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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | 1x 1x 1x 3x 1x 2x 1x 1x | import type { ValidParameterTypeName, RawParameterType } from '../ValidParameterTypeName';
import type { IParameterBuilder } from './IParameterBuilder';
export class OptionalParameterBuilder<TypeName extends ValidParameterTypeName, T> implements IParameterBuilder<TypeName | 'object' | 'undefined', T | null> {
public constructor(
private readonly builder: IParameterBuilder<TypeName, T>
) {}
public get expectedTypes(): Set<TypeName | 'object' | 'undefined'> {
return new Set<TypeName | 'object' | 'undefined'>(this.builder.expectedTypes)
.add('object')
.add('undefined');
}
public build(value: RawParameterType<TypeName | 'object' | 'undefined'>): T | null {
if (value === null)
return null;
if (typeof value === 'object' && !(this.builder.expectedTypes as Set<string>).has('object'))
throw new Error('Value is unexpected an object.');
return this.builder.build(value as RawParameterType<TypeName>);
}
}
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