为什么 ts-jest 不加载我的自定义 tsconfig 文件？

Question

For some reason, my custom tsconfig file isn't being picked up in jest.config.ts. Here is my jest.config.ts:

module.exports = {
  setupFilesAfterEnv: [`./jest.setup.ts`],
  testEnvironment: `jsdom`,
  roots: [
    `<rootDir>/test`
  ],
  testMatch: [
    `**/__tests__/**/*.+(ts|tsx|js)`,
    `**/?(*.)+(spec|test).+(ts|tsx|js)`
  ],
  transform: {
    "^.+\\.(ts|tsx)$": `ts-jest`
  },
  globals: {
    "ts-jest": {
      tsConfig: `tsconfig.jest.json`
    }
  }
}

I know that other parts of this config ARE being applied. For example, if I remove the keys above globals my tests don't run. Also, I know that the change specified in my tsconfig.jest.json file is the necessary change to fix my tests because if I make the same change in my main tsconfig.json file my tests run fine.

I've also tried putting to desired tsconfig compiler options directly into the jest.config.ts file, but that doesn't seem to work either:

module.exports = {
  setupFilesAfterEnv: [`./jest.setup.ts`],
  testEnvironment: `jsdom`,
  roots: [
    `<rootDir>/test`
  ],
  testMatch: [
    `**/__tests__/**/*.+(ts|tsx|js)`,
    `**/?(*.)+(spec|test).+(ts|tsx|js)`
  ],
  transform: {
    "^.+\\.(ts|tsx)$": `ts-jest`
  },
  globals: {
    "ts-jest": {
      tsConfig: {
        jsx: `react`
      }
    }
  }
}

Answer 1

the correct key is tsconfig not tsConfig .

Answer 2

Updated answer for jest@29 (released August 2022) and ts-jest@29 (released September 2022)

All of my React component *.tsx -related tests were broken after upgrading Jest-and-friends to version 29. I also received error messages that jestConfig.globals['ts-jest'] is now deprecated.

As per the ts-jest "TypeScript Config option" docs you should modify your Jest config to jestConfig.transform['regex_match_files'] . The config for my project is below. (Caveat: note that I am using a custom location for my config files, ie a dedicated /config/ directory, but the principle of specifying the relative-path-to-config-file remains the same).

  transform: {
    '^.+\\.tsx?$': [
      'ts-jest',
      // required due to custom location of tsconfig.json configuration file
      // https://kulshekhar.github.io/ts-jest/docs/getting-started/options/tsconfig/
      {tsconfig: './config/tsconfig.json'},
    ],
  },