monorepo-expo-metro-config.js

const { getDefaultConfig } = require("expo/metro-config")
const path = require("path")

// Find the project and workspace directories
const projectRoot = __dirname
// This can be replaced with `find-yarn-workspace-root`
const workspaceRoot = path.resolve(projectRoot, "../..")

const config = getDefaultConfig(projectRoot)

// 1. Watch all files within the monorepo
config.watchFolders = [workspaceRoot]

// 2. Let Metro know where to resolve packages and in what order
config.resolver.nodeModulesPaths = [
  path.resolve(projectRoot, "node_modules"),
  path.resolve(workspaceRoot, "node_modules"),
]

// 3. Force Metro to resolve (sub)dependencies only from the `nodeModulesPaths`
config.resolver.disableHierarchicalLookup = true

// 4. See issue https://github.com/honojs/hono/issues/1773
config.resolver.unstable_enableSymlinks = true
config.resolver.unstable_enablePackageExports = true

module.exports = config