# vue/valid-v-bind-sync

enforce valid .sync modifier on v-bind directives

  • ⚙️ This rule is included in all of "plugin:vue/essential", "plugin:vue/strongly-recommended" and "plugin:vue/recommended".

This rule checks whether every .sync modifier on v-bind directives is valid.

# 📖 Rule Details

This rule reports .sync modifier on v-bind directives in the following cases:

  • The .sync modifier does not have the attribute value which is valid as LHS. E.g. <MyComponent v-bind:aaa.sync="foo() + bar()" />, <MyComponent v-bind:aaa.sync="a?.b" />
  • The .sync modifier has potential null object property access. E.g. <MyComponent v-bind:aaa.sync="(a?.b).c" />
  • The .sync modifier is on non Vue-components. E.g. <input v-bind:aaa.sync="foo"></div>
  • The .sync modifier's reference is iteration variables. E.g. <div v-for="x in list"><MyComponent v-bind:aaa.sync="x" /></div>
<template> <!-- ✓ GOOD --> <MyComponent v-bind:aaa.sync="foo"/> <MyComponent :aaa.sync="foo"/> <div v-for="todo in todos"> <MyComponent v-bind:aaa.sync="todo.name"/> <MyComponent :aaa.sync="todo.name"/> </div> <!-- ✗ BAD --> <MyComponent v-bind:aaa.sync="foo + bar" /> <MyComponent :aaa.sync="foo + bar" /> <MyComponent :aaa.sync="a?.b.c" /> <MyComponent :aaa.sync="(a?.b).c" /> <input v-bind:aaa.sync="foo"> <input :aaa.sync="foo"> <div v-for="todo in todos"> <MyComponent v-bind:aaa.sync="todo" /> <MyComponent :aaa.sync="todo" /> </div> </template>
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This rule does not check syntax errors in directives because it's checked by vue/no-parsing-error rule.

# 🔧 Options


# 📚 Further Reading

# 🚀 Version

This rule was introduced in eslint-plugin-vue v7.0.0

# 🔍 Implementation