@toss/nestjs-aop/dist/create-decorator.js

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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.createDecorator = void 0;
const common_1 = require("@nestjs/common");
const utils_1 = require("./utils");
/**
 * @param metadataKey equal to 1st argument of Aspect Decorator
 * @param metadata The value corresponding to the metadata of WrapParams. It can be obtained from LazyDecorator's warp method and used.
 */
const createDecorator = (metadataKey, metadata) => {
    const aopSymbol = Symbol('AOP_DECORATOR');
    return (0, common_1.applyDecorators)(
    // 1. Add metadata to the method
    (target, propertyKey, descriptor) => {
        if (descriptor.get && descriptor.set) {
            throw new Error(`createDecorator cannot be applied to '${String(propertyKey)}' because it has both a getter and a setter. ` +
                `Separate them into different properties, or use a regular method instead.`);
        }
        return (0, utils_1.AddMetadata)(metadataKey, {
            originalFn: descriptor.value || descriptor.get || descriptor.set,
            metadata,
            aopSymbol,
        })(target, propertyKey, descriptor);
    }, 
    // 2. Wrap the method before the lazy decorator is executed
    (_, propertyKey, descriptor) => {
        const originalFn = descriptor.value || descriptor.get || descriptor.set;
        const wrapperFn = function (...args) {
            var _a;
            const wrappedFn = (_a = this[aopSymbol]) === null || _a === void 0 ? void 0 : _a[propertyKey];
            if (wrappedFn) {
                // If there is a wrapper stored in the method, use it
                return wrappedFn.apply(this, args);
            }
            // if there is no wrapper that comes out of method, call originalFn
            return originalFn.apply(this, args);
        };
        // Assign wrapper to the appropriate descriptor property
        if (descriptor.value !== undefined) {
            descriptor.value = wrapperFn;
        }
        else if (descriptor.get !== undefined) {
            descriptor.get = wrapperFn;
        }
        else if (descriptor.set !== undefined) {
            descriptor.set = wrapperFn;
        }
        /**
         * There are codes that using `function.name`.
         * Therefore the codes below are necessary.
         *
         * ex) @nestjs/swagger
         */
        Object.defineProperty(wrapperFn, 'name', {
            value: propertyKey.toString(),
            writable: false,
        });
        if (originalFn) {
            Object.setPrototypeOf(wrapperFn, originalFn);
        }
    });
};
exports.createDecorator = createDecorator;
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