🐞 Bug report

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Is this a regression?

No

Description

When enabling the codeCoverage for ng test the test will not run and crash because it cannot find the source maps of our javascript files. We are in the process of converting our angularjs to angular.

I think the problem will be fixed if we convert all our js files to ts. But that introduces more errors than files. We have over 2000 javascript files.

🔬 Minimal Reproduction

🔥 Exception or Error

ERROR in ./src/main/javascript/structure/cases/hv-plan/hv-plan.module.js
Module build failed (from ./node_modules/coverage-istanbul-loader/lib/index.js):
Error: An error occurred while trying to read the map file at C:\Users\p289718\Projects\flow\flow-ui\src\main\javascript\structure\cases\hv-plan\hv-plan.module.js.map
Error: ENOENT: no such file or directory, open 'C:\Users\p289718\Projects\flow\flow-ui\src\main\javascript\structure\cases\hv-plan\hv-plan.module.js.map'
    at readFromFileMap (C:\Users\p289718\Projects\flow\flow-ui\node_modules\coverage-istanbul-loader\node_modules\convert-source-map\index.js:40:11)
    at new Converter (C:\Users\p289718\Projects\flow\flow-ui\node_modules\coverage-istanbul-loader\node_modules\convert-source-map\index.js:47:32)
    at Object.exports.fromMapFileComment (C:\Users\p289718\Projects\flow\flow-ui\node_modules\coverage-istanbul-loader\node_modules\convert-source-map\index.js:110:10)
    at Object.exports.fromMapFileSource (C:\Users\p289718\Projects\flow\flow-ui\node_modules\coverage-istanbul-loader\node_modules\convert-source-map\index.js:122:22)
    at Object.default_1 (C:\Users\p289718\Projects\flow\flow-ui\node_modules\coverage-istanbul-loader\lib\index.js:28:45)
 @ ./src/main/javascript/structure/structure.module.ts 228:0-58 230:101-113
 @ ./src/main/javascript/app/app.angularjs.module.ts
 @ ./src/main/javascript/flow-tests.ts

🌍 Your Environment

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/


Angular CLI: 9.0.0-rc.14
Node: 12.10.0
OS: win32 x64

Angular: 9.0.0-rc.14
... cli, common, compiler, compiler-cli, core, language-service
... platform-browser, platform-browser-dynamic, router, upgrade
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.803.24
@angular-devkit/build-angular     0.803.24
@angular-devkit/build-optimizer   0.803.24
@angular-devkit/build-webpack     0.803.24
@angular-devkit/core              8.3.24
@angular-devkit/schematics        9.0.0-rc.14
@ngtools/webpack                  8.3.24
@schematics/angular               9.0.0-rc.14
@schematics/update                0.900.0-rc.14
rxjs                              6.5.4
typescript                        3.7.3
webpack                           4.41.2

Anything else relevant?

Relevant angular.json part

"test": {
          "builder": "ngx-build-plus:karma",
          "options": {
            "main": "src/main/javascript/flow-tests.ts",
            "polyfills": "src/main/javascript/polyfills.ts",
            "reporters": ["progress"],
            "tsConfig": "tsconfig.spec.json",
            "karmaConfig": "karma.conf.js",
            "codeCoverage": true,
            "assets": [],
            "styles": [],
            "scripts": [],
            "extraWebpackConfig": "webpack.partial.js"
          }
        },

karma.conf

const path = require('path');

module.exports = function(config) {
    config.set({
        basePath : '',
        frameworks : ['jasmine', '@angular-devkit/build-angular'],
        files : [
            'src/main/javascript/flow-tests.ts'
        ],
        exclude : [],
        plugins : [
            require('karma-jasmine'),
            require('karma-chrome-launcher'),
            require('karma-coverage-istanbul-reporter'),
            require('@angular-devkit/build-angular/plugins/karma')
        ],
        coverageIstanbulReporter : {
            reports : [ 'html', 'text-summary' ],
            dir : path.join(__dirname, 'target'),
            fixWebpackSourcePaths : true,
            'report-config' : {
                html : { subdir : 'coverage' }
            },
            thresholds : {
                global : {
                    statements : 77.1,
                    branches : 62.7,
                    functions : 76.1,
                    lines : 77.0
                }
            }
        },
        junitReporter : {
            outputDir : 'target/surefire-reports-ui/'
        },
        port : 9876,
        colors : true,
        logLevel : config.LOG_INFO,
        autoWatch : false,
        browsers : ['ChromeHeadless'],
        singleRun : true,
        concurrency : Infinity
    });
};