feat(ui): expose onMount to CodeField (#10223)

This is useful for modifying the monaco instance, e.g. to add external
types to the editor:

```tsx
<CodeField
        autoComplete={autoComplete}
        field={props}
        forceRender={forceRender}
        key={key}
        onMount={(editor, monaco) => {
          console.log('editor mounted')
          monaco.languages.typescript.typescriptDefaults.setCompilerOptions({
            allowNonTsExtensions: true,
            moduleResolution: monaco.languages.typescript.ModuleResolutionKind.NodeJs,
            paths: {
              payload: ['file:///node_modules/payload/index.d.ts'],
            },
            target: monaco.languages.typescript.ScriptTarget.ESNext,
            typeRoots: ['node_modules/@types', 'node_modules/payload'],
          })
          const run = async () => {
            const types = await fetch('https://unpkg.com/payload@latest/dist/index.d.ts')
            const typesText = await types.text()
            monaco.languages.typescript.typescriptDefaults.addExtraLib(
              typesText,
              'file:///node_modules/payload/index.d.ts',
            )
          }
          void run()
        }}
        path={path}
        permissions={permissions}
        readOnly={readOnly}
        renderedBlocks={renderedBlocks}
        schemaPath={schemaPath}
        validate={validate}
      />
```

packages/payload/src/admin/fields/Code.ts

@@ -1,3 +1,4 @@
+import type { EditorProps } from '@monaco-editor/react'
 import type { MarkOptional } from 'ts-essentials'
 
 import type { CodeField, CodeFieldClient } from '../../fields/config/types.js'
@@ -20,6 +21,7 @@ type CodeFieldClientWithoutType = MarkOptional<CodeFieldClient, 'type'>
 
 type CodeFieldBaseClientProps = {
   readonly autoComplete?: string
+  readonly onMount?: EditorProps['onMount']
   readonly path: string
   readonly validate?: CodeFieldValidation
 }

packages/ui/src/fields/Code/index.tsx

@@ -30,6 +30,7 @@ const CodeFieldComponent: CodeFieldClientComponent = (props) => {
       localized,
       required,
     },
+    onMount,
     path,
     readOnly,
     validate,
@@ -84,6 +85,7 @@ const CodeFieldComponent: CodeFieldClientComponent = (props) => {
         <CodeEditor
           defaultLanguage={prismToMonacoLanguageMap[language] || language}
           onChange={readOnly ? () => null : (val) => setValue(val)}
+          onMount={onMount}
           options={editorOptions}
           readOnly={readOnly}
           value={(value as string) || ''}

test/lexical-mdx/collections/Posts/CodeFields.tsx

@@ -1,6 +1,6 @@
 'use client'
 
-import type { CodeFieldClientProps } from 'payload'
+import type { CodeFieldClient, CodeFieldClientProps } from 'payload'
 
 import { CodeField, useFormFields } from '@payloadcms/ui'
 import React, { useMemo } from 'react'
@@ -13,7 +13,17 @@ const languageKeyToMonacoLanguageMap = {
   tsx: 'typescript',
 }
 
-export const Code: React.FC<CodeFieldClientProps> = ({ field }) => {
+export const Code: React.FC<CodeFieldClientProps> = ({
+  autoComplete,
+  field,
+  forceRender,
+  path,
+  permissions,
+  readOnly,
+  renderedBlocks,
+  schemaPath,
+  validate,
+}) => {
   const languageField = useFormFields(([fields]) => fields['language'])
 
   const language: string =
@@ -21,13 +31,39 @@ export const Code: React.FC<CodeFieldClientProps> = ({ field }) => {
 
   const label = languages[language as keyof typeof languages]
 
-  const props: typeof field = useMemo(
+  const props: CodeFieldClient = useMemo<CodeFieldClient>(
     () => ({
       ...field,
+      type: 'code',
       admin: {
         ...field.admin,
-        components: field.admin?.components || {},
-        editorOptions: field.admin?.editorOptions || {},
+        description: 'test',
+        editorOptions: {
+          onMount: (editor, monaco) => {
+            // Set module resolution to NodeNext to enable autocompletion
+            monaco.languages.typescript.typescriptDefaults.setCompilerOptions({
+              allowNonTsExtensions: true,
+              module: monaco.languages.typescript.ModuleKind.ESNext,
+              moduleResolution: monaco.languages.typescript.ModuleResolutionKind.NodeJs,
+              target: monaco.languages.typescript.ScriptTarget.ESNext,
+              typeRoots: ['node_modules/@types'],
+            })
+
+            monaco.languages.typescript.typescriptDefaults.setDiagnosticsOptions({
+              noSemanticValidation: false,
+              noSyntaxValidation: false,
+            })
+
+            const libUri = 'node_modules/@types/payload/index.d.ts'
+
+            const run = async () => {
+              const types = await fetch('https://unpkg.com/payload@latest/dist/index.d.ts')
+              const libSource = await types.text()
+              monaco.languages.typescript.typescriptDefaults.addExtraLib(libSource, libUri)
+            }
+            void run()
+          },
+        } as any,
         label,
         language: languageKeyToMonacoLanguageMap[language] || language,
       },
@@ -37,5 +73,42 @@ export const Code: React.FC<CodeFieldClientProps> = ({ field }) => {
 
   const key = `${field.name}-${language}-${label}`
 
-  return <CodeField field={props} key={key} />
+  return (
+    props && (
+      <CodeField
+        autoComplete={autoComplete}
+        field={props}
+        forceRender={forceRender}
+        key={key}
+        onMount={(editor, monaco) => {
+          console.log('editor mounted')
+          // Set module resolution to NodeNext to enable autocompletion
+          monaco.languages.typescript.typescriptDefaults.setCompilerOptions({
+            allowNonTsExtensions: true,
+            moduleResolution: monaco.languages.typescript.ModuleResolutionKind.NodeJs,
+            paths: {
+              payload: ['file:///node_modules/payload/index.d.ts'],
+            },
+            target: monaco.languages.typescript.ScriptTarget.ESNext,
+            typeRoots: ['node_modules/@types', 'node_modules/payload'],
+          })
+          const run = async () => {
+            const types = await fetch('https://unpkg.com/payload@latest/dist/index.d.ts')
+            const typesText = await types.text()
+            monaco.languages.typescript.typescriptDefaults.addExtraLib(
+              typesText,
+              'file:///node_modules/payload/index.d.ts',
+            )
+          }
+          void run()
+        }}
+        path={path}
+        permissions={permissions}
+        readOnly={readOnly}
+        renderedBlocks={renderedBlocks}
+        schemaPath={schemaPath}
+        validate={validate}
+      />
+    )
+  )
 }