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Angular reports NG8117 when a text interpolation refers to a function without calling it. If you want to display the function’s return value, add parentheses—for example, change {{ getValue }} to {{ getValue() }}. The diagnostic is an extended check that requires strictTemplates.
What NG8117 means
NG8117 detects an uninvoked function in a text interpolation. In Angular’s example, the component defines a getValue() function that returns 'value', but the template contains {{ getValue }}. That expression refers to the function; it does not call the function to obtain its return value. Angular describes the rule as: “Functions in text interpolation should be invoked to return a value.” Angular’s NG8117 documentation
How to fix NG8117
Call the function in the interpolation by adding parentheses:
{{ getValue() }}Use this correction when the intended displayed value is the function’s result. The key difference is between a function reference, {{ getValue }}, and a function invocation, {{ getValue() }}.
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What compiler setting controls the diagnostic?
Angular’s extended diagnostics require strictTemplates. The NG8117 check has no additional prerequisite. If you need to suppress this specific diagnostic, set its check to suppress in tsconfig.json:
{
"angularCompilerOptions": {
"extendedDiagnostics": {
"checks": {
"uninvokedFunctionInTextInterpolation": "suppress"
}
}
}
}Suppressing NG8117 only stops Angular from emitting the diagnostic. It does not call the function or make the interpolation display its return value; use {{ getValue() }} when that result is what the template should show.
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