Enhancing TypeScript builtin objects in Netbeans using a custom plugin

Question

Enhancing TypeScript builtin objects in Netbeans using a custom plugin

While in the process of converting JavaScript code to TypeScript, I encountered a challenge with extending built-in objects using Object.defineProperty, such as String.prototype.

Object.defineProperty(String.prototype, 'testFunc',
{ value: function():string {return 'test';}
});

var s1:string = 'abc'.testFunc();             // Property 'testFunc' does not exist on type 'string'
var s2:string = String.prototype.testFunc();  // Property 'testFunc' does not exist on type 'String'


Object.defineProperty(Object, 'testFunc',
{ value: function():string {return 'test';}
});

var s:string = Object.testFunc();             // Property 'testFunc' does not exist on type 'ObjectConstructor'

Although it translates correctly into JavaScript, Netbeans 8.1 with a TypeScript plugin is displaying errors as shown in the comments above.

All my attempts using declare and interface have not produced any correct syntax. I am unsure how to make it work.

What is the best way to extend built-in objects in TypeScript and have the IDE recognize it?

javascript netbeans typescript extend built-in

Answer 1

Answer №1

After numerous trials and errors, I finally cracked the code and found a solution that actually works. It seems to be doing exactly what I intended it to do.

interface String { strFunc:Function; }

Object.defineProperty(String.prototype, 'strFunc',
{ value: function():string {return 'test';}
});

var s1:string = 'abc'.strFunc();
var s2:string = String.prototype.strFunc();


interface ObjectConstructor { objFunc:Function; }

Object.defineProperty(Object, 'objFunc',
{ value: function():string {return 'test';}
});

var s:string = Object.objFunc();

// The objFunc method should not be used on strings:
var s:string = 'a string instance'.objFunc(); // Property 'testFunc' does not exist on type 'string'

Answer 2

After numerous trials and errors, I finally cracked the code and found a solution that actually works. It seems to be doing exactly what I intended it to do.

interface String { strFunc:Function; }

Object.defineProperty(String.prototype, 'strFunc',
{ value: function():string {return 'test';}
});

var s1:string = 'abc'.strFunc();
var s2:string = String.prototype.strFunc();


interface ObjectConstructor { objFunc:Function; }

Object.defineProperty(Object, 'objFunc',
{ value: function():string {return 'test';}
});

var s:string = Object.objFunc();

// The objFunc method should not be used on strings:
var s:string = 'a string instance'.objFunc(); // Property 'testFunc' does not exist on type 'string'

Enhancing TypeScript builtin objects in Netbeans using a custom plugin

Answer №1

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