Istanbul: TypeError: metrics.isEmpty is not a function

[risingsunomi]

Problem

When running npm test using jest with jest configuration

{
 ...,
"scripts": {
    "test": "jest"
  },
"jest": {
    "collectCoverage": true
  },
"devDependencies": {
    "eslint": "^4.18.2",
    "eslint-config-google": "^0.9.1",
    "istanbul": "^0.4.5",
    "istanbul-api": "^1.3.1",
    "istanbul-lib-report": "^1.1.3",
    "jest": "^22.4.2"
  }
}

In the package.json and using npm test, I am receiving this error at the end of a test

> [email protected] test /Users/netghost/Projects/js/newsirc
> jest

 PASS  __tests__/RSS_IO_test.js
  class RSS_IO
    ✓ starts construction at initialization (3ms)
    ✓ has an array of rss_urls (1ms)

-----------|----------|----------|----------|----------|-------------------|
File       |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
-----------|----------|----------|----------|----------|-------------------|
All files  |      100 |      100 |      100 |      100 |                   |

        Failed to write coverage reports:
        ERROR: TypeError: metrics.isEmpty is not a function
        STACK: TypeError: metrics.isEmpty is not a function
    at tableRow (/Users/netghost/Projects/js/newsirc/node_modules/istanbul-reports/lib/text/index.js:133:27)
    at TextReport.onSummary (/Users/netghost/Projects/js/newsirc/node_modules/istanbul-reports/lib/text/index.js:188:15)
    at TextReport.onDetail (/Users/netghost/Projects/js/newsirc/node_modules/istanbul-reports/lib/text/index.js:193:17)
    at Visitor.(anonymous function) [as onDetail] (/Users/netghost/Projects/js/newsirc/node_modules/istanbul-api/node_modules/istanbul-lib-report/lib/tree.js:34:30)
    at ReportNode.Node.visit (/Users/netghost/Projects/js/newsirc/node_modules/istanbul-api/node_modules/istanbul-lib-report/lib/tree.js:123:17)
    at /Users/netghost/Projects/js/newsirc/node_modules/istanbul-api/node_modules/istanbul-lib-report/lib/tree.js:116:23
    at Array.forEach (<anonymous>)
    at visitChildren (/Users/netghost/Projects/js/newsirc/node_modules/istanbul-api/node_modules/istanbul-lib-report/lib/tree.js:115:32)
    at ReportNode.Node.visit (/Users/netghost/Projects/js/newsirc/node_modules/istanbul-api/node_modules/istanbul-lib-report/lib/tree.js:126:5)
    at Tree.visit (/Users/netghost/Projects/js/newsirc/node_modules/istanbul-api/node_modules/istanbul-lib-report/lib/tree.js:158:20)

Test Suites: 1 passed, 1 total
Tests:       2 passed, 2 total
Snapshots:   0 total
Time:        1.039s
Ran all test suites.

With a test ./__tests__/RSS_IO_test.js

describe('class RSS_IO', () => {
    const rssobj = new RSS_IO(localConfig.RSSUrls);
    it('starts construction at initialization', () => {
        expect(typeof rssobj).toBe('object');
    });

    it('has an array of rss_urls', () => {
        expect(typeof rssobj.rss_urls.length).toBe('number');
    });
});

of a class RSS_IO

class RSS_IO {

    constructor(rss_urls) {
            this.rss_urls = rss_urls;
    }
}

module.exports = RSS_IO;

Research

Looking at the file ./node_modules/istanbul-reports/lib/text/index.js around Line 133

function tableRow(node, context, colorizer, maxNameCols, level, skipEmpty) {
    var name = nodeName(node),
        metrics = node.getCoverageSummary(),
        isEmpty = metrics.isEmpty();
    if (skipEmpty && isEmpty) { return ''; }
    ...;
}

There seems to be a metrics object calling isEmpty either incorrectly by name/reference or not defined.

Ask

Is there any reason to why isEmpty() of the metrics object not be defined? Missing library? Missing install library?

Thank you

[ryan-lang]

facebook/jest#5772

[dazip]

https://github.com/istanbuljs/istanbuljs/pull/140

[risingsunomi]

@dazip I don't know how or where to implement --skip-empty through the jest settings in package.json

[risingsunomi]

@ryan-lang I have made my package.json

"devDependencies": {
    "eslint": "^4.18.2",
    "eslint-config-google": "^0.9.1",
    "istanbul": "^0.4.5",
    "istanbul-api": "^1.3.1",
    "istanbul-lib-report": "^1.1.3",
    "istanbul-reports": "1.1.4",
    "jest": "^22.4.2"
  }

but no fix

[ryan-lang]

@risingsunomi My workaround was to pin the following versions, delete node_modules and reinstall fresh. Although, this is shaky because you may have another dependency pulling in the newer broken version.

"istanbul-api": "1.2.2",
"istanbul-reports": "1.1.4",

[risingsunomi]

@ryan-lang ok thank you - trying that now

[risingsunomi]

@ryan-lang that worked! Thank you very much. Apprectiate it.

Fix in package.json

Delete your local node_modules

Put in your package.json

"devDependencies": {
    "eslint": "^4.18.2",
    "eslint-config-google": "^0.9.1",
    "istanbul": "^0.4.5",
    "istanbul-api": "1.2.2",
    "istanbul-reports": "1.1.4",
    "jest": "^22.4.2"
  },

With

"istanbul-api": "1.2.2",
"istanbul-reports": "1.1.4"