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I have a build issue while running a unit test case in angular 9. environment Angular CLI: 9.1.12 Node: 15.1.0 OS: win32 x64 error:

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Krzysztof Madej
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Nihal Ahmed Choudhary
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2 Answers2

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Same error was coming for me too. I commented the if else block in nodemoodules/webpack-dev-middleware/lib/util.js 130. It is because it has undefined value. Now it is working fine. I am beginner, I don't know about the impact else where.

Suryaprakash
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It's an issue with karma on node v15, you'll have to downgrade to 14.

Issue at Karma: https://github.com/karma-runner/karma/issues/3571

See also: [karma-server]: TypeError: Cannot read property 'range' of undefined - Angular Unit Testing in CI environment

Joran
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