envify-codemod.js

// See https://github.com/facebook/jscodeshift for instructions on how to use codemods
module.exports = function ({path, source}, {jscodeshift: shift}, opts) {
  return shift(source)
  .find(shift.MemberExpression, {
    object: {
      object: {
        type: 'Identifier',
        name: 'process'
      },
      property: {
        type: 'Identifier',
        name: 'env'
      }
    }
  })
  .replaceWith(p => {
    const name = p.value.property.name;
    const value = process.env[name];
    return shift.literal(value);
  })
  .toSource();
};