The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Angular’s NG8112 diagnostic means a template declares a value with @let but never reads that value. Use the variable where it is needed, or remove the declaration. If neither is appropriate, Angular lets you suppress this specific check in tsconfig.json.
What NG8112 means
NG8112 flags an @let declaration whose value is never read in the template. For example, a template might declare fullName from a user’s first and last name but render only “Welcome,” without using fullName. Angular describes the diagnostic in its NG8112 documentation.
An unused declaration is not necessarily cost-free: Angular says its expression is evaluated whenever the template updates. If that expression calls a function, the function still runs even though the declared value is never used. The declaration may be leftover from refactoring, or it may reveal a value the template was meant to display.
Free tools Windows power users keep installed
One-click scans. No signup required.
How to fix NG8112
Use the value in the template
If the value is intended to appear or otherwise be used, reference the variable where appropriate. For example, add an interpolation such as {{fullName}} to the greeting.
#1 Best Overall
Remove the declaration
If the template does not need the value, delete the @let declaration. This is the direct fix for a leftover declaration.
Suppress the diagnostic when necessary
If the unused declaration must remain, Angular documents suppressing NG8112 with the unusedLetDeclaration extended-diagnostic setting in tsconfig.json:
{
"angularCompilerOptions": {
"extendedDiagnostics": {
"checks": {
"unusedLetDeclaration": "suppress"
}
}
}
}Use this setting only when the declaration cannot reasonably be used or removed; it silences this check rather than making the value useful.
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsQuick Recap
Rank #3
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.
