knex/lib/util/finally-mixin.js

const noop = require('./noop');

const finallyMixin = (prototype) =>
  Object.assign(prototype, {
    finally(onFinally) {
      return this.then().finally(onFinally);
    },
  });

// FYI: Support for `Promise.prototype.finally` was not introduced until Node 9.
//      Therefore, Knex will need to conditionally inject support for `.finally(..)`
//      until support for Node 8 is officially dropped.
module.exports = Promise.prototype.finally ? finallyMixin : noop;