text: "use strict";
  
  const conversions = require("webidl-conversions");
  const utils = require("./utils.js");
  
  const implSymbol = utils.implSymbol;
  const ctorRegistrySymbol = utils.ctorRegistrySymbol;
  
  const interfaceName = "FileList";
  
  exports.is = value => {
    return utils.isObject(value) && utils.hasOwn(value, implSymbol) && value[implSymbol] instanceof Impl.implementation;
  };
  exports.isImpl = value => {
    return utils.isObject(value) && value instanceof Impl.implementation;
  };
  exports.convert = (globalObject, value, { context = "The provided value" } = {}) => {
    if (exports.is(value)) {
      return utils.implForWrapper(value);
    }
    throw new globalObject.TypeError(`${context} is not of type 'FileList'.`);
  };
  
  function makeWrapper(globalObject, newTarget) {
    let proto;
    if (newTarget !== undefined) {
      proto = newTarget.prototype;
    }
  
    if (!utils.isObject(proto)) {
      proto = globalObject[ctorRegistrySymbol]["FileList"].prototype;
    }
  
    return Object.create(proto);
  }
  
  function makeProxy(wrapper, globalObject) {
    let proxyHandler = proxyHandlerCache.get(globalObject);
    if (proxyHandler === undefined) {
      proxyHandler = new ProxyHandler(globalObject);
      proxyHandlerCache.set(globalObject, proxyHandler);
    }
    return new Proxy(wrapper, proxyHandler);
  }
  
  exports.create = (globalObject, constructorArgs, privateData) => {
    const wrapper = makeWrapper(globalObject);
    return exports.setup(wrapper, globalObject, constructorArgs, privateData);
  };
  
  exports.createImpl = (globalObject, constructorArgs, privateData) => {
    const wrapper = exports.create(globalObject, constructorArgs, privateData);
    return utils.implForWrapper(wrapper);
  };
  
  exports._internalSetup = (wrapper, globalObject) => {};
  
  exports.setup = (wrapper, globalObject, constructorArgs = [], privateData = {}) => {
    privateData.wrapper = wrapper;
  
    exports._internalSetup(wrapper, globalObject);
    Object.defineProperty(wrapper, implSymbol, {
      value: new Impl.implementation(globalObject, constructorArgs, privateData),
      configurable: true
    });
  
    wrapper = makeProxy(wrapper, globalObject);
  
    wrapper[implSymbol][utils.wrapperSymbol] = wrapper;
    if (Impl.init) {
      Impl.init(wrapper[implSymbol]);
    }
    return wrapper;
  };
  
  exports.new = (globalObject, newTarget) => {
    let wrapper = makeWrapper(globalObject, newTarget);
  
    exports._internalSetup(wrapper, globalObject);
    Object.defineProperty(wrapper, implSymbol, {
      value: Object.create(Impl.implementation.prototype),
      configurable: true
    });
  
    wrapper = makeProxy(wrapper, globalObject);
  
    wrapper[implSymbol][utils.wrapperSymbol] = wrapper;
    if (Impl.init) {
      Impl.init(wrapper[implSymbol]);
    }
    return wrapper[implSymbol];
  };
  
  const exposed = new Set(["Window", "Worker"]);
  
  exports.install = (globalObject, globalNames) => {
    if (!globalNames.some(globalName => exposed.has(globalName))) {
      return;
    }
  
    const ctorRegistry = utils.initCtorRegistry(globalObject);
    class FileList {
      constructor() {
        throw new globalObject.TypeError("Illegal constructor");
      }
  
      item(index) {
        const esValue = this !== null && this !== undefined ? this : globalObject;
        if (!exports.is(esValue)) {
          throw new globalObject.TypeError("'item' called on an object that is not a valid instance of FileList.");
        }
  
        if (arguments.length < 1) {
          throw new globalObject.TypeError(
            `Failed to execute 'item' on 'FileList': 1 argument required, but only ${arguments.length} present.`
          );
        }
        const args = [];
        {
          let curArg = arguments[0];
          curArg = conversions["unsigned long"](curArg, {
            context: "Failed to execute 'item' on 'FileList': parameter 1",
            globals: globalObject
          });
          args.push(curArg);
        }
        return utils.tryWrapperForImpl(esValue[implSymbol].item(...args));
      }
  
      get length() {
        const esValue = this !== null && this !== undefined ? this : globalObject;
  
        if (!exports.is(esValue)) {
          throw new globalObject.TypeError("'get length' called on an object that is not a valid instance of FileList.");
        }
  
        return esValue[implSymbol]["length"];
      }
    }
    Object.defineProperties(FileList.prototype, {
      item: { enumerable: true },
      length: { enumerable: true },
      [Symbol.toStringTag]: { value: "FileList", configurable: true },
      [Symbol.iterator]: { value: globalObject.Array.prototype[Symbol.iterator], configurable: true, writable: true }
    });
    ctorRegistry[interfaceName] = FileList;
  
    Object.defineProperty(globalObject, interfaceName, {
      configurable: true,
      writable: true,
      value: FileList
    });
  };
  
  const proxyHandlerCache = new WeakMap();
  class ProxyHandler {
    constructor(globalObject) {
      this._globalObject = globalObject;
    }
  
    get(target, P, receiver) {
      if (typeof P === "symbol") {
        return Reflect.get(target, P, receiver);
      }
      const desc = this.getOwnPropertyDescriptor(target, P);
      if (desc === undefined) {
        const parent = Object.getPrototypeOf(target);
        if (parent === null) {
          return undefined;
        }
        return Reflect.get(target, P, receiver);
      }
      if (!desc.get && !desc.set) {
        return desc.value;
      }
      const getter = desc.get;
      if (getter === undefined) {
        return undefined;
      }
      return Reflect.apply(getter, receiver, []);
    }
  
    has(target, P) {
      if (typeof P === "symbol") {
        return Reflect.has(target, P);
      }
      const desc = this.getOwnPropertyDescriptor(target, P);
      if (desc !== undefined) {
        return true;
      }
      const parent = Object.getPrototypeOf(target);
      if (parent !== null) {
        return Reflect.has(parent, P);
      }
      return false;
    }
  
    ownKeys(target) {
      const keys = new Set();
  
      for (const key of target[implSymbol][utils.supportedPropertyIndices]) {
        keys.add(`${key}`);
      }
  
      for (const key of Reflect.ownKeys(target)) {
        keys.add(key);
      }
      return [...keys];
    }
  
    getOwnPropertyDescriptor(target, P) {
      if (typeof P === "symbol") {
        return Reflect.getOwnPropertyDescriptor(target, P);
      }
      let ignoreNamedProps = false;
  
      if (utils.isArrayIndexPropName(P)) {
        const index = P >>> 0;
        const indexedValue = target[implSymbol].item(index);
        if (indexedValue !== null) {
          return {
            writable: false,
            enumerable: true,
            configurable: true,
            value: utils.tryWrapperForImpl(indexedValue)
          };
        }
        ignoreNamedProps = true;
      }
  
      return Reflect.getOwnPropertyDescriptor(target, P);
    }
  
    set(target, P, V, receiver) {
      if (typeof P === "symbol") {
        return Reflect.set(target, P, V, receiver);
      }
      // The `receiver` argument refers to the Proxy exotic object or an object
      // that inherits from it, whereas `target` refers to the Proxy target:
      if (target[implSymbol][utils.wrapperSymbol] === receiver) {
        const globalObject = this._globalObject;
      }
      let ownDesc;
  
      if (utils.isArrayIndexPropName(P)) {
        const index = P >>> 0;
        const indexedValue = target[implSymbol].item(index);
        if (indexedValue !== null) {
          ownDesc = {
            writable: false,
            enumerable: true,
            configurable: true,
            value: utils.tryWrapperForImpl(indexedValue)
          };
        }
      }
  
      if (ownDesc === undefined) {
        ownDesc = Reflect.getOwnPropertyDescriptor(target, P);
      }
      if (ownDesc === undefined) {
        const parent = Reflect.getPrototypeOf(target);
        if (parent !== null) {
          return Reflect.set(parent, P, V, receiver);
        }
        ownDesc = { writable: true, enumerable: true, configurable: true, value: undefined };
      }
      if (!ownDesc.writable) {
        return false;
      }
      if (!utils.isObject(receiver)) {
        return false;
      }
      const existingDesc = Reflect.getOwnPropertyDescriptor(receiver, P);
      let valueDesc;
      if (existingDesc !== undefined) {
        if (existingDesc.get || existingDesc.set) {
          return false;
        }
        if (!existingDesc.writable) {
          return false;
        }
        valueDesc = { value: V };
      } else {
        valueDesc = { writable: true, enumerable: true, configurable: true, value: V };
      }
      return Reflect.defineProperty(receiver, P, valueDesc);
    }
  
    defineProperty(target, P, desc) {
      if (typeof P === "symbol") {
        return Reflect.defineProperty(target, P, desc);
      }
  
      const globalObject = this._globalObject;
  
      if (utils.isArrayIndexPropName(P)) {
        return false;
      }
  
      return Reflect.defineProperty(target, P, desc);
    }
  
    deleteProperty(target, P) {
      if (typeof P === "symbol") {
        return Reflect.deleteProperty(target, P);
      }
  
      const globalObject = this._globalObject;
  
      if (utils.isArrayIndexPropName(P)) {
        const index = P >>> 0;
        return !(target[implSymbol].item(index) !== null);
      }
  
      return Reflect.deleteProperty(target, P);
    }
  
    preventExtensions() {
      return false;
    }
  }
  
  const Impl = require("../file-api/FileList-impl.js");
  