Cannot read property 'runCLI' of undefined in gulp-jest

Question

I am trying to run jest tests with gulp using gulp-jest. Installed these packages from npm:

"gulp-jest": "^4.0.3", 
"jest-cli": "^25.3.0"

and provided the following configuration to jest:

"jest": {
    "setupFilesAfterEnv": [
      "<rootDir>/jest.setup.js"
    ],
    "collectCoverage": true,
    "coverageDirectory": "./test/unit-test-coverage",
    "coverageReporters": [
      "text",
      "lcov"
    ]
  }

I have written a basic method in my gulpfile.js, referred this link:

function runJsTests() {
    process.env.NODE_ENV = 'test';
    const __dirname = "Features/Components";
    return gulp.src(__dirname).pipe(jest({
    }));
}

However, I am getting the following error when I run the gulp task:

TypeError: Cannot read property 'runCLI' of undefined

Answer 1

I had the same trouble last friday, to resolve it, I finally had to downgrade version used of jest-cli :

"@types/jest": "24.9.0", "jest": "24.9.0", "ts-jest": "24.3.0 "jest-cli": "24.9.0", "jest-html-reporter": "2.5.0",

A bug known on new version of Jest-cli

-> think to remove all node_modules and package_lock.json!

Good luck ;)