ExprEval

Category	Expression
Dependencies	expr-eval-fork
Bundle size	2.84 kB (10.50 kB with 3rd party deps)

Expression evaluator used by Vueform for conditions and computed values.

Installation

npm

npm install @vueform/expr-eval

pnpm

pnpm add @vueform/expr-eval

yarn

yarn add @vueform/expr-eval

bun

bun add @vueform/expr-eval

import { createVueform } from '@vueform/ui'
import exprEval from '@vueform/expr-eval'

createVueform({
  plugins: [exprEval()], 
})

Usage

Registering the plugin replaces the default expression engine with a full evaluator. Bare path interpolation like {name} works without any plugin — everything beyond it, operators, comparisons, ternaries, and function calls, needs this engine:

import { defineSchema } from '@vueform/ui'

const schema = defineSchema({
  price: { type: 'text', label: 'Price', default: 100 },
  quantity: { type: 'text', label: 'Quantity', default: 3 },
  total: {
    type: 'text',
    label: 'Total',
    default: '{price * quantity}', 
  },
})

The expression language and everything built on it — syntax and operators, built-in and custom functions, computed values, wildcards in lists, conditions, constants, escaping — is documented in the Expressions guide, and the $expression options in the Configuration chapter.

Source

packages/expr-eval