Vue codemods

This repository contains a collection of codemod scripts for use with JSCodeshift that help update and refactor Vue and JavaScript files.

How to use:

$ npm install vue-codemods
$ cd vue-codemods
$ node ./transformers/sort_keys/sortKeys.js --path <folder with vue files>

Transformers:

• Sort keys: Sort object keys sorts Vue API properties according to Vue's styleguide.
• Uppercase constants renamer: Renames all constant declarations and optionaly DRY them.
• Extract non instance methods: Finds methods in the Vue object and removes the ones that do not depend on this, declaring them instead as functions outside the Vue object.

Transformers explanation:

Sort keys:

Sort object keys sorts Vue API properties according to Vue's styleguide.
This transformer does:

• sort Vue API properties alphabetically
• sort keys inside each of the vue API properties

Example:

$ node transformers/sort_keys/sortKeys.js --path <folder with vue or js files>

Before the transform:

  computed: {
    ...mapGettersB(),
    computedB() {
      return 'B';
    },
    computedA() {
      return 'A';
    },
    ...mapGettersA(),
  },
  props: {
    b: ['bar'],
    c: ['baz'],
    a: ['foo'],
  },

After the transform:

  computed: {
    ...mapGettersB(),
    ...mapGettersA(),

    computedA() {
      return 'A';
    },

    computedB() {
      return 'B';
    }
  },
  props: {
    a: ['foo'],
    b: ['bar'],
    c: ['baz'],
  },

You might want to run your ESLint after the transformer was applied, to keep your codestyle.

Uppercase constants renamer:

Renames all constant declarations and optionaly DRY them. This transformer does:

• rename variable names of constant literals to UPPERCASE_SNAKE_CASE
• replaces duplicate strings with variable names (DRY) (optional)

The options are:

• which, can be all, multiple or global
  • all: rename all ocurrencies
  • multiple: rename only ocurrencies that show upp more than once (default)
  • global: rename only ocurrencies declared in the global space
• dry, can be true or false - to replace duplicate string declarations with variable names

Example:

$ node transformers/uppercase_constants/uppercaseConstants.js --path <folder with vue or js files>

Before the transform:

const myRepeatedString = 'Some string';
let dynamicString = 'Dynamic string';
function foo() {
  return myRepeatedString + '!' + 'Some string';
}

function bar() {
  let myRepeatedString = 'Some other string';
  return myRepeatedString + '...';
}

const myUniqueString = 'I only show up once...';

console.log(foo('Some string'), bar(), dynamicString, myRepeatedString);

After the transform, with options {which: 'all', dry: true}:

const MY_REPEATED_STRING = 'Some string';
let dynamicString = 'Dynamic string';
function foo() {
  return MY_REPEATED_STRING + '!' + MY_REPEATED_STRING;
}

function bar() {
  let MY_REPEATED_STRING = 'Some other string';
  return MY_REPEATED_STRING + '...';
}

const myUniqueString = 'I only show up once...';

console.log(foo(MY_REPEATED_STRING), bar(), dynamicString, MY_REPEATED_STRING);

Extract non instance methods:

Finds methods in the Vue object and removes the ones that do not depend on this, declaring them instead as functions outside the Vue object.

Note: this codemod takes into account the usage of methods in the template so it will not extract methods that are used in the template, which would break code.

Example:

$ node transformers/extract_non_instance_methods/extractNonInstanceMethods.js --path <folder with vue or js files>

Before the transform:

<template>
  <div :some-prop="noThisButUsedInTemplate1('foo')" @click="noThisButUsedInTemplate2">
    Some test template
  </div>
</template>
<script>
export default {
  name: 'Component',
  methods: {
    close() {
      if (this.isClosed) {
        return;
      }

      this.isOpen = false;
      this.$emit('close');
    },
    noThis() {
      return 'I should be extracted to the global space';
    },
    noThisButUsedInTemplate1() {
      return 'I should stay in the instance';
    },
    noThisButUsedInTemplate2() {
      return 'I should stay in the instance';
    },
  },
};
</script>

After the transform:

<template>
  <div :some-prop="noThisButUsedInTemplate1('foo')" @click="noThisButUsedInTemplate2">
    Some test template
  </div>
</template>
<script>
const noThis = function() {
  return 'I should be extracted to the global space';
};

export default {
  name: 'Component',
  methods: {
    close() {
      if (this.isClosed) {
        return;
      }

      this.isOpen = false;
      this.$emit('close');
    },

    noThisButUsedInTemplate1() {
      return 'I should stay in the instance';
    },

    noThisButUsedInTemplate2() {
      return 'I should stay in the instance';
    }
  },
};
</script>