All files / src/parameter/parameterBuilder GuardParameterBuilder.ts

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import type { ValidParameterTypeName, RawParameterType } from '../ValidParameterTypeName';
import type { IParameterBuilder } from './IParameterBuilder';
 
export class GuardParameterBuilder<TypeName extends ValidParameterTypeName, T extends RawParameterType<TypeName>> implements IParameterBuilder<TypeName, T> {
    public constructor(
        private readonly typeName: TypeName,
        private readonly typeGuard: (value: RawParameterType<TypeName>) => value is T
    ) {}
 
    public get expectedTypes(): Set<TypeName> {
        return new Set([this.typeName]);
    }
 
    public build(value: RawParameterType<TypeName>): T {
        if (!this.typeGuard(value))
            throw new Error('Invalid parameter, type guard failed.');
        return value;
    }
}