@trademe/ensure/dist/singleton/singleton.js

Utility decorators for Angular applications

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
// Dependencies:
var ensure_error_1 = require("../ensure-error");
function Singleton() {
    return function (injectable) {
        var singleton = createSingleton(injectable);
        setPrototype(injectable, singleton);
        setMetadata(injectable, singleton);
        setName(injectable, singleton);
        return singleton;
    };
}
exports.Singleton = Singleton;
function createSingleton(injectable) {
    var instantiated = null;
    return function singleton() {
        if (!instantiated) {
            instantiated = true;
            this._reset = function () { return instantiated = false; };
            return injectable.apply(this, arguments);
        }
        throw new ensure_error_1.EnsureError("\n            " + injectable.name + " is a singleton and must not be instantiated multiple times.\n        ");
    };
}
function setMetadata(injectable, singleton) {
    for (var _i = 0, _a = Reflect.getOwnMetadataKeys(injectable); _i < _a.length; _i++) {
        var key = _a[_i];
        var metadata = Reflect.getOwnMetadata(key, injectable);
        Reflect.defineMetadata(key, metadata, singleton);
    }
}
function setName(injectable, singleton) {
    var fnName = injectable.name + "Singleton";
    singleton.prototype.toString = function () { return fnName; };
    Object.defineProperty(singleton, 'name', { value: fnName });
}
function setPrototype(injectable, singleton) {
    singleton.prototype = Object.create(injectable.prototype);
}
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