build-abi.js

const path = require('path')
const fs = require('fs')
const contractBuildDir = path.join(path.dirname(require.main.filename), '../build/contracts')
const abiDir = path.join(path.dirname(require.main.filename), '../abi')

fs.readdir(contractBuildDir, (err, files) => {
  if (err) {
    console.error('whoops', err)
    process.exit()
  }

  files.forEach(filename => {
    const abiFilePath = path.join(abiDir, filename)
    console.log('creating ', abiFilePath, '...')

    const contents = fs.readFileSync(path.join(contractBuildDir, filename), 'utf8')
    const data = JSON.parse(contents)

    const abi = {
      'contractName': data['contractName'],
      'abi': data['abi'],
      'networks': data['networks'],
      'updatedAt': data['updatedAt']
    }

    const abiFileData = JSON.stringify(abi)
    fs.writeFileSync(abiFilePath, abiFileData)
  })

})