fix: add missing type and missing documentation in README

Author: benjaminrobinet

README.md

@@ -40,7 +40,7 @@ You can provide your own React components to the renderer, both for blocks and m
 
 - **Blocks** are full-width elements, usually at the root of the content. The available options are:
   - paragraph
-  - heading (receives `level`)
+  - heading (receives `level` and `plainText`)
   - list (receives `format`)
   - quote
   - code (receives `plainText`)

src/BlocksRenderer.tsx

@@ -88,7 +88,7 @@ type Node = RootNode | NonTextInlineNode;
 type GetPropsFromNode<T> = Omit<T, 'type' | 'children'> & {
   children?: React.ReactNode;
   // For code blocks, add a plainText property that is created by this renderer
-  plainText?: T extends { type: 'code' } ? string : never;
+  plainText?: T extends { type: 'code' | 'heading' } ? string : never;
 };
 
 // Map of all block types to their matching React component