feat: add ability to opt out of type gen declare statement (#3765)

* feat: add ability to opt out of type gen declare statement

* chore: docs wording

docs/typescript/generating-types.mdx

@@ -18,6 +18,32 @@ payload generate:types
 
 You can run this command whenever you need to regenerate your types, and then you can use these types in your Payload code directly.
 
+### Disable declare statement
+
+By default, `generate:types` will add a `declare` statement to your types file, which automatically enables type inference within Payload.
+
+If you are using your `payload-types.ts` file in other repos, though, it might be better to disable this `declare` statement, so that you don't get any TS errors in projects that use your Payload types, but do not have Payload installed.
+
+```ts
+// payload.config.ts
+{
+  // ...
+  typescript: {
+    declare: false, // defaults to true if not set
+  },
+}
+```
+
+If you do disable the `declare` pattern, you'll need to manually add a `declare` statement to your code in order for Payload types to be recognized. Here's an example showing how to declare your types in your `payload.config.ts` file:
+
+```ts
+import { Config } from './payload-types'
+
+declare module 'payload' {
+  export interface GeneratedTypes extends Config {}
+}
+```
+
 ### Custom output file path
 
 You can specify where you want your types to be generated by adding a property to your Payload config: