diff --git a/flow/jest.js b/flow/jest.js
new file mode 100644
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--- /dev/null
+++ b/flow/jest.js
@@ -0,0 +1,179 @@
+/**
+ * Copyright (c) 2004-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * Modified from https://raw.githubusercontent.com/flowtype/flow-typed/e3b0f3034929e0f0fb85c790450a201b380ac2fd/definitions/npm/jest_v17.x.x/flow_v0.33.x-/jest_v17.x.x.js
+ * Duplicated from www/flow/shared/jest.js
+ * @flow
+ * @format
+ */
+
+'use strict';
+
+type JestMockFn = {
+  (...args: Array<any>): any,
+  mock: {
+    calls: Array<Array<any>>,
+    instances: mixed,
+  },
+  mockClear(): Function,
+  mockReset(): Function,
+  mockImplementation(fn: Function): JestMockFn,
+  mockImplementationOnce(fn: Function): JestMockFn,
+  mockReturnThis(): void,
+  mockReturnValue(value: any): JestMockFn,
+  mockReturnValueOnce(value: any): JestMockFn,
+};
+
+type JestAsymmetricEqualityType = {
+  asymmetricMatch(value: mixed): boolean,
+};
+
+type JestCallsType = {
+  allArgs(): mixed,
+  all(): mixed,
+  any(): boolean,
+  count(): number,
+  first(): mixed,
+  mostRecent(): mixed,
+  reset(): void,
+};
+
+type JestClockType = {
+  install(): void,
+  mockDate(date: Date): void,
+  tick(): void,
+  uninstall(): void,
+};
+
+type JestMatcherResult = {
+  message?: string | (() => string),
+  pass: boolean,
+};
+
+type JestMatcher = (actual: any, expected: any) => JestMatcherResult;
+
+type JestPromiseType = {
+  /**
+   * Use rejects to unwrap the reason of a rejected promise so any other
+   * matcher can be chained. If the promise is fulfilled the assertion fails.
+   */
+  rejects: JestExpectType,
+  /**
+   * Use resolves to unwrap the value of a fulfilled promise so any other
+   * matcher can be chained. If the promise is rejected the assertion fails.
+   */
+  resolves: JestExpectType,
+};
+
+type JestExpectType = {
+  not: JestExpectType,
+  lastCalledWith(...args: Array<any>): void,
+  toBe(value: any): void,
+  toBeCalled(): void,
+  toBeCalledWith(...args: Array<any>): void,
+  toBeCloseTo(num: number, delta: any): void,
+  toBeDefined(): void,
+  toBeFalsy(): void,
+  toBeGreaterThan(number: number): void,
+  toBeGreaterThanOrEqual(number: number): void,
+  toBeLessThan(number: number): void,
+  toBeLessThanOrEqual(number: number): void,
+  toBeInstanceOf(cls: Class<*>): void,
+  toBeNull(): void,
+  toBeTruthy(): void,
+  toBeUndefined(): void,
+  toContain(item: any): void,
+  toContainEqual(item: any): void,
+  toEqual(value: any): void,
+  toHaveBeenCalled(): void,
+  toHaveBeenCalledTimes(number: number): void,
+  toHaveBeenCalledWith(...args: Array<any>): void,
+  toHaveProperty(path: string, value?: any): void,
+  toMatch(regexp: RegExp): void,
+  toMatchObject(object: Object): void,
+  toMatchSnapshot(): void,
+  toThrow(message?: string | Error | Class<Error>): void,
+  toThrowError(message?: string | Error | Class<Error> | RegExp): void,
+  toThrowErrorMatchingSnapshot(): void,
+};
+
+type JestSpyType = {
+  calls: JestCallsType,
+};
+
+declare function afterEach(fn: Function): void;
+declare function beforeEach(fn: Function): void;
+declare function afterAll(fn: Function): void;
+declare function beforeAll(fn: Function): void;
+declare function describe(name: string, fn: Function): void;
+declare var it: {
+  (name: string, fn: Function): ?Promise<void>,
+  only(name: string, fn: Function): ?Promise<void>,
+  skip(name: string, fn: Function): ?Promise<void>,
+};
+declare function fit(name: string, fn: Function): ?Promise<void>;
+declare function pit(name: string, fn: () => Promise<any>): Promise<void>;
+declare var test: typeof it;
+declare var xdescribe: typeof describe;
+declare var fdescribe: typeof describe;
+declare var xit: typeof it;
+declare var xtest: typeof it;
+
+declare var expect: {
+  (value: any): JestExpectType & JestPromiseType,
+  any: any,
+  extend(matchers: {[name: string]: JestMatcher}): void,
+  objectContaining(any): void,
+};
+declare function fail(message?: string): void;
+
+// TODO handle return type
+// http://jasmine.github.io/2.4/introduction.html#section-Spies
+declare function spyOn(value: mixed, method: string): Object;
+
+type Jest = {
+  autoMockOff(): Jest,
+  autoMockOn(): Jest,
+  resetAllMocks(): Jest,
+  clearAllTimers(): void,
+  currentTestPath(): void,
+  disableAutomock(): Jest,
+  doMock(moduleName: string, moduleFactory?: any): void,
+  dontMock(moduleName: string): Jest,
+  enableAutomock(): Jest,
+  fn(implementation?: Function): JestMockFn,
+  genMockFromModule(moduleName: string): any,
+  isMockFunction(fn: Function): boolean,
+  mock(
+    moduleName: string,
+    moduleFactory?: any,
+    options?: {virtual?: boolean},
+  ): Jest,
+  resetModuleRegistry(): Jest, // undocumented alias for resetModuleRegistry
+  resetModules(): Jest,
+  restoreAllMocks(): Jest,
+  runAllTicks(): Jest,
+  runAllTimers(): Jest,
+  runTimersToTime(msToRun: number): Jest,
+  runOnlyPendingTimers(): Jest,
+  setMock(moduleName: string, moduleExports: any): Jest,
+  unmock(moduleName: string): Jest,
+  useFakeTimers(): Jest,
+  useRealTimers(): Jest,
+};
+
+declare var jest: Jest;
+
+declare var jasmine: {
+  DEFAULT_TIMEOUT_INTERVAL: number,
+  any(value: mixed): JestAsymmetricEqualityType,
+  anything(): void,
+  arrayContaining(value: Array<mixed>): void,
+  clock(): JestClockType,
+  createSpy(name: string): JestSpyType,
+  objectContaining(value: Object): void,
+  stringMatching(value: string): void,
+};