bind-decorator/index.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var constants;
(function (constants) {
    constants.typeOfFunction = 'function';
    constants.boolTrue = true;
})(constants || (constants = {}));
function bind(target, propertyKey, descriptor) {
    if (!descriptor || (typeof descriptor.value !== constants.typeOfFunction)) {
        throw new TypeError("Only methods can be decorated with @bind. <" + propertyKey + "> is not a method!");
    }
    return {
        configurable: constants.boolTrue,
        get: function () {
            var bound = descriptor.value.bind(this);
            // Credits to https://github.com/andreypopp/autobind-decorator for memoizing the result of bind against a symbol on the instance.
            Object.defineProperty(this, propertyKey, {
                value: bound,
                configurable: constants.boolTrue,
                writable: constants.boolTrue
            });
            return bound;
        }
    };
}
exports.bind = bind;
exports.default = bind;