@prismicio/babel-transform-config/examples/transform.js

Transform JS config files (Next, Nuxt, Gatsby)

const fs = require('fs');
const path = require('path');
const transformCode = require('../').transform;

const code = fs.readFileSync(
  path.join(__dirname, 'configs', 'nuxt.trans.js'),
  'utf8'
);

const transforms = {
  'head:script': {
    // create or replace export default { head: { script: [] }}
    action: 'create:replace',
    value: ['my/script.js']
  },
  'delete:deleteMeMaybe': {
    // delete export default { deleteMe: ... }
    action: 'delete'
  },
  deleteMeMaybe: {
    // delete export default { deleteMe: ... }
    action: 'delete'
  },
  'build:transpile': {
    // merges export default { babel: { transpile: arrayOrObject } }
    action: 'merge:create',
    value: ['path/to/file']
  }
};

const { code: updated } = transformCode(code, transforms);

console.log('previous code:\n', code);

console.log('passed transform args: ', JSON.stringify(transforms), '\n');

console.log('new code:\n', updated);