diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1c8a64f57487..09ee31e3d270 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## master
 
+### Features
+
+* `[jest-watch]` create new package `jest-watch` to ease custom watch plugin development ([#6318](https://github.com/facebook/jest/pull/6318))
+
 ### Fixes
 
 * `[expect]` toMatchObject throws TypeError when a source property is null ([#6313](https://github.com/facebook/jest/pull/6313))
diff --git a/packages/jest-cli/package.json b/packages/jest-cli/package.json
index 3a8b5439b955..ef2822a43801 100644
--- a/packages/jest-cli/package.json
+++ b/packages/jest-cli/package.json
@@ -28,6 +28,7 @@
     "jest-snapshot": "^23.0.1",
     "jest-util": "^23.0.1",
     "jest-validate": "^23.0.1",
+    "jest-watch": "^23.0.1",
     "jest-worker": "^23.0.1",
     "micromatch": "^2.3.11",
     "node-notifier": "^5.2.1",
diff --git a/packages/jest-cli/src/__tests__/snapshot_interactive_mode.test.js b/packages/jest-cli/src/__tests__/snapshot_interactive_mode.test.js
index 26fd83792a9f..7482116fe21b 100644
--- a/packages/jest-cli/src/__tests__/snapshot_interactive_mode.test.js
+++ b/packages/jest-cli/src/__tests__/snapshot_interactive_mode.test.js
@@ -6,16 +6,9 @@
  */
 
 import chalk from 'chalk';
-import {KEYS} from '../constants';
+import {KEYS} from 'jest-watch';
 import SnapshotInteractiveMode from '../snapshot_interactive_mode';
 
-jest.mock('../lib/terminal_utils', () => ({
-  getTerminalWidth: () => 80,
-  rightPad: () => {
-    '';
-  },
-}));
-
 jest.mock('ansi-escapes', () => ({
   clearScreen: '[MOCK - eraseDown]',
   cursorRestorePosition: '[MOCK - cursorRestorePosition]',
@@ -86,7 +79,7 @@ describe('SnapshotInteractiveMode', () => {
 
   test('press Q or ESC triggers an abort', () => {
     instance.abort = jest.fn();
-    instance.put(KEYS.Q);
+    instance.put('q');
     instance.put(KEYS.ESCAPE);
     expect(instance.abort).toHaveBeenCalledTimes(2);
   });
@@ -107,12 +100,12 @@ describe('SnapshotInteractiveMode', () => {
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.S);
+    instance.put('s');
     expect(mockCallback).toHaveBeenCalledTimes(1);
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.R);
+    instance.put('r');
     expect(instance.getSkippedNum()).toBe(0);
     expect(mockCallback).nthCalledWith(2, assertions[0], false);
     expect(mockCallback).toHaveBeenCalledTimes(2);
@@ -127,12 +120,12 @@ describe('SnapshotInteractiveMode', () => {
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.S);
+    instance.put('s');
     expect(mockCallback).toHaveBeenCalledTimes(1);
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.Q);
+    instance.put('q');
     expect(instance.getSkippedNum()).toBe(0);
     expect(mockCallback).nthCalledWith(2, null, false);
     expect(mockCallback).toHaveBeenCalledTimes(2);
@@ -157,7 +150,7 @@ describe('SnapshotInteractiveMode', () => {
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.U);
+    instance.put('u');
     expect(mockCallback).nthCalledWith(2, assertions[0], true);
     expect(mockCallback).toHaveBeenCalledTimes(2);
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
@@ -177,18 +170,18 @@ describe('SnapshotInteractiveMode', () => {
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.S);
+    instance.put('s');
     expect(mockCallback).nthCalledWith(2, assertions[1], false);
     expect(mockCallback).toHaveBeenCalledTimes(2);
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.S);
+    instance.put('s');
     expect(mockCallback).toHaveBeenCalledTimes(2);
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.R);
+    instance.put('r');
     expect(instance.getSkippedNum()).toBe(0);
     expect(mockCallback).nthCalledWith(3, assertions[0], false);
     expect(mockCallback).toHaveBeenCalledTimes(3);
@@ -224,14 +217,14 @@ describe('SnapshotInteractiveMode', () => {
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.U);
+    instance.put('u');
     expect(mockCallback).nthCalledWith(2, assertions[0], true);
     expect(mockCallback).nthCalledWith(3, assertions[1], false);
     expect(mockCallback).toHaveBeenCalledTimes(3);
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.U);
+    instance.put('u');
     expect(mockCallback).nthCalledWith(4, assertions[1], true);
     expect(mockCallback).toHaveBeenCalledTimes(4);
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
@@ -272,19 +265,19 @@ describe('SnapshotInteractiveMode', () => {
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.U);
+    instance.put('u');
     expect(mockCallback).nthCalledWith(2, assertions[0], true);
     expect(mockCallback).nthCalledWith(3, assertions[1], false);
     expect(mockCallback).toHaveBeenCalledTimes(3);
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.S);
+    instance.put('s');
     expect(mockCallback).toHaveBeenCalledTimes(3);
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.R);
+    instance.put('r');
     expect(instance.getSkippedNum()).toBe(0);
     expect(mockCallback).nthCalledWith(4, assertions[1], false);
     expect(mockCallback).toHaveBeenCalledTimes(4);
@@ -320,19 +313,19 @@ describe('SnapshotInteractiveMode', () => {
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.S);
+    instance.put('s');
     expect(mockCallback).nthCalledWith(2, assertions[1], false);
     expect(mockCallback).toHaveBeenCalledTimes(2);
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.U);
+    instance.put('u');
     expect(mockCallback).nthCalledWith(3, assertions[1], true);
     expect(mockCallback).toHaveBeenCalledTimes(3);
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
     pipe.write.mockClear();
 
-    instance.put(KEYS.R);
+    instance.put('r');
     expect(instance.getSkippedNum()).toBe(0);
     expect(mockCallback).nthCalledWith(4, assertions[0], false);
     expect(mockCallback).toHaveBeenCalledTimes(4);
diff --git a/packages/jest-cli/src/__tests__/watch.test.js b/packages/jest-cli/src/__tests__/watch.test.js
index f214d70ab058..6db65ef0ced7 100644
--- a/packages/jest-cli/src/__tests__/watch.test.js
+++ b/packages/jest-cli/src/__tests__/watch.test.js
@@ -10,8 +10,7 @@
 
 import chalk from 'chalk';
 import TestWatcher from '../test_watcher';
-import JestHooks from '../jest_hooks';
-import {KEYS} from '../constants';
+import {JestHook, KEYS} from 'jest-watch';
 
 const runJestMock = jest.fn();
 const watchPluginPath = `${__dirname}/__fixtures__/watch_plugin`;
@@ -286,7 +285,7 @@ describe('Watch mode flows', () => {
     expect(pipeMockCalls.slice(determiningTestsToRun + 1)).toMatchSnapshot();
   });
 
-  it('allows WatchPlugins to hook into JestHooks', async () => {
+  it('allows WatchPlugins to hook into JestHook', async () => {
     const apply = jest.fn();
     const pluginPath = `${__dirname}/__fixtures__/plugin_path_register`;
     jest.doMock(
@@ -498,7 +497,7 @@ describe('Watch mode flows', () => {
     watch(globalConfig, contexts, pipe, hasteMapInstances, stdin);
     runJestMock.mockReset();
 
-    stdin.emit(KEYS.O);
+    stdin.emit('o');
 
     expect(runJestMock).toBeCalled();
     expect(runJestMock.mock.calls[0][0].globalConfig).toMatchObject({
@@ -512,7 +511,7 @@ describe('Watch mode flows', () => {
     watch(globalConfig, contexts, pipe, hasteMapInstances, stdin);
     runJestMock.mockReset();
 
-    stdin.emit(KEYS.A);
+    stdin.emit('a');
 
     expect(runJestMock).toBeCalled();
     expect(runJestMock.mock.calls[0][0].globalConfig).toMatchObject({
@@ -530,12 +529,12 @@ describe('Watch mode flows', () => {
   });
 
   it('Pressing "t" reruns the tests in "test name pattern" mode', async () => {
-    const hooks = new JestHooks();
+    const hooks = new JestHook();
 
     watch(globalConfig, contexts, pipe, hasteMapInstances, stdin, hooks);
     runJestMock.mockReset();
 
-    stdin.emit(KEYS.T);
+    stdin.emit('t');
     ['t', 'e', 's', 't'].forEach(key => stdin.emit(key));
     stdin.emit(KEYS.ENTER);
     await nextTick();
@@ -549,12 +548,12 @@ describe('Watch mode flows', () => {
   });
 
   it('Pressing "p" reruns the tests in "filename pattern" mode', async () => {
-    const hooks = new JestHooks();
+    const hooks = new JestHook();
 
     watch(globalConfig, contexts, pipe, hasteMapInstances, stdin, hooks);
     runJestMock.mockReset();
 
-    stdin.emit(KEYS.P);
+    stdin.emit('p');
     ['f', 'i', 'l', 'e'].forEach(key => stdin.emit(key));
     stdin.emit(KEYS.ENTER);
     await nextTick();
@@ -568,17 +567,17 @@ describe('Watch mode flows', () => {
   });
 
   it('Can combine "p" and "t" filters', async () => {
-    const hooks = new JestHooks();
+    const hooks = new JestHook();
 
     watch(globalConfig, contexts, pipe, hasteMapInstances, stdin, hooks);
     runJestMock.mockReset();
 
-    stdin.emit(KEYS.P);
+    stdin.emit('p');
     ['f', 'i', 'l', 'e'].forEach(key => stdin.emit(key));
     stdin.emit(KEYS.ENTER);
     await nextTick();
 
-    stdin.emit(KEYS.T);
+    stdin.emit('t');
     ['t', 'e', 's', 't'].forEach(key => stdin.emit(key));
     stdin.emit(KEYS.ENTER);
     await nextTick();
@@ -592,7 +591,7 @@ describe('Watch mode flows', () => {
   });
 
   it('Pressing "u" reruns the tests in "update snapshot" mode', async () => {
-    const hooks = new JestHooks();
+    const hooks = new JestHook();
 
     globalConfig.updateSnapshot = 'new';
 
@@ -601,7 +600,7 @@ describe('Watch mode flows', () => {
 
     hooks.getEmitter().onTestRunComplete({snapshot: {failure: true}});
 
-    stdin.emit(KEYS.U);
+    stdin.emit('u');
     await nextTick();
 
     expect(runJestMock.mock.calls[0][0].globalConfig).toMatchObject({
@@ -610,7 +609,7 @@ describe('Watch mode flows', () => {
       watchAll: false,
     });
 
-    stdin.emit(KEYS.A);
+    stdin.emit('a');
 
     await nextTick();
     // updateSnapshot is not sticky after a run.
@@ -622,11 +621,11 @@ describe('Watch mode flows', () => {
 
     results = {snapshot: {failure: true}};
 
-    stdin.emit(KEYS.A);
+    stdin.emit('a');
     await nextTick();
 
     runJestMock.mockReset();
-    stdin.emit(KEYS.U);
+    stdin.emit('u');
     await nextTick();
 
     expect(runJestMock.mock.calls[0][0].globalConfig).toMatchObject({
@@ -652,8 +651,8 @@ describe('Watch mode flows', () => {
     const ci_watch = require('../watch').default;
     ci_watch(globalConfig, contexts, pipe, hasteMapInstances, stdin);
 
-    stdin.emit(KEYS.F);
-    stdin.emit(KEYS.W);
+    stdin.emit('f');
+    stdin.emit('w');
 
     const lastWatchDisplay = pipe.write.mock.calls.reverse()[0][0];
     expect(lastWatchDisplay).toMatch('Press a to run all tests.');
diff --git a/packages/jest-cli/src/__tests__/watch_filename_pattern_mode.test.js b/packages/jest-cli/src/__tests__/watch_filename_pattern_mode.test.js
index 8201e6b72427..81b4d1390634 100644
--- a/packages/jest-cli/src/__tests__/watch_filename_pattern_mode.test.js
+++ b/packages/jest-cli/src/__tests__/watch_filename_pattern_mode.test.js
@@ -9,12 +9,10 @@
 'use strict';
 
 import chalk from 'chalk';
-import {KEYS} from '../constants';
+import {KEYS} from 'jest-watch';
 
 const runJestMock = jest.fn();
 
-let terminalWidth;
-
 jest.mock('ansi-escapes', () => ({
   clearScreen: '[MOCK - clearScreen]',
   cursorDown: (count = 1) => `[MOCK - cursorDown(${count})]`,
@@ -79,10 +77,6 @@ jest.doMock(
     },
 );
 
-jest.doMock('../lib/terminal_utils', () => ({
-  getTerminalWidth: () => terminalWidth,
-}));
-
 const watch = require('../watch').default;
 
 const nextTick = () => new Promise(res => process.nextTick(res));
@@ -98,7 +92,6 @@ describe('Watch mode flows', () => {
   let stdin;
 
   beforeEach(() => {
-    terminalWidth = 80;
     pipe = {write: jest.fn()};
     hasteMapInstances = [{on: () => {}}];
     contexts = [{config: {}}];
@@ -110,7 +103,7 @@ describe('Watch mode flows', () => {
     watch(globalConfig, contexts, pipe, hasteMapInstances, stdin);
 
     // Write a enter pattern mode
-    stdin.emit(KEYS.P);
+    stdin.emit('p');
     expect(pipe.write).toBeCalledWith(' pattern › ');
 
     const assertPattern = hex => {
@@ -146,7 +139,7 @@ describe('Watch mode flows', () => {
     contexts[0].config = {rootDir: ''};
     watch(globalConfig, contexts, pipe, hasteMapInstances, stdin);
 
-    stdin.emit(KEYS.P);
+    stdin.emit('p');
     await nextTick();
 
     ['p', '.', '*', '1', '0']
@@ -154,18 +147,18 @@ describe('Watch mode flows', () => {
       .concat(KEYS.ENTER)
       .forEach(key => stdin.emit(key));
 
-    stdin.emit(KEYS.T);
+    stdin.emit('t');
     await nextTick();
 
     ['t', 'e', 's', 't'].concat(KEYS.ENTER).forEach(key => stdin.emit(key));
 
     await nextTick();
 
-    stdin.emit(KEYS.C);
+    stdin.emit('c');
     await nextTick();
 
     pipe.write.mockReset();
-    stdin.emit(KEYS.P);
+    stdin.emit('p');
     await nextTick();
 
     expect(pipe.write.mock.calls.join('\n')).toMatchSnapshot();
diff --git a/packages/jest-cli/src/__tests__/watch_test_name_pattern_mode.test.js b/packages/jest-cli/src/__tests__/watch_test_name_pattern_mode.test.js
index 376d89a4b4a0..1fd9fef0c827 100644
--- a/packages/jest-cli/src/__tests__/watch_test_name_pattern_mode.test.js
+++ b/packages/jest-cli/src/__tests__/watch_test_name_pattern_mode.test.js
@@ -9,12 +9,10 @@
 'use strict';
 
 import chalk from 'chalk';
-import {KEYS} from '../constants';
+import {KEYS} from 'jest-watch';
 
 const runJestMock = jest.fn();
 
-let terminalWidth;
-
 jest.mock('ansi-escapes', () => ({
   clearScreen: '[MOCK - clearScreen]',
   cursorDown: (count = 1) => `[MOCK - cursorDown(${count})]`,
@@ -93,10 +91,6 @@ jest.doMock(
     },
 );
 
-jest.doMock('../lib/terminal_utils', () => ({
-  getTerminalWidth: () => terminalWidth,
-}));
-
 const watch = require('../watch').default;
 
 const globalConfig = {
@@ -112,7 +106,6 @@ describe('Watch mode flows', () => {
   let stdin;
 
   beforeEach(() => {
-    terminalWidth = 80;
     pipe = {write: jest.fn()};
     hasteMapInstances = [{on: () => {}}];
     contexts = [{config: {}}];
@@ -124,7 +117,7 @@ describe('Watch mode flows', () => {
     watch(globalConfig, contexts, pipe, hasteMapInstances, stdin);
 
     // Write a enter pattern mode
-    stdin.emit(KEYS.T);
+    stdin.emit('t');
     expect(pipe.write).toBeCalledWith(' pattern › ');
 
     const assertPattern = hex => {
diff --git a/packages/jest-cli/src/constants.js b/packages/jest-cli/src/constants.js
index 2ceae57dc2b2..bdf2e5efdf85 100644
--- a/packages/jest-cli/src/constants.js
+++ b/packages/jest-cli/src/constants.js
@@ -11,33 +11,6 @@ const isWindows = process.platform === 'win32';
 
 export const CLEAR = isWindows ? '\x1B[2J\x1B[0f' : '\x1B[2J\x1B[3J\x1B[H';
 export const ARROW = ' \u203A ';
-export const KEYS = {
-  A: 'a',
-  ARROW_DOWN: '\u001b[B',
-  ARROW_LEFT: '\u001b[D',
-  ARROW_RIGHT: '\u001b[C',
-  ARROW_UP: '\u001b[A',
-  BACKSPACE: isWindows
-    ? Buffer.from('08', 'hex').toString()
-    : Buffer.from('7f', 'hex').toString(),
-  C: 'c',
-  CONTROL_C: '\u0003',
-  CONTROL_D: '\u0004',
-  ENTER: '\r',
-  ESCAPE: '\u001b',
-  F: 'f',
-  I: 'i',
-  O: 'o',
-  P: 'p',
-  Q: 'q',
-  QUESTION_MARK: '?',
-  R: 'r',
-  S: 's',
-  T: 't',
-  U: 'u',
-  W: 'w',
-};
-
 export const ICONS = {
   failed: isWindows ? '\u00D7' : '\u2715',
   pending: '\u25CB',
diff --git a/packages/jest-cli/src/lib/handle_deprecation_warnings.js b/packages/jest-cli/src/lib/handle_deprecation_warnings.js
index e07228b748af..1bedf32214c9 100644
--- a/packages/jest-cli/src/lib/handle_deprecation_warnings.js
+++ b/packages/jest-cli/src/lib/handle_deprecation_warnings.js
@@ -8,8 +8,7 @@
  */
 
 import chalk from 'chalk';
-
-import {KEYS} from '../constants';
+import {KEYS} from 'jest-watch';
 
 export default (
   pipe: stream$Writable | tty$WriteStream,
diff --git a/packages/jest-cli/src/plugins/quit.js b/packages/jest-cli/src/plugins/quit.js
index dfcbf8db2f9a..b8fcc7b013eb 100644
--- a/packages/jest-cli/src/plugins/quit.js
+++ b/packages/jest-cli/src/plugins/quit.js
@@ -6,7 +6,7 @@
  *
  * @flow
  */
-import BaseWatchPlugin from '../base_watch_plugin';
+import {BaseWatchPlugin} from 'jest-watch';
 
 class QuitPlugin extends BaseWatchPlugin {
   isInternal: true;
diff --git a/packages/jest-cli/src/plugins/test_name_pattern.js b/packages/jest-cli/src/plugins/test_name_pattern.js
index 4688ffa1ff58..2b6ea866e2e4 100644
--- a/packages/jest-cli/src/plugins/test_name_pattern.js
+++ b/packages/jest-cli/src/plugins/test_name_pattern.js
@@ -7,10 +7,9 @@
  * @flow
  */
 import type {GlobalConfig} from 'types/Config';
-import BaseWatchPlugin from '../base_watch_plugin';
+import {BaseWatchPlugin, Prompt} from 'jest-watch';
 import TestNamePatternPrompt from '../test_name_pattern_prompt';
 import activeFilters from '../lib/active_filters_message';
-import Prompt from '../lib/Prompt';
 
 class TestNamePatternPlugin extends BaseWatchPlugin {
   _prompt: Prompt;
diff --git a/packages/jest-cli/src/plugins/test_path_pattern.js b/packages/jest-cli/src/plugins/test_path_pattern.js
index 3de06b7edf55..ec5ed0390a1e 100644
--- a/packages/jest-cli/src/plugins/test_path_pattern.js
+++ b/packages/jest-cli/src/plugins/test_path_pattern.js
@@ -8,10 +8,9 @@
  */
 
 import type {GlobalConfig} from 'types/Config';
-import BaseWatchPlugin from '../base_watch_plugin';
+import {BaseWatchPlugin, Prompt} from 'jest-watch';
 import TestPathPatternPrompt from '../test_path_pattern_prompt';
 import activeFilters from '../lib/active_filters_message';
-import Prompt from '../lib/Prompt';
 
 class TestPathPatternPlugin extends BaseWatchPlugin {
   _prompt: Prompt;
diff --git a/packages/jest-cli/src/plugins/update_snapshots.js b/packages/jest-cli/src/plugins/update_snapshots.js
index 8f8d0a40425a..3b57b4f4cf48 100644
--- a/packages/jest-cli/src/plugins/update_snapshots.js
+++ b/packages/jest-cli/src/plugins/update_snapshots.js
@@ -7,8 +7,8 @@
  * @flow
  */
 import type {GlobalConfig} from 'types/Config';
-import BaseWatchPlugin from '../base_watch_plugin';
-import type {JestHookSubscriber} from '../jest_hooks';
+import type {JestHookSubscriber} from 'types/JestHooks';
+import {BaseWatchPlugin} from 'jest-watch';
 
 class UpdateSnapshotsPlugin extends BaseWatchPlugin {
   _hasSnapshotFailure: boolean;
diff --git a/packages/jest-cli/src/plugins/update_snapshots_interactive.js b/packages/jest-cli/src/plugins/update_snapshots_interactive.js
index c05da8a97465..22859fa41aad 100644
--- a/packages/jest-cli/src/plugins/update_snapshots_interactive.js
+++ b/packages/jest-cli/src/plugins/update_snapshots_interactive.js
@@ -6,10 +6,10 @@
  *
  * @flow
  */
-import type {JestHookSubscriber} from '../jest_hooks';
+import type {JestHookSubscriber} from 'types/JestHooks';
 import type {GlobalConfig} from 'types/Config';
 import type {AggregatedResult, AssertionLocation} from 'types/TestResult';
-import BaseWatchPlugin from '../base_watch_plugin';
+import {BaseWatchPlugin} from 'jest-watch';
 import SnapshotInteractiveMode from '../snapshot_interactive_mode';
 
 class UpdateSnapshotInteractivePlugin extends BaseWatchPlugin {
diff --git a/packages/jest-cli/src/run_jest.js b/packages/jest-cli/src/run_jest.js
index 3e076f81bcfa..59a28adff6db 100644
--- a/packages/jest-cli/src/run_jest.js
+++ b/packages/jest-cli/src/run_jest.js
@@ -11,6 +11,7 @@ import type {Context} from 'types/Context';
 import type {ChangedFilesPromise} from 'types/ChangedFiles';
 import type {GlobalConfig} from 'types/Config';
 import type {AggregatedResult} from 'types/TestResult';
+import type {JestHookEmitter} from 'types/JestHooks';
 import type TestWatcher from './test_watcher';
 
 import micromatch from 'micromatch';
@@ -25,7 +26,7 @@ import TestScheduler from './test_scheduler';
 import TestSequencer from './test_sequencer';
 import {makeEmptyAggregatedTestResult} from './test_result_helpers';
 import FailedTestsCache from './failed_tests_cache';
-import JestHooks, {type JestHookEmitter} from './jest_hooks';
+import {JestHook} from 'jest-watch';
 import collectNodeHandles from './get_node_handles';
 
 const setConfig = (contexts, newConfig) =>
@@ -115,7 +116,7 @@ export default (async function runJest({
   globalConfig,
   outputStream,
   testWatcher,
-  jestHooks = new JestHooks().getEmitter(),
+  jestHooks = new JestHook().getEmitter(),
   startRun,
   changedFilesPromise,
   onComplete,
diff --git a/packages/jest-cli/src/snapshot_interactive_mode.js b/packages/jest-cli/src/snapshot_interactive_mode.js
index a78336aa6d37..3c668209fdf0 100644
--- a/packages/jest-cli/src/snapshot_interactive_mode.js
+++ b/packages/jest-cli/src/snapshot_interactive_mode.js
@@ -10,10 +10,12 @@
 
 import type {AggregatedResult, AssertionLocation} from 'types/TestResult';
 
-const chalk = require('chalk');
-const ansiEscapes = require('ansi-escapes');
-const {pluralize} = require('./reporters/utils');
-const {KEYS, ARROW} = require('./constants');
+import chalk from 'chalk';
+import ansiEscapes from 'ansi-escapes';
+import {KEYS} from 'jest-watch';
+
+import {pluralize} from './reporters/utils';
+import {ARROW} from './constants';
 
 export default class SnapshotInteractiveMode {
   _pipe: stream$Writable | tty$WriteStream;
@@ -158,7 +160,7 @@ export default class SnapshotInteractiveMode {
 
   put(key: string) {
     switch (key) {
-      case KEYS.S:
+      case 's':
         if (this._skippedNum === this._testAssertions.length) break;
         this._skippedNum += 1;
 
@@ -171,14 +173,14 @@ export default class SnapshotInteractiveMode {
         }
 
         break;
-      case KEYS.U:
+      case 'u':
         this._run(true);
         break;
-      case KEYS.Q:
+      case 'q':
       case KEYS.ESCAPE:
         this.abort();
         break;
-      case KEYS.R:
+      case 'r':
         this.restart();
         break;
       case KEYS.ENTER:
diff --git a/packages/jest-cli/src/test_name_pattern_prompt.js b/packages/jest-cli/src/test_name_pattern_prompt.js
index 25ac22983cc5..47405f252dca 100644
--- a/packages/jest-cli/src/test_name_pattern_prompt.js
+++ b/packages/jest-cli/src/test_name_pattern_prompt.js
@@ -8,14 +8,14 @@
  */
 
 import type {TestResult} from 'types/TestResult';
-import type {ScrollOptions} from './lib/scroll_list';
+import type {ScrollOptions} from 'types/Watch';
 
-import Prompt from './lib/Prompt';
 import {
+  PatternPrompt,
+  Prompt,
   printPatternCaret,
   printRestoredPatternCaret,
-} from './lib/pattern_mode_helpers';
-import PatternPrompt from './pattern_prompt';
+} from 'jest-watch';
 
 export default class TestNamePatternPrompt extends PatternPrompt {
   _cachedTestResults: Array<TestResult>;
diff --git a/packages/jest-cli/src/test_path_pattern_prompt.js b/packages/jest-cli/src/test_path_pattern_prompt.js
index e0b532a65696..62516cf51b25 100644
--- a/packages/jest-cli/src/test_path_pattern_prompt.js
+++ b/packages/jest-cli/src/test_path_pattern_prompt.js
@@ -9,15 +9,15 @@
 
 import type {Context} from 'types/Context';
 import type {Test} from 'types/TestRunner';
-import type {ScrollOptions} from './lib/scroll_list';
+import type {ScrollOptions} from 'types/Watch';
 import type SearchSource from './search_source';
 
-import Prompt from './lib/Prompt';
 import {
+  PatternPrompt,
+  Prompt,
   printPatternCaret,
   printRestoredPatternCaret,
-} from './lib/pattern_mode_helpers';
-import PatternPrompt from './pattern_prompt';
+} from 'jest-watch';
 
 type SearchSources = Array<{|
   context: Context,
diff --git a/packages/jest-cli/src/types.js b/packages/jest-cli/src/types.js
index 664065b6c083..2a6c192458cc 100644
--- a/packages/jest-cli/src/types.js
+++ b/packages/jest-cli/src/types.js
@@ -7,7 +7,7 @@
  * @flow
  */
 import type {GlobalConfig} from 'types/Config';
-import type {JestHookSubscriber} from './jest_hooks';
+import type {JestHookSubscriber} from 'types/JestHooks';
 
 export type UsageData = {
   key: string,
diff --git a/packages/jest-cli/src/watch.js b/packages/jest-cli/src/watch.js
index 4279625deaf1..40177fdbacf4 100644
--- a/packages/jest-cli/src/watch.js
+++ b/packages/jest-cli/src/watch.js
@@ -26,8 +26,8 @@ import updateGlobalConfig from './lib/update_global_config';
 import SearchSource from './search_source';
 import TestWatcher from './test_watcher';
 import FailedTestsCache from './failed_tests_cache';
-import {KEYS, CLEAR} from './constants';
-import JestHooks from './jest_hooks';
+import {CLEAR} from './constants';
+import {KEYS, JestHook} from 'jest-watch';
 import TestPathPatternPlugin from './plugins/test_path_pattern';
 import TestNamePatternPlugin from './plugins/test_name_pattern';
 import UpdateSnapshotsPlugin from './plugins/update_snapshots';
@@ -55,7 +55,7 @@ export default function watch(
   outputStream: stream$Writable | tty$WriteStream,
   hasteMapInstances: Array<HasteMap>,
   stdin?: stream$Readable | tty$ReadStream = process.stdin,
-  hooks?: JestHooks = new JestHooks(),
+  hooks?: JestHook = new JestHook(),
 ): Promise<void> {
   // `globalConfig` will be constantly updated and reassigned as a result of
   // watch mode interactions.
@@ -263,9 +263,7 @@ export default function watch(
     if (
       isRunning &&
       testWatcher &&
-      [KEYS.Q, KEYS.ENTER, KEYS.A, KEYS.O, KEYS.F]
-        .concat(pluginKeys)
-        .indexOf(key) !== -1
+      !['q', KEYS.ENTER, 'a', 'o', 'f'].concat(pluginKeys).includes(key)
     ) {
       testWatcher.setState({interrupted: true});
       return;
@@ -306,7 +304,7 @@ export default function watch(
       case KEYS.ENTER:
         startRun(globalConfig);
         break;
-      case KEYS.A:
+      case 'a':
         globalConfig = updateGlobalConfig(globalConfig, {
           mode: 'watchAll',
           testNamePattern: '',
@@ -314,20 +312,20 @@ export default function watch(
         });
         startRun(globalConfig);
         break;
-      case KEYS.C:
+      case 'c':
         updateConfigAndRun({
           mode: 'watch',
           testNamePattern: '',
           testPathPattern: '',
         });
         break;
-      case KEYS.F:
+      case 'f':
         globalConfig = updateGlobalConfig(globalConfig, {
           onlyFailures: !globalConfig.onlyFailures,
         });
         startRun(globalConfig);
         break;
-      case KEYS.O:
+      case 'o':
         globalConfig = updateGlobalConfig(globalConfig, {
           mode: 'watch',
           testNamePattern: '',
@@ -335,9 +333,9 @@ export default function watch(
         });
         startRun(globalConfig);
         break;
-      case KEYS.QUESTION_MARK:
+      case '?':
         break;
-      case KEYS.W:
+      case 'w':
         if (!shouldDisplayWatchUsage && !isWatchUsageDisplayed) {
           outputStream.write(ansiEscapes.cursorUp());
           outputStream.write(ansiEscapes.eraseDown);
diff --git a/packages/jest-watch/.npmignore b/packages/jest-watch/.npmignore
new file mode 100644
index 000000000000..85e48fe7b0a4
--- /dev/null
+++ b/packages/jest-watch/.npmignore
@@ -0,0 +1,3 @@
+**/__mocks__/**
+**/__tests__/**
+src
diff --git a/packages/jest-watch/package.json b/packages/jest-watch/package.json
new file mode 100644
index 000000000000..8e11425a6feb
--- /dev/null
+++ b/packages/jest-watch/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "jest-watch",
+  "description": "Delightful JavaScript Testing.",
+  "version": "23.0.1",
+  "main": "build/index.js",
+  "dependencies": {
+    "ansi-escapes": "^3.0.0",
+    "chalk": "^2.0.1",
+    "string-length": "^2.0.0"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/facebook/jest"
+  },
+  "bugs": {
+    "url": "https://github.com/facebook/jest/issues"
+  },
+  "homepage": "http://facebook.github.io/jest/",
+  "license": "MIT"
+}
diff --git a/packages/jest-cli/src/base_watch_plugin.js b/packages/jest-watch/src/base_watch_plugin.js
similarity index 94%
rename from packages/jest-cli/src/base_watch_plugin.js
rename to packages/jest-watch/src/base_watch_plugin.js
index e19c43def1a7..b6af41c1830b 100644
--- a/packages/jest-cli/src/base_watch_plugin.js
+++ b/packages/jest-watch/src/base_watch_plugin.js
@@ -7,7 +7,7 @@
  * @flow
  */
 import type {GlobalConfig} from 'types/Config';
-import type {JestHookSubscriber} from './jest_hooks';
+import type {JestHookSubscriber} from 'types/JestHooks';
 import type {WatchPlugin, UsageData} from './types';
 
 class BaseWatchPlugin implements WatchPlugin {
diff --git a/packages/jest-watch/src/constants.js b/packages/jest-watch/src/constants.js
new file mode 100644
index 000000000000..dec73b46bf3a
--- /dev/null
+++ b/packages/jest-watch/src/constants.js
@@ -0,0 +1,22 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+const isWindows = process.platform === 'win32';
+
+export const KEYS = {
+  ARROW_DOWN: '\u001b[B',
+  ARROW_LEFT: '\u001b[D',
+  ARROW_RIGHT: '\u001b[C',
+  ARROW_UP: '\u001b[A',
+  BACKSPACE: Buffer.from(isWindows ? '08' : '7f', 'hex').toString(),
+  CONTROL_C: '\u0003',
+  CONTROL_D: '\u0004',
+  ENTER: '\r',
+  ESCAPE: '\u001b',
+};
diff --git a/packages/jest-watch/src/index.js b/packages/jest-watch/src/index.js
new file mode 100644
index 000000000000..fbe13be62b2c
--- /dev/null
+++ b/packages/jest-watch/src/index.js
@@ -0,0 +1,15 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+export {default as BaseWatchPlugin} from './base_watch_plugin';
+export {default as JestHook} from './jest_hooks';
+export {default as PatternPrompt} from './pattern_prompt';
+export * from './constants';
+export {default as Prompt} from './lib/Prompt';
+export * from './lib/pattern_mode_helpers';
diff --git a/packages/jest-cli/src/jest_hooks.js b/packages/jest-watch/src/jest_hooks.js
similarity index 68%
rename from packages/jest-cli/src/jest_hooks.js
rename to packages/jest-watch/src/jest_hooks.js
index 95eb335463fc..0d28f60ead83 100644
--- a/packages/jest-cli/src/jest_hooks.js
+++ b/packages/jest-watch/src/jest_hooks.js
@@ -7,33 +7,19 @@
  * @flow
  */
 
-import type {AggregatedResult} from 'types/TestResult';
-import type {ProjectConfig, Path} from 'types/Config';
+import type {
+  JestHookSubscriber,
+  JestHookEmitter,
+  FileChange,
+  ShouldRunTestSuite,
+  TestRunComplete,
+} from 'types/JestHooks';
 
-type JestHookExposedFS = {
-  projects: Array<{config: ProjectConfig, testPaths: Array<Path>}>,
-};
-
-type FileChange = (fs: JestHookExposedFS) => void;
-type ShouldRunTestSuite = (testPath: string) => Promise<boolean>;
-type TestRunComplete = (results: AggregatedResult) => void;
 type AvailableHooks =
   | 'onFileChange'
   | 'onTestRunComplete'
   | 'shouldRunTestSuite';
 
-export type JestHookSubscriber = {
-  onFileChange: (fn: FileChange) => void,
-  onTestRunComplete: (fn: TestRunComplete) => void,
-  shouldRunTestSuite: (fn: ShouldRunTestSuite) => void,
-};
-
-export type JestHookEmitter = {
-  onFileChange: (fs: JestHookExposedFS) => void,
-  onTestRunComplete: (results: AggregatedResult) => void,
-  shouldRunTestSuite: (testPath: string) => Promise<boolean>,
-};
-
 class JestHooks {
   _listeners: {
     onFileChange: Array<FileChange>,
diff --git a/packages/jest-cli/src/lib/Prompt.js b/packages/jest-watch/src/lib/Prompt.js
similarity index 97%
rename from packages/jest-cli/src/lib/Prompt.js
rename to packages/jest-watch/src/lib/Prompt.js
index cb49d3a1b585..16eebbe7fc9d 100644
--- a/packages/jest-cli/src/lib/Prompt.js
+++ b/packages/jest-watch/src/lib/Prompt.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import type {ScrollOptions} from './scroll_list';
+import type {ScrollOptions} from 'types/Watch';
 
 import {KEYS} from '../constants';
 
diff --git a/packages/jest-cli/src/lib/__tests__/__snapshots__/format_test_name_by_pattern.test.js.snap b/packages/jest-watch/src/lib/__tests__/__snapshots__/format_test_name_by_pattern.test.js.snap
similarity index 100%
rename from packages/jest-cli/src/lib/__tests__/__snapshots__/format_test_name_by_pattern.test.js.snap
rename to packages/jest-watch/src/lib/__tests__/__snapshots__/format_test_name_by_pattern.test.js.snap
diff --git a/packages/jest-cli/src/lib/__tests__/format_test_name_by_pattern.test.js b/packages/jest-watch/src/lib/__tests__/format_test_name_by_pattern.test.js
similarity index 100%
rename from packages/jest-cli/src/lib/__tests__/format_test_name_by_pattern.test.js
rename to packages/jest-watch/src/lib/__tests__/format_test_name_by_pattern.test.js
diff --git a/packages/jest-cli/src/lib/__tests__/prompt.test.js b/packages/jest-watch/src/lib/__tests__/prompt.test.js
similarity index 72%
rename from packages/jest-cli/src/lib/__tests__/prompt.test.js
rename to packages/jest-watch/src/lib/__tests__/prompt.test.js
index 62c7a5cf9220..9416d49a7dd4 100644
--- a/packages/jest-cli/src/lib/__tests__/prompt.test.js
+++ b/packages/jest-watch/src/lib/__tests__/prompt.test.js
@@ -11,11 +11,6 @@
 import Prompt from '../Prompt';
 import {KEYS} from '../../constants';
 
-const EXTRA_KEYS = Object.assign({}, KEYS, {
-  E: 'e',
-  S: 's',
-});
-
 it('calls handler on change value', () => {
   const options = {max: 10, offset: -1};
   const prompt = new Prompt();
@@ -25,16 +20,16 @@ it('calls handler on change value', () => {
 
   expect(onChange).toHaveBeenLastCalledWith('', options);
 
-  prompt.put(EXTRA_KEYS.T);
+  prompt.put('t');
   expect(onChange).toHaveBeenLastCalledWith('t', options);
 
-  prompt.put(EXTRA_KEYS.E);
+  prompt.put('e');
   expect(onChange).toHaveBeenLastCalledWith('te', options);
 
-  prompt.put(EXTRA_KEYS.S);
+  prompt.put('s');
   expect(onChange).toHaveBeenLastCalledWith('tes', options);
 
-  prompt.put(EXTRA_KEYS.T);
+  prompt.put('t');
   expect(onChange).toHaveBeenLastCalledWith('test', options);
 
   expect(onChange).toHaveBeenCalledTimes(5);
@@ -46,11 +41,11 @@ it('calls handler on success prompt', () => {
 
   prompt.enter(jest.fn(), onSuccess, jest.fn());
 
-  prompt.put(EXTRA_KEYS.T);
-  prompt.put(EXTRA_KEYS.E);
-  prompt.put(EXTRA_KEYS.S);
-  prompt.put(EXTRA_KEYS.T);
-  prompt.put(EXTRA_KEYS.ENTER);
+  prompt.put('t');
+  prompt.put('e');
+  prompt.put('s');
+  prompt.put('t');
+  prompt.put(KEYS.ENTER);
 
   expect(onSuccess).toHaveBeenCalledWith('test');
 });
@@ -61,11 +56,11 @@ it('calls handler on cancel prompt', () => {
 
   prompt.enter(jest.fn(), jest.fn(), onCancel);
 
-  prompt.put(EXTRA_KEYS.T);
-  prompt.put(EXTRA_KEYS.E);
-  prompt.put(EXTRA_KEYS.S);
-  prompt.put(EXTRA_KEYS.T);
-  prompt.put(EXTRA_KEYS.ESCAPE);
+  prompt.put('t');
+  prompt.put('e');
+  prompt.put('s');
+  prompt.put('t');
+  prompt.put(KEYS.ESCAPE);
 
   expect(onCancel).toHaveBeenCalled();
 });
diff --git a/packages/jest-cli/src/lib/__tests__/scroll_list.test.js b/packages/jest-watch/src/lib/__tests__/scroll_list.test.js
similarity index 100%
rename from packages/jest-cli/src/lib/__tests__/scroll_list.test.js
rename to packages/jest-watch/src/lib/__tests__/scroll_list.test.js
diff --git a/packages/jest-cli/src/lib/colorize.js b/packages/jest-watch/src/lib/colorize.js
similarity index 100%
rename from packages/jest-cli/src/lib/colorize.js
rename to packages/jest-watch/src/lib/colorize.js
diff --git a/packages/jest-cli/src/lib/format_test_name_by_pattern.js b/packages/jest-watch/src/lib/format_test_name_by_pattern.js
similarity index 100%
rename from packages/jest-cli/src/lib/format_test_name_by_pattern.js
rename to packages/jest-watch/src/lib/format_test_name_by_pattern.js
diff --git a/packages/jest-cli/src/lib/pattern_mode_helpers.js b/packages/jest-watch/src/lib/pattern_mode_helpers.js
similarity index 100%
rename from packages/jest-cli/src/lib/pattern_mode_helpers.js
rename to packages/jest-watch/src/lib/pattern_mode_helpers.js
diff --git a/packages/jest-cli/src/lib/scroll_list.js b/packages/jest-watch/src/lib/scroll_list.js
similarity index 90%
rename from packages/jest-cli/src/lib/scroll_list.js
rename to packages/jest-watch/src/lib/scroll_list.js
index 18f51163459a..913456206139 100644
--- a/packages/jest-cli/src/lib/scroll_list.js
+++ b/packages/jest-watch/src/lib/scroll_list.js
@@ -9,10 +9,7 @@
 
 'use strict';
 
-export type ScrollOptions = {
-  offset: number,
-  max: number,
-};
+import type {ScrollOptions} from 'types/Watch';
 
 export default function scroll(size: number, {offset, max}: ScrollOptions) {
   let start = 0;
diff --git a/packages/jest-cli/src/pattern_prompt.js b/packages/jest-watch/src/pattern_prompt.js
similarity index 96%
rename from packages/jest-cli/src/pattern_prompt.js
rename to packages/jest-watch/src/pattern_prompt.js
index ad3746aa7887..a25f602ca6ad 100644
--- a/packages/jest-cli/src/pattern_prompt.js
+++ b/packages/jest-watch/src/pattern_prompt.js
@@ -9,7 +9,7 @@
 
 'use strict';
 
-import type {ScrollOptions} from './lib/scroll_list';
+import type {ScrollOptions} from 'types/Watch';
 
 import chalk from 'chalk';
 import ansiEscapes from 'ansi-escapes';
diff --git a/packages/jest-watch/src/types.js b/packages/jest-watch/src/types.js
new file mode 100644
index 000000000000..2a6c192458cc
--- /dev/null
+++ b/packages/jest-watch/src/types.js
@@ -0,0 +1,26 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+import type {GlobalConfig} from 'types/Config';
+import type {JestHookSubscriber} from 'types/JestHooks';
+
+export type UsageData = {
+  key: string,
+  prompt: string,
+};
+
+export interface WatchPlugin {
+  +isInternal?: boolean;
+  +apply?: (hooks: JestHookSubscriber) => void;
+  +getUsageInfo?: (globalConfig: GlobalConfig) => ?UsageData;
+  +onKey?: (value: string) => void;
+  +run?: (
+    globalConfig: GlobalConfig,
+    updateConfigAndRun: Function,
+  ) => Promise<void | boolean>;
+}
diff --git a/types/JestHooks.js b/types/JestHooks.js
new file mode 100644
index 000000000000..3952d9518fe3
--- /dev/null
+++ b/types/JestHooks.js
@@ -0,0 +1,31 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+import type {AggregatedResult} from './TestResult';
+import type {Path, ProjectConfig} from './Config';
+
+export type JestHookExposedFS = {
+  projects: Array<{config: ProjectConfig, testPaths: Array<Path>}>,
+};
+
+export type FileChange = (fs: JestHookExposedFS) => void;
+export type ShouldRunTestSuite = (testPath: string) => Promise<boolean>;
+export type TestRunComplete = (results: AggregatedResult) => void;
+
+export type JestHookSubscriber = {
+  onFileChange: (fn: FileChange) => void,
+  onTestRunComplete: (fn: TestRunComplete) => void,
+  shouldRunTestSuite: (fn: ShouldRunTestSuite) => void,
+};
+
+export type JestHookEmitter = {
+  onFileChange: (fs: JestHookExposedFS) => void,
+  onTestRunComplete: (results: AggregatedResult) => void,
+  shouldRunTestSuite: (testPath: string) => Promise<boolean>,
+};
diff --git a/packages/jest-cli/src/lib/terminal_utils.js b/types/Watch.js
similarity index 71%
rename from packages/jest-cli/src/lib/terminal_utils.js
rename to types/Watch.js
index 70c38e3df4e4..91163d5b40c2 100644
--- a/packages/jest-cli/src/lib/terminal_utils.js
+++ b/types/Watch.js
@@ -7,5 +7,7 @@
  * @flow
  */
 
-/* $FlowFixMe */
-export const getTerminalWidth = (): nubmer => process.stdout.columns;
+export type ScrollOptions = {
+  offset: number,
+  max: number,
+};