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start.js
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start.js
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'use strict';
// Do this as the first thing so that any code reading it knows the right env.
process.env.BABEL_ENV = 'development';
process.env.NODE_ENV = 'development';
// Makes the script crash on unhandled rejections instead of silently
// ignoring them. In the future, promise rejections that are not handled will
// terminate the Node.js process with a non-zero exit code.
process.on('unhandledRejection', err => {
throw err;
});
// Ensure environment variables are read.
require('../config/env');
const fs = require('fs');
const path = require('path');
const chalk = require('chalk');
const webpack = require('webpack');
const WebpackDevServer = require('webpack-dev-server');
const config = require('../config/webpack.config.dev');
const {
choosePort,
prepareUrls,
prepareProxy
} = require('react-dev-utils/WebpackDevServerUtils');
const formatWebpackMessages = require('react-dev-utils/formatWebpackMessages');
const clearConsole = require('react-dev-utils/clearConsole');
const openBrowser = require('react-dev-utils/openBrowser');
const createDevServerConfig = require('../config/webpackDevServer.config');
const highlightElmCompilerErrors = require('./utils/highlightElmCompilerErrors');
const paths = require('../config/paths');
if (fs.existsSync('elm-package.json') === false) {
console.log('Please, run the build script from project root directory');
process.exit(0);
}
const isInteractive = process.stdout.isTTY;
function printInstructions(appName, urls) {
console.log();
console.log(`You can now view ${chalk.bold(appName)} in the browser.`);
console.log();
if (urls.lanUrlForTerminal) {
console.log(
` ${chalk.bold('Local:')} ${urls.localUrlForTerminal}`
);
console.log(
` ${chalk.bold('On Your Network:')} ${urls.lanUrlForTerminal}`
);
} else {
console.log(` ${urls.localUrlForTerminal}`);
}
console.log();
console.log('Note that the development build is not optimized.');
console.log(
`To create a production build, use ` + `${chalk.cyan('elm-app build')}.`
);
console.log();
}
function createCompiler(webpack, config, appName, urls) {
// "Compiler" is a low-level interface to Webpack.
// It lets us listen to some events and provide our own custom messages.
let compiler;
try {
compiler = webpack(config);
} catch (err) {
console.log(chalk.red('Failed to compile.'));
console.log();
console.log(err.message || err);
console.log();
process.exit(1);
}
// "invalid" event fires when you have changed a file, and Webpack is
// recompiling a bundle. WebpackDevServer takes care to pause serving the
// bundle, so if you refresh, it'll wait instead of serving the old one.
// "invalid" is short for "bundle invalidated", it doesn't imply any errors.
compiler.plugin('invalid', () => {
if (isInteractive) {
clearConsole();
}
console.log('Compiling...');
});
let isFirstCompile = true;
// "done" event fires when Webpack has finished recompiling the bundle.
// Whether or not you have warnings or errors, you will get this event.
compiler.plugin('done', stats => {
if (isInteractive) {
clearConsole();
}
// We have switched off the default Webpack output in WebpackDevServer
// options so we are going to "massage" the warnings and errors and present
// them in a readable focused way.
const messages = highlightElmCompilerErrors(
formatWebpackMessages(stats.toJson({}, true))
);
const isSuccessful = !messages.errors.length && !messages.warnings.length;
if (isSuccessful) {
console.log(chalk.green('Compiled successfully!'));
}
if (isSuccessful && (isInteractive || isFirstCompile)) {
printInstructions(appName, urls);
}
isFirstCompile = false;
// If errors exist, only show errors.
if (messages.errors.length) {
console.log(chalk.red('Failed to compile.\n'));
console.log(messages.errors.join('\n\n'));
return;
}
// Show warnings if no errors were found.
if (messages.warnings.length) {
console.log(chalk.yellow('Compiled with warnings.\n'));
console.log(messages.warnings.join('\n\n'));
// Teach some ESLint tricks.
console.log(
'\nSearch for the ' +
chalk.underline(chalk.yellow('keywords')) +
' to learn more about each warning.'
);
console.log(
'To ignore, add ' +
chalk.cyan('// eslint-disable-next-line') +
' to the line before.\n'
);
}
});
return compiler;
}
// Tools like Cloud9 rely on this.
const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000;
const HOST = process.env.HOST || '0.0.0.0';
// We attempt to use the default port but if it is busy, we offer the user to
// run on a different port. `detect()` Promise resolves to the next free port.
choosePort(HOST, DEFAULT_PORT)
.then(port => {
if (port == null) {
// We have not found a port.
return;
}
const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
const appName = path.basename(path.dirname(paths.elmPackageJson));
const urls = prepareUrls(protocol, HOST, port);
// Create a webpack compiler that is configured with custom messages.
const compiler = createCompiler(webpack, config, appName, urls);
// Load proxy config
const proxySetting = require(paths.elmPackageJson).proxy;
const proxyConfig = prepareProxy(proxySetting, '/');
// Serve webpack assets generated by the compiler over a web sever.
const serverConfig = createDevServerConfig(
proxyConfig,
urls.lanUrlForConfig
);
const devServer = new WebpackDevServer(compiler, serverConfig);
// Launch WebpackDevServer.
devServer.listen(port, HOST, err => {
if (err) {
return console.log(err);
}
if (isInteractive) {
clearConsole();
}
console.log(chalk.cyan('Starting the development server...\n'));
openBrowser(urls.localUrlForBrowser);
});
['SIGINT', 'SIGTERM'].forEach(sig => {
process.on(sig, () => {
devServer.close();
process.exit();
});
});
})
.catch(err => {
if (err && err.message) {
console.log(err.message);
}
process.exit(1);
});