fix: Resolve the message in components which was rendered with slots, for about <i18n-t>, <i18n-n> and <i18n-d>

packages/vue-i18n-core/src/i18n.ts

@@ -1021,7 +1021,10 @@ function getComposer(
 ): Composer | null {
  let composer: Composer | null = null
  const root = target.root
- let current: ComponentInternalInstance | null = target.parent
+ let current: ComponentInternalInstance | null = getParentComponentInstance(
+ target,
+ useComponent
+ )
  while (current != null) {
  const i18nInternal = i18n as unknown as I18nInternal
  if (i18n.mode === 'composition') {
@@ -1053,6 +1056,23 @@ function getComposer(
  return composer
 }
 
+function getParentComponentInstance(
+ target: ComponentInternalInstance | null,
+ useComponent = false
+) {
+ if (target == null) {
+ return null
+ }
+ if (!__BRIDGE__) {
+ // if `useComponent: true` will be specified, we get lexical scope owner instance for use-case slots
+ return !useComponent
+ ? target.parent
+ : (target.vnode as any).ctx || target.parent // eslint-disable-line @typescript-eslint/no-explicit-any
+ } else {
+ return target.parent
+ }
+}
+
 function setupLifeCycle(
  i18n: I18nInternal,
  target: ComponentInternalInstance,

packages/vue-i18n-core/test/components/Translation.test.ts

@@ -189,7 +189,7 @@ test('scope', async () => {
 `
  })
 
- const Root = defineComponent({
+ const App = defineComponent({
  components: {
  Container
  },
@@ -208,7 +208,7 @@ test('scope', async () => {
  template: `<Container>`
  })
 
- const wrapper = await mount(Root, i18n)
+ const wrapper = await mount(App, i18n)
 
  expect(wrapper.html()).toEqual(`this is rootthis is global`)
 })

packages/vue-i18n-core/test/issues.test.ts

@@ -18,7 +18,8 @@ import {
  h,
  withDirectives,
  resolveDirective,
- nextTick
+ nextTick,
+ getCurrentInstance
 } from 'vue'
 import {
  setDevToolsHook,
@@ -32,6 +33,8 @@ import {
 import { createI18n, useI18n } from '../src/i18n'
 import { mount } from './helper'
 
+import type { ComponentOptions } from 'vue'
+
 const container = document.createElement('div')
 document.body.appendChild(container)
 
@@ -292,6 +295,92 @@ describe('issue #722', () => {
  })
 })
 
+test('issue #729', async () => {
+ const i18n = createI18n({
+ legacy: true,
+ locale: 'en',
+ messages
+ })
+
+ const C3 = defineComponent({
+ template: `<div>C3 slot: <slot></slot></div>`,
+ i18n: {
+ messages: {
+ en: {
+ hello: 'Hello {world} - C3',
+ world: 'world! - C3'
+ }
+ }
+ }
+ })
+
+ const C2 = defineComponent({
+ template: `<div>C2 slot: <slot></slot></div>`,
+ i18n: {
+ messages: {
+ en: {
+ goodbuy: 'Goodbuy!'
+ }
+ }
+ }
+ })
+
+ const C1 = defineComponent({
+ components: {
+ C2,
+ C3
+ },
+ template: `<div>
+ C1:
+ <div>{{ $t("hello", { world: $t("world") }) }}</div>
+ <i18n-t keypath="hello" tag="div">
+ <template #world>
+ <strong>{{ $t("world") }}</strong>
+ </template>
+ </i18n-t>
+
+ <br />
+
+ <C2>
+ <div>{{ $t("hello", { world: $t("world") }) }}</div>
+ <i18n-t keypath="hello" tag="div">
+ <template #world>
+ <strong>{{ $t("world") }}</strong>
+ </template>
+ </i18n-t>
+ </C2>
+ <C3>
+ <div>{{ $t("hello", { world: $t("world") }) }}</div>
+ <i18n-t keypath="hello" tag="div">
+ <template #world>
+ <strong>{{ $t("world") }}</strong>
+ </template>
+ </i18n-t>
+ </C3>
+ </div>`,
+ i18n: {
+ messages: {
+ en: {
+ hello: 'Hello {world}',
+ world: 'world!'
+ }
+ }
+ }
+ })
+
+ const App = defineComponent({
+ components: {
+ C1
+ },
+ template: `<C1 />`
+ })
+ const wrapper = await mount(App, i18n)
+
+ expect(wrapper.html()).toEqual(
+ `<div> C1: <div>Hello world!</div><div>Hello <strong>world!</strong></div><br><div>C2 slot: <div>Hello world!</div><div>Hello <strong>world!</strong></div></div><div>C3 slot: <div>Hello world!</div><div>Hello <strong>world!</strong></div></div></div>`
+ )
+})
+
 test('issue #819: v-for', async () => {
  const i18n = createI18n({
  legacy: false,
@@ -722,3 +811,71 @@ test('issue #1123', async () => {
  `hello, <span>Hello</span>! Do you like <a><strong>Vue </strong> I18n </a>?`
  )
 })
+
+test('issue #1392', async () => {
+ const i18n = createI18n({
+ legacy: false,
+ locale: 'en',
+ messages: {
+ en: { hello: 'world' }
+ }
+ })
+
+ const Test = defineComponent({
+ setup() {
+ const instance = getCurrentInstance()
+ if (instance == null) {
+ throw new Error()
+ }
+ // emulate i18n custom block
+ const options = instance.type as ComponentOptions
+ options.__i18n = [
+ {
+ locale: 'en',
+ resource: {
+ any: 'thing'
+ }
+ }
+ ]
+ const { t } = useI18n()
+ return { t }
+ },
+ template: `<slot />`
+ })
+
+ const App = defineComponent({
+ components: {
+ Test
+ },
+ setup() {
+ const instance = getCurrentInstance()
+ if (instance == null) {
+ throw new Error()
+ }
+ // emulate i18n custom block
+ const options = instance.type as ComponentOptions
+ options.__i18n = [
+ {
+ locale: 'en',
+ resource: {
+ doesNotWork: 'works'
+ }
+ }
+ ]
+ const { t } = useI18n()
+
+ return { t }
+ },
+ template: `<div>
+ <Test>
+ component: <i18n-t keypath="doesNotWork" />
+ <br />
+ t: {{ t('doesNotWork') }}
+ </Test>
+</div>`
+ })
+
+ const wrapper = await mount(App, i18n)
+
+ expect(wrapper.html()).toEqual(`<div> component: works<br> t: works</div>`)
+})