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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 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 semver = require("semver");
const paths = require("../config/paths");
const configFactory = require("../config/webpack.config");
const createDevServerConfig = require("../config/webpackDevServer.config");
const getClientEnvironment = require("../config/env");
const react = require(require.resolve("react", { paths: [paths.appPath] }));
const env = getClientEnvironment(paths.publicUrlOrPath.slice(0, -1));
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://cra.link/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,
paths.publicUrlOrPath.slice(0, -1)
);
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,
paths.publicUrlOrPath
);
// 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();
}
if (env.raw.FAST_REFRESH && semver.lt(react.version, "16.10.0")) {
console.log(
chalk.yellow(
`Fast Refresh requires React 16.10 or higher. You are using React ${react.version}.`
)
);
}
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();
});
});
if (process.env.CI !== "true") {
// Gracefully exit when stdin ends
process.stdin.on("end", function () {
devServer.close();
process.exit();
});
}
})
.catch((err) => {
if (err && err.message) {
console.log(err.message);
}
process.exit(1);
});