chevrotain/src/parse/parser/utils/apply_mixins.ts

Chevrotain is a high performance fault tolerant javascript parsing DSL for building recursive decent parsers

export function applyMixins(derivedCtor: any, baseCtors: any[]) {
  baseCtors.forEach((baseCtor) => {
    const baseProto = baseCtor.prototype;
    Object.getOwnPropertyNames(baseProto).forEach((propName) => {
      if (propName === "constructor") {
        return;
      }

      const basePropDescriptor = Object.getOwnPropertyDescriptor(
        baseProto,
        propName,
      );
      // Handle Accessors
      if (
        basePropDescriptor &&
        (basePropDescriptor.get || basePropDescriptor.set)
      ) {
        Object.defineProperty(
          derivedCtor.prototype,
          propName,
          basePropDescriptor,
        );
      } else {
        derivedCtor.prototype[propName] = baseCtor.prototype[propName];
      }
    });
  });
}