Setting up @cypress/code-coverage with Angular and TypeScript: A comprehensive guide

When following the instructions in Cypress documentation for @cypress/code-coverage, it recommends using the following code...

// cypress/support/e2e.js
import '@cypress/code-coverage/support'

...as well as...

// cypress.config.ts
import { defineConfig } from 'cypress'

export default defineConfig({
  e2e: {
    setupNodeEvents(on, config) {
      require('@cypress/code-coverage/task')(on, config)
      return config
    },
  },
})

However, TypeScript is flagging errors in cypress.config.ts related to the require function, and suggests using import instead. The plugin only exports a function called registerCodeCoverageTasks.

// @cypress/code-coverage/task.js
...

function registerCodeCoverageTasks(on, config) {
  on('task', tasks)

  // set a variable to let the hooks running in the browser
  // know that they can send coverage commands
  config.env.codeCoverageTasksRegistered = true

  return config
}

module.exports = registerCodeCoverageTasks

Therefore, the Cypress config code should be adjusted as follows...

// cypress.config.ts
import { defineConfig } from 'cypress';
import registerCodeCoverageTasks from '@cypress/code-coverage/task';

export default defineConfig({
  e2e: {
    setupNodeEvents(on, config) {
      registerCodeCoverageTasks(on, config);
      return config;
    },
  },
})

However, this adjustment results in a configuration error being thrown.

https://i.sstatic.net/19KMwow3.png

What could be the issue here?

Answer №1

It appears that you are able to convert the module.exports to an es6 import. Although I have not tested it thoroughly for code coverage, there are no loading errors when using this code:

import { defineConfig } from "cypress";
import * as ccModule from '@cypress/code-coverage/task';
const registerCodeCoverageTasks = ccModule.default

export default defineConfig({
  e2e: {
    setupNodeEvents(on, config) {
      registerCodeCoverageTasks(on, config);
      return config;
    },
  },
})

To ensure Typescript compatibility, update the tsconfig.json file:

{
  "compilerOptions": {
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    ...

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