CSF: Promote args/argTypes to first-class metadata

examples/official-storybook/stories/core/args.stories.js

@@ -54,7 +54,7 @@ export const PassedToStory = inputArgs => {
 };
 
 PassedToStory.story = {
-  parameters: { argTypes: { name: { defaultValue: 'initial' } } },
+  argTypes: { name: { defaultValue: 'initial' } },
 };
 
 PassedToStory.propTypes = {

lib/client-api/README.md

@@ -70,7 +70,7 @@ For instance, for this story:
 
 ```js
 export MyStory = ....
-MyStory.story = { parameters: {
+MyStory.story = {
   argTypes: {
     primary: { defaultValue: true, /* other things */ },
     size: { /* other things */ },
@@ -80,7 +80,7 @@ MyStory.story = { parameters: {
     size: 'large',
     extra: 'prop',
   }
-}}
+}
 ```
 
 Then `context.args` will default to `{ primary: true, size: 'large', extra: 'prop' }`.

lib/core/README.md

@@ -14,15 +14,15 @@ The `start` module initiaizes all the submodules:
 
 - `StoryStore` (from `@storybook/client-api`) - stores the stories and their state as well as the current selection or error.
 - `ClientApi` (from `@storybook/client-api`) - provides the entry point for `storiesOf()` API calls; re-exported by each framework.
-- `ConfigApi` (from `@storybook/client-api`) - provides the configure API (wrapped by `makeConfigure` below).
+- `ConfigApi` (from `@storybook/client-api`) - provides the configure API (wrapped by `loadCsf` below).
 - `StoryRenderer` - controls the HTML that is rendered in the preview (calling the `render` function with the current story at appropriate times).
 - `url.js` - controls the URL in the preview and sets the selection based on it.
-- `makeConfigure` - loads CSF files from `require.context()` calls and uses `ClientApi` to load them into the store.
+- `loadCsf` - loads CSF files from `require.context()` calls and uses `ClientApi` to load them into the store.
 
 Each module uses the channel to communicate with each other and the manager. Each module also has direct access to the story store.
 
 ### Events on startup
 
-The store can only be changed during "configuration". The `ConfigApi` will call `store.startConfiguration()`, then the user code (or `makeConfigure`'s loader) which will use client API to load up stories. At the end of the user's code the `ConfigApi` will call `store.finishConfiguration()`. At this point the `SET_STORIES` event is emitted and the stories are transmitted to the manager.
+The store can only be changed during "configuration". The `ConfigApi` will call `store.startConfiguration()`, then the user code (or `loadCsf`'s loader) which will use client API to load up stories. At the end of the user's code the `ConfigApi` will call `store.finishConfiguration()`. At this point the `SET_STORIES` event is emitted and the stories are transmitted to the manager.
 
 The `SET_CURRENT_STORY` "command" event can be used to set the selection on the store. However only once this has been recieved _and_ configuration is over will the store use the `RENDER_CURRENT_STORY` to tell the `StoryRenderer` to render it.

lib/core/src/client/preview/makeConfigure.test.ts → lib/core/src/client/preview/loadCsf.test.ts

@@ -1,7 +1,7 @@
 import { ConfigApi, ClientApi, StoryStore } from '@storybook/client-api';
 import { RequireContext } from './types';
 
-import { makeConfigure } from './makeConfigure';
+import { loadCsf } from './loadCsf';
 
 let cbs: ((data: any) => void)[];
 let mod: NodeModule;
@@ -39,7 +39,7 @@ function makeMocks() {
   } as unknown) as ClientApi;
 
   const context = { configApi, storyStore, clientApi };
-  const configure = makeConfigure(context);
+  const configure = loadCsf(context);
   return { ...context, configure };
 }
 
@@ -52,7 +52,7 @@ function makeRequireContext(map: Record<string, any>): RequireContext {
   });
 }
 
-describe('core.preview.makeConfigure', () => {
+describe('core.preview.loadCsf', () => {
   it('calls storiesOf and add correctly from CSF exports', () => {
     const { configure, clientApi } = makeMocks();
 
@@ -197,7 +197,7 @@ describe('core.preview.makeConfigure', () => {
     });
   });
 
-  it('allows setting component parameters and decorators', () => {
+  it('allows setting component parameters, decorators, and args/argTypes', () => {
     const { configure, clientApi } = makeMocks();
 
     const decorator = jest.fn();
@@ -207,6 +207,8 @@ describe('core.preview.makeConfigure', () => {
           title: 'a',
           parameters: { x: 'y' },
           decorators: [decorator],
+          args: { b: 1 },
+          argTypes: { b: 'string' },
         },
         x: () => 0,
       },
@@ -215,11 +217,13 @@ describe('core.preview.makeConfigure', () => {
 
     const mockedStoriesOf = clientApi.storiesOf as jest.Mock;
     const aApi = mockedStoriesOf.mock.results[0].value;
-    expect(aApi.addParameters).toHaveBeenCalledWith(expect.objectContaining({ x: 'y' }));
+    expect(aApi.addParameters).toHaveBeenCalledWith(
+      expect.objectContaining({ x: 'y', args: { b: 1 }, argTypes: { b: 'string' } })
+    );
     expect(aApi.addDecorator).toHaveBeenCalledWith(decorator);
   });
 
-  it('allows setting story parameters and decorators', () => {
+  it('allows setting story parameters and decorators, and args/argTypes', () => {
     const { configure, clientApi } = makeMocks();
 
     const decorator = jest.fn();
@@ -232,6 +236,8 @@ describe('core.preview.makeConfigure', () => {
           story: {
             parameters: { x: 'y' },
             decorators: [decorator],
+            args: { b: 1 },
+            argTypes: { b: 'string' },
           },
         }),
       },
@@ -244,6 +250,8 @@ describe('core.preview.makeConfigure', () => {
       x: 'y',
       decorators: [decorator],
       __id: 'a--x',
+      args: { b: 1 },
+      argTypes: { b: 'string' },
     });
   });
 

lib/core/src/client/preview/makeConfigure.ts → lib/core/src/client/preview/loadCsf.ts

@@ -88,10 +88,12 @@ const loadStories = (
     const {
       title: kindName,
       id: componentId,
-      parameters: params,
-      decorators: decos,
+      parameters: kindParameters,
+      decorators: kindDecorators,
       component,
       subcomponents,
+      args: kindArgs,
+      argTypes: kindArgTypes,
     } = meta;
     // We pass true here to avoid the warning about HMR. It's cool clientApi, we got this
     // todo discuss: TS now wants a NodeModule; should we fix this differently?
@@ -103,38 +105,44 @@ const loadStories = (
       component,
       subcomponents,
       fileName: currentExports.get(fileExports),
-      ...params,
+      ...kindParameters,
+      args: kindArgs,
+      argTypes: kindArgTypes,
     });
 
     // todo add type
-    (decos || []).forEach((decorator: any) => {
+    (kindDecorators || []).forEach((decorator: any) => {
       kind.addDecorator(decorator);
     });
 
     Object.keys(exports).forEach(key => {
       if (isExportStory(key, meta)) {
         const storyFn = exports[key];
-        const { name, parameters, decorators } = storyFn.story || {};
+        const { name, parameters, decorators, args, argTypes } = storyFn.story || {};
         if (parameters && parameters.decorators) {
           deprecate(() => {},
           `${kindName} => ${name || key}: story.parameters.decorators is deprecated; use story.decorators instead.`)();
         }
         const decoratorParams = decorators ? { decorators } : null;
         const exportName = storyNameFromExport(key);
         const idParams = { __id: toId(componentId || kindName, exportName) };
-        kind.add(name || exportName, storyFn, {
+
+        const storyParams = {
           ...parameters,
           ...decoratorParams,
           ...idParams,
-        });
+          args,
+          argTypes,
+        };
+        kind.add(name || exportName, storyFn, storyParams);
       }
     });
   });
   previousExports = currentExports;
 };
 
 let loaded = false;
-export const makeConfigure = ({
+export const loadCsf = ({
   clientApi,
   storyStore,
   configApi,

lib/core/src/client/preview/start.ts

@@ -7,7 +7,7 @@ import Events from '@storybook/core-events';
 
 import { initializePath, setPath } from './url';
 import { RenderStoryFunction } from './types';
-import { makeConfigure } from './makeConfigure';
+import { loadCsf } from './loadCsf';
 import { StoryRenderer } from './StoryRenderer';
 
 const isBrowser =
@@ -93,6 +93,6 @@ export default function start(
     window.__STORYBOOK_ADDONS_CHANNEL__ = channel; // may not be defined
   }
 
-  const configure = makeConfigure({ clientApi, storyStore, configApi });
+  const configure = loadCsf({ clientApi, storyStore, configApi });
   return { configure, clientApi, configApi, forceReRender: () => storyRenderer.forceReRender() };
 }