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What does Angular NG1001 mean?
NG1001 is Angular’s compiler error named “Argument Not Literal.” Angular’s NG1001 documentation says the decorators @NgModule, @Pipe, @Component, @Directive, and @Injectable accept only object literals as arguments. A variable that evaluates to an object is still a reference, not an object literal written directly in the decorator call.
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How do you fix NG1001?
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Find the decorator named in the compiler diagnostic.
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Check whether its argument is a variable or another non-literal expression, rather than an object literal.
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Move the metadata object into the decorator call itself. For example, change
@NgModule(moduleDefinition)to@NgModule({ /* metadata properties */ }), placing the actual metadata properties inside the braces. -
Rebuild the application and review any follow-on compiler diagnostics.
Why does Angular require a literal in a decorator?
Angular says the restriction makes compiler metadata extraction faster. Its documentation describes the stricter requirement as an Ivy change: Ivy compiles decorators by moving expressions into other locations in the class output. The documentation identifies this as a change from View Engine, but does not give a version boundary for when the behavior applies.
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@NgModule@Pipe@Component@Directive@Injectable
These are the decorators Angular lists as requiring object-literal arguments in its error guidance. The Angular Error Encyclopedia lists NG1001 among compiler errors.
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What if the error remains?
Confirm that the decorator argument itself contains the metadata object, rather than a reference to an object defined elsewhere. Then rebuild and read the updated diagnostic; the documented rule does not establish that every non-literal expression behaves identically across all compiler and Angular versions.
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