@shopify/react-native-skia/src/external/ModuleProxy.ts

High-performance React Native Graphics using Skia

// https://github.com/mrousavy/react-native-vision-camera/blob/main/package/src/dependencies/ModuleProxy.ts
type ImportType = ReturnType<typeof require>;

/**
 * Create a lazily-imported module proxy.
 * This is useful for lazily requiring optional dependencies.
 */
export const createModuleProxy = <TModule>(
  getModule: () => ImportType
): TModule => {
  const holder: { module: TModule | undefined } = { module: undefined };

  const proxy = new Proxy(holder, {
    get: (target, property) => {
      if (target.module == null) {
        // lazy initialize module via require()
        // caller needs to make sure the require() call is wrapped in a try/catch
        target.module = getModule() as TModule;
      }
      return target.module[property as keyof typeof holder.module];
    },
  });
  return proxy as unknown as TModule;
};

export class OptionalDependencyNotInstalledError extends Error {
  constructor(name: string) {
    super(`${name} is not installed!`);
  }
}