brad/jasonette-webpack-plugin

import axis from 'axis.js'
import uglify from 'uglify-js'
import vm from 'vm'


export default class JasonettePlugin {
  constructor(options) {
    this.options = Object.assign({
      'replacer': this.replacer,
      'space': '',
    }, options)
  }

  replacer(key, value) {
    if(axis.isFunction(value)) {
      const uglified = uglify.minify(`${String(value)}`, {fromString: true})
      const cleaned = uglified.code.replace('{{', '{ {').replace('}}', '} }')
      return `{{ ${cleaned};return ${value.name}() }}`
    } else if(axis.isObject(value) || axis.isArray(value)) {
      return value
    }
    return String(value)
  }

  apply(compiler) {
    const options = this.options

    compiler.plugin("emit", (compilation, callback) => {
      Object.keys(compilation.assets).forEach((asset) => {
        const compiled = vm.runInThisContext(compilation.assets[asset].source())
        Object.keys(compiled).forEach((json) => {
          const src = JSON.stringify(compiled[json], options.replacer, options.space)
          const filename = ['default', 'jasonette'].indexOf(json) > -1 ? asset : `${json}.json`
          compilation.assets[filename] = {
            source: () => src,
            size: () => src.length
          }
        })
      })
      callback()
    })
  }
}