diff --git a/src/runtime/types/index.ts b/src/runtime/types/index.ts
index ad0aace..90dcdb4 100644
--- a/src/runtime/types/index.ts
+++ b/src/runtime/types/index.ts
@@ -14,9 +14,25 @@ export interface MessageObject {
   values?: Record<string, string | number | Date>
 }
 
-interface FormatterFn {
-  (id: string | MessageObject, options?: MessageObject): string
-}
+export type MessageFormatter = (
+  id: string | MessageObject,
+  options?: MessageObject
+) => string
+
+export type TimeFormatter = (
+  d: Date | number,
+  options?: IntlFormatterOptions<Intl.DateTimeFormatOptions>
+) => string
+
+export type DateFormatter = (
+  d: Date | number,
+  options?: IntlFormatterOptions<Intl.DateTimeFormatOptions>
+) => string
+
+export type NumberFormatter = (
+  d: number,
+  options?: IntlFormatterOptions<Intl.NumberFormatOptions>
+) => string
 
 type IntlFormatterOptions<T> = T & {
   format?: string
@@ -27,25 +43,6 @@ export interface MemoizedIntlFormatter<T, U> {
   (options?: IntlFormatterOptions<U>): T
 }
 
-export interface Formatter extends FormatterFn {
-  time: (
-    d: Date | number,
-    options?: IntlFormatterOptions<Intl.DateTimeFormatOptions>
-  ) => string
-  date: (
-    d: Date | number,
-    options?: IntlFormatterOptions<Intl.DateTimeFormatOptions>
-  ) => string
-  number: (
-    d: number,
-    options?: IntlFormatterOptions<Intl.NumberFormatOptions>
-  ) => string
-  capital: FormatterFn
-  title: FormatterFn
-  upper: FormatterFn
-  lower: FormatterFn
-}
-
 export interface MessagesLoader {
   (): Promise<any>
 }