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

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

import { isFunction } from '@nestjs/common/utils/shared.utils.js';
import { applyIsOptionalDecorator, applyValidateIfDefinedDecorator, inheritPropertyInitializers, inheritTransformationMetadata, inheritValidationMetadata, } from '@nestjs/mapped-types';
import { Field } from '../decorators/index.js';
import { MetadataLoader } from '../plugin/metadata-loader.js';
import { METADATA_FACTORY_NAME } from '../plugin/plugin-constants.js';
import { getFieldsAndDecoratorForType } from '../schema-builder/utils/get-fields-and-decorator.util.js';
import { applyFieldDecorators } from './type-helpers.utils.js';
function isPartialTypeOptions(optionsOrDecorator) {
    return (optionsOrDecorator &&
        ('decorator' in optionsOrDecorator ||
            'omitDefaultValues' in optionsOrDecorator ||
            'skipNullProperties' in optionsOrDecorator));
}
export function PartialType(classRef, optionsOrDecorator) {
    const { fields, decoratorFactory } = getFieldsAndDecoratorForType(classRef);
    class PartialObjectType {
        constructor() {
            inheritPropertyInitializers(this, classRef);
        }
    }
    let decorator;
    let omitDefaultValues = false;
    let skipNullProperties = true;
    if (isPartialTypeOptions(optionsOrDecorator)) {
        decorator = optionsOrDecorator.decorator;
        omitDefaultValues = optionsOrDecorator.omitDefaultValues;
        skipNullProperties = optionsOrDecorator.skipNullProperties ?? true;
    }
    else {
        decorator = optionsOrDecorator;
    }
    const applyPartialDecoratorFn = skipNullProperties === false
        ? applyValidateIfDefinedDecorator
        : applyIsOptionalDecorator;
    if (decorator) {
        decorator({ isAbstract: true })(PartialObjectType);
    }
    else {
        decoratorFactory({ isAbstract: true })(PartialObjectType);
    }
    inheritValidationMetadata(classRef, PartialObjectType);
    inheritTransformationMetadata(classRef, PartialObjectType);
    function applyFields(fields) {
        fields.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,
                nullable: true,
                defaultValue: omitDefaultValues ? undefined : item.options.defaultValue,
            })(PartialObjectType.prototype, item.name);
            applyPartialDecoratorFn(PartialObjectType, item.name);
            applyFieldDecorators(PartialObjectType, 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);
    });
    if (PartialObjectType[METADATA_FACTORY_NAME]) {
        const pluginFields = Object.keys(PartialObjectType[METADATA_FACTORY_NAME]());
        pluginFields.forEach((key) => applyPartialDecoratorFn(PartialObjectType, key));
    }
    Object.defineProperty(PartialObjectType, 'name', {
        value: `Partial${classRef.name}`,
    });
    return PartialObjectType;
}