first commit

scripts/start.js

@@ -0,0 +1,140 @@
+'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';
+process.env.REACT_ADMIN = process.argv.slice(2)[0];
+
+// 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 chalk = require('react-dev-utils/chalk');
+const webpack = require('webpack');
+const WebpackDevServer = require('webpack-dev-server');
+const clearConsole = require('react-dev-utils/clearConsole');
+const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
+const {
+    choosePort,
+    createCompiler,
+    prepareProxy,
+    prepareUrls,
+} = require('react-dev-utils/WebpackDevServerUtils');
+const openBrowser = require('react-dev-utils/openBrowser');
+const paths = require('../config/paths');
+const configFactory = require('../config/webpack.config');
+const createDevServerConfig = require('../config/webpackDevServer.config');
+
+const useYarn = fs.existsSync(paths.yarnLockFile);
+const isInteractive = process.stdout.isTTY;
+
+// Warn and crash if required files are missing
+if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
+    process.exit(1);
+}
+
+// Tools like Cloud9 rely on this.
+const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000;
+const HOST = process.env.HOST || '0.0.0.0';
+
+if (process.env.HOST) {
+    console.log(
+        chalk.cyan(
+            `Attempting to bind to HOST environment variable: ${chalk.yellow(
+                chalk.bold(process.env.HOST)
+            )}`
+        )
+    );
+    console.log(
+        `If this was unintentional, check that you haven't mistakenly set it in your shell.`
+    );
+    console.log(`Learn more here: ${chalk.yellow('https://bit.ly/CRA-advanced-config')}`);
+    console.log();
+}
+
+// We require that you explicitly set browsers and do not fall back to
+// browserslist defaults.
+const { checkBrowsers } = require('react-dev-utils/browsersHelper');
+checkBrowsers(paths.appPath, isInteractive)
+    .then(() => {
+        // We attempt to use the default port but if it is busy, we offer the user to
+        // run on a different port. `choosePort()` Promise resolves to the next free port.
+        return choosePort(HOST, DEFAULT_PORT);
+    })
+    .then((port) => {
+        if (port == null) {
+            // We have not found a port.
+            return;
+        }
+        const config = configFactory('development');
+        const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
+        const appName = require(paths.appPackageJson).name;
+        const useTypeScript = fs.existsSync(paths.appTsConfig);
+        const tscCompileOnError = process.env.TSC_COMPILE_ON_ERROR === 'true';
+        const urls = prepareUrls(protocol, HOST, port);
+        const devSocket = {
+            warnings: (warnings) => devServer.sockWrite(devServer.sockets, 'warnings', warnings),
+            errors: (errors) => devServer.sockWrite(devServer.sockets, 'errors', errors),
+        };
+        // Create a webpack compiler that is configured with custom messages.
+        const compiler = createCompiler({
+            appName,
+            config,
+            devSocket,
+            urls,
+            useYarn,
+            useTypeScript,
+            tscCompileOnError,
+            webpack,
+        });
+        // Load proxy config
+        const proxySetting = require(paths.appPackageJson).proxy;
+        const proxyConfig = prepareProxy(proxySetting, paths.appPublic);
+        // Serve webpack assets generated by the compiler over a web server.
+        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();
+            }
+
+            // We used to support resolving modules according to `NODE_PATH`.
+            // This now has been deprecated in favor of jsconfig/tsconfig.json
+            // This lets you use absolute paths in imports inside large monorepos:
+            if (process.env.NODE_PATH) {
+                console.log(
+                    chalk.yellow(
+                        'Setting NODE_PATH to resolve modules absolutely has been deprecated in favor of setting baseUrl in jsconfig.json (or tsconfig.json if you are using TypeScript) and will be removed in a future major release of create-react-app.'
+                    )
+                );
+                console.log();
+            }
+
+            console.log(chalk.cyan('Starting the development server...\n'));
+            openBrowser(urls.localUrlForBrowser);
+        });
+
+        ['SIGINT', 'SIGTERM'].forEach(function (sig) {
+            process.on(sig, function () {
+                devServer.close();
+                process.exit();
+            });
+        });
+    })
+    .catch((err) => {
+        if (err && err.message) {
+            console.log(err.message);
+        }
+        process.exit(1);
+    });