@anycable/protobuf-encoder/enum_wrapper.js

Protobuf encoder for AnyCable client

// This is a wrapper around enum objects, generated by protobufjs library
// Protobufjs compiles enums as a POJOs, but with a catch: their prototypes
// hold inversed hash of id-value pairs.
//
// E.g. for enum in .proto file
// enum Dummy {
//   foo = 0;
//   bar = 1;
// }
// will be generated an object{ foo: 0, bar: 1 },
// and its prototype will be { 0: foo, 1: bar }
//
// This class leverages that feature
export class EnumWrapper {
  constructor(enumValues) {
    this.values = enumValues
    this.valuesById = Object.getPrototypeOf(enumValues)
  }

  getIdByValue(value) {
    return this.values[value]
  }

  getValueById(id) {
    return this.valuesById[id]
  }
}