fix: no formality for certain languages

"EN" (English), "EN-GB" (British English), "EN-US" (American English), "ES" (Spanish), "JA" (Japanese) and "ZH" (Chinese) are unsupported.

Author: geekdada

README.md

@@ -12,6 +12,10 @@
 2. 下载插件 [releases](https://github.com/geekdada/bob-plugin-deepl-translate/releases)
 3. [安装插件](https://ripperhe.gitee.io/bob/#/general/quickstart/plugin?id=%e5%ae%89%e8%a3%85%e6%8f%92%e4%bb%b6)
 
+## 配置
+
+- `formality` 正式程度： 设置翻译后的文本是倾向于正式语言还是非正式语言。此功能目前适用于所有目标语言，除了英语、英式英语、美式英语、西班牙语、汉语和日语。
+
 ## Sub DeepL
 
 每个月最少 2.5 美元即可使用 DeepL API，详情请见 [sub-deepl.royli.dev](https://sub-deepl.royli.dev?utm_source=github&utm_medium=readme)。

src/main.ts

@@ -29,6 +29,9 @@ export function translate(
       throw err
     }
 
+    const formality = isFormalitySupported(targetLanguage)
+      ? $option.formality
+      : 'default'
     const response = await api.request<{
       translations: ReadonlyArray<{
         detected_source_language: string
@@ -42,7 +45,7 @@ export function translate(
         target_lang: targetLanguage,
         split_sentences: '1',
         preserve_formatting: '0',
-        formality: $option.formality,
+        formality,
       },
     })
 
@@ -95,3 +98,9 @@ export function translate(
     })
   })
 }
+
+function isFormalitySupported(lang: string): boolean {
+  const unsupported = ['EN', 'EN-GB', 'EN-US', 'ES', 'JA', 'ZH']
+
+  return !unsupported.includes(lang.toUpperCase())
+}