NestJS Jest cannot find module with absolute path

问题

I have a quite new NestJS application. I'm trying to run unit tests, but they keep failing due to 'cannot find module..' when using absolute paths ("src/users/..."), but works when using relative paths ("./users/.."). Is there anything wrong with my configuration here?

Jest setup in package.json:

"jest": {
  "moduleFileExtensions": [
    "js",
    "json",
    "ts"
  ],
  "rootDir": "src",
  "testRegex": ".spec.ts$",
  "transform": {
    "^.+\\.(t|j)s$": "ts-jest"
  },
  "coverageDirectory": "../coverage",
  "testEnvironment": "node"
}

tsconfig.json:

{
  "compilerOptions": {
    "module": "commonjs",
    "declaration": true,
    "removeComments": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "allowSyntheticDefaultImports": true,
    "target": "es2017",
    "sourceMap": true,
    "outDir": "./dist",
    "baseUrl": "./",
    "incremental": true
  }
}

回答1:

I had the same issue, the problem was the default jest configuration created by Nestjs.

I changed "rootDir": "src" to "rootDir": "./" and add "modulePaths": ['<rootDir>'].

Finaly, my jest configuration looks like this:

  moduleFileExtensions: ['js', 'json', 'ts'],
  rootDir: './',
  modulePaths: ['<rootDir>'],
  testRegex: 'spec.ts$',
  transform: {
    '^.+\\.(t|j)s$': 'ts-jest'
  },
  coverageDirectory: './coverage',
  testEnvironment: 'node',

If you have some relative paths to your config you will probably have to update them because your rootDir is not src anymore.

You can even remove rootDir is you setup the jest config in package.json or if the config file is located at the root of your project, as explained in the doc: https://jestjs.io/docs/en/configuration#rootdir-string

And if you want read about modulePaths: https://jestjs.io/docs/en/configuration#modulepaths-arraystring

Hope it will also work for you.

回答2:

I believe you are missing the rootDir in your tsconfig.json

If you want to import { ... } from 'src/..., the rootDir needs to be equal to ./.

Check this example:

{
"moduleFileExtensions": [
    "ts",
    "tsx",
    "json",
    "js"
],
"rootDir": "./",
"testRegex": ".spec.ts$",
"collectCoverageFrom": ["**/*.ts", "!**/node_modules/**"],
"coverageDirectory": "./coverage",
"coverageReporters": ["html", "text", "text-summary"],
"preset": "ts-jest",}



  "compilerOptions": {
  "module": "commonjs",
  "declaration": true,
  "removeComments": true,
  "emitDecoratorMetadata": true,
  "experimentalDecorators": true,
  "allowSyntheticDefaultImports": true,
  "target": "es2017",
  "sourceMap": true,
  "outDir": "./dist",
  "rootDir": "./",
  "baseUrl": "./",
  "incremental": true
}

来源：https://stackoverflow.com/questions/64028100/nestjs-jest-cannot-find-module-with-absolute-path

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ts-jest