metro/packager.js

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/**
* Copyright 2004-present Facebook. All Rights Reserved.
*/
'use strict';
var fs = require('fs');
var path = require('path');
if (!fs.existsSync(path.resolve(__dirname, '..', 'node_modules'))) {
console.log(
'\n' +
'Could not find dependencies.\n' +
'Ensure dependencies are installed - ' +
'run \'npm install\' from project root.\n'
);
process.exit();
}
var ReactPackager = require('./react-packager');
var blacklist = require('./blacklist.js');
var connect = require('connect');
var http = require('http');
var launchEditor = require('./launchEditor.js');
var parseCommandLine = require('./parseCommandLine.js');
var options = parseCommandLine([{
command: 'port',
default: 8081,
}, {
command: 'root',
description: 'add another root(s) to be used by the packager in this project',
}]);
if (!options.projectRoots) {
options.projectRoots = [path.resolve(__dirname, '..')];
}
if (options.root) {
if (typeof options.root === 'string') {
options.projectRoots.push(path.resolve(options.root));
} else {
options.root.forEach(function(root) {
options.projectRoots.push(path.resolve(root));
});
}
}
console.log('\n' +
' ===============================================================\n' +
' | Running packager on port ' + options.port + '. \n' +
' | Keep this packager running while developing on any JS \n' +
' | projects. Feel free to close this tab and run your own \n' +
' | packager instance if you prefer. \n' +
' | \n' +
' | https://github.com/facebook/react-native \n' +
' | \n' +
' ===============================================================\n'
);
process.on('uncaughtException', function(e) {
console.error(e);
console.error(e.stack);
console.error('\n >>> ERROR: could not create packager - please shut down ' +
'any existing instances that are already running.\n\n');
});
runServer(options, function() {
console.log('\nReact packager ready.\n');
});
function loadRawBody(req, res, next) {
req.rawBody = '';
req.setEncoding('utf8');
req.on('data', function(chunk) {
req.rawBody += chunk;
});
req.on('end', function() {
next();
});
}
function openStackFrameInEditor(req, res, next) {
if (req.url === '/open-stack-frame') {
var frame = JSON.parse(req.rawBody);
launchEditor(frame.file, frame.lineNumber);
res.end('OK');
} else {
next();
}
}
function getAppMiddleware(options) {
return ReactPackager.middleware({
projectRoots: options.projectRoots,
blacklistRE: blacklist(false),
cacheVersion: '2',
transformModulePath: require.resolve('./transformer.js'),
});
}
function runServer(
options, /* {[]string projectRoot, bool web} */
readyCallback
) {
var app = connect()
.use(loadRawBody)
.use(openStackFrameInEditor)
.use(getAppMiddleware(options));
options.projectRoots.forEach(function(root) {
app.use(connect.static(root));
});
app.use(connect.logger())
.use(connect.compress())
.use(connect.errorHandler());
return http.createServer(app).listen(options.port, readyCallback);
}