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28 lines
1.0 KiB
28 lines
1.0 KiB
import {Canonical, CanonicalDefinition} from './Canonical.ts'
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import Instantiable, {isInstantiable} from '../../../di/src/type/Instantiable.ts'
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/**
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* Error thrown when the item returned from a canonical definition file is not the expected item.
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* @extends Error
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*/
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export class InvalidCanonicalExportError extends Error {
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constructor(name: string) {
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super(`Unable to import canonical item from "${name}". The default export of this file is invalid.`)
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}
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}
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/**
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* Base class for Canonical units which return instantiated versions of the classes
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* defined in those files. The files should export default clases which are Instantiable.
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* @extends Canonical
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*/
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export class InstantiableCanonical<T> extends Canonical<Instantiable<T>> {
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public async init_canonical_item(def: CanonicalDefinition): Promise<Instantiable<T>> {
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if ( isInstantiable(def.imported.default) ) {
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return this.make(def.imported.default)
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}
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throw new InvalidCanonicalExportError(def.original_name)
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}
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}
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