React: Don't show decorators in JSX snippets

code/lib/preview-api/src/modules/addons/hooks.ts

@@ -134,7 +134,7 @@ function hookify<TRenderer extends Renderer>(
   decorator: DecoratorFunction<TRenderer>
 ): DecoratorFunction<TRenderer>;
 function hookify<TRenderer extends Renderer>(fn: AbstractFunction) {
-  return (...args: any[]) => {
+  const hookified = (...args: any[]) => {
     const { hooks }: { hooks: HooksContext<TRenderer> } =
       typeof args[0] === 'function' ? args[1] : args[0];
 
@@ -172,6 +172,9 @@ function hookify<TRenderer extends Renderer>(fn: AbstractFunction) {
     hooks.currentDecoratorName = prevDecoratorName;
     return result;
   };
+
+  hookified.originalFn = fn;
+  return hookified;
 }
 
 // Counter to prevent infinite loops.

code/renderers/react/src/applyDecorators.ts

@@ -0,0 +1,19 @@
+import { defaultDecorateStory } from '@storybook/preview-api';
+import type { LegacyStoryFn, DecoratorFunction } from '@storybook/types';
+
+import type { ReactRenderer } from './types';
+import { jsxDecorator } from './docs/jsxDecorator';
+
+export const applyDecorators = (
+  storyFn: LegacyStoryFn<ReactRenderer>,
+  decorators: DecoratorFunction<ReactRenderer>[]
+): LegacyStoryFn<ReactRenderer> => {
+  // @ts-expect-error originalFn is not defined on the type for decorator. This is a temporary fix
+  // that we will remove soon (likely) in favour of a proper concept of "inner" decorators.
+  const jsxIndex = decorators.findIndex((d) => d.originalFn === jsxDecorator);
+
+  const reorderedDecorators =
+    jsxIndex === -1 ? decorators : [...decorators.splice(jsxIndex, 1), ...decorators];
+
+  return defaultDecorateStory(storyFn, reorderedDecorators);
+};

code/renderers/react/src/config.ts

@@ -5,3 +5,5 @@ export const parameters = { renderer: 'react', ...docsParams };
 export { decorators, argTypesEnhancers } from './docs/config';
 
 export { render, renderToCanvas } from './render';
+
+export { applyDecorators } from './applyDecorators';

code/renderers/react/template/stories/decorators.stories.tsx

@@ -1,11 +1,12 @@
 import type { FC } from 'react';
-import React from 'react';
+import React, { useContext, createContext } from 'react';
 import type { StoryObj, Meta } from '@storybook/react';
 
 const Component: FC = () => <p>Story</p>;
 
 export default {
   component: Component,
+  tags: ['autodocs'],
   decorators: [
     (Story) => (
       <>
@@ -26,3 +27,22 @@ export const All: StoryObj<typeof Component> = {
     ),
   ],
 };
+
+// This story will error if `parameters.docs.source.excludeDecorators` is true:
+// See https://github.com/storybookjs/storybook/issues/21900
+const TestContext = createContext<boolean>(false);
+export const Context: StoryObj<typeof Component> = {
+  // parameters: { docs: { source: { excludeDecorators: true } } },
+  decorators: [
+    (Story) => (
+      <TestContext.Provider value>
+        <Story />
+      </TestContext.Provider>
+    ),
+  ],
+  render: function Render(args, context) {
+    const value = useContext(TestContext);
+    if (!value) throw new Error('TestContext not set, decorator did not run!');
+    return <p>Story</p>;
+  },
+};