refactor(editor): rename block-std to std (#11250)

Closes: BS-2946

blocksuite/docs/api/@blocksuite/std/index/functions/KeymapExtension.md

@@ -0,0 +1,49 @@
+[**BlockSuite API Documentation**](../../../../README.md)
+
+***
+
+[BlockSuite API Documentation](../../../../README.md) / [@blocksuite/std](../../README.md) / [index](../README.md) / KeymapExtension
+
+# Function: KeymapExtension()
+
+> **KeymapExtension**(`keymapFactory`, `options`?): `ExtensionType`
+
+Create a keymap extension.
+
+## Parameters
+
+### keymapFactory
+
+(`std`) => `Record`\<`string`, `UIEventHandler`\>
+
+Create keymap of the extension.
+It should return an object with `keymap` and `options`.
+
+`keymap` is a record of keymap.
+
+### options?
+
+`EventOptions`
+
+`options` is an optional object that restricts the event to be handled.
+
+## Returns
+
+`ExtensionType`
+
+## Example
+
+```ts
+import { KeymapExtension } from '@blocksuite/std';
+
+const MyKeymapExtension = KeymapExtension(std => {
+  return {
+    keymap: {
+      'mod-a': SelectAll
+    }
+    options: {
+      flavour: 'affine:paragraph'
+    }
+  }
+});
+```