vue-function-api
v3.0.0-beta.0
Published
Provide logic composition capabilities for Vue.
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453
Readme
Vue Function API
vue-function-api
provides a way to use Vue3's Composition api in Vue2.x
.
Navigation
Installation
npm
npm install vue-function-api --save
yarn
yarn add vue-function-api
CDN
<script src="https://unpkg.com/vue-function-api/dist/vue-function-api.umd.js"></script>
By using the global variable window.vueFunctionApi
Usage
You must explicitly install vue-function-api
via Vue.use()
:
import Vue from 'vue';
import VueFunctionApi from 'vue-function-api';
Vue.use(VueFunctionApi);
After installing the plugin you can use the Composition API to compose your component.
TypeScript
To let TypeScript properly infer types inside Vue component options, you need to define components with createComponent
:
import Vue from 'vue';
const Component = createComponent({
// type inference enabled
});
const Component = {
// this will NOT have type inference,
// because TypeScript can't tell this is options for a Vue component.
};
Limitations
Ref
Unwrap
Unwrap
is not working with Array index.
Should not store ref
as a direct child of Array
:
const state = reactive({
list: [ref(0)],
});
// no unwrap, `.value` is required
state.list[0].value === 0; // true
state.list.push(ref(1);
// no unwrap, `.value` is required
state.list[1].value === 1; // true
Should not use ref
in a plain object when working with Array
:
const a = {
count: ref(0),
};
const b = reactive({
list: [a], // a.count will not unwrap!!
});
// no unwrap for `count`, `.value` is required
b.list[0].count.value === 0; // true
const b = reactive({
list: [
{
count: ref(0), // no unwrap!!
},
],
});
// no unwrap for `count`, `.value` is required
b.list[0].count.value === 0; // true
Should always use ref
in a reactive
when working with Array
:
const a = reactive({
count: ref(0),
});
const b = reactive({
list: [a],
});
// unwrapped
b.list[0].count === 0; // true
b.list.push(
reactive({
count: ref(1),
})
);
// unwrapped
b.list[1].count === 1; // true
watch()
API
onTrack
and onTrigger
are not available in WatchOptions
.
Template Refs
✅ Support ❌ Not Support
✅ String ref && return it from setup()
:
<template>
<div ref="root"></div>
</template>
<script>
export default {
setup() {
const root = ref(null);
onMounted(() => {
// the DOM element will be assigned to the ref after initial render
console.log(root.value); // <div/>
});
return {
root,
};
},
};
</script>
✅ String ref && return it from setup()
&& Render Function / JSX:
export default {
setup() {
const root = ref(null);
onMounted(() => {
// the DOM element will be assigned to the ref after initial render
console.log(root.value); // <div/>
});
return {
root,
};
},
render() {
// with JSX
return () => <div ref="root" />;
},
};
❌ Function ref:
<template>
<div :ref="el => root = el"></div>
</template>
<script>
export default {
setup() {
const root = ref(null);
return {
root,
};
},
};
</script>
❌ Render Function / JSX in setup()
:
export default {
setup() {
const root = ref(null);
return () =>
h('div', {
ref: root,
});
// with JSX
return () => <div ref={root} />;
},
};
If you really want to use template refs in this case, you can access vm.$refs
via SetupContext.refs
.
⚠️Warning: The
SetupContext.refs
won't existed inVue3.0
.Vue-function-api
provide it as a workaround here.
export default {
setup(initProps, setupContext) {
const refs = setupContext.refs;
onMounted(() => {
// the DOM element will be assigned to the ref after initial render
console.log(refs.root); // <div/>
});
return () =>
h('div', {
ref: 'root',
});
// with JSX
return () => <div ref="root" />;
},
};
You may also need to augment the SetupContext
when wokring with TypeScript:
import Vue from 'vue';
import VueFunctionApi from 'vue-function-api';
Vue.use(VueFunctionApi);
declare module 'vue-function-api/dist/component/component' {
interface SetupContext {
readonly refs: { [key: string]: Vue | Element | Vue[] | Element[] };
}
}