nukak/querier/decorator/injectQuerier.js

flexible and efficient ORM, with declarative JSON syntax and smart type-safety

const metadataKey = Symbol('InjectQuerier');
export function InjectQuerier() {
    return (proto, key, index) => {
        const { constructor } = proto;
        if (!proto[metadataKey]) {
            proto[metadataKey] = new WeakMap();
        }
        if (!proto[metadataKey].has(constructor)) {
            proto[metadataKey].set(constructor, {});
        }
        const meta = proto[metadataKey].get(constructor);
        const isAlreadyInjected = key in meta;
        if (isAlreadyInjected) {
            throw new TypeError(`@InjectQuerier() can only appears once in '${constructor.name}.${key}'}`);
        }
        meta[key] = index;
    };
}
export function getInjectedQuerierIndex(service, key) {
    let proto = service.prototype;
    while (proto.constructor !== Object) {
        const meta = proto[metadataKey]?.get(proto.constructor);
        if (meta && key in meta) {
            return meta[key];
        }
        const keys = Object.getOwnPropertyNames(proto);
        const isOwnKey = keys.includes(key);
        if (isOwnKey) {
            return;
        }
        proto = Object.getPrototypeOf(proto);
    }
}
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