metro-config sharedBlacklist regexp without scape "\"

[lucasfontesgaspareto]

Do you want to request a feature or report a bug?
bug

What is the current behavior?
When i try to run react-native start an error is outputed

error Invalid regular expression: /(.*\\__fixtures__\\.*|node_modules[\\\]react[\\\]dist[\\\].*|website\\node_modules\\.*|heapCapture\\bundle\.js|.*\\__tests__\\.*)$/: Unterminated character class. Run CLI with --verbose flag for more details.
SyntaxError: Invalid regular expression: /(.*\\__fixtures__\\.*|node_modules[\\\]react[\\\]dist[\\\].*|website\\node_modules\\.*|heapCapture\\bundle\.js|.*\\__tests__\\.*)$/: Unterminated character class
    at new RegExp (<anonymous>)
    at blacklist (C:\Users\***\react\myApp\node_modules\metro-config\src\defaults\blacklist.js:34:10)
    at getBlacklistRE (C:\Users\***\react\myApp\node_modules\@react-native-community\cli\build\tools\loadMetroConfig.js:69:59)
    at getDefaultConfig (C:\Users\***\react\myApp\node_modules\@react-native-community\cli\build\tools\loadMetroConfig.js:85:20)
    at load (C:\Users\***\react\myApp\node_modules\@react-native-community\cli\build\tools\loadMetroConfig.js:121:25)
    at Object.runServer [as func] (C:\Users\***\react\myApp\node_modules\@react-native-community\cli\build\commands\server\runServer.js:82:58)
    at Command.handleAction (C:\Users\***\react\myApp\node_modules\@react-native-community\cli\build\cliEntry.js:160:21)
    at Command.listener (C:\Users\***\react\myApp\node_modules\commander\index.js:315:8)
    at Command.emit (events.js:210:5)
    at Command.parseArgs (C:\Users\***\react\myApp\node_modules\commander\index.js:651:12)

Please provide your exact Metro configuration and mention your Metro, node, yarn/npm - =-- - version and operating system.

• See above for metro config.
• Windows 10 x64
• node v12.11.0
• npm@6.11.3
• metro@0.56.0
• metro-config@0.56.0

[halkliff]

This bug is caused due to Node's parsing of regular expressions in Node versions >=12.11.0.

These regular expressions should be fixed without any compatibility issues with older Node versions...

[fffaria]

12.11.0 did not work for me, only 12.10.0 (Did not test below that but probably works) managed to fix the error, weirdly.

[ruman]

Thank you @RohitChattopadhyay, your changes worked on my windows 10.

This problem occurred when I run expo start for react-native application.

[gabsrl]

I was having the same problem. I was using node version 12.11.1 . I've changed to the LTS version of node and now everything is working fine.

[malFuckingFurion]

Try
npm install metro-core

[huuchi207]

Try
npm install metro-core

not work for me

[xunzhou]

As mentioned on stackoverflow.
Escaping '/' of sharedBlacklist
in \node_modules\metro-config\src\defaults\blacklist.js works for me on node v12.13.0

[dalgrande]

@xunzhou That's worked very well for me in Windows 10. Thanks.

[armohammadi56]

I just got a similar error for the first time today. It appears in \node_modules\metro-config\src\defaults\blacklist.js, there is an invalid regular expression that needed changed. I changed the first expression under sharedBlacklist from:

var sharedBlacklist = [
/node_modules[/\]react[/\]dist[/\]./,
/website/node_modules/./,
/heapCapture/bundle.js/,
/./tests/./
];

to:

var sharedBlacklist = [
/node_modules[/\]react[/\]dist[/\]./,
/website/node_modules/./,
/heapCapture/bundle.js/,
/./tests/./
];