Angular strict template "error TS" type-check failure in CI

With strictTemplates enabled in angularCompilerOptions, the compiler type-checks template expressions like TypeScript code. A type mismatch in a binding produces an "error TS..." referencing the .html file, failing the CI build.

What this error means

ng build fails with "error TS2322: Type 'string' is not assignable to type 'number'" pointing at a template file and a property binding.

ng build

src/app/cart/cart.component.html:3:22 - error TS2322:
Type 'string' is not assignable to type 'number'.
3   <app-qty [count]="'5'"></app-qty>

Common causes

A binding type does not match the input type

strictTemplates checks that the bound expression matches the @Input type; passing a string to a number input is an error.

Possibly null/undefined values in strict null templates

With strict null checks, a binding that may be null/undefined against a non-nullable input fails type checking in the template.

How to fix it

Fix the binding to match the declared type

Read the TS code and the template location.
Correct the bound expression type (bind a number, guard a nullable, or fix the @Input type).
Rebuild to confirm the template type-checks.

cart.component.html

<!-- pass a number, not a string -->
<app-qty [count]="5"></app-qty>

Keep strict templates on and align types

Rather than disabling strictTemplates, fix inputs and bindings so types agree; strict templates catch real bugs before runtime.

tsconfig.json

"angularCompilerOptions": {
  "strictTemplates": true
}

How to prevent it

Enable strictTemplates locally so template type errors surface before CI.
Type @Input properties precisely and bind matching expressions.
Guard nullable values in templates under strict null checks.