Static variable used inside instance method of a decorated subclass, will introduce run time errors.

[joeuy]

TypeScript Version: 2.4.0-dev.20170609

Code

function decorate(target) { }

class A { }

@decorate
class B extends A {
    private static readonly STATIC = 'value';
    foo() {
        return B.STATIC;
    }
}

Actual behavior: (compiled js)
look below: __extends(B, _super); is called with hoisted B = undefined.

var __extends = (this && this.__extends) || (function () {
    var extendStatics = Object.setPrototypeOf ||
        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
    return function (d, b) {
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
    return c > 3 && r && Object.defineProperty(target, key, r), r;
};

function decorate(target) { }
var A = (function () {
    function A() {
    }
    return A;
}());
var B = (function (_super) {
    __extends(B, _super);
    var B = B_1 = function B() {
        return _super !== null && _super.apply(this, arguments) || this;
    };
    B.prototype.foo = function () {
        return B_1.STATIC;
    };
    B.STATIC = 'value';
    B = B_1 = __decorate([
        decorate
    ], B);
    return B;
    var B_1;
}(A));

[normalser]

Having the same issue. Had to downgrade tsc version.
Seems it got introduced with 2.4.0-dev.20170601

[basarat]

Maybe there should be a "run emitted JS" category of tests. Neverthless thanks for the quick fix 🌹 ❤️