Fresh react native EXPO app is not working

Question

I just create a react native app using the following command:

expo init first-react-native

And try run this app using

expo start

But I am getting the following error:

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. Metro Bundler process exited with code 1

N.B: I am novice to react native and struggling to resolve this issues but no luck. Any idea?

I think doc said you could also use npm start, see if it has the same issue — Yunhai
– Yunhai, Commented Oct 23, 2019 at 21:02

Abdeen · Accepted Answer · 2019-10-23 23:14:26Z

Problem

This is caused by node v12.11.0 due to the way it deals regular location. You can try one of these solutions to resolve this.

Solution 1

Try installing the latest version of Node or you can downgrade to node v12.10.0 this will apply the correct way to deal with parsing error

Solution 2

You can correctly terminate the regular expression in your case by changing the file located in:

\node_modules\metro-config\src\defaults\blacklist.js

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__\/.*/ ];

Hope this Helps!

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