[docs] JSX framework integration READMEs (#8151)

packages/integrations/preact/README.md

@@ -115,6 +115,42 @@ Check out the [`pnpm` overrides](https://pnpm.io/package_json#pnpmoverrides) and
 > **Note**
 > Currently, the `compat` option only works for React libraries that export code as ESM. If an error happens during build-time, try adding the library to `vite.ssr.noExternal: ['the-react-library']` in your `astro.config.mjs` file.
 
+## Options
+
+### Combining multiple JSX frameworks
+
+When you are using multiple JSX frameworks (React, Preact, Solid) in the same project, Astro needs to determine which JSX framework-specific transformations should be used for each of your components. If you have only added one JSX framework integration to your project, no extra configuration is needed.
+
+Use the `include` (required) and `exclude` (optional) configuration options to specify which files belong to which framework. Provide an array of files and/or folders to `include` for each framework you are using. Wildcards may be used to include multiple file paths.
+
+We recommend placing common framework components in the same folder (e.g. `/components/react/` and `/components/solid/`) to make specifying your includes easier, but this is not required:
+
+```js
+import { defineConfig } from 'astro/config';
+import preact from '@astrojs/preact';
+import react from '@astrojs/react';
+import svelte from '@astrojs/svelte';
+import vue from '@astrojs/vue';
+import solid from '@astrojs/solid-js';
+
+export default defineConfig({
+  // Enable many frameworks to support all different kinds of components.
+  // No `include` is needed if you are only using a single JSX framework!
+  integrations: [
+		preact({
+			include: ['**/preact/*']
+		}),
+		react({
+			include: ['**/react/*']
+		}),
+		solid({
+			include: ['**/solid/*'],
+		}),
+  ]
+});
+```
+
+
 ## Examples
 
 - The [Astro Preact example](https://github.com/withastro/astro/tree/latest/examples/framework-preact) shows how to use an interactive Preact component in an Astro project.

packages/integrations/react/README.md

@@ -63,6 +63,39 @@ To use your first React component in Astro, head to our [UI framework documentat
 
 ## Options
 
+### Combining multiple JSX frameworks
+
+When you are using multiple JSX frameworks (React, Preact, Solid) in the same project, Astro needs to determine which JSX framework-specific transformations should be used for each of your components. If you have only added one JSX framework integration to your project, no extra configuration is needed.
+
+Use the `include` (required) and `exclude` (optional) configuration options to specify which files belong to which framework. Provide an array of files and/or folders to `include` for each framework you are using. Wildcards may be used to include multiple file paths.
+
+We recommend placing common framework components in the same folder (e.g. `/components/react/` and `/components/solid/`) to make specifying your includes easier, but this is not required:
+
+```js
+import { defineConfig } from 'astro/config';
+import preact from '@astrojs/preact';
+import react from '@astrojs/react';
+import svelte from '@astrojs/svelte';
+import vue from '@astrojs/vue';
+import solid from '@astrojs/solid-js';
+
+export default defineConfig({
+  // Enable many frameworks to support all different kinds of components.
+  // No `include` is needed if you are only using a single JSX framework!
+  integrations: [
+		preact({
+			include: ['**/preact/*']
+		}),
+		react({
+			include: ['**/react/*']
+		}),
+		solid({
+			include: ['**/solid/*'],
+		}),
+  ]
+});
+```
+
 ### Children parsing
 
 Children passed into a React component from an Astro component are parsed as plain strings, not React nodes.

packages/integrations/solid/README.md

@@ -61,6 +61,41 @@ To use your first SolidJS component in Astro, head to our [UI framework document
 - 💧 client-side hydration options, and
 - 🤝 opportunities to mix and nest frameworks together
 
+## Options
+
+### Combining multiple JSX frameworks
+
+When you are using multiple JSX frameworks (React, Preact, Solid) in the same project, Astro needs to determine which JSX framework-specific transformations should be used for each of your components. If you have only added one JSX framework integration to your project, no extra configuration is needed.
+
+Use the `include` (required) and `exclude` (optional) configuration options to specify which files belong to which framework. Provide an array of files and/or folders to `include` for each framework you are using. Wildcards may be used to include multiple file paths.
+
+We recommend placing common framework components in the same folder (e.g. `/components/react/` and `/components/solid/`) to make specifying your includes easier, but this is not required:
+
+```js
+import { defineConfig } from 'astro/config';
+import preact from '@astrojs/preact';
+import react from '@astrojs/react';
+import svelte from '@astrojs/svelte';
+import vue from '@astrojs/vue';
+import solid from '@astrojs/solid-js';
+
+export default defineConfig({
+  // Enable many frameworks to support all different kinds of components.
+  // No `include` is needed if you are only using a single JSX framework!
+  integrations: [
+		preact({
+			include: ['**/preact/*']
+		}),
+		react({
+			include: ['**/react/*']
+		}),
+		solid({
+			include: ['**/solid/*'],
+		}),
+  ]
+});
+```
+
 ## Troubleshooting
 
 For help, check out the `#support` channel on [Discord](https://astro.build/chat). Our friendly Support Squad members are here to help!