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Overview

Decorator errors are thrown during class decoration when metadata validation fails or when hook targets reference methods that don’t exist. Both are internal errors that indicate a developer configuration issue.

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Error Reference

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InvalidDecoratorMetadataError

Thrown when a decorator (e.g., @App, @Plugin, @FrontMcp) receives invalid metadata for a specific field.
PropertyTypeValue
codestringINVALID_DECORATOR_METADATA
statusCodenumber500
isPublicbooleanfalse
new InvalidDecoratorMetadataError(decoratorName: string, field: string, details: string)
Example: 
import { InvalidDecoratorMetadataError } from '@frontmcp/sdk';

throw new InvalidDecoratorMetadataError('App', 'name', 'must be a non-empty string');
// "@App invalid metadata for "name": must be a non-empty string"

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HookTargetNotDefinedError

Thrown when a hook references a target method that is not defined on the class.
PropertyTypeValue
codestringHOOK_TARGET_NOT_DEFINED
statusCodenumber500
isPublicbooleanfalse
new HookTargetNotDefinedError(method: string)
Example: 
import { HookTargetNotDefinedError } from '@frontmcp/sdk';

throw new HookTargetNotDefinedError('onBeforeExecute');
// "Hook target method "onBeforeExecute" is not defined"