@rnx-kit/metro-plugin-duplicates-checker

@rnx-kit/metro-plugin-duplicates-checker checks for duplicate packages in your bundle.

Usage

There are several ways to use this package.

The recommended way is to add it as a plugin in your metro.config.js using @rnx-kit/metro-serializer:

 const { makeMetroConfig } = require("@rnx-kit/metro-config");
+const {
+  DuplicateDependencies,
+} = require("@rnx-kit/metro-plugin-duplicates-checker");
+const { MetroSerializer } = require("@rnx-kit/metro-serializer");

 module.exports = makeMetroConfig({
   serializer: {
+    customSerializer: MetroSerializer([DuplicateDependencies()]),
   },
 });

You can also check for duplicate packages after a bundle is created:

const {
  checkForDuplicatePackagesInFile,
} = require("@rnx-kit/metro-plugin-duplicates-checker");

checkForDuplicatePackagesInFile(pathToSourceMapFile, {
  ignoredModules: [],
  bannedModules: [],
});

If you have a source map object, you can pass that directly to checkForDuplicatePackages():

const {
  checkForDuplicatePackages,
} = require("@rnx-kit/metro-plugin-duplicates-checker");

checkForDuplicatePackages(mySourceMap, {
  ignoredModules: [],
  bannedModules: [],
});

Options

Key	Type	Default	Description
bannedModules	string[]	[]	List of modules that are banned.
ignoredModules	string[]	[]	List of modules that can be ignored.
throwOnError	boolean	true	Whether to throw when duplicates are found.