I'm not sure if this is a silly question, but I was wondering if it's necessary to use definitely typed (.d.ts) versions of external libraries when working with Typescript. Currently, my code base uses jQuery and Knockout in the traditional manner (with scripts/CDNs in the HTML file). I need to transition this code base to Typescript and I'm curious if there will be any complications in keeping the jQuery and Knockout references as they are while using Typescript.
Actually, it is not necessary.
They serve mainly for tooling assistance (such as intellisense) and for compile-time checks to describe the external library's API. If you are not concerned with these aspects, then you can choose not to include them. However, you may need to inform Typescript about the global variables that these libraries provide.
For instance:
declare var ko, $, jQuery;
ko.applyBindings({}, $(".root-container"))[0];
There are more efficient methods than using these "declare"s. In fact, this is precisely what ".d.ts" files consist of: smart declarations related to the library being utilized. Take a look at the Knockout ".d.ts" file (start from the bottom, I would suggest), they are not overly complex.
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