Getting "don't know how to turn this value into a node" using @vue/vue2-jest@^27.0.0-alpha.4 and jest@^27.1.0

[Spronghi]

Hi everyone, I am getting an error when trying to execute my unit tests using @vue/vue2-jest@^27.0.0-alpha.4 and jest@^27.1.0. As far as I know this should be solved with this PR, but upgrading from older version of jest to a new one using vue upgrade --next breaks it.

This is the error:

    /path/to/file.ts: don't know how to turn this value into a node

      at valueToNode (node_modules/@babel/types/lib/converters/valueToNode.js:98:9)
      at Object.valueToNode (node_modules/@babel/types/lib/converters/valueToNode.js:92:58)
      at Object.exit (node_modules/istanbul-lib-instrument/src/visitor.js:700:36)
      at PluginPass.exit (node_modules/babel-plugin-istanbul/lib/index.js:158:38)
      at newFn (node_modules/@babel/traverse/lib/visitors.js:177:21)
      at NodePath._call (node_modules/@babel/traverse/lib/path/context.js:53:20)
      at NodePath.call (node_modules/@babel/traverse/lib/path/context.js:40:17)
      at NodePath.visit (node_modules/@babel/traverse/lib/path/context.js:109:8)
      at TraversalContext.visitQueue (node_modules/@babel/traverse/lib/context.js:103:16)
      at TraversalContext.visitSingle (node_modules/@babel/traverse/lib/context.js:77:19)
      at TraversalContext.visit (node_modules/@babel/traverse/lib/context.js:131:19)
      at traverseNode (node_modules/@babel/traverse/lib/traverse-node.js:24:17)
      at traverse (node_modules/@babel/traverse/lib/index.js:62:34)
      at transformFile (node_modules/@babel/core/lib/transformation/index.js:108:29)
          at transformFile.next (<anonymous>)
      at run (node_modules/@babel/core/lib/transformation/index.js:35:12)

Here's my jest.config.js:

module.exports = {
  globals: {
    'ts-jest': {
      isolatedModules: true,
    },
  },
  preset: '@vue/cli-plugin-unit-jest/presets/typescript-and-babel',
  testEnvironment: 'jest-environment-jsdom',
  testMatch: [
    '<rootDir>/(src/**/*.spec.(ts|tsx|js))',
    '**/tests/unit/**/*.spec.[jt]s?(x)',
    '**/__tests__/*.[jt]s?(x)',
  ],
  transformIgnorePatterns: ['<rootDir>/node_modules/(?!(lit-element)/)'],
  collectCoverage: true,
  coverageDirectory: 'tests/coverage',
  reporters: [
    'default',
    [
      './node_modules/jest-html-reporter',
      {
        outputPath: 'tests/report/test_report.html',
      },
    ],
  ],
  setupFilesAfterEnv: ['./tests/unit/jest.init.ts'],
  moduleFileExtensions: ['js', 'ts', 'json', 'vue'],
  transform: {
    '^.+\\.ts$': 'ts-jest',
    '^.+\\.js$': 'babel-jest',
    '^.+\\.vue$': '@vue/vue2-jest',
  },
};

Am I missing something or is the bug still not solved?

Thanks a lot

[Spronghi]

It works if you use the options coverageReporters: 'v8' on the jest.config.js from the Coverage Provider on official Jest documentation but I think it doesn't solve the issue.

[Spronghi]

Can I close this?