Refactor to move implementation to lib/

Author: wooorm

.gitignore

@@ -1,7 +1,8 @@
 coverage/
 node_modules/
 .DS_Store
-index.d.ts
-test.d.ts
+*.d.ts
 *.log
 yarn.lock
+!/complex-types.d.ts
+!/index.d.ts

complex-types.d.ts

@@ -1,64 +1,4 @@
-import type {Literal} from 'mdast'
+// To do: next major: remove this file.
+export type {Math, InlineMath} from './index.js'
 
-// eslint-disable-next-line @typescript-eslint/consistent-type-definitions
-export interface Math extends Literal {
-  type: 'math'
-  meta?: string | null
-}
-
-// eslint-disable-next-line @typescript-eslint/consistent-type-definitions
-export interface InlineMath extends Literal {
-  type: 'inlineMath'
-}
-declare module 'mdast-util-from-markdown' {
-  // eslint-disable-next-line @typescript-eslint/consistent-type-definitions
-  interface CompileData {
-    /**
-     * Whether we’re in math (flow).
-     */
-    mathFlowInside?: boolean | undefined
-  }
-}
-
-declare module 'mdast-util-to-markdown' {
-  // eslint-disable-next-line @typescript-eslint/consistent-type-definitions
-  interface ConstructNameMap {
-    /**
-     * Math (flow).
-     *
-     * ```markdown
-     * > | $$
-     *     ^^
-     * > | a
-     *     ^
-     * > | $$
-     *     ^^
-     * ```
-     */
-    mathFlow: 'mathFlow'
-
-    /**
-     * Math (flow) meta flag.
-     *
-     * ```markdown
-     * > | $$a
-     *       ^
-     *   | b
-     *   | $$
-     * ```
-     */
-    mathFlowMeta: 'mathFlowMeta'
-  }
-}
-
-declare module 'mdast' {
-  // eslint-disable-next-line @typescript-eslint/consistent-type-definitions
-  interface StaticPhrasingContentMap {
-    inlineMath: InlineMath
-  }
-
-  // eslint-disable-next-line @typescript-eslint/consistent-type-definitions
-  interface BlockContentMap {
-    math: Math
-  }
-}
+/// <reference types="./index.js" />

index.d.ts

@@ -0,0 +1,72 @@
+import type {Literal} from 'mdast'
+
+export {mathFromMarkdown, mathToMarkdown} from './lib/index.js'
+
+export type {ToOptions} from './lib/index.js'
+
+// eslint-disable-next-line @typescript-eslint/consistent-type-definitions
+export interface Math extends Literal {
+  type: 'math'
+  meta?: string | null
+}
+
+// eslint-disable-next-line @typescript-eslint/consistent-type-definitions
+export interface InlineMath extends Literal {
+  type: 'inlineMath'
+}
+
+// Add custom data tracked to turn markdown into a tree.
+declare module 'mdast-util-from-markdown' {
+  // eslint-disable-next-line @typescript-eslint/consistent-type-definitions
+  interface CompileData {
+    /**
+     * Whether we’re in math (flow).
+     */
+    mathFlowInside?: boolean | undefined
+  }
+}
+
+// Add custom data tracked to turn a tree into markdown.
+declare module 'mdast-util-to-markdown' {
+  // eslint-disable-next-line @typescript-eslint/consistent-type-definitions
+  interface ConstructNameMap {
+    /**
+     * Math (flow).
+     *
+     * ```markdown
+     * > | $$
+     *     ^^
+     * > | a
+     *     ^
+     * > | $$
+     *     ^^
+     * ```
+     */
+    mathFlow: 'mathFlow'
+
+    /**
+     * Math (flow) meta flag.
+     *
+     * ```markdown
+     * > | $$a
+     *       ^
+     *   | b
+     *   | $$
+     * ```
+     */
+    mathFlowMeta: 'mathFlowMeta'
+  }
+}
+
+// Add nodes to tree.
+declare module 'mdast' {
+  // eslint-disable-next-line @typescript-eslint/consistent-type-definitions
+  interface StaticPhrasingContentMap {
+    inlineMath: InlineMath
+  }
+
+  // eslint-disable-next-line @typescript-eslint/consistent-type-definitions
+  interface BlockContentMap {
+    math: Math
+  }
+}