adding property to javascript object in typescript without errors -

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i found this article quite interesting, not me when try extend global variable window.

test.ts

window.test = {}; //error: property 'test' not exist on type 'window'.  (function (test) { //do stuff } (window.test)); //build: property 'test' not exist on type 'window'

error message:

error: property 'test' not exist on type 'window'.

how can solve ?

it's called declaration merging:

interface window {     test(): void; }  window.test = function() {     // ever }

(code in playground)

as can see need declare new method in window interface , compiler won't complain when add actual implementation.


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