react-native/ReactAndroid/src/main/java/com/facebook/react/bridge/JSIModuleHolder.java

package com.facebook.react.bridge;

public class JSIModuleHolder {

  private JSIModule mModule;
  private final JSIModuleSpec mSpec;

  public JSIModuleHolder(JSIModuleSpec spec) {
    mSpec = spec;
  }

  public JSIModule getJSIModule() {
    if (mModule == null) {
      synchronized (this) {
        if (mModule != null) {
          return mModule;
        }
        mModule = mSpec.getJSIModuleProvider().get();
      }
    }
    return mModule;
  }
}