[DEPRECATED] React Native MMKV - Config plugin for Expo. You need to use "react-native-mmkv": "^1.6.2"

react-native-mmkv-plugin.js

// DEPRECATED

const {
  withDangerousMod,
  WarningAggregator,
  AndroidConfig,
  withAppBuildGradle,
} = require("@expo/config-plugins");
const path = require("path");
const fs = require("fs");

function getMMKVJSIModulePackage(packageName) {
  return `package ${packageName};
    
    import com.facebook.react.bridge.JSIModuleSpec;
    import com.facebook.react.bridge.JavaScriptContextHolder;
    import com.facebook.react.bridge.ReactApplicationContext;
    
    import com.swmansion.reanimated.ReanimatedJSIModulePackage;
    import com.reactnativemmkv.MmkvModule;
    
    import java.util.Collections;
    import java.util.List;
    
    public class MMKVJSIModulePackage extends ReanimatedJSIModulePackage {
        @Override
        public List<JSIModuleSpec> getJSIModules(ReactApplicationContext reactApplicationContext, JavaScriptContextHolder jsContext) {
            MmkvModule.install(jsContext, reactApplicationContext.getFilesDir().getAbsolutePath() + "/mmkv");
            return super.getJSIModules(reactApplicationContext, jsContext);
        }
    }`;
}

async function readFileAsync(path) {
  return fs.promises.readFile(path, "utf8");
}

async function saveFileAsync(path, content) {
  return fs.promises.writeFile(path, content, "utf8");
}

function getPackageRoot(projectRoot) {
  return path.join(projectRoot, "android", "app", "src", "main", "java");
}

function getCurrentPackageName(projectRoot, packageRoot) {
  const mainApplication = AndroidConfig.Paths.getProjectFilePath(
    projectRoot,
    "MainApplication"
  );
  const packagePath = path.dirname(mainApplication);
  const packagePathParts = path
    .relative(packageRoot, packagePath)
    .split(path.sep)
    .filter(Boolean);

  return packagePathParts.join(".");
}

async function editMainApplication(config, action) {
  const mainApplicationPath = AndroidConfig.Paths.getProjectFilePath(
    config.modRequest.projectRoot,
    "MainApplication"
  );

  try {
    const mainApplication = action(await readFileAsync(mainApplicationPath));
    return await saveFileAsync(mainApplicationPath, mainApplication);
  } catch (e) {
    WarningAggregator.addWarningAndroid(
      "react-native-mmkv",
      `Couldn't modify MainApplication.java - ${e}.`
    );
  }
}

async function createMMKVJSIModulePackage(config, action) {
  const projectRoot = config.modRequest.projectRoot;
  const packageRoot = getPackageRoot(projectRoot);
  const packageName = getCurrentPackageName(projectRoot, packageRoot);
  const filePath = path.join(
    packageRoot,
    `${packageName.split(".").join("/")}/MMKVJSIModulePackage.java`
  );

  try {
    return await saveFileAsync(filePath, getMMKVJSIModulePackage(packageName));
  } catch (e) {
    WarningAggregator.addWarningAndroid(
      "react-native-mmkv",
      `Couldn't create MMKVJSIModulePackage.java - ${e}.`
    );
  }
}

const withMMKVJSIModulePackage = (config) => {
  return withDangerousMod(config, [
    "android",
    async (config) => {
      await createMMKVJSIModulePackage(config);

      return config;
    },
  ]);
};

const withMainApplication = (config) => {
  return withDangerousMod(config, [
    "android",
    async (config) => {
      await editMainApplication(config, (mainApplication) => {
        if (mainApplication.includes('return new MMKVJSIModulePackage();')) {
          return mainApplication;
        }

        mainApplication = mainApplication.replace(
          `    @Override
    protected String getJSMainModuleName() {
      return "index";
    }`,
          `    @Override
    protected String getJSMainModuleName() {
      return "index";
    }
    
    @Override
    protected JSIModulePackage getJSIModulePackage() {
      return new MMKVJSIModulePackage();
    }`
        );

        return mainApplication;
      });

      return config;
    },
  ]);
};

const withCustomAppBuildGradle = (config) => {
  return withAppBuildGradle(config, (config) => {
    if (
      config.modResults.contents.includes(
        `implementation project(':react-native-mmkv')`
      )
    ) {
      return config;
    }

    config.modResults.contents = config.modResults.contents.replace(
      `implementation "com.facebook.react:react-native:+"  // From node_modules`,
      `implementation "com.facebook.react:react-native:+"  // From node_modules
    implementation project(':react-native-mmkv')`
    );
    return config;
  });
};

module.exports = function withMMKV(config) {
  config = withMMKVJSIModulePackage(config);
  config = withMainApplication(config);
  config = withCustomAppBuildGradle(config);
  return config;
};

@simon-ojok he provided this for free, you’re welcome to do that yourself if you want.

but also this is deprecated and isn’t needed anymore

There is no need for this plug-in anymore. It works ootb with a dev client

yes worked for me aswell