找不到 builder @angular-builders/jest:run 的实现

Question

I'm following the instruction from this article on howto use "Jest" with Angular ng test : https://codeburst.io/angular-6-ng-test-with-jest-in-3-minutes-b1fe5ed3417c

I see the same instructions in the README for the Jest Angular8 builder here: https://github.com/just-jeb/angular-builders/tree/master/packages/jest

When I run ng test I get:

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.

Output from the error log is follows:

[error] Error: Could not find the implementation for builder @angular-builders/jest:run
    at WorkspaceNodeModulesArchitectHost.resolveBuilder (/home/dheater/src/taskbox/node_modules/@angular-devkit/architect/node/node-modules-architect-host.js:49:19)
    at TestCommand.initialize (/home/dheater/src/taskbox/node_modules/@angular/cli/models/architect-command.js:134:55)
    at async TestCommand.validateAndRun (/home/dheater/src/taskbox/node_modules/@angular/cli/models/command.js:124:9)
    at async Object.runCommand (/home/dheater/src/taskbox/node_modules/@angular/cli/models/command-runner.js:186:24)
    at async default_1 (/home/dheater/src/taskbox/node_modules/@angular/cli/lib/cli/index.js:50:31)

Versions are:

+ jest@24.9.0
+ @angular-builders/jest@7.4.4

and I see the package in node_modules/@angular_builders/jest

Any suggestions?

Answer 1

如果您使用的是 Angular 8，请同时更新 @angular-builders/jest 的版本。