implab/implabjs-core Commit - r163:4031b379ac68

Rewritten safe::debounce

cin -

r163:4031b379ac68 v1.4.1 default

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r163:4031b379ac68

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src/main/ts/safe.ts +28 -28

-             import { ICancellable, Constructor, IDestroyable, ICancellation, IRemovable } from "./interfaces";
+             import { Cancellation } from "./Cancellation";
+             import { ICancellable, Constructor, IDestroyable, ICancellation, IRemovable, PromiseOrValue } from "./interfaces";
              let _nextOid = 0;
              const _oid = typeof Symbol === "function" ?
                  Symbol("__implab__oid__") :
                  "__implab__oid__";
              function _noop() { }
              export function oid(instance: null | undefined): undefined;
              export function oid(instance: NonNullable<any>): string;
              export function oid(instance: any): string | undefined {
                  if (isNull(instance))
                      return undefined;
                  if (_oid in instance)
                      return instance[_oid];
                  else
                      return (instance[_oid] = "oid_" + (++_nextOid));
              }
              const cancellationNone: ICancellation = {
                  isSupported(): boolean {
                      return false;
                  },
                  throwIfRequested(): void {
                  },
                  isRequested(): boolean {
                      return false;
                  },
                  register(_cb: (e: any) => void): IDestroyable {
                      return destroyed;
                  }
              };
              export function keys<T>(arg: T): (Extract<keyof T, string>)[] {
                  return isObject(arg) && arg ? Object.keys(arg) as (Extract<keyof T, string>)[] : [];
              }
              export function isKeyof<T>(k: string, target: T): k is Extract<keyof T, string> {
                  return target && typeof target === "object" && k in target;
              }
              export function argumentNotNull(arg: any, name: string) {
                  if (arg === null || arg === undefined)
                      throw new Error("The argument " + name + " can't be null or undefined");
              }
              export function argumentNotEmptyString(arg: any, name: string) {
                  if (typeof (arg) !== "string" || !arg.length)
                      throw new Error("The argument '" + name + "' must be a not empty string");
              }
              export function argumentNotEmptyArray(arg: any, name: string) {
                  if (!(arg instanceof Array) || !arg.length)
                      throw new Error("The argument '" + name + "' must be a not empty array");
              }
              export function argumentOfType(arg: any, type: Constructor<{}>, name: string) {
                  if (!(arg instanceof type))
                      throw new Error("The argument '" + name + "' type doesn't match");
              }
              export function isNull(val: any): val is null | undefined {
                  return (val === null || val === undefined);
              }
              export type primitive = symbol | string | number | boolean | undefined | null;
              export function isPrimitive(val: any): val is primitive {
                  return (val === null || val === undefined || typeof (val) === "string" ||
                      typeof (val) === "number" || typeof (val) === "boolean");
              }
              export function isObject<T>(value: T): value is Exclude<T & object, primitive> {
                  return !!(value && typeof value === "object");
              }
              export function isInteger(val: any): val is number {
                  return parseInt(val, 10) === val;
              }
              export function isNumber(val: any): val is number {
                  return parseFloat(val) === val;
              }
              export function isString(val: any): val is string {
                  return typeof (val) === "string";
              }
              export function isPromise<T = any>(val: any): val is PromiseLike<T> {
                  return !!(val && typeof val.then === "function");
              }
              export function isCancellable(val: any): val is ICancellable {
                  return !!(val && typeof val.cancel === "function");
              }
              export function isNullOrEmptyString(val: any): val is ("" | null | undefined) {
                  return (val === null || val === undefined ||
                      ((typeof (val) === "string" || val instanceof String) && val.length === 0));
              }
              export function isNotEmptyArray<T = any>(arg: any): arg is T[] {
                  return (arg instanceof Array && arg.length > 0);
              }
              function _isStrictMode(this: any) {
                  return !this;
              }
              function _getNonStrictGlobal(this: any) {
                  return this;
              }
              export function getGlobal() {
                  // in es3 we can't use indirect call to eval, since it will
                  // be executed in the current call context.
                  if (!_isStrictMode()) {
                      return _getNonStrictGlobal();
                  } else {
                      // tslint:disable-next-line:no-eval
                      return eval.call(null, "this");
                  }
              }
              export function get(member: string, context?: object) {
                  argumentNotEmptyString(member, "member");
                  let that = context || getGlobal();
                  const parts = member.split(".");
                  for (const m of parts) {
                      if (!m)
                          continue;
                      if (isNull(that = that[m]))
                          break;
                  }
                  return that;
              }
              /**
               * Выполняет метод для каждого элемента массива, останавливается, когда
               * либо достигнут конец массива, либо функция <c>cb</c> вернула
               * значение.
               *
               * @param {Array | Object} obj массив элементов для просмотра
               * @param {Function} cb функция, вызываемая для каждого элемента
               * @param {Object} thisArg значение, которое будет передано в качестве
               *                <c>this</c> в <c>cb</c>.
               * @returns {void}
               */
              export function each<T>(obj: T, cb: <X extends Extract<keyof T, string>>(v: NonNullable<T[X]>, k: X) => void): void;
              export function each<T>(array: T[], cb: (v: T, i: number) => void): void;
              export function each(obj: any, cb: any, thisArg?: any): any;
              export function each(obj: any, cb: any, thisArg?: any) {
                  argumentNotNull(cb, "cb");
                  if (obj instanceof Array) {
                      let v: any;
                      for (let i = 0; i < obj.length; i++) {
                          v = obj[i];
                          if (v !== undefined)
                              cb.call(thisArg, v, i);
                      }
                  } else {
                      Object.keys(obj).forEach(k => obj[k] !== undefined && cb.call(thisArg, obj[k], k));
                  }
              }
              /** Copies property values from a source object to the destination and returns
               * the destination object.
               *
               * @param dest The destination object into which properties from the source
               *  object will be copied.
               * @param source The source of values which will be copied to the destination
               *  object.
               * @param template An optional parameter specifies which properties should be
               *  copied from the source and how to map them to the destination. If the
               *  template is an array it contains the list of property names to copy from the
               *  source to the destination. In case of object the templates contains the map
               *  where keys are property names in the source and the values are property
               *  names in the destination object. If the template isn't specified then the
               *  own properties of the source are entirely copied to the destination.
               *
               */
              export function mixin<T extends object, S extends object>(dest: T, source: S, template?: (keyof S)[]): T & S;
              export function mixin<T extends object, S extends object, R extends object = T>(dest: T, source: S, template: { [p in keyof S]?: keyof R; }): T & R;
              export function mixin<T extends object, S extends object>(dest: T, source: S, template?: any): any {
                  argumentNotNull(dest, "dest");
                  const _res: any = dest as any;
                  if (isPrimitive(source))
                      return _res;
                  if (template instanceof Array) {
                      template.forEach(p => {
                          if (isKeyof(p, source))
                              _res[p] = source[p];
                      });
                  } else if (template) {
                      keys(source).forEach(p => {
                          if (isKeyof(p, template))
                              _res[template[p]] = source[p];
                      });
                  } else {
                      keys(source).forEach(p => _res[p] = source[p]);
                  }
                  return _res;
              }
              /** Wraps the specified function to emulate an asynchronous execution.
               * @param{Object} thisArg [Optional] Object which will be passed as 'this' to the function.
               * @param{Function|String} fn [Required] Function wich will be wrapped.
               */
              export function async<T, F extends (...args: any[]) => T | PromiseLike<T>>(
                  fn: F,
                  thisArg?: ThisParameterType<F>
              ): (...args: Parameters<F>) => PromiseLike<T>;
              export function async<T, M extends string, O extends { [m in M]?: (...args: any[]) => T | PromiseLike<T> }>(
                  fn: M,
                  thisArg: O
              ): (...args: Parameters<NonNullable<O[M]>>) => PromiseLike<T>;
              export function async(_fn: any, thisArg: any): (...args: any[]) => PromiseLike<any> {
                  let fn = _fn;
                  if (arguments.length === 2 && !(fn instanceof Function))
                      fn = thisArg[fn];
                  if (fn == null)
                      throw new Error("The function must be specified");
                  function wrapresult(x: any, e?: any): PromiseLike<any> {
                      if (e) {
                          return {
                              then(cb, eb) {
                                  try {
                                      return eb ? wrapresult(eb(e)) : this;
                                  } catch (e2) {
                                      return wrapresult(null, e2);
                                  }
                              }
                          };
                      } else {
                          if (x && x.then)
                              return x;
                          return {
                              then(cb) {
                                  try {
                                      return cb ? wrapresult(cb(x)) : this;
                                  } catch (e2) {
                                      return wrapresult(e2);
                                  }
                              }
                          };
                      }
                  }
                  return (...args) => {
                      try {
                          return wrapresult(fn.apply(thisArg, args));
                      } catch (e) {
                          return wrapresult(null, e);
                      }
                  };
              }
              export function delegate<T extends object, F extends (this: T, ...args: any[]) => any>(
                  target: T,
                  method: F
              ): OmitThisParameter<F>;
              export function delegate<M extends string, T extends { [m in M]?: (...args: any[]) => any; }>(
                  target: T,
                  method: M
              ): OmitThisParameter<T[M]>;
              export function delegate(target: any, _method: any): (...args: any[]) => any {
                  let method: any;
                  if (!(_method instanceof Function)) {
                      argumentNotNull(target, "target");
                      method = target[_method];
                      if (!(method instanceof Function))
                          throw new Error("'method' argument must be a Function or a method name");
                  } else {
                      method = _method;
                  }
                  return (...args) => {
                      return method.apply(target, args);
                  };
              }
              /** Returns promise which will be resolved after the specified amount of time.
               *
               * @param timeMs The delay before the promise will be resolved in milliseconds.
               * @param ct Optional. A cancellation token for the operation.
               */
              export function delay(timeMs: number, ct = cancellationNone) {
                  ct.throwIfRequested();
                  return new Promise<void>((resolve, reject) => {
                      const h = ct.register(e => {
                          clearTimeout(id);
                          reject(e);
                          // we don't nedd to unregister h, since ct is already disposed
                      });
                      const id = setTimeout(() => {
                          h.destroy();
                          resolve();
                      }, timeMs);
                  });
              }
-             export function debounce<T extends any[], R, This>(func: (this: This, ...args: T) => R | PromiseLike<R>, wait: number) {
+             /**
+              *  Wraps the specified function to delay its execution by the specified timeout.
+              * If the wrapped function was called multiple times before the timeout has elapsed,
+              * the target function will be executed only once.
+              * Each call to the wrapped function will return a promise is the timeout hasn't
+              * elapsed the subsequent calls to the wrapped function will reject previous promises.
+              *
+              * @param func function that accepts a cancellation token as a single
+              *  parameter and returns the callback which will be invoked.
+              * @param wait A timeout to wait before the callback should be invoked
+              * @returns The function withe the same parameters as the original callback.
+              */
+             export function debounce<T extends any[], R, This>(func: (ct: ICancellation) => ((this: This, ...args: T) => PromiseOrValue<R>), wait: number) {
                  let cancel: (e?: any) => void = _noop;
-                 const fn = function executedFunction(this: This, ...args: T) {
-                     return new Promise<R>((resolve, reject) => {
+                 let pending = Promise.resolve();
-                         // used to cleanup currently allocated resources
-                         const _cleanup = () => {
-                             cancel = _noop;
-                             clearTimeout(handle);
-                         };
+                 const fn = async function executedFunction(this: This, ...args: T) {
+                     cancel();
+                     const ct = new Cancellation(_cancel => cancel = _cancel);
-                         // used in case of cancellation of the current operation
-                         const _cancel = (e: any) => {
-                             _cleanup();
-                             reject(e);
-                         };
-                         // performs actual work
-                         const _later = () => {
-                             _cleanup();
-                             resolve(func.apply(this, args));
-                         };
-                         // cancel previously queued operation
-                         if (cancel !== _noop)
-                             cancel(new Error("Operation cancelled due to debouncing"));
-                         cancel = _cancel;
-                         const handle = setTimeout(_later, wait);
-                     });
+                     await pending;
+                     let resolve = _noop;
+                     pending = new Promise(_resolve => resolve = _resolve);
+                     try {
+                         await delay(wait, ct);
+                         return func(ct).apply(this, args);
+                     } finally {
+                         resolve();
+                     }
                  };
                  fn.cancel = (e?: any) => cancel(e);
                  return fn;
              }
              /** Returns resolved promise, awaiting this method will cause the asynchronous
               * completion of the rest of the code.
               */
              export function fork() {
                  return Promise.resolve();
              }
              /** Always throws Error, can be used as a stub for the methods which should be
               * assigned later and are required to be not null.
               */
              export function notImplemented(): never {
                  throw new Error("Not implemented");
              }
              /**
               * Iterates over the specified array of items and calls the callback `cb`, if
               * the result of the callback is a promise the next item from the array will be
               * proceeded after the promise is resolved.
               *
               */
              export function pmap<T, T2>(
                  items: ArrayLike<T> | PromiseLike<ArrayLike<T>>,
                  cb: (item: T, i: number) => T2 | PromiseLike<T2>
              ): T2[] | PromiseLike<T2[]> {
                  argumentNotNull(cb, "cb");
                  if (isPromise(items)) {
                      return items.then(data => pmap(data, cb));
                  } else {
                      if (isNull(items) || !items.length)
                          return [];
                      let i = 0;
                      const result = new Array<T2>();
                      const next = (): any => {
                          while (i < items.length) {
                              const r = cb(items[i], i);
                              const ri = i;
                              i++;
                              if (isPromise(r)) {
                                  return r.then(x => {
                                      result[ri] = x;
                                      return next();
                                  });
                              } else {
                                  result[ri] = r;
                              }
                          }
                          return result;
                      };
                      return next();
                  }
              }
              export function pfor<T>(
                  items: ArrayLike<T> | PromiseLike<ArrayLike<T>>,
                  cb: (item: T, i: number) => any
              ): void | PromiseLike<void> {
                  argumentNotNull(cb, "cb");
                  if (isPromise(items)) {
                      return items.then(data => pfor(data, cb));
                  } else {
                      if (isNull(items) || !items.length)
                          return;
                      let i = 0;
                      const next = (): any => {
                          while (i < items.length) {
                              const r = cb(items[i], i);
                              i++;
                              if (isPromise(r))
                                  return r.then(next);
                          }
                      };
                      return next();
                  }
              }
              export function first<T>(sequence: ArrayLike<T>): T;
              export function first<T>(sequence: PromiseLike<ArrayLike<T>>): PromiseLike<T>;
              export function first<T>(
                  sequence: ArrayLike<T> | PromiseLike<ArrayLike<T>>,
                  cb?: (x: T) => void,
                  err?: (x: Error) => void
              ): void;
              /**
               * Выбирает первый элемент из последовательности, или обещания, если в
               * качестве параметра используется обещание, оно должно вернуть массив.
               *
               * @param {Function} cb обработчик результата, ему будет передан первый
               *                  элемент последовательности в случае успеха
               * @param {Function} err обработчик исключения, если массив пустой, либо
               *                  не массив
               *
               * @remarks Если не указаны ни cb ни err, тогда функция вернет либо
               *          обещание, либо первый элемент.
               * @async
               */
              export function first<T>(
                  sequence: ArrayLike<T> | PromiseLike<ArrayLike<T>>,
                  cb?: (x: T) => void,
                  err?: (x: Error) => void
              ) {
                  if (isPromise(sequence)) {
                      return sequence.then(res => first(res, cb as any /* force to pass undefined cb */, err));
                  } else if (sequence && "length" in sequence) {
                      if (sequence.length === 0) {
                          if (err)
                              return err(new Error("The sequence is empty"));
                          else
                              throw new Error("The sequence is empty");
                      } else if (cb) {
                          return cb(sequence[0]);
                      } else {
                          return sequence[0];
                      }
                  } else {
                      if (err)
                          return err(new Error("The sequence is required"));
                      else
                          throw new Error("The sequence is required");
                  }
              }
              export function firstWhere<T>(
                  sequence: ArrayLike<T>,
                  predicate: (x: T) => boolean
              ): T;
              export function firstWhere<T>(
                  sequence: PromiseLike<ArrayLike<T>>,
                  predicate: (x: T) => boolean
              ): PromiseLike<T>;
              export function firstWhere<T>(
                  sequence: ArrayLike<T> | PromiseLike<ArrayLike<T>>,
                  predicate: (x: T) => boolean,
                  cb: (x: T) => void,
                  err?: (x: Error) => void
              ): void;
              export function firstWhere<T>(
                  sequence: ArrayLike<T> | PromiseLike<ArrayLike<T>>,
                  predicate?: (x: T) => boolean,
                  cb?: (x: T) => any,
                  err?: (x: Error) => any
              ) {
                  if (isPromise(sequence)) {
                      return sequence.then(res => firstWhere(
                          res,
                          predicate as any /* force to pass undefined predicate */,
                          cb as any /* force to pass undefined cb */,
                          err)
                      );
                  } else if (sequence && "length" in sequence) {
                      if (sequence.length === 0) {
                          if (err)
                              err(new Error("The sequence is empty"));
                          else
                              throw new Error("The sequence is empty");
                      } else {
                          if (!predicate) {
                              return cb ? cb(sequence[0]) && void (0) : sequence[0];
                          } else {
                              for (let i = 0; i < sequence.length; i++) {
                                  const v = sequence[i];
                                  if (predicate(v))
                                      return cb ? cb(v) : v;
                              }
                              if (err)
                                  err(new Error("The sequence doesn't contain matching items"));
                              else
                                  throw new Error("The sequence doesn't contain matching items");
                          }
                      }
                  } else {
                      if (err)
                          err(new Error("The sequence is required"));
                      else
                          throw new Error("The sequence is required");
                  }
              }
              export function isDestroyable(d: any): d is IDestroyable {
                  return !!(d && typeof d.destroy === "function");
              }
              export function isRemovable(value: any): value is IRemovable {
                  return !!(value && typeof value.remove === "function");
              }
              export function destroy(d: any) {
                  if (isDestroyable(d))
                      d.destroy();
              }
              /**
               * Used to mark that the async operation isn't awaited intentionally.
               * @param p The promise which represents the async operation.
               */
              export function nowait(p: Promise<any>) {
              }
              /** represents already destroyed object.
               */
              export const destroyed = {
                  /** Calling to this method doesn't affect anything, noop.
                   */
                  destroy() {
                  }
              };

src/test/ts/tests/ContainerTests.ts +6 -4

              import { test } from "./TestTraits";
              import { Container } from "../di/Container";
              import { ReferenceDescriptor } from "../di/ReferenceDescriptor";
              import { AggregateDescriptor } from "../di/AggregateDescriptor";
              import { ValueDescriptor } from "../di/ValueDescriptor";
              import { Foo } from "../mock/Foo";
              import { Bar } from "../mock/Bar";
              import { isNull } from "../safe";
              import { Box } from "../mock/Box";
              test("Container register/resolve tests", async t => {
                  const container = new Container<{
                      "bla-bla": string;
                      "connection": string;
                      "dbParams": {
                          timeout: number;
                          connection: string;
                      }
                  }>();
                  const connection1 = "db://localhost";
                  t.throws(
                      () => container.register("bla-bla", "bla-bla" as any),
                      "Do not allow to register anything other than descriptors"
                  );
                  t.doesNotThrow(
                      () => container.register("connection", new ValueDescriptor(connection1)),
                      "register ValueDescriptor"
                  );
                  t.equals(container.resolve("connection"), connection1, "resolve string value");
                  t.doesNotThrow(
                      () => container.register(
                          "dbParams",
                          new AggregateDescriptor({
                              timeout: 10,
                              connection: new ReferenceDescriptor({ name: "connection" })
                          })
                      ),
                      "register AggregateDescriptor"
                  );
                  const dbParams = container.resolve("dbParams");
                  t.equals(dbParams.connection, connection1, "should get string value 'dbParams.connection'");
              });
              test("Container configure/resolve tests", async t => {
                  const container = new Container<{
                      foo: Foo;
                      box: Bar;
                      bar: Bar;
                      db: any;
                  }>();
                  await container.configure({
                      foo: {
                          $type: Foo
                      },
                      box: {
                          $type: Bar,
                          params: {
                              $dependency: "foo"
                          }
                      },
                      bar: {
                          $type: Bar,
                          params: [{
                              db: {
                                  provider: {
                                      $dependency: "db"
                                  }
                              }
                          }]
                      }
                  });
                  t.pass("should configure from js object");
                  const f1 = container.resolve("foo");
                  t.assert(!isNull(f1), "foo should be not null");
                  t.throws(() => container.resolve("bar"), "should not resolve dependency 'db'");
              });
              test("Load configuration from module", async t => {
                  const container = new Container();
                  await container.configure("../mock/config1", { contextRequire: require });
                  t.pass("The configuration should load");
                  const f1 = container.resolve("foo");
                  t.assert(!isNull(f1), "foo should be not null");
                  const b1 = container.resolve("bar") as Bar;
                  t.assert(!isNull(b1), "bar should not be null");
                  t.assert(!isNull(b1._v), "bar.foo should not be null");
              });
              test("Optional dependency with child container", async t => {
                  const container = new Container<{
                      foo?: Foo;
-                     box: Box<Foo>;
+                     box: Box<Bar>;
+                     bar: Bar;
                  }>();
                  await container.fluent({
-                     box: it => it.factory($ => new Box($("foo")))
+                     box: it => it.factory($ => new Box($("bar"))),
+                     bar: it => it.factory($ => new Bar({ host: "local", foo: $("foo") }, "bar"))
                  });
                  const child = await container.createChildContainer()
                      .fluent({
                          foo: it => it.factory(() => new Foo())
-                     })
+                     });
                  const box = child.resolve("box");
                  t.assert(!isNull(box.getValue()), "'foo' dependency is declared in child container");
-             });
  No newline at end of file
+             });

src/test/ts/tests/SafeTests.ts +5 -5

              import { Cancellation } from "../Cancellation";
              import { ICancellation } from "../interfaces";
              import { first, isPromise, firstWhere, delay, nowait, notImplemented, debounce, fork } from "../safe";
              import { test } from "./TestTraits";
              test("await delay test", async t => {
                  // schedule delay
                  let resolved = false;
                  let res = delay(0).then(() => resolved = true);
                  t.false(resolved, "the delay should be async");
                  await res;
                  t.pass("await delay");
                  // create cancellation token
                  let cancel: (e?: any) => void = notImplemented;
                  const ct = new Cancellation(c => cancel = c);
                  // schedule delay
                  resolved = false;
                  res = delay(0, ct).then(() => resolved = true);
                  t.false(resolved, "created delay with ct");
                  // cancel
                  cancel();
                  try {
                      await res;
                      t.fail("the delay should fail when it is cancelled");
                  } catch {
                      t.pass("the delay is cancelled");
                  }
                  t.throws(() => {
                      // try schedule delay after the cancellation is requested
                      nowait(delay(0, ct));
                  }, "Should throw if cancelled before start");
              });
              test("sequemce test", async t => {
                  const sequence = ["a", "b", "c"];
                  const empty: string[] = [];
                  // synchronous tests
                  t.equals(first(sequence), "a", "Should return the first element");
                  t.equals(firstWhere(sequence, x => x === "b"), "b", "Should get the second element");
                  let v: string | undefined;
                  let e: Error | undefined;
                  first(sequence, x => v = x);
                  t.equal(v, "a", "The callback should be called for the first element");
                  firstWhere(sequence, x => x === "b", x => v = x);
                  t.equal(v, "b", "The callback should be called for the second element");
                  t.throws(() => {
                      first(empty);
                  }, "Should throw when the sequence is empty");
                  t.throws(() => {
                      firstWhere(empty, x => x === "b");
                  }, "Should throw when the sequence is empty");
                  t.throws(() => {
                      first(empty, x => v = x);
                  }, "Should throw when the sequence is empty");
                  t.throws(() => {
                      firstWhere(empty, x => x === "b", x => v = x);
                  }, "Should throw when the sequence is empty");
                  t.throws(() => {
                      firstWhere(sequence, x => x === "z");
                  }, "Should throw when the element isn't found");
                  t.throws(() => {
                      firstWhere(sequence, x => x === "z", x => v = x);
                  }, "Should throw when the element isn't found");
                  first(empty, undefined, x => e = x);
                  t.true(e, "The errorback should be called for the empty sequence");
                  // async tests
                  const asyncSequence = Promise.resolve(sequence);
                  const asyncEmptySequence = Promise.resolve(empty);
                  const promise = first(asyncSequence);
                  t.true(isPromise(promise), "Should return promise");
                  v = await promise;
                  t.equal(v, "a", "Should return the first element");
                  v = await new Promise(resolve => first(asyncSequence, resolve));
                  t.equal(v, "a", "The callback should be called for the first element");
              });
              test("debounce tests", async (t, trace) => {
                  let count = 0;
                  let rejected = 0;
                  function increment(step: number = 1) {
                      count += step;
                      return count;
                  }
-                 const f = debounce(increment, 100);
+                 const f = debounce(() => increment, 100);
                  f().then(undefined, () => rejected++);
                  f().then(undefined, () => rejected++);
                  await f(1);
                  t.equal(rejected, 2, "Previous operations should be rejected");
                  t.equal(count, 1, "The operation should run once");
                  const acc = debounce(
-                     (...values: number[]) => count = values.reduce((a, v) => v + a, count),
+                     () => (...values: number[]) => count = values.reduce((a, v) => v + a, count),
 
                  );
                  acc(1, 2, 3).catch(() => { });
                  const result = acc(1, 2, 3);
                  acc.cancel();
                  try {
                      await result;
                      t.notOk("fn.cancel() should make current operation to throw an exception");
                  } catch {
                      t.ok("fn.cancel() should make current operation to throw an exception");
                  }
                  t.equal(count, 1, "fn.cancel() The operation should not run");
                  acc.cancel();
                  await acc(1, 2);
                  t.equal(count, 4, "The variable arguments list shoud be handled correctly");
                  // create cancellation token
                  let cancel: (e?: any) => void = notImplemented;
                  const ct = new Cancellation(c => cancel = c);
-                 const d = debounce(async () => {
-                     ct.throwIfRequested();
+                 const d = debounce(() => async (_ct: ICancellation) => {
+                     _ct.throwIfRequested();
                      trace.debug("do async increment");
                      await fork();
                      count++;
                      return count;
                  }, 0);
-                 const p = d().then(undefined, () => rejected++);
+                 const p = d(ct).then(undefined, () => rejected++);
                  cancel();
                  await p;
                  t.equal(count, 4, "Cancellation token should prevent the function execution");
                  t.equal(rejected, 3, "Cancellation token should reject operation");
              });

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