react-native-scheme-manager post install script modifies getDevToolsMiddleware.js

[rplankenhorn]

Steps to reproduce the behavior

I am seeing this behavior with react-native 0.50.0 and up react-native. When I run my post install script:
{
"postinstall": "react-native-schemes-manager fix-libraries && react-native-schemes-manager fix-script",
}
node_modules/react-native/local-cli/server/middleware/getDevToolsMiddleware.js gets modified with possibly an invalid patch that breaks the build.

Expected behavior

getDevToolsMiddleware is not modified or modified correctly.

Actual behavior

getDevToolsMiddleware looks like this (notice the patch end near the middle of the file):

/* react-native-debugger-patch start */
var __opn = require('opn');
var __fs = require('fs');
var __path = require('path');
var __net = require('net');
var __childProcess = require('child_process');
var __home_env = process.platform === 'win32' ? 'USERPROFILE' : 'HOME';
var __port_file = __path.join(process.env[__home_env], '.rndebugger_port');

function __connectToRND(rndPath, log, cb) {
var __port;
try {
__port = __fs.readFileSync(__port_file, 'utf-8');
} catch (e) {
log && console.log(
'\n[RNDebugger] The port file $HOME/.rndebugger_port not found\n' +
'Maybe the React Native Debugger (^0.3) is not open?\n' +
'(Please visit https://github.com/jhen0409/react-native-debugger#installation)\n'
);
return cb(false);
}
var __c = __net.createConnection({ port: __port }, () => {
let pass = false;
__c.setEncoding('utf-8');
__c.write(JSON.stringify({ path: rndPath }));
__c.on('data', data => {
pass = data === 'success';
__c.end();
});
const __timeoutId = setTimeout(() => {
log && console.log(
'\n[RNDebugger] Cannot connect to port ' + __port + '.\n'
);
__c.end();
}, 1000);
__c.on('end', () => {
clearTimeout(__timeoutId);
log && console.log(
'\n[RNDebugger] Try to set port of React Native server failed.\n'
);
cb(pass);
});

});
}

var __rndebuggerIsOpening = false;
function launchChromeDevTools(port, skipRNDebugger) {
var __rnd_path = 'rndebugger://set-debugger-loc?host=localhost&port=' + port;

if (__rndebuggerIsOpening) return;
__rndebuggerIsOpening = true;
if (process.platform === 'darwin' && !skipRNDebugger) {
var __env = Object.assign({}, process.env);
// This env is specified from Expo (and CRNA), we need avoid it included in rndebugger
delete __env.ELECTRON_RUN_AS_NODE;
__childProcess
.spawn('open', ['-g', '-a', 'React Native Debugger', __rnd_path], { env: __env })
.once('close', code => {
if (code > 0) {
__connectToRND(__rnd_path, false, pass => {
if (!pass) {
console.log(
'\n[RNDebugger] Cannot open the app, maybe not install?\n' +
'(Please visit https://github.com/jhen0409/react-native-debugger#installation)\n' +
'Or it's never started. (Not registered URI Scheme)\n'
);
}
__rndebuggerIsOpening = false;
!pass && launchChromeDevTools(port, true);
});
} else {
__rndebuggerIsOpening = false;
}
})
return;
} else if (!skipRNDebugger) {
__connectToRND(__rnd_path, true, pass => {
__rndebuggerIsOpening = false;
!pass && launchChromeDevTools(port, true);
});
return;
}
__rndebuggerIsOpening = false;
/* react-native-debugger-patch end */
acebook, Inc.

• All rights reserved.
• This source code is licensed under the BSD-style license found in the
• LICENSE file in the root directory of this source tree. An additional grant
• of patent rights can be found in the PATENTS file in the same directory.
• @Format
  */
  'use strict';

const launchChrome = require('../util/launchChrome');

const {exec} = require('child_process');

function launchChromeDevTools(port, args = '') {
var debuggerURL = 'http://localhost:' + port + '/debugger-ui' + args;
console.log('Launching Dev Tools...');
launchChrome(debuggerURL);
}

function escapePath(pathname) {
// " Can escape paths with spaces in OS X, Windows, and *nix
return '"' + pathname + '"';
}

function launchDevTools(
{port, projectRoots, useDeltaBundler},
isChromeConnected,
) {
// Explicit config always wins
var customDebugger = process.env.REACT_DEBUGGER;
if (customDebugger) {
var projects = projectRoots.map(escapePath).join(' ');
var command = customDebugger + ' ' + projects;
console.log('Starting custom debugger by executing: ' + command);
exec(command, function(error, stdout, stderr) {
if (error !== null) {
console.log('Error while starting custom debugger: ' + error);
}
});
} else if (!isChromeConnected()) {
// Dev tools are not yet open; we need to open a session
launchChromeDevTools(port, useDeltaBundler ? '#useDeltaBundler' : '');
}
}

module.exports = function(options, isChromeConnected) {
return function(req, res, next) {
if (req.url === '/launch-safari-devtools') {
// TODO: remove console.log and dev tools binary
console.log(
'We removed support for Safari dev-tools. ' +
'If you still need this, please let us know.',
);
} else if (req.url === '/launch-chrome-devtools') {
// TODO: Remove this case in the future
console.log(
'The method /launch-chrome-devtools is deprecated. You are ' +
' probably using an application created with an older CLI with the ' +
' packager of a newer CLI. Please upgrade your application: ' +
'https://facebook.github.io/react-native/docs/upgrading.html',
);
launchDevTools(options, isChromeConnected);
res.end('OK');
} else if (req.url === '/launch-js-devtools') {
launchDevTools(options, isChromeConnected);
res.end('OK');
} else {
next();
}
};
};

[rplankenhorn]

This ended up being a problem with rndebugger-open. Closing.