Usage no npm install needed!

<script type="module">
  import vueRefTransform from 'https://cdn.skypack.dev/@vue/ref-transform';



⚠️ This is experimental and currently only provided for testing and feedback. It may break during patches or even be removed. Use at your own risk!

Follow https://github.com/vuejs/rfcs/discussions/369 for details and updates.

Basic Rules

  • $() to turn refs into reactive variables
  • $() to access the original refs from reactive variables
import { ref, watch } from 'vue'

// bind ref as a variable
let count = $(ref(0))

// no need for .value

// get the actual ref
watch($(count), c => console.log(`count changed to ${c}`))

// assignments are reactive


A few commonly used APIs have shorthands (which also removes the need to import them):

  • $(ref(0)) -> $ref(0)
  • $(computed(() => 123)) -> $computed(() => 123)
  • $(shallowRef({})) -> $shallowRef({})


This package is the lower-level transform that can be used standalone. Higher-level tooling (e.g. @vitejs/plugin-vue and vue-loader) will provide integration via options.


Can be used to do a cheap check to determine whether full transform should be performed.

import { shouldTransform } from '@vue/ref-transform'

shouldTransform(`let a = ref(0)`) // false
shouldTransform(`let a = $ref(0)`) // true


import { transform } from '@vue/ref-transform'

const src = `let a = $ref(0); a++`
const {
  code, // import { ref as _ref } from 'vue'; let a = (ref(0)); a.value++"
} = transform(src, {
  filename: 'foo.ts',
  sourceMap: true,

  // @babel/parser plugins to enable.
  // 'typescript' and 'jsx' will be auto-inferred from filename if provided,
  // so in most cases explicit parserPlugins are not necessary
  parserPlugins: [
    /* ... */


interface RefTransformOptions {
  filename?: string
  sourceMap?: boolean // default: false
  parserPlugins?: ParserPlugin[]
  importHelpersFrom?: string // default: "vue"


Transform with an existing Babel AST + MagicString instance. This is used internally by @vue/compiler-sfc to avoid double parse/transform cost.

import { transformAST } from '@vue/ref-transform'
import { parse } from '@babel/parser'
import MagicString from 'magic-string'

const src = `let a = $ref(0); a++`
const ast = parse(src, { sourceType: 'module' })
const s = new MagicString(src)

const {
  rootRefs, // ['a']
  importedHelpers // ['ref']
} = transformAST(ast, s)

console.log(s.toString()) // let a = _ref(0); a.value++