feat(prettier): add getPrettier option (#68)

packages/prettier/index.ts

@@ -1,4 +1,4 @@
-import type { ServicePluginInstance, ServicePlugin } from '@volar/language-service';
+import type { ServicePluginInstance, ServicePlugin, ServiceEnvironment } from '@volar/language-service';
 import type { Options, ResolveConfigOptions } from 'prettier';
 
 export function create(
@@ -42,6 +42,7 @@ export function create(
  * This property is useful whenever you want to load a specific instance of Prettier (for instance, loading the Prettier version installed in the user's project)
  */
  prettier?: typeof import('prettier') | undefined;
+ getPrettier?: (serviceEnv: ServiceEnvironment) => typeof import('prettier') | undefined,
  } = {},
  getPrettierConfig = async (filePath: string, prettier: typeof import('prettier'), config?: ResolveConfigOptions) => {
  return await prettier.resolveConfig(filePath, config) ?? {};
@@ -53,7 +54,9 @@ export function create(
 
  let prettier: typeof import('prettier');
  try {
- prettier = options.prettier ?? require('prettier');
+ prettier = options.prettier
+ ?? options.getPrettier?.(context.env)
+ ?? require('prettier');
  } catch (e) {
  throw new Error("Could not load Prettier: " + e);
  }