I have a JavaScript module structured like this
myJSModule.js
var myJSModule = function () {
var _public_ = {};
_public_.foo = function () {
}
return _public_;
}();
Now I am attempting to use it within a TypeScript function
myTypeScript.ts
namespace Custom {
export function foo111() {
myJSModule.foo(); // error: "Symbol myModule can't be properly resolved"
}
}
What is the correct approach to calling the foo method in myJSModule?
If you want to ensure proper type declaration in TypeScript, consider using an ambient declaration. While you can include the ambient declaration directly in your TypeScript file, it is often more manageable to store them in separate .d.ts files.
For example, you could create a file named myJSModule.d.ts:
declare var myJSModule: {
foo(): void;
}
By doing this, you are informing the compiler that the myJSModule variable exists and has the specified type.
Thanks to @Jared Smith's comment, a potential solution is presented.
By casting the window object to any, there is no need to declare an interface.
myTypeScript.ts
namespace Custom {
export function foo111() {
(<any>window).myJSModule.foo();
}
}
To learn more about this technique, check out the article here.
Simply define the module like this:
declare const myJSModule : any;
namespace Custom {
export function customFunction() {
myJSModule.someFunction();
}
}
If you possess a definition file for the JavaScript module, consider including it in your TypeScript configuration.
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