Angular 11 supports up to TypeScript version v4.1.5

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//if you have angular 11 and have an issue with the typescript version use the following command.

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npm update -g typescript@4.1

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//if you want to update your typescript to latest version.

npm update -g typescript@latest

Angular 7 uses TypeScript version 3.1

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//if you have angular 7 and have an issue with the typescript version use the following command.

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npm update -g typescript@3.1

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//if you want to update your typescript to latest version.

npm update -g typescript@latest

Angular 9 uses TypeScript version >=3.6.4 and <3.8.0 

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//if you have angular 9 and have an issue with the typescript version use the following command.

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npm update -g typescript@3.6.4

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//if you want to update your typescript to latest version.

npm update -g typescript@latest