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Could not find the implementation for builder @angular-builders/jest:run

stackoverflow.com › questions › 57749789 › could-not-find-the-implementation-for-builder-angular-builders-jestrun

If you are using Angular 8, update the verison for @angular-builders/jest as well.

Answer from Akshay Rana on Stack Overflow

npm

npmjs.com › package › @angular-builders › jest

angular-builders/jest

January 14, 2026 - Allows ng test run with Jest instead of Karma. Latest version: 21.0.3, last published: 3 months ago. Start using @angular-builders/jest in your project by running `npm i @angular-builders/jest`. There are 2 other projects in the npm registry ...

      » npm install @angular-builders/jest

Published Jan 14, 2026

Version 21.0.3

GitHub

github.com › just-jeb › angular-builders

GitHub - just-jeb/angular-builders: Angular build facade extensions (Jest and custom webpack configuration) · GitHub

Angular build facade extensions (Jest and custom webpack configuration) - just-jeb/angular-builders

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Forked by 210 users

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Discussions

npm - Could not find the implementation for builder @angular-builders/jest:run - Stack Overflow

An unhandled exception occurred: Could not find the implementation for builder @angular-builders/jest:run See "/tmp/ng-7Fpvvi/angular-errors.log" for further details. More on stackoverflow.com

stackoverflow.com

jestjs - Angular configuration when using Jest - Stack Overflow

I've recently switched to Jest for unit testing Previously I was doing this: ng test --configuration=unit-tests But I am not sure how to run my Jest tests with an Angular configuration, I want som... More on stackoverflow.com

stackoverflow.com

intellij idea - Run individual Jest unit test for Angular 16+ with ng test - Stack Overflow

Or is there something else I should change, in order to run an individual Jest unit test in IntelliJ with the new Angular 16 experimental Jest support? Update: I tried the suggested changes of @Oksana in the first comment: jest is changed to jest:run on line "builder": "@angular-devkit/bui... More on stackoverflow.com

stackoverflow.com

Is Jest still going to be integrated officially with Angular?

As r/iamjediknight (and others) have already mentioned, Vitest is generally considered the more modern tool. It looks like the Angular team is also open to going directly with Vitest, skipping Jest—which, from my side, would be great news. I really hope this happens. More on reddit.com

r/angular

March 3, 2025

GitHub

github.com › just-jeb › angular-builders › blob › master › packages › jest › CHANGELOG.md

angular-builders/packages/jest/CHANGELOG.md at master · just-jeb/angular-builders

Angular build facade extensions (Jest and custom webpack configuration) - angular-builders/packages/jest/CHANGELOG.md at master · just-jeb/angular-builders

Author just-jeb

CodeSandbox

codesandbox.io › examples › package › @angular-builders › jest

angular-builders/jest examples

AboutJest runner for Angular build facade. Allows ng test run with Jest instead of Karma186,357Weekly Downloads

Stack Overflow

stackoverflow.com › questions › 57749789 › could-not-find-the-implementation-for-builder-angular-builders-jestrun

npm - Could not find the implementation for builder @angular-builders/jest:run - Stack Overflow

Top answer

1 of 1

If you are using Angular 8, update the verison for @angular-builders/jest as well.

GitHub

github.com › just-jeb › angular-builders › tree › master › packages › jest

angular-builders/packages/jest at master · just-jeb/angular-builders

Install the builder (and jest if you still haven't): $ npm i -D jest @types/jest @angular-builders/jest

Author just-jeb

Medium

kaleb-dalla.medium.com › how-to-configure-jest-in-your-angular-projects-d29155b8ed01

How to configure Jest in your Angular projects. | by Kaleb Dalla | Medium

November 4, 2024 - // to install @angular-builders/jest on an Angular v15 project npm install --save-dev jest @types/jest @angular-builders/jest@15.0.0

GitHub

github.com › just-jeb › angular-builders › blob › master › packages › jest › README.md

angular-builders/packages/jest/README.md at master · just-jeb/angular-builders

Angular build facade extensions (Jest and custom webpack configuration) - angular-builders/packages/jest/README.md at master · just-jeb/angular-builders

Author just-jeb

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Stack Overflow

stackoverflow.com › questions › 66011004 › angular-configuration-when-using-jest

jestjs - Angular configuration when using Jest - Stack Overflow

Top answer

1 of 2

In angular.json file specify jest runner for test architect:

"test": {
   "builder": "@angular-builders/jest:run",
   "options": {}
},

I assume that you have installed it, when switched to jest

2 of 2

Created a setupJest.ts file in the root and import jest-preset-angular
add the Jest configuration in the package.json

"jest": {
    "preset": "jest-preset-angular",
    "setupFilesAfterEnv": [
      "<rootDir>/setupJest.ts"
    ]
  }

modify the test script to use Jest instead of ng test.
run npm test

npm

npmjs.com › package › @angular-builders › jest › v › 19.0.0-beta.0

@angular-builders/jest - npm

Jest runner for Angular build facade. Allows ng test run with Jest instead of Karma. Latest version: 21.0.3, last published: a month ago. Start using @angular-builders/jest in your project by running `npm i @angular-builders/jest`. There are 2 other projects in the npm registry using @angular-builders/jest.

      » npm install @angular-builders/jest

Published Jan 14, 2026

Version 19.0.0-beta.0

Repository https://github.com/just-jeb/angular-builders

Homepage https://github.com/just-jeb/angular-builders#readme

Medium

medium.com › @sybrenbolandit › angular-with-jest-5926f3a5ed2e

ANGULAR WITH JEST. Do you ask yourself if there is a… | by Sybren Boland | Medium

August 27, 2021 - npm install -D jest @types/jest @angular-builders/jest

Stack Overflow

stackoverflow.com › questions › 76270270 › run-individual-jest-unit-test-for-angular-16-with-ng-test

intellij idea - Run individual Jest unit test for Angular 16+ with ng test - Stack Overflow

Top answer

1 of 1

I was able to resolve this with two steps.

Install @angular-builders/jest if not using latest version of angular you may want to specify the version ie if on angular 16 run npm install @angular-builders/jest@16 otherwise just a npm install @angular-builders/jest will be enough
update the test.builder in angular.json config to use @angular-builders/jest:run

my final angular.json test config looks as follows:

"test": {
  "builder": "@angular-builders/jest:run",
  "options": {
    "polyfills": [
      "zone.js",
      "zone.js/testing"
    ],
    "tsConfig": "tsconfig.spec.json"
  }
}

npm Trends

npmtrends.com › @angular-builders › jest-vs-jest-preset-angular

@angular-builders/jest vs jest-preset-angular | npm trends

Comparing trends for @angular-builders/jest 20.0.0 which has 164,533 weekly downloads and 1,160 GitHub stars vs. jest-preset-angular 15.0.1 which has 1,076,875 weekly downloads and 913 GitHub stars.

Just JeB

justjeb.com › post › angular-cli-ng-test-with-jest

Angular CLI: “ng test” with Jest in 3 minutes

June 27, 2022 - Due to this fact it’s possible that you favorite IDE will get confused with the typings and will propose you Jasmine types in unit tests. tsconfig.json is the config file that your IDE uses so you have to instruct it explicitly to use Jest typings. Bear in mind that the other side of the coin is that your IDE will propose you Jest types in your e2e tests. In angular.json change @angular-devkit/build-angular:karma to @angular-builders/jest:run:

reddit.com › r/angular › is jest still going to be integrated officially with angular?

r/angular on Reddit: Is Jest still going to be integrated officially with Angular?

March 3, 2025 -

I've been having a nightmare trying to reconfigure an old project's tests from Jasmine/Karma to Jest, because I have many coworkers advocating for it. But I'm surprised to see that while Karma has been deprecated for almost 2 years now, ng new and the refreshed Angular docs still only go over Karma, and make no mention of Jest or other testing frameworks at all https://angular.dev/guide/testing#other-test-frameworks.

This announcement https://blog.angular.dev/moving-angular-cli-to-jest-and-web-test-runner-ef85ef69ceca mentions @angular-devkit/build-angular:jest but I'm not sure if that's worth using - googling it actually points me to https://www.npmjs.com/package/@angular-builders/jest first but I'm not sure if this is something official.

jest-preset-angular also appears in lots of guides but it seems like every guide has a different way to set that up and I find its documentation kind of a nightmare of its own. Doesn't feel particularly futureproof.

Is Jest going to be a passing fad for Angular? Is there any news of deeper, documented integration anytime soon? Is Web Test Runner support at least close to being ready?

Top answer

1 of 9

2 of 9

Jest relies on jsdom, which is missing polyfills for things that Chrome has implemented and are widely used by libraries. So anyone using Jest that has a dependency that uses TextEncoder has to decide if they want to write their own polyfill, switch to happydom, or remove the dependency, or my colleague’s favorite method - deleting affected .spec files.

Yarn

classic.yarnpkg.com › en › package › @angular-builders › jest

angular-builders/jest

Fast, reliable, and secure dependency management.

DanyWalls

danywalls.com › how-to-configure-jest-in-angular-18

How to Configure Jest in Angular 18 | DanyWalls

November 25, 2023 - To replace Karma and Jasmine with Jest in Angular 18, first remove the existing packages by running npm remove karma karma-chrome-launcher karma-jasmine karma-jasmine-html-reporter, then install Jest and its builder with npm i -D jest @types/jest @angular-builders/jest, and finally update the test section in angular.json to point to the Jest builder.

Beyondjava

beyondjava.net › angular-17-jest-mono-repo-just-jeb

How to set up Jest for an Angular 17 monorepo using @ ...

January 1, 2024 - Beyond Java · Sitemap · Talks & Articles · Projects · Guest Posts · About · Legalese · Statistics · (opt out) · Mastodon

Npm

npm.io › package › @angular-builders › jest

angular-builders/jest NPM

"compilerOptions": { ... "module": "commonjs", "types": ["jest"] } Make sure the module is commonjs, otherwise tests will fail at imports. ... "projects": { ... "[your-project]": { ... "architect": { ... "test": { "builder": "@angular-builders/jest:run" "options": { ...

GitHub

github.com › just-jeb › angular-builders › issues › 1354

Support for Angular 16 · Issue #1354 · just-jeb/angular-builders

May 3, 2023 - Is your feature request related to a problem? Please describe. The schematic @angular-builders/jest should support Angular 16. Describe the solution you'd like Update the schematic (peerDependency must support @angular-devkit/build-angul...

Author d-koppenhagen