Add export of MdxjsEsmHast type, fix types

*   while this is practically equivalent to the current node type,
    this is meant for the hast space, which in the future could start diverging
    from mdast literals
*   Fix types to only allow `MdxjsEsm`, in hast, in root nodes: they’re not
    allowed in elements
*   Fix types to only allow `MdxjsEsm`, in mdast, in root nodes: they’re not
    allowed in other things that allow blocks (list items, block quotes,
    footnote definitions)

index.d.ts

@@ -1,13 +1,14 @@
-import type {Literal} from 'mdast'
 import type {Program} from 'estree-jsx'
+import type {Literal as HastLiteral} from 'hast'
+import type {Literal as MdastLiteral} from 'mdast'
 
 export {mdxjsEsmFromMarkdown, mdxjsEsmToMarkdown} from './lib/index.js'
 
 /**
  * MDX ESM (import/export) node.
  */
 // eslint-disable-next-line @typescript-eslint/consistent-type-definitions
-export interface MdxjsEsm extends Literal {
+export interface MdxjsEsm extends MdastLiteral {
   /**
    * Node type.
    */
@@ -31,31 +32,46 @@ export interface MdxjsEsm extends Literal {
 // eslint-disable-next-line @typescript-eslint/naming-convention
 export type MDXJSEsm = MdxjsEsm
 
-// Add nodes to content.
-declare module 'mdast' {
-  // eslint-disable-next-line @typescript-eslint/consistent-type-definitions
-  interface BlockContentMap {
+/**
+ * MDX ESM (import/export) node (for hast).
+ */
+// eslint-disable-next-line @typescript-eslint/consistent-type-definitions
+export interface MdxjsEsmHast extends HastLiteral {
+  /**
+   * Node type.
+   */
+  type: 'mdxjsEsm'
+
+  /**
+   * Data.
+   */
+  data?: {
     /**
-     * MDX ESM.
+     * Program node from estree.
      */
-    mdxjsEsm: MdxjsEsm
+    // eslint-disable-next-line @typescript-eslint/ban-types
+    estree?: Program | null | undefined
   }
 }
 
-declare module 'hast' {
+// Add nodes to mdast content.
+declare module 'mdast' {
   // eslint-disable-next-line @typescript-eslint/consistent-type-definitions
-  interface RootContentMap {
+  interface FrontmatterContentMap {
     /**
      * MDX ESM.
      */
     mdxjsEsm: MdxjsEsm
   }
+}
 
+// Add nodes to hast content.
+declare module 'hast' {
   // eslint-disable-next-line @typescript-eslint/consistent-type-definitions
-  interface ElementContentMap {
+  interface RootContentMap {
     /**
      * MDX ESM.
      */
-    mdxjsEsm: MdxjsEsm
+    mdxjsEsm: MdxjsEsmHast
   }
 }

readme.md

@@ -20,6 +20,7 @@
     *   [`mdxjsEsmFromMarkdown`](#mdxjsesmfrommarkdown)
     *   [`mdxjsEsmToMarkdown`](#mdxjsesmtomarkdown)
     *   [`MdxjsEsm`](#mdxjsesm)
+    *   [`MdxjsEsmHast`](#mdxjsesmhast)
 *   [HTML](#html)
 *   [Syntax](#syntax)
 *   [Syntax tree](#syntax-tree)
@@ -197,8 +198,25 @@ MDX ESM (import/export) node (TypeScript type).
 ###### Type
 
 ```ts
+import type {Program} from 'estree-jsx'
 import type {Literal} from 'mdast'
+
+interface MdxjsEsm extends Literal {
+  type: 'mdxjsEsm'
+  data?: {estree?: Program | null | undefined}
+}
+```
+
+### `MdxjsEsmHast`
+
+Same as [`MdxjsEsm`][api-mdxjs-esm], but registered with `@types/hast`
+(TypeScript type).
+
+###### Type
+
+```ts
 import type {Program} from 'estree-jsx'
+import type {Literal} from 'hast'
 
 interface MdxjsEsm extends Literal {
   type: 'mdxjsEsm'
@@ -227,7 +245,7 @@ The following interfaces are added to **[mdast][]** by this utility.
 
 ```idl
 interface MdxjsEsm <: Literal {
-  type: "mdxjsEsm"
+  type: 'mdxjsEsm'
 }
 ```
 
@@ -265,9 +283,10 @@ a *[parent][dfn-parent]*, that parent must be **[Root][dfn-root]**.
 ## Types
 
 This package is fully typed with [TypeScript][].
-It exports the additional type [`MdxjsEsm`][api-mdxjs-esm].
+It exports the additional types [`MdxjsEsm`][api-mdxjs-esm] and
+[`MdxjsEsmHast`][api-mdxjs-esm-hast].
 
-It also registers the node type with `@types/mdast`.
+It also registers the node type with `@types/mdast` and `@types/hast`.
 If you’re working with the syntax tree, make sure to import this utility
 somewhere in your types, as that registers the new node types in the tree.
 
@@ -389,14 +408,16 @@ abide by its terms.
 
 [dfn-root]: https://github.com/syntax-tree/mdast#root
 
-[dfn-flow-content]: #flowcontent-mdxjs-esm
-
 [remark-mdx]: https://mdxjs.com/packages/remark-mdx/
 
 [mdx]: https://mdxjs.com
 
+[dfn-flow-content]: #flowcontent-mdxjs-esm
+
 [api-mdxjs-esm-from-markdown]: #mdxjsesmfrommarkdown
 
 [api-mdxjs-esm-to-markdown]: #mdxjsesmtomarkdown
 
 [api-mdxjs-esm]: #mdxjsesm
+
+[api-mdxjs-esm-hast]: #mdxjsesmhast