error TS5023: Unknown compiler option 'strictTemplates'

Question

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,
       ~~~~~~~~~~~~~~~~~

Answer 1

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