fix: create i18next clone to fix #1063 (#1073)

* create i18next clone to fix #1063

* added dedicated test for i18next clone

src/createClient/node.test.ts

@@ -7,14 +7,31 @@ const config = {
 } as any
 
 describe('createClientNode', () => {
+  const client = createClientNode(config)
   it('returns a node client', () => {
-    const client = createClientNode(config)
     expect(typeof client.initPromise.then).toEqual('function')
     expect(typeof client.i18n.addResource).toEqual('function')
     expect(typeof (client.i18n as any).translator).toEqual('object')
     expect(
       (client.i18n.options as any).defaultLocale
     ).toEqual(config.defaultLocale)
     expect((client.i18n.options as any).locales).toEqual(config.locales)
+    expect((client.i18n.options as any).isClone).not.toEqual(true)
+  })
+
+  describe('createClientNode a second time should return a clone of i18next', () => {
+    it('returns a node client', () => {
+      const secondClient = createClientNode(config)
+      expect(typeof secondClient.initPromise.then).toEqual('function')
+      expect(typeof secondClient.i18n.addResource).toEqual('function')
+      expect(typeof (secondClient.i18n as any).translator).toEqual('object')
+      expect(
+        (secondClient.i18n.options as any).defaultLocale
+      ).toEqual(config.defaultLocale)
+      expect((secondClient.i18n.options as any).locales).toEqual(config.locales)
+      expect((secondClient.i18n.options as any).isClone).toEqual(true)
+      expect(secondClient).not.toEqual(client)
+      expect((secondClient as any).store).toEqual((client as any).store)
+    })
   })
 })

src/createClient/node.ts

@@ -8,6 +8,11 @@ let instance: I18n
 export default (config: InternalConfig): CreateClientReturn => {
   if (!instance) {
     instance = i18n.createInstance(config)
+  } else {
+    instance = instance.cloneInstance({
+      ...config,
+      initImmediate: false,
+    })
   }
   let initPromise: InitPromise