Crash the app if it does not find index.html or index.js (facebook#653)

Author: vnctaing

config/paths.js

@@ -39,6 +39,7 @@ var nodePaths = (process.env.NODE_PATH || '')
 module.exports = {
  appBuild: resolveApp('build'),
  appHtml: resolveApp('index.html'),
+ appIndexJs: resolveApp('src/index.js'),
  appPackageJson: resolveApp('package.json'),
  appSrc: resolveApp('src'),
  testsSetup: resolveApp('src/setupTests.js'),
@@ -56,6 +57,7 @@ function resolveOwn(relativePath) {
 module.exports = {
  appBuild: resolveApp('build'),
  appHtml: resolveApp('index.html'),
+ appIndexJs: resolveApp('src/index.js'),
  appPackageJson: resolveApp('package.json'),
  appSrc: resolveApp('src'),
  testsSetup: resolveApp('src/setupTests.js'),
@@ -70,6 +72,7 @@ module.exports = {
 module.exports = {
  appBuild: resolveOwn('../build'),
  appHtml: resolveOwn('../template/index.html'),
+ appIndexJs: resolveOwn('../template/src/index.js'),
  appPackageJson: resolveOwn('../package.json'),
  appSrc: resolveOwn('../template/src'),
  testsSetup: resolveOwn('../template/src/setupTests.js'),

config/webpack.config.dev.js

@@ -49,7 +49,7 @@ module.exports = {
  // We ship a few polyfills by default.
  require.resolve('./polyfills'),
  // Finally, this is your app's code:
- path.join(paths.appSrc, 'index')
+ paths.appIndexJs
  // We include the app code last so that if there is a runtime error during
  // initialization, it doesn't blow up the WebpackDevServer client, and
  // changing JS code would still trigger a refresh.

config/webpack.config.prod.js

@@ -48,7 +48,7 @@ module.exports = {
  // In production, we only want to load the polyfills and the app code.
  entry: [
  require.resolve('./polyfills'),
- path.join(paths.appSrc, 'index')
+ paths.appIndexJs
  ],
  output: {
  // The build folder.

scripts/start.js

@@ -11,6 +11,7 @@
 
 process.env.NODE_ENV = 'development';
 
+var fs = require('fs');
 var path = require('path');
 var chalk = require('chalk');
 var webpack = require('webpack');
@@ -170,6 +171,20 @@ function openBrowser(port, protocol) {
  opn(protocol + '://localhost:' + port + '/');
 }
 
+function checkRequiredFiles() {
+ var filesPathToCheck = [paths.appHtml, paths.appIndexJs];
+ filesPathToCheck.forEach(function(filePath) {
+ try {
+ fs.accessSync(filePath, fs.F_OK);
+ } catch (err) {
+ var fileName = path.basename(filePath);
+ console.log(
+ chalk.red(`Cannot find ${fileName} in ${filePath} directory`)
+ );
+ process.exit(1);
+ }
+ });
+}
 // We need to provide a custom onError function for httpProxyMiddleware.
 // It allows us to log custom error messages on the console.
 function onProxyError(proxy) {
@@ -180,7 +195,7 @@ function onProxyError(proxy) {
  ' from ' + chalk.cyan(host) + ' to ' + chalk.cyan(proxy) + '.'
  );
  console.log(
- 'See https://nodejs.org/api/errors.html#errors_common_system_errors for more information (' + 
+ 'See https://nodejs.org/api/errors.html#errors_common_system_errors for more information (' +
  chalk.cyan(err.code) + ').'
  );
  console.log();
@@ -190,7 +205,7 @@ function onProxyError(proxy) {
  if (res.writeHead && !res.headersSent) {
  res.writeHead(500);
  }
- res.end('Proxy error: Could not proxy request ' + req.url + ' from ' + 
+ res.end('Proxy error: Could not proxy request ' + req.url + ' from ' +
  host + ' to ' + proxy + ' (' + err.code + ').'
  );
  }
@@ -304,6 +319,7 @@ function runDevServer(port, protocol) {
 
 function run(port) {
  var protocol = process.env.HTTPS === 'true' ? "https" : "http";
+ checkRequiredFiles();
  setupCompiler(port, protocol);
  runDevServer(port, protocol);
 }