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Cannot write coverage reports

See original GitHub issue

Hi, I’ve recently attempted moving to vue-jest from jest-vue-preprocessor. However, it seems like there’s an issue with the conversion of .vue files that’s blocking the coverage reports.

Here’s the stack trace:

Failed to write coverage reports:
        ERROR: TypeError: Cannot read property 'decl' of undefined
        STACK: TypeError: Cannot read property 'decl' of undefined
    at path/node_modules/istanbul-reports/lib/lcovonly/index.js:32:38
    at Array.forEach (<anonymous>)
    at LcovOnlyReport.onDetail (path/node_modules/istanbul-reports/lib/lcovonly/index.js:30:28)
    at LcovReport.(anonymous function) [as onDetail] (path/node_modules/istanbul-reports/lib/lcov/index.js:21:24)
    at Visitor.(anonymous function) [as onDetail] (path/node_modules/istanbul-lib-report/lib/tree.js:34:30)
    at ReportNode.Node.visit (path/node_modules/istanbul-lib-report/lib/tree.js:123:17)
    at path/node_modules/istanbul-lib-report/lib/tree.js:116:23
    at Array.forEach (<anonymous>)
    at visitChildren (path/node_modules/istanbul-lib-report/lib/tree.js:115:32)
    at ReportNode.Node.visit (path/node_modules/istanbul-lib-report/lib/tree.js:126:5)

The reason I’m filing this here is because I have no such issues if I use jest-vue-preprocessor instead. Digging through the istanbul code gives me

var fc = node.getFileCoverage()
console.log(fc)
FileCoverage {
  data: 
   { path: 'unknown',
     statementMap: 
      { '0': [Object],
        '1': [Object],
        '2': [Object],
        '3': [Object],
        '4': [Object],
        '5': [Object],
        '6': [Object] },
     fnMap: {},
     branchMap: {},
     s: 
      { '0': 18,
        '1': 20,
        '2': 18,
        '3': 20,
        '4': 15,
        '5': 13,
        '6': 15,
        '7': NaN,
        '8': NaN,
        '9': NaN,
        '10': NaN,
        '11': NaN,
        '12': NaN,
        '13': NaN,
        '14': NaN,
        '15': NaN,
        '16': NaN,
        '17': NaN,
        '18': NaN,
        '19': NaN,
        '20': NaN,
        '21': NaN,
        '22': NaN,
        '23': NaN,
        '24': NaN,
        '25': NaN,
        '26': NaN,
        '27': NaN },
     f: 
      { '0': NaN,
        '1': NaN,
        '2': NaN,
        '3': NaN,
        '4': NaN,
        '5': NaN,
        '6': NaN,
        '7': NaN,
        '8': NaN,
        '9': NaN,
        '10': NaN,
        '11': NaN },
     b: 
      { '0': [Array],
        '1': [Array],
        '2': [Array],
        '3': [Array],
        '4': [Array],
        '5': [Array],
        '6': [Array],
        '7': [Array],
        '8': [Array],
        '9': [Array],
        '10': [Array],
        '11': [Array],
        '12': [Array],
        '13': [Array] },
     _coverageSchema: '332fd63041d2c1bcb487cc26dd0d5f7d97098a6c',
     hash: 'd3767ca38b776b618c16aa6dc3fa8c1632bfc5e2' } }

Looks to me like the fnMap object is strangely missing. If I mess with the source code to avoid throwing errors, none of my .vue files have coverage reports on them.

jest-vue-preprocessor has no issues reporting coverage.

Issue Analytics

State:
Created 6 years ago
Comments:7 (2 by maintainers)

Top GitHub Comments

2reactions

anteriovieiracommented, Mar 23, 2018

@TheDeveloperTom I able to solve, I simply removed the istanbul plugin.

Make sure you are not using the babel-plugin-istanbul plugin. Jest wraps Istanbul, and therefore also tells Istanbul what files to instrument with coverage collection

1reaction

anteriovieiracommented, Feb 20, 2018

@eddyerburgh I’m using version v2.0.0 and the same error happened to me.

Failed to write coverage reports:
        ERROR: TypeError: Cannot read property 'decl' of undefined
        STACK: TypeError: Cannot read property 'decl' of undefined
    at /home/circleci/repo/node_modules/istanbul-reports/lib/lcovonly/index.js:32:38
    at Array.forEach (<anonymous>)
...

report: https://circleci.com/gh/buefy/buefy/23 -> section Run tests