metro.config.js

const path = require("path");
const escapeStringRegExp = require("escape-string-regexp");
const { getDefaultConfig } = require("@expo/metro-config");
const exclusionList = require("metro-config/src/defaults/exclusionList");
const pak = require("../package.json");

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

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

const defaultConfig = getDefaultConfig(__dirname);

module.exports = {
	...defaultConfig,

	projectRoot: __dirname,
	watchFolders: [root],

	// We need to make sure that only one version is loaded for peerDependencies
	// So we block them at the root, and alias them to the versions in example's node_modules
	resolver: {
		...defaultConfig.resolver,

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

		extraNodeModules: modules.reduce((acc, name) => {
			acc[name] = path.join(__dirname, "node_modules", name);
			return acc;
		}, {}),
	},
};