Currently when the build fails (e.g. due to a missing named export), the message is pretty ugly:

<img width="1033" alt="screen shot 2017-11-04 at 13 12 31" src="https://user-images.githubusercontent.com/810438/32405680-d618d2e6-c161-11e7-9b91-e0241c7c3eed.png">

It would be nice to display the relevant line inline with syntax highlighting, sort of like Babel does it. Maybe Babel's `babel-code-frame` could be helpful (not sure).

To reproduce, fail the build by removing some `export` somewhere and run `yarn build`. (Tip: `yarn build core --type=NODE_DEV` is the fastest way to build just `packages/react/*` and that might be enough to reproduce and iterate on the error message.)

The relevant logic for displaying build errors is probably somewhere in `scripts/rollup/build.js`.

**If you'd like to work on this please comment here, so we don't have many people working on the same thing.**
'use strict';
const rollup = require('rollup').rollup;
const babel = require('rollup-plugin-babel');
const closure = require('rollup-plugin-closure-compiler-js');
const commonjs = require('rollup-plugin-commonjs');
const alias = require('rollup-plugin-alias');
const prettier = require('rollup-plugin-prettier');
const replace = require('rollup-plugin-replace');
const stripBanner = require('rollup-plugin-strip-banner');
const chalk = require('chalk');
const join = require('path').join;
const resolve = require('path').resolve;
const resolvePlugin = require('rollup-plugin-node-resolve');
const fs = require('fs');
const rimraf = require('rimraf');
const argv = require('minimist')(process.argv.slice(2));
const Modules = require('./modules');
const Bundles = require('./bundles');
const sizes = require('./plugins/sizes-plugin');
const Stats = require('./stats');
const extractErrorCodes = require('../error-codes/extract-errors');
const syncReactDom = require('./sync').syncReactDom;
const syncReactNative = require('./sync').syncReactNative;
const syncReactNativeRT = require('./sync').syncReactNativeRT;
const syncReactNativeCS = require('./sync').syncReactNativeCS;
const Packaging = require('./packaging');
const Wrappers = require('./wrappers');
const UMD_DEV = Bundles.bundleTypes.UMD_DEV;