@stnekroman/tstools/dist/decorators/SingletonGuard.js

Set of handy tools for TypeScript development

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.SingletonGuardError = void 0;
exports.SingletonGuard = SingletonGuard;
class SingletonGuardError extends Error {
}
exports.SingletonGuardError = SingletonGuardError;
function SingletonGuard() {
    let instanceRefCount = 0;
    return (ctr) => {
        function newConstructor(...args) {
            if (++instanceRefCount > 1) {
                throw new SingletonGuardError(`SingletonGuard: class ${ctr.name} cannot have more then one instance`);
            }
            return new ctr(...args);
        }
        newConstructor.prototype = ctr.prototype;
        return newConstructor;
    };
}