Typescript error: Property 'assign' does not exist on type 'ObjectConstructor' for Line 146 and Line 147

[dasis]

Line 146: this.settings = Object.assign(this.defaultSettings, this.settings);
Line 147: this.texts = Object.assign(this.defaultTexts, this.texts);

I added these lines to fix it on my end.
//Reference: microsoft/TypeScript#3889
interface ObjectCtor extends ObjectConstructor {
assign(target: any, ...sources: any[]): any;
}
declare var Object: ObjectCtor;

Typescript Version: 1.0.3.0
Not sure if the latest typescript would've fixed my issue :)

[softsimon]

I think you need the es6 polyfill for this.

[nicholasguyett]

Object.assign does not exist in ES5, so you either need to

• include a polyfill in your project (such as core-js)
• OR configure your tsconfig to build for ES6 or ES2015 (this may require a new version of typescript, I'm not certain
• OR include a type typings reference for ES6 libraries (this is what I am using in my current project as I have one browser to support that does not support the full ES6 syntax, but does support Object.assign and other new features)