├── .eslintrc.js ├── .github └── workflows │ └── build.yml ├── .gitignore ├── .nvmrc ├── .prettierrc ├── .vscode └── settings.json ├── CONTRIBUTING.md ├── LICENSE ├── PULL_REQUEST_TEMPLATE.md ├── README.md ├── jest.config.dist.js ├── jest.config.js ├── package.json ├── src ├── index.test.ts └── index.ts ├── tsconfig.json └── yarn.lock /.eslintrc.js: -------------------------------------------------------------------------------- 1 | module.exports = { 2 | "env": { 3 | "browser": true, 4 | "es6": true 5 | }, 6 | "extends": [ 7 | "eslint:recommended", 8 | "plugin:@typescript-eslint/eslint-recommended" 9 | ], 10 | "globals": { 11 | "Atomics": "readonly", 12 | "SharedArrayBuffer": "readonly" 13 | }, 14 | "parser": "@typescript-eslint/parser", 15 | "parserOptions": { 16 | "ecmaVersion": 2018, 17 | "sourceType": "module" 18 | }, 19 | "plugins": [ 20 | "@typescript-eslint" 21 | ], 22 | "rules": { 23 | "no-unused-vars": "off", 24 | "@typescript-eslint/no-unused-vars": "error" 25 | } 26 | }; 27 | -------------------------------------------------------------------------------- /.github/workflows/build.yml: -------------------------------------------------------------------------------- 1 | name: Build 2 | 3 | on: [push] 4 | 5 | jobs: 6 | build: 7 | runs-on: ubuntu-latest 8 | steps: 9 | - uses: actions/checkout@v2 10 | - uses: actions/setup-node@v1 11 | with: 12 | node-version: "10.x" 13 | - name: Install dependencies 14 | run: | 15 | yarn 16 | - name: Lint 17 | run: | 18 | yarn lint 19 | - name: Check formatting 20 | run: | 21 | yarn format:check 22 | - name: Compile TypeScript source 23 | run: | 24 | yarn build 25 | - name: Run tests 26 | run: | 27 | yarn test:dist 28 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | dist 2 | node_modules 3 | coverage 4 | .nyc_output 5 | .DS_Store 6 | yarn-error.log 7 | .npmrc 8 | -------------------------------------------------------------------------------- /.nvmrc: -------------------------------------------------------------------------------- 1 | v8.17.0 2 | -------------------------------------------------------------------------------- /.prettierrc: -------------------------------------------------------------------------------- 1 | { 2 | "trailingComma": "all", 3 | "tabWidth": 2, 4 | "endOfLine": "lf", 5 | "singleQuote": true 6 | } 7 | -------------------------------------------------------------------------------- /.vscode/settings.json: -------------------------------------------------------------------------------- 1 | { 2 | "typescript.tsdk": "node_modules/typescript/lib" 3 | } -------------------------------------------------------------------------------- /CONTRIBUTING.md: -------------------------------------------------------------------------------- 1 | # Contributing to Event-Dependent Promises 2 | 3 | Despite being primarily maintained by Peak, we welcome pull requests to this repo! We thank you for your time and efforts in making this library better 🙌🏻 4 | 5 | ## Consider raising an issue first if your proposed PR: 6 | 7 | * introduces breaking changes 8 | * changes a major version of a key dependency (this library must also work with our own internal stack!) 9 | 10 | ## Raising a pull request 11 | 12 | When you open a PR, the description will be prepopulated with our template. Please read the notes and add the requested details; **failure to do so will result in your PR being rejected**. 13 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /PULL_REQUEST_TEMPLATE.md: -------------------------------------------------------------------------------- 1 | 12 | 13 | ## Description 14 | 15 | TODO: replace this with a brief description of your changes 16 | 17 | ## Rationale 18 | 19 | TODO: explain _why_ you have made these changes 20 | 21 | ## Breaking changes 22 | 23 | Does your pull request include any breaking changes? 24 | 25 | - [ ] Yes 26 | - [ ] No 27 | 28 | If _yes_, please list these changes, and explain why they are necessary 29 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Event-Dependent Promises 2 | 3 | ![Build status](https://github.com/peak-ai/event-dependent-promises/workflows/Build/badge.svg) 4 | 5 | Proxy async methods to await prerequisite `EventEmitter` events: 6 | 7 | ```ts 8 | import eventDependentPromises from '@peak-ai/event-dependent-promises'; 9 | import sdk, { Data, Events } from 'some-third-party-eventemitter'; 10 | import { APIGatewayEvent } from 'aws-lambda'; 11 | 12 | const dependentSdk = eventDependentPromises( 13 | sdk, 14 | Events.READY, 15 | Events.INIT_TIMEOUT, 16 | { 17 | getData(key: string) { 18 | // sdk.getData returns Promise 19 | return sdk.getData(key); 20 | }, 21 | }, 22 | ); 23 | 24 | export const handler = (event: APIGatewayEvent): Promise => { 25 | const { body: key } = event; 26 | 27 | /* dependentSdk.getData(key) will invoke 28 | * and return sdk.getData(key) once the READY 29 | * event has been emitted or immediately 30 | * if it's been fired already. */ 31 | return dependentSdk.getData(key); 32 | }; 33 | ``` 34 | 35 | ## Why? 36 | 37 | If we wanted to, we could subscribe to our `EventEmitter` directly: 38 | 39 | ```ts 40 | import sdk, { Data, Events } from 'some-third-party-eventemitter'; 41 | import { APIGatewayEvent, Context, Callback } from 'aws-lambda'; 42 | import keyService from './key-service'; 43 | 44 | let hasSdkInitialised = false; 45 | 46 | export const handler = async (event: APIGatewayEvent, context: Context, cb: Callback): void => { 47 | const { body: id } = event; 48 | const key = await keyService.getForId(id); 49 | 50 | if (hasSdkInitialised) { 51 | const data = await sdk.getData(key); 52 | cb(null, data); 53 | return; 54 | } 55 | 56 | sdk.once(Events.READY, async () => { 57 | hasSdkInitialised = true; 58 | const data = await sdk.getData(key); 59 | cb(null, data); 60 | }); 61 | }; 62 | ``` 63 | 64 | There are some key drawbacks, however, that present themselves: 65 | 66 | * Mixing multiple async paradigms (`Promise`s _and_ callbacks!) 67 | * Having to manually track whether the `EventEmitter` (`sdk`) has already fired its initialisation event (required for warm lambda invocations) 68 | 69 | Event-Dependent Promises is directed at resolving (excuse the pun) these two issues by: 70 | 71 | * internally tracking when the prerequisite event has been emitted 72 | * proxying a set of methods to return `Promise`s, which won't resolve until the prerequisite event has been fired once 73 | 74 | Here's the previous example when using Event-Dependent Promises: 75 | 76 | ```ts 77 | import eventDependentPromises from '@peak-ai/event-dependent-promises'; 78 | import sdk, { Data, Events } from 'some-third-party-eventemitter'; 79 | import { APIGatewayEvent } from 'aws-lambda'; 80 | import keyService from './key-service'; 81 | 82 | const dependentSdk = eventDependentPromises( 83 | sdk, 84 | Events.READY, 85 | Events.INIT_TIMEOUT, 86 | { 87 | getData(key: string) { 88 | // sdk.getData returns Promise 89 | return sdk.getData(key); 90 | }, 91 | }, 92 | ); 93 | 94 | export const handler = async (event: APIGatewayEvent): Promise => { 95 | const { body: id } = event; 96 | const key = await keyService.getForId(id); 97 | 98 | /* Remember, dependentSdk.getData(key) 99 | * will wait for Events.READY to have 100 | * been emitted once before calling 101 | * and returning sdk.getData(key) */ 102 | return dependentSdk.getData(key); 103 | }; 104 | ``` 105 | 106 | ### Why this library instead of `events.once()`? 107 | 108 | * Internally tracks whether the required event has already been fired, in which case execution will continue; contrast this with `events.once()`, which will never resolve if the event has already occurred 109 | * Supports a custom rejection event (over simply rejecting on `'error'` being emitted) 110 | * Works with Node.js 10 111 | 112 | ## Getting started 113 | 114 | You can install Event-Dependent Promises from npm: 115 | 116 | ```sh 117 | npm i -E @peak-ai/event-dependent-promises 118 | ``` 119 | 120 | The library comprises of a single function, exposed via a `default` binding: 121 | 122 | ```ts 123 | import eventDependentPromises from '@peak-ai/event-dependent-promises'; 124 | ``` 125 | 126 | If you're using CommonJS, this means you'll have to destructure and rename the `default` binding: 127 | 128 | ```ts 129 | const { default: eventDependentPromises } = require('@peak-ai/event-dependent-promises'); 130 | ``` 131 | 132 | ## API 133 | 134 | ### `eventDependentPromises()` 135 | 136 | ```ts 137 | function eventDependentPromises( 138 | eventSource: TSource, 139 | successEvent: string, 140 | failureEvent: string, 141 | methods: TMethods, 142 | ): TMethods 143 | ``` 144 | 145 | #### Arguments 146 | 147 | * `eventSource`: any `EventEmitter` 148 | * `successEvent`: the name of the event that suggests successful initialisation 149 | * `failureEvent`: the name of the event that suggests unsuccessful initialisation. **If this is emitted**, then the `Promise`s returned by any of the `methods` **will reject** 150 | * `methods`: an object whose properties refer to async methods (i.e. returns a `Promise` or uses `async/await`) e.g: 151 | 152 | ```ts 153 | const methods = { 154 | fetchItems() { 155 | return window.fetch('/items'); 156 | }, 157 | }; 158 | ``` 159 | 160 | #### Returns 161 | 162 | `TMethods` 163 | 164 | This is, on the surface, the same object you passed for the `methods` argument. However, each method is augmented to await the required event emission if it hasn't already occured. 165 | 166 | ## Local development 167 | 168 | Prerequisites: 169 | 170 | * [Node Version Manager](https://github.com/nvm-sh/nvm) 171 | * [Yarn v1](https://yarnpkg.com/getting-started/install) 172 | 173 | 1. Fork this repo 174 | 2. `git clone ` 175 | 3. `cd event-dependent-promises` 176 | 4. `nvm i` 177 | 5. `yarn` 178 | 179 | You can then run: 180 | 181 | * `yarn lint`: runs ESLint against the source code 182 | * `yarn format`: fixes and overwrites any source files that _don't_ adhere to our Prettier config 183 | * `yarn format:check`: checks the formatting of our source files and fails if any don't adhere to said config, for CI and prepublish purposes 184 | * `yarn build`: runs the TypeScript compiler against the project and produces distributable output 185 | * `yarn test`: runs the unit tests 186 | * `yarn test:dist`: runs the compiled unit tests against the compiled source. Typically used by our pre-commit hook, CI, and pre-publish script 187 | 188 | ## Contributing 189 | 190 | Despite being primarily maintained by Peak, we welcome and appreciate any contributions from the community! Please see the [contribution guidelines](https://github.com/peak-ai/event-dependent-promises/blob/master/CONTRIBUTING.md) for more info. 191 | -------------------------------------------------------------------------------- /jest.config.dist.js: -------------------------------------------------------------------------------- 1 | 'use strict'; 2 | 3 | /* This config runs compiled tests against our compiled source 4 | * i.e. for our pre-commit hook, CI, and publish script. 5 | * As we run tsc to determine the syntactical validity 6 | * of our TypeScript source, as well as to build the output JS 7 | * for distribution. As we also compile the tests during this 8 | * phase, we can run them without the overhead of using the 9 | * ts-jest plugin, reducing overall execution time. */ 10 | 11 | // eslint-disable-next-line no-undef 12 | module.exports = { 13 | testEnvironment: 'node', 14 | testRegex: 'dist(/.*)?/.*.test.js$', 15 | }; 16 | -------------------------------------------------------------------------------- /jest.config.js: -------------------------------------------------------------------------------- 1 | 'use strict'; 2 | 3 | /* This config is for local development, using 4 | * ts-jest to avoid having to manually recompiling source 5 | * changes with tsc before re-running tests. This setup is 6 | * particularly useful for Jest's watch mode */ 7 | 8 | // eslint-disable-next-line no-undef 9 | module.exports = { 10 | transform: { 11 | '^.+\\.ts$': 'ts-jest', 12 | }, 13 | testEnvironment: 'node', 14 | testRegex: 'src(/.*)?/.*.test.ts$', 15 | moduleFileExtensions: ['ts', 'js', 'json'], 16 | globals: { 17 | 'ts-jest': { 18 | tsConfig: './tsconfig.json', 19 | diagnostics: false, 20 | }, 21 | }, 22 | }; 23 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "@peak-ai/event-dependent-promises", 3 | "version": "1.0.7", 4 | "description": "Proxy async methods to await prerequisite EventEmitter events", 5 | "main": "dist/index.js", 6 | "types": "dist/index.d.ts", 7 | "scripts": { 8 | "lint": "eslint jest.config*js 'src/**/*.ts'", 9 | "format": "prettier --write jest.config*js 'src/**/*.ts'", 10 | "format:check": "prettier --check jest.config*js 'src/**/*.ts'", 11 | "build": "tsc -p .", 12 | "preupdate": "yarn lint && yarn build && yarn test:dist", 13 | "prepublishOnly": "yarn format:check && yarn preupdate", 14 | "test": "jest", 15 | "test:dist": "jest --config jest.config.dist.js" 16 | }, 17 | "repository": { 18 | "type": "git", 19 | "url": "git+https://github.com/peak-ai/event-dependent-promises.git" 20 | }, 21 | "publishConfig": { 22 | "access": "public" 23 | }, 24 | "keywords": [ 25 | "promise", 26 | "async", 27 | "await", 28 | "eventemitter", 29 | "dependency" 30 | ], 31 | "author": "James Wright ", 32 | "license": "GPL-3.0-only", 33 | "bugs": { 34 | "url": "https://github.com/peak-ai/event-dependent-promises/issues" 35 | }, 36 | "engines": { 37 | "node": ">=8" 38 | }, 39 | "homepage": "https://github.com/peak-ai/event-dependent-promises#readme", 40 | "devDependencies": { 41 | "@types/jest": "24.9.0", 42 | "@types/node": "13.7.0", 43 | "@typescript-eslint/eslint-plugin": "2.19.0", 44 | "@typescript-eslint/parser": "2.19.0", 45 | "eslint": "6.8.0", 46 | "husky": "4.2.3", 47 | "jest": "24.9.0", 48 | "prettier": "1.19.1", 49 | "ts-jest": "24.1.0", 50 | "typescript": "3.7.5" 51 | }, 52 | "husky": { 53 | "hooks": { 54 | "pre-commit": "yarn format && yarn preupdate" 55 | } 56 | } 57 | } 58 | -------------------------------------------------------------------------------- /src/index.test.ts: -------------------------------------------------------------------------------- 1 | import eventDependentPromises from './'; 2 | import { EventEmitter } from 'events'; 3 | 4 | describe('eventDependentPromises', () => { 5 | const methods = { 6 | async getBar(prefix: string, suffix: string) { 7 | return `${prefix}bar${suffix}`; 8 | }, 9 | }; 10 | 11 | let source: EventEmitter; 12 | let augmented: typeof methods; 13 | 14 | beforeEach(() => { 15 | source = new EventEmitter(); 16 | augmented = eventDependentPromises(source, 'ready', 'error', methods); 17 | }); 18 | 19 | it('should await an EventEmitter event before resolving the requested Promise', async () => { 20 | process.nextTick(() => source.emit('ready')); 21 | 22 | const result = await augmented.getBar('Foo ', ' baz!'); 23 | 24 | expect(result).toBe('Foo bar baz!'); 25 | expect(source.listenerCount('ready')).toBe(0); 26 | expect(source.listenerCount('error')).toBe(0); 27 | }); 28 | 29 | it('should reject if the fail event is emitted', async () => { 30 | process.nextTick(() => source.emit('error')); 31 | 32 | await expect(augmented.getBar('Foo ', ' baz!')).rejects.toEqual( 33 | new Error(`Event Dependent: Failure event error was fired`), 34 | ); 35 | 36 | expect(source.listenerCount('ready')).toBe(0); 37 | expect(source.listenerCount('error')).toBe(0); 38 | }); 39 | 40 | it('should not subscribe to the event source if a successful emission has already occured', async () => { 41 | process.nextTick(() => source.emit('ready')); 42 | 43 | await augmented.getBar('Foo ', ' baz!'); 44 | await augmented.getBar('Foo ', ' baz!'); 45 | 46 | expect(source.listenerCount('ready')).toBe(0); 47 | expect(source.listenerCount('error')).toBe(0); 48 | }); 49 | }); 50 | -------------------------------------------------------------------------------- /src/index.ts: -------------------------------------------------------------------------------- 1 | import { EventEmitter } from 'events'; 2 | 3 | type Methods = { 4 | [name: string]: Function; 5 | }; 6 | 7 | const subscribe = ( 8 | eventSource: EventEmitter, 9 | successEvent: string, 10 | failureEvent: string, 11 | resolve: () => void, 12 | reject?: (e: Error) => void, 13 | ) => { 14 | /* We want to manually remove 15 | * any remaining events to which 16 | * we've subscribed to allow our 17 | * source to be garbage collected. */ 18 | const onSuccess = () => { 19 | eventSource.removeListener(failureEvent, onFailure); 20 | resolve(); 21 | }; 22 | 23 | const onFailure = () => { 24 | eventSource.removeListener(successEvent, onSuccess); 25 | 26 | if (reject) { 27 | reject( 28 | new Error(`Event Dependent: Failure event ${failureEvent} was fired`), 29 | ); 30 | } 31 | }; 32 | 33 | eventSource.once(successEvent, onSuccess); 34 | eventSource.once(failureEvent, onFailure); 35 | }; 36 | 37 | const event = ( 38 | eventSource: EventEmitter, 39 | successEvent: string, 40 | failureEvent: string, 41 | ) => 42 | new Promise((resolve, reject) => { 43 | subscribe(eventSource, successEvent, failureEvent, resolve, reject); 44 | }); 45 | 46 | const eventDependentPromises = < 47 | TSource extends EventEmitter, 48 | TMethods extends Methods 49 | >( 50 | eventSource: TSource, 51 | successEvent: string, 52 | failureEvent: string, 53 | methods: TMethods, 54 | ): TMethods => { 55 | let hasEmitted = false; 56 | 57 | /* Handles initial emission that 58 | * may occur during initialisaton */ 59 | subscribe(eventSource, successEvent, failureEvent, () => { 60 | hasEmitted = true; 61 | }); 62 | 63 | // Node 10 doesn't support Object.fromEntries :( 64 | return Object.entries(methods).reduce((proxies, [name, func]) => { 65 | proxies[name] = new Proxy(func, { 66 | async apply(target, context, args) { 67 | if (!hasEmitted) { 68 | await event(eventSource, successEvent, failureEvent); 69 | hasEmitted = true; 70 | } 71 | 72 | return await target(...args); 73 | }, 74 | }); 75 | 76 | return proxies; 77 | }, {}) as TMethods; 78 | }; 79 | 80 | export default eventDependentPromises; 81 | -------------------------------------------------------------------------------- /tsconfig.json: -------------------------------------------------------------------------------- 1 | { 2 | "include": ["src"], 3 | "compilerOptions": { 4 | "outDir": "dist", 5 | "strict": true, 6 | "moduleResolution": "node", 7 | "lib": ["es2020"], 8 | "target": "ES6", 9 | "module": "CommonJS", 10 | "removeComments": true, 11 | "declaration": true 12 | } 13 | } 14 | --------------------------------------------------------------------------------