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Update TypeScript.md #4126

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Expand Up @@ -643,10 +643,11 @@ Inheritance](https://dev.to/ethanarrowood/is-declaration-merging-and-generic-inh
#### Using a Plugin

Using a Fastify plugin in TypeScript is just as easy as using one in JavaScript.
Import the plugin with `import/from` and you're all set -- except there is one
exception users should be aware of.
Import the plugin with `import/from` and you're all set.

Fastify plugins use declaration merging to modify existing Fastify type
> Using `require` won't load the type definitions properly and may cause a type errors

One exception users should be aware of is that Fastify plugins use declaration merging to modify existing Fastify type
interfaces (check out the previous two examples for more details). Declaration
merging is not very _smart_, meaning if the plugin type definition for a plugin
is within the scope of the TypeScript interpreter, then the plugin types will be
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