Messagevisor

Vue

@messagevisor/vue provides Vue 3 bindings for the JavaScript SDK: a plugin, provider component, Composition API composables, rich text components, and template globals.

Install

Command
$ npm install @messagevisor/sdk @messagevisor/vue @messagevisor/module-icu

Plugin setup

Create a Messagevisor SDK instance and install the Vue plugin:

src/main.ts
import { createApp, h } from "vue";
import { createMessagevisor } from "@messagevisor/sdk";
import { createICUModule } from "@messagevisor/module-icu";
import { createMessagevisorProvider } from "@messagevisor/vue";
import App from "./App.vue";
import datafile from "./datafiles/messagevisor-web-en-US.json";
const m = createMessagevisor({
  datafile,
  modules: [createICUModule({ ignoreTags: false })],
});
createApp(App)
  .use(
    createMessagevisorProvider({
      instance: m,
      defaultRichTextElements: {
        strong: (chunks) => h("strong", chunks),
        link: (chunks) => h("a", { href: "/terms" }, chunks),
      },
    }),
  )
  .mount("#app");

The plugin provides the instance to Composition API helpers and installs three template globals:

  • $messagevisor: full Vue Messagevisor API
  • $m: short alias for $messagevisor
  • $t: translation function
<template>
  <h1>{{ $t("dashboard.welcome", { name: "Ada" }) }}</h1>
  <p>{{ $m.formatNumber(12, { style: "currency", currency: "EUR" }) }}</p>
</template>

Composables

Use useMessagevisor() when you want imperative SDK-style methods:

<script setup lang="ts">
import { useMessagevisor } from "@messagevisor/vue";
const { t, translate, formatNumber, setLocale } = useMessagevisor();
</script>
<template>
  <button @click="setLocale('nl-NL')">Nederlands</button>
  <h1>{{ t("dashboard.welcome", { name: "Ada" }) }}</h1>
  <p>{{ translate("billing.total", { amount: 12 }) }}</p>
  <p>{{ formatNumber(12, { style: "currency", currency: "EUR" }) }}</p>
</template>

Use value-oriented composables when the component should update after SDK state changes. They return ComputedRefs, which Vue unwraps in templates:

<script setup lang="ts">
import { ref } from "vue";
import { useLocale, useTranslation, useFormatNumber } from "@messagevisor/vue";
const name = ref("Ada");
const locale = useLocale();
const title = useTranslation("dashboard.welcome", { name });
const total = useFormatNumber(12, { style: "currency", currency: "EUR" });
</script>
<template>
  <main :lang="locale || undefined">
    <h1>{{ title }}</h1>
    <p>{{ total }}</p>
  </main>
</template>

In script code, access computed values with .value.

Reactive inputs

Reactive composables accept plain values, refs, computed refs, or getter functions:

const key = computed(() => "dashboard.welcome");
const name = ref("Ada");
const plan = ref("pro");
const title = useTranslation(
  key,
  { name },
  () => ({ context: { plan: plan.value } }),
);

Values and options records are shallow-unwrapped, so refs inside a values object work without extra computed wrappers.

Rich text components

Use MessageTranslation for keyed translations and FormatMessage for raw message strings:

<script setup lang="ts">
import { MessageTranslation } from "@messagevisor/vue";
</script>
<template>
  <MessageTranslation
    message-key="legal.terms"
    tag="p"
    :values="{ product: 'Messagevisor' }"
  >
    <template #link="{ chunks }">
      <a href="/terms">{{ chunks }}</a>
    </template>
    <template #strong="{ chunks }">
      <strong>{{ chunks }}</strong>
    </template>
  </MessageTranslation>
</template>

Named slots map to rich text tags in the selected ICU message. Local slots win over defaultRichTextElements from the plugin or provider.

MessageTranslation and FormatMessage render without a wrapper by default. Pass tag when you need a concrete root element for classes, attributes, or layout.

Provider override

Use MessagevisorProvider when a subtree needs a different instance or rich text defaults than the app plugin:

<script setup lang="ts">
import { MessagevisorProvider } from "@messagevisor/vue";
</script>
<template>
  <MessagevisorProvider :instance="previewMessagevisor">
    <PreviewPanel />
  </MessagevisorProvider>
</template>

This is useful for previews, embedded admin tools, or tests.

Available exports

  • createMessagevisorProvider()
  • MessagevisorProvider
  • MessageTranslation
  • FormatMessage
  • useMessagevisor()
  • useSdk()
  • useMessagevisorSnapshot()
  • useLocale()
  • useDirection()
  • useLocaleInfo()
  • useMessagevisorContext()
  • useCurrency()
  • useTimeZone()
  • useTranslation()
  • useFormatMessage()
  • useFormatNumber()
  • useFormatDate()
  • useFormatTime()
  • useFormatDateTimeRange()
  • useFormatRelativeTime()
  • useFormatPlural()
  • useFormatList()
  • useFormatDisplayName()