error TS5023: Unknown compiler option 'strictTemplates'

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Compiling an angular application (v10) fails with this error.

An unhandled exception occurred: tsconfig.json:14:5 - error TS5023: Unknown compiler option 'strictTemplates'.

14     "strictTemplates": true,
       ~~~~~~~~~~~~~~~~~
tsconfig angular typescript ivy
1 Answers

strictTemplates is a parameter for the angular compiler.

In your tsconfig.json: move the parameter inside angularCompilerOptions

"angularCompilerOptions": {
  ...,
  "strictTemplates": true,
  ...
}

Angular >= 9 is necessary.

More info here: https://angular.io/guide/template-typecheck

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