@nestjs/graphql/dist/type-helpers/pick-type.helper.js

Nest - modern, fast, powerful node.js web framework (@graphql)

import { isFunction } from '@nestjs/common/utils/shared.utils.js';
import { inheritPropertyInitializers, inheritTransformationMetadata, inheritValidationMetadata, } from '@nestjs/mapped-types';
import { Field } from '../decorators/index.js';
import { MetadataLoader } from '../plugin/metadata-loader.js';
import { getFieldsAndDecoratorForType } from '../schema-builder/utils/get-fields-and-decorator.util.js';
import { applyFieldDecorators } from './type-helpers.utils.js';
export function PickType(classRef, keys, decorator) {
    const { fields, decoratorFactory } = getFieldsAndDecoratorForType(classRef);
    const isInheritedPredicate = (propertyKey) => keys.includes(propertyKey);
    class PickObjectType {
        constructor() {
            inheritPropertyInitializers(this, classRef, isInheritedPredicate);
        }
    }
    if (decorator && decorator !== decoratorFactory) {
        decoratorFactory({ isAbstract: true })(PickObjectType);
        decorator({ isAbstract: true })(PickObjectType);
    }
    else {
        decoratorFactory({ isAbstract: true })(PickObjectType);
    }
    inheritValidationMetadata(classRef, PickObjectType, isInheritedPredicate);
    inheritTransformationMetadata(classRef, PickObjectType, isInheritedPredicate);
    function applyFields(fields) {
        fields
            .filter((item) => keys.includes(item.name))
            .forEach((item) => {
            if (isFunction(item.typeFn)) {
                // Execute type function eagerly to update the type options object (before "clone" operation)
                // when the passed function (e.g., @Field(() => Type)) lazily returns an array.
                item.typeFn();
            }
            Field(item.typeFn, { ...item.options })(PickObjectType.prototype, item.name);
            applyFieldDecorators(PickObjectType, item);
        });
    }
    applyFields(fields);
    // Register a refresh hook to update the fields when the serialized metadata
    // is loaded from file.
    MetadataLoader.addRefreshHook(() => {
        const { fields } = getFieldsAndDecoratorForType(classRef, {
            overrideFields: true,
        });
        applyFields(fields);
    });
    return PickObjectType;
}