Type Script Notes for Professionals: typed superset of JavaScript by Chahdi Othmane

Author:Chahdi, Othmane [Chahdi, Othmane]
Language: eng
Format: epub, azw3, mobi
Publisher: UNKNOWN
Published: 2021-07-28T00:00:00+00:00

Section 9.5: Add functions or properties to an existing interface

Let's suppose we have a reference to the JQuery type definition and we want to extend it to have additional functions from a plugin we included and which doesn't have an official type definition. We can easily extend it by declaring functions added by plugin in a separate interface declaration with the same JQuery name:

interface JQuery {

pluginFunctionThatDoesNothing(): void ;

// create chainable function

manipulateDOM( HTMLElement): JQuery; }

The compiler will merge all declarations with the same name into one - see declaration merging for more details.

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