feat: implement JSON converter (#51)

cli.js

@@ -27,7 +27,7 @@ const argv = yargs // eslint-disable-line
     alias: 'f',
     describe: 'Format to generate - sass,less,stylus',
     type: 'string',
-    choices: ['sass', 'scss', 'less', 'styl'],
+    choices: ['sass', 'scss', 'less', 'styl', 'json'],
     nargs: 1,
     demand: true
   })
@@ -57,7 +57,7 @@ const argv = yargs // eslint-disable-line
     describe: 'Keys to preserve',
     type: 'array', /* array | boolean | string */
     nargs: 1,
-    coerce: array => {
+    coerce: (array = []) => {
       return array.flatMap(v => v.split(','))
     }
   })

src/converters/JSON.js

@@ -0,0 +1,15 @@
+import Converter from './Converter'
+
+class JSONConverter extends Converter {
+  format = 'json'
+
+  convert () {
+    const filtered = Object.entries(this.theme).filter(([key]) => {
+      return this._isSettingEnabled(key)
+    })
+
+    return JSON.stringify(Object.fromEntries(filtered), null, 2)
+  }
+}
+
+export default JSONConverter

src/converters/index.js

@@ -2,7 +2,8 @@ import Less from './Less'
 import Stylus from './Stylus'
 import Sass from './Sass'
 import Scss from './Scss'
+import JSON from './JSON'
 
 export default {
-  Less, Sass, Scss, Stylus
+  Less, Sass, Scss, Stylus, JSON
 }

src/index.js

@@ -8,7 +8,8 @@ const allowedFormatsMap = {
   styl: converters.Stylus,
   sass: converters.Sass,
   scss: converters.Scss,
-  less: converters.Less
+  less: converters.Less,
+  json: converters.JSON
 }
 
 /**
@@ -42,7 +43,10 @@ class ConvertTo {
    * @returns {string}
    */
   convert () {
-    let buffer = `/* Converted Tailwind Config to ${this.options.format} */`
+    let buffer = ''
+    if (this.options.format !== 'json') {
+      buffer = `/* Converted Tailwind Config to ${this.options.format} */`
+    }
     buffer += this.converterInstance.convert()
     return buffer
   }

tests/specs/converters/JSON.spec.js

@@ -0,0 +1,14 @@
+import JSONConverter from '../../../src/converters/JSON'
+import { resolveConfig } from '../../../src/converters/utils'
+import testConfigDefault from '../../tailwind-default.config'
+
+describe('JSON converter', () => {
+  describe('full config', () => {
+    it('converts all props, to a JSON', () => {
+      const converter = new JSONConverter({
+        config: resolveConfig(testConfigDefault)
+      })
+      expect(converter.convert()).toMatchSnapshot()
+    })
+  })
+})