discord-decomp/_hermes/prelude.js

// Runtime helpers referenced by decompiled Hermes bytecode.
var HermesBuiltin = (function () {
  var templates = {};
  return {
    silentSetPrototypeOf: function (object, proto) {
      try {
        Object.setPrototypeOf(object, proto);
      } catch (e) {}
    },
    getTemplateObject: function (id, dup) {
      if (templates[id]) return templates[id];
      var strings = Array.prototype.slice.call(arguments, 2);
      var raw = dup ? strings : strings.slice(0, strings.length / 2);
      var cooked = dup ? strings.slice() : strings.slice(strings.length / 2);
      Object.defineProperty(cooked, "raw", { value: Object.freeze(raw.slice()) });
      return (templates[id] = Object.freeze(cooked));
    },
    ensureObject: function (value, message) {
      if ((typeof value !== "object" || value === null) && typeof value !== "function") {
        throw new TypeError(message);
      }
    },
    getMethod: function (object, key) {
      var method = object[key];
      if (method === undefined || method === null) return undefined;
      if (typeof method !== "function") throw new TypeError("not a function");
      return method;
    },
    throwTypeError: function (message) {
      throw new TypeError(message);
    },
    generatorSetDelegated: function () {},
    copyDataProperties: function (target, source, excluded) {
      if (source === null || source === undefined) return target;
      var keys = Reflect.ownKeys(Object(source));
      for (var i = 0; i < keys.length; i++) {
        var key = keys[i];
        if (excluded && Object.prototype.hasOwnProperty.call(excluded, key)) continue;
        if (Object.prototype.propertyIsEnumerable.call(source, key)) target[key] = source[key];
      }
      return target;
    },
    arraySpread: function (target, source, index) {
      var iterator = source[Symbol.iterator]();
      for (var step = iterator.next(); !step.done; step = iterator.next()) {
        target[index++] = step.value;
      }
      return index;
    },
    apply: function (fn, args, thisArg) {
      return arguments.length < 3 ? Reflect.construct(fn, args) : fn.apply(thisArg, args);
    },
    exportAll: function (exports, source) {
      Object.keys(source).forEach(function (key) {
        if (key === "default" || Object.prototype.hasOwnProperty.call(exports, key)) return;
        Object.defineProperty(exports, key, {
          enumerable: true,
          get: function () {
            return source[key];
          },
        });
      });
    },
    exponentiationOperator: function (a, b) {
      return Math.pow(a, b);
    },
    initRegexNamedGroups: function () {},
    getOriginalNativeErrorConstructor: function (name) {
      return globalThis[name];
    },
    spawnAsync: function (generatorFunction, self, args) {
      return new Promise(function (resolve, reject) {
        var generator = generatorFunction.apply(self, args);
        function step(resume) {
          var next;
          try {
            next = resume();
          } catch (e) {
            reject(e);
            return;
          }
          if (next.done) {
            resolve(next.value);
            return;
          }
          Promise.resolve(next.value).then(
            function (value) {
              step(function () {
                return generator.next(value);
              });
            },
            function (error) {
              step(function () {
                return generator["throw"](error);
              });
            }
          );
        }
        step(function () {
          return generator.next(undefined);
        });
      });
    },
  };
})();

if (typeof HermesInternal === "undefined") {
  globalThis.HermesInternal = {
    concat: function () {
      return String.prototype.concat.apply(String(this), arguments);
    },
  };
}

// v96 generator bodies are native generators that start with a priming
// `yield` and receive {k, v} resumptions (k: 0 = next, 1 = return), so the
// compiled return/finally paths run exactly as in Hermes.
function $Delegated(result) {
  this.result = result;
}
function $wrapGenerator(native) {
  native.next();
  var generator = Object.create($wrapGenerator.prototype);
  function unwrap(step) {
    return step.value instanceof $Delegated ? step.value.result : step;
  }
  generator.next = function (value) {
    return unwrap(native.next({ k: 0, v: value }));
  };
  generator["return"] = function (value) {
    return unwrap(native.next({ k: 1, v: value }));
  };
  generator["throw"] = function (error) {
    return unwrap(native["throw"](error));
  };
  return generator;
}
$wrapGenerator.prototype[Symbol.iterator] = function () {
  return this;
};

function $forInKeys(object) {
  var keys = [];
  if (object === null || object === undefined) return keys;
  for (var key in object) keys.push(key);
  return keys;
}

// v98 compiles generators to a resumable function called with
// (action, value) where action 0 = next, 1 = throw, 2 = return.
function $createGenerator(step) {
  var generator = Object.create($createGenerator.prototype);
  generator.next = function (value) {
    return step.call(generator, 0, value);
  };
  generator["throw"] = function (value) {
    return step.call(generator, 1, value);
  };
  generator["return"] = function (value) {
    return step.call(generator, 2, value);
  };
  return generator;
}
$createGenerator.prototype[Symbol.iterator] = function () {
  return this;
};

function $callWithNewTarget(callee, self, newTarget) {
  var args = Array.prototype.slice.call(arguments, 3);
  return newTarget === undefined ? callee.apply(self, args) : Reflect.construct(callee, args, newTarget);
}

// Closures whose environment is read directly by inlined code.
function $withEnv(closure, environment) {
  Object.defineProperty(closure, "$env", { value: environment });
  return closure;
}

function $deriveClass(constructor, superClass) {
  Object.setPrototypeOf(constructor, superClass === null ? Function.prototype : superClass);
  constructor.prototype = Object.create(superClass === null ? null : superClass.prototype, {
    constructor: { value: constructor, writable: true, configurable: true },
  });
  return constructor;
}

export { HermesBuiltin, $Delegated, $wrapGenerator, $forInKeys, $createGenerator, $callWithNewTarget, $withEnv, $deriveClass };