feat(lib): adjust t with a custom bind

src/lib/index.ts

@@ -1,13 +1,7 @@
-import { translateImpl, defineT } from './utils'
+import { state, getCurrentState, translateImpl, defineT } from './utils'
 import { I18nState, SetI18n, Translate, WithI18n } from './type'
 export { Langs, I18nState, SetI18n, Translate, WithI18n, Config } from './type'
 
-let state = {} as I18nState
-
-function getCurrentState(namespace: string) {
-  return state[namespace] || {}
-}
-
 /**
  * Sets or updates the internationalization state
  * @param namespace Current namespace
@@ -53,10 +47,7 @@ function setI18n(namespace: string, stateProp: Parameters<SetI18n>[0]) {
     ...newState,
   }
 
-  state = {
-    ...state,
-    [namespace]: newCurrentState,
-  }
+  state[namespace] = newCurrentState
 
   return newCurrentState
 }
@@ -90,7 +81,7 @@ function withI18n(namespace: string, locale: string): { t: Translate } {
     locale,
   }
   return {
-    t: defineT(translateImpl.bind(null, state, null), state),
+    t: defineT(translateImpl.bind(null, state, null), false, namespace, locale),
   }
 }
 
@@ -118,19 +109,13 @@ export function initI18n(stateProp: I18nState) {
     delete stateProp.beginIndex
   }
 
-  state = {
-    ...state,
-    [namespace]: {
-      ...(stateProp || {}),
-    },
+  state[namespace] = {
+    ...(stateProp || {}),
   }
 
   return {
     setI18n: setI18n.bind(null, namespace) as SetI18n,
-    t: defineT(
-      translate.bind(null, namespace, null),
-      getCurrentState(namespace),
-    ),
+    t: defineT(translate.bind(null, namespace, null), true, namespace),
     withI18n: withI18n.bind(null, namespace) as WithI18n,
   }
 }

src/lib/utils.ts

@@ -6,6 +6,12 @@ import {
 } from './constants'
 import { I18nState, Translate } from './type'
 
+export const state = {}
+
+export function getCurrentState(namespace: string) {
+  return state[namespace] || {}
+}
+
 /**
  * 获取目标正则
  * @param regExp 基础正则
@@ -19,13 +25,36 @@ export function getTargetRegExp(regExp: RegExp, index: number) {
   )
 }
 
-export function defineT(t: Translate, state: I18nState): Translate {
+export function defineT(
+  t: Translate,
+  defineBind: boolean,
+  namespace: string,
+  locale?: string,
+): Translate {
   Object.defineProperty(t, 't', {
     get() {
-      return translateImpl.bind(null, state)
+      const state = getCurrentState(namespace)
+      return translateImpl.bind(
+        null,
+        typeof locale === 'string' ? { ...state, locale } : state,
+      )
     },
   })
 
+  if (defineBind) {
+    Object.defineProperty(t, 'bind', {
+      get() {
+        return () => {
+          const state = getCurrentState(namespace)
+          const newT = (...args) =>
+            translateImpl.bind(null, state, null, ...args)
+          defineT(newT as Translate, false, namespace)
+          return newT
+        }
+      },
+    })
+  }
+
   return t
 }
 
@@ -68,7 +97,7 @@ export function getTextFromFormatter(props: {
     const content = formatter({
       locale,
       payload: arg,
-      t: defineT(translateImpl.bind(null, state, null), state),
+      t: defineT(translateImpl.bind(null, state, null), false, state.namespace),
       ...(() => {
         let res = {}
         if (type === 'plural') {