error Cannot find module 'metro-config/src/defaults/blacklist'

[Junhano]

Don't know what happened. I upgrade my React Native from 0.63.4 to 0.64, upgrade Cocopods and this errors appear when I try to run my app. Before the upgrades everything works fine

My metro.config.js file

const blacklist = require('metro-config/src/defaults/blacklist');

module.exports = {
  resolver: {
    blacklistRE: blacklist([/#current-cloud-backend\/.*/]),
  },
  transformer: {
    getTransformOptions: async () => ({
      transform: {
        experimentalImportSupport: false,
        inlineRequires: false,
      },
    }),
  },
};

[efstathiosntonas]

I think blacklist naming has changed a bit, please visit the blacklist source code and check what has changed.

[efstathiosntonas]

@Junhano check this: https://stackoverflow.com/a/41963217/2195000

const exclusionList = require('metro-config/src/defaults/exclusionList');

// exclusionList is a function that takes an array of regexes and combines
// them with the default exclusions to return a single regex.

module.exports = {
  resolver: {
    blacklistRE: exclusionList([/dist\/.*/])
  }
};

[xxsnakerxx]

https://facebook.github.io/metro/docs/configuration/#blocklist

[Junhano]

Fixed

[ferdicus]

@Junhano, I'm happy that you got your issue resolved - would you kindly post the solution to your problem, so other people stumbling over the issue can actually jump straight to the resolution?
Thanks

[iJimmyWei]

It looks like blacklist was renamed to exclusionList for inclusive language reasons in .64 (facebook/metro@3e2d911)

For me excluding dist with efstathiosntonas's example was too destructive. I adapted it and this worked out for me:

metro.config.js

const path = require("path");
const exclusionList = require('metro-config/src/defaults/exclusionList');
const escape = require("escape-string-regexp");
const pak = require("../package.json");

const root = path.resolve(__dirname, "..");

const modules = Object.keys({
    ...pak.peerDependencies,
});

module.exports = {
    resolver: {
        blacklistRE: exclusionList(
            modules.map(
                (m) =>
                    new RegExp(`^${escape(path.join(root, "node_modules", m))}\\/.*$`)
            ))
    },
};

[ferdicus]

Yep, just a name change indeed:

// exclusionList is a function that takes an array of regexes and combines
// them with the default exclusions to return a single regex.
const exclusionList = require('metro-config/src/defaults/exclusionList');

blacklist => exclusionList