[ts] add rule to test if translation value is longer than original st…

…ring

packages/validator/source/rules/value-is-longer-than-default.ts

@@ -0,0 +1,48 @@
+import { type LifeCycleHooks, type OnTranslationsHook, type Rule } from '~/rules/utils/types.js'
+
+const type = 'notice'
+const MESSAGE_ID = 'value-is-longer-than-default'
+const messages = {
+  [MESSAGE_ID]: 'Translated string is longer than original string.'
+}
+
+// eslint-disable-next-line jsdoc/require-jsdoc
+const create = (): LifeCycleHooks => {
+  // eslint-disable-next-line jsdoc/require-jsdoc
+  const onTranslations: OnTranslationsHook = ({ report, filePath, key, translations }) => {
+    const ORIGINAL_LANG = 'en'
+    const originalString = translations[ORIGINAL_LANG]
+
+    if (originalString !== undefined) {
+      const longTranslations = Object.entries(translations).filter((t) => t[1].length > originalString.length)
+
+      if (longTranslations.length > 0) {
+        longTranslations.forEach((t) => {
+          report({
+            filePath,
+            key,
+            type,
+            value: t[1],
+            messageId: MESSAGE_ID,
+            message: `Translated string is longer in locale ${t[0]}`
+          })
+        })
+      }
+    }
+  }
+
+  return {
+    onTranslations
+  }
+}
+
+export const rule: Rule = {
+  create,
+  meta: {
+    type,
+    messages,
+    docs: {
+      description: 'Notify if translation string is longer than original string.'
+    }
+  }
+}