecorators”：是的， “模块”：“esnext”， "moduleResolution": "节点", “importHelpers”：是的， “目标”：“es2015”， "typeRoots": ["node_modules/@types"], “lib”：[“es2018”，“dom”] , “角编译器选项”： “fullTemplateTypeCheck”：真， “严格注入参数”：真

    //ts.spec.json
   
  "extends": "./tsconfig.base.json",
  "compilerOptions": 
    "outDir": "./out-tsc/spec",
    "types": ["jest", "node"],
    "esModuleInterop": true,
    "emitDecoratorMetadata": true
  ,
  "files": ["src/test.ts", "src/polyfills.ts"],
  "include": ["src/**/*.spec.ts", "src/**/*.d.ts"]
   


//setupTest.js
import 'jest-extended';
import 'jest-preset-angular/setup-jest';
import './globalMocks';




 //jest dependancies list 
"@types/jest": "~26.0.15",
    "@types/node": "^12.11.1",
    "@types/uuid": "^7.0.0",
    "babel-jest": "^27.0.2",
    "codelyzer": "^6.0.0",
    "jest": "^26.6.3",
    "jest-environment-jsdom-sixteen": "1.0.3",
    "jest-extended": "^0.11.5",
    "jest-junit": "^12.0.0",
    "jest-preset-angular": "^9.0.0-next.3",
    "ng-bullet": "~1.0.3",
    "regenerator-runtime": "^0.13.7",
    "rxjs-tslint-rules": "^4.34.0",
    "ts-node": "~8.3.0",
    "tslint": "~6.1.0",
    "typescript": "~4.0.5"




FAIL  src/app/authentication/register/register.component.spec.ts
  ● Test suite failed to run

    TypeError: Jest: a transform must export a `process` function.

      at ScriptTransformer._getTransformer (node_modules/@jest/transform/build/ScriptTransformer.js:360:13)
      at ScriptTransformer.transformSource (node_modules/@jest/transform/build/ScriptTransformer.js:427:28)
      at ScriptTransformer._transformAndBuildScript (node_modules/@jest/transform/build/ScriptTransformer.js:569:40)
      at ScriptTransformer.transform (node_modules/@jest/transform/build/ScriptTransformer.js:607:25)

【参考方案1】：

使用 ts-node 和 ts-jest，它们都是 26.x 版本

    "jest": "^26.6.3",
    "ts-jest": "^26.5.5",