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Hello @Cenk,
Welcome to Microsoft Q&A forum.
Please try to create another new standalone Typescript Angular project and check if the same issue appears.
If the same issue appears, please try to reinstall the corresponding workload(Node.js development), node.js and ng.
If the same issue doesn’t appear, then for the previous project, please try to clean project cache and rebuild it.
If it still doesn’t work, please try to install 20.9.0 LTS version of Node.js and check again.
Sincerely,
Tianyu
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