# wxml/no-const-and-let-in-wxs

# Background

let and const

let and const not work in wxs (opens new window)

Concepts In WXS, all variables reference values.

Undeclared variables that use directly assigned values are defined as global variables.
If you declare a variable but do not assign a value, its default value is undefined.
The var performance is consistent with JavaScript and variable hoisting is performed.

Wechat Document Reference (opens new window)

# Motivation

This rule hint wechat miniprogram developer don't using let and const in wxs.

<!-- ✓ GOOD -->
<wxs module="util" >
  var s = 100;
  module.exports = {
    data: s
  }
</wxs>

<!-- ✗ BAD -->
<wxs module="util" >
  let s = 100;

  const k = {};

  module.exports = {
    data: s,
    obj: k
  }
</wxs>

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# Config

No special options, normal config is ok

{ "wxml/no-const-and-let-in-wxs": "error" }

# Version

This rule was introduced in eslint-plugin-wxml v0.2.1

# Implementation

← wxml/max-lines wxml/no-dot-this-in-wx-key →