proposal-system/mobile/metro.config.js

const path = require('path');
const { getDefaultConfig, mergeConfig } = require('@react-native/metro-config');

const projectRoot = __dirname;
const monorepoRoot = path.resolve(projectRoot, '..');

const config = {
  watchFolders: [path.resolve(monorepoRoot, 'shared')],
  resolver: {
    nodeModulesPaths: [
      path.resolve(projectRoot, 'node_modules'),
      path.resolve(monorepoRoot, 'node_modules'),
    ],
  },
};

module.exports = mergeConfig(getDefaultConfig(projectRoot), config);