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This replaces the outdated rollup polyfill[1] by a 200 byte event emitter called mitt[2] that comes with a wildcard event matching. [1]: ionic-team/rollup-plugin-node-polyfills#8 [2]: https://github.com/developit/mitt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| /** | ||
| * Copyright 2020 Google Inc. All rights reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| import {EventEmitter} from './EventEmitter'; | ||
| import sinon from 'sinon'; | ||
| import {expect} from 'chai'; | ||
|
|
||
| describe('EventEmitter', () => { | ||
| type Events = { | ||
| foo: undefined; | ||
| bar: undefined; | ||
| }; | ||
| let emitter: EventEmitter<Events>; | ||
|
|
||
| beforeEach(() => { | ||
| emitter = new EventEmitter(); | ||
| }); | ||
|
|
||
| describe('on', () => { | ||
| const onTests = (methodName: 'on'): void => { | ||
| it(`${methodName}: adds an event listener that is fired when the event is emitted`, () => { | ||
| const listener = sinon.spy(); | ||
| emitter[methodName]('foo', listener); | ||
| emitter.emit('foo', undefined); | ||
| expect(listener.callCount).to.equal(1); | ||
| }); | ||
|
|
||
| it(`${methodName} sends the event data to the handler`, () => { | ||
| const listener = sinon.spy(); | ||
| const data = {}; | ||
| emitter[methodName]('foo', listener); | ||
| emitter.emit('foo', data); | ||
| expect(listener.callCount).to.equal(1); | ||
| expect(listener.firstCall.args[0]!).to.equal(data); | ||
| }); | ||
|
|
||
| it(`${methodName}: supports chaining`, () => { | ||
| const listener = sinon.spy(); | ||
| const returnValue = emitter[methodName]('foo', listener); | ||
| expect(returnValue).to.equal(emitter); | ||
| }); | ||
| }; | ||
| onTests('on'); | ||
| }); | ||
|
|
||
| describe('off', () => { | ||
| const offTests = (methodName: 'off'): void => { | ||
| it(`${methodName}: removes the listener so it is no longer called`, () => { | ||
| const listener = sinon.spy(); | ||
| emitter.on('foo', listener); | ||
| emitter.emit('foo', undefined); | ||
| expect(listener.callCount).to.equal(1); | ||
| emitter.off('foo', listener); | ||
| emitter.emit('foo', undefined); | ||
| expect(listener.callCount).to.equal(1); | ||
| }); | ||
|
|
||
| it(`${methodName}: supports chaining`, () => { | ||
| const listener = sinon.spy(); | ||
| emitter.on('foo', listener); | ||
| const returnValue = emitter.off('foo', listener); | ||
| expect(returnValue).to.equal(emitter); | ||
| }); | ||
| }; | ||
| offTests('off'); | ||
| }); | ||
|
|
||
| describe('once', () => { | ||
| it('only calls the listener once and then removes it', () => { | ||
| const listener = sinon.spy(); | ||
| emitter.once('foo', listener); | ||
| emitter.emit('foo', undefined); | ||
| expect(listener.callCount).to.equal(1); | ||
| emitter.emit('foo', undefined); | ||
| expect(listener.callCount).to.equal(1); | ||
| }); | ||
|
|
||
| it('supports chaining', () => { | ||
| const listener = sinon.spy(); | ||
| const returnValue = emitter.once('foo', listener); | ||
| expect(returnValue).to.equal(emitter); | ||
| }); | ||
| }); | ||
|
|
||
| describe('emit', () => { | ||
| it('calls all the listeners for an event', () => { | ||
| const listener1 = sinon.spy(); | ||
| const listener2 = sinon.spy(); | ||
| const listener3 = sinon.spy(); | ||
| emitter.on('foo', listener1).on('foo', listener2).on('bar', listener3); | ||
|
|
||
| emitter.emit('foo', undefined); | ||
|
|
||
| expect(listener1.callCount).to.equal(1); | ||
| expect(listener2.callCount).to.equal(1); | ||
| expect(listener3.callCount).to.equal(0); | ||
| }); | ||
|
|
||
| it('passes data through to the listener', () => { | ||
| const listener = sinon.spy(); | ||
| emitter.on('foo', listener); | ||
| const data = {}; | ||
|
|
||
| emitter.emit('foo', data); | ||
| expect(listener.callCount).to.equal(1); | ||
| expect(listener.firstCall.args[0]!).to.equal(data); | ||
| }); | ||
| }); | ||
| }); |
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