Constructor chain does not contain code added by class decorator #10840
Description
The example code decorates the class "TestClass" with a kind of inheritence (with the function "extender").
But this extension is not used if the instance of "TestClass" is created by a static method from the class "TestClass" (see console outputs).
export function startTest() {
console.debug("test 1");
new TestClass();
console.debug("test 2");
TestClass.createInstance();
console.debug("end test");
}
function extender(d: any, b: any) {
for (const p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
}
export function testDecorator(): ClassDecorator {
return <TFunction extends Function>(target: TFunction): TFunction => {
const func = <any>function (...args: any[]): any {
console.debug("decorator called");
target.apply(this, args);
}
extender(func, target);
return func;
}
}
@testDecorator()
export class TestClass {
public constructor() {
console.debug("constructor called");
}
public static createInstance() {
new TestClass();
}
}
Expected behavior:
with typescript@2.0.6
test 1
decorator called
constructor called
test 2
decorator called
constructor called
end test
Actual behavior:
with typescript@2.1.0-dev.201620161102
test 1
decorator called
constructor called
test 2
constructor called
end test