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Rule Proposal: vue/no-extra-whitespaces  #133

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@riophae

Description

@riophae

Please describe what the rule should do:

This rule warns about the usage of useless spaces.

What category of rule is this? (place an "X" next to just one item)

[x] Enforces code style
[ ] Warns about a potential error
[ ] Suggests an alternate way of doing something
[ ] Other (please specify:)

Provide 2-3 code examples that this rule will warn about:

<template>
  <div class="wrapper">
    <div class="example1" ></div>
    <div class="example2"  @click="handleClick">
      <!-- Notice there are two spaces between `class` and `@click` -->
    </div>
    <div class="example3 ">
      <!-- Is it possible to catch extra spaces in attribute value? -->
    </div>
  </div>
</template>

However, the following should be considered fine:

<template>
  <div class="wrapper">
    <self-closing />
    <div 
      class="multiple-line"
      @click="handleClick"
      >
    </div>
  </div>
</template>

The suggested rule name is likely not good enough.

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