fix(@angular/build): warn and remove jsdom launcher when used with karma #29953
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The jsdom package does not currently support execution of ESM scripts. Attempting to use the karma jsdom launcher will cause test failures with potentially unclear error messages after the tests have been built and have started to execute. The karma application builder test runner will now issue a warning describing the problem and remove the jsdom launcher from the `browsers` option. The warning will be shown while analyzing the options and prior to the actual start of the test process.
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alan-agius4
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Mar 27, 2025
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The jsdom package does not currently support execution of ESM scripts. Attempting to use the karma jsdom launcher will cause test failures with potentially unclear error messages after the tests have been built and have started to execute. The karma application builder test runner will now issue a warning describing the problem and remove the jsdom launcher from the
browsersoption. The warning will be shown while analyzing the options and prior to the actual start of the test process.