Version 1.0.0

.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# next.js build output
+.next
+
+# ignore the distribution folder
+dist/

.npmignore

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+# All
+*
+
+# But not
+!dist/**

LICENSE

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+MIT License
+
+Copyright (c) 2018 Olivia Trewin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# event-filter
+
+A package for filtering Node.js events. Your listeners only get executed when the specified predicate is satisfied.
+
+## Usage
+
+```js
+import { EventEmitter } from 'event'
+import 'event-filter'
+
+const event = new EventEmitter()
+event.onWhen('someEvent', (...) => /* predicate */, (...) => /* normal listener */)
+event.onceWhen('someEvent', (...) => /* predicate */, (...) => /* normal listener */)
+```
+
+`event-filter` adds the following methods to the `EventEmitter` prototype:
+
+Method Name |   Description
+----------- |   -----------
+`onWhen (event: string | symbol, predicate: (...args: any[]) => boolean, listener (...args: any[]) => void): void`      |   Subscribe to the specified event, but only call the listener when the predicate is satisfied.
+`onceWhen (event: string | symbol, predicate: (...args: any[]) => boolean, listener (...args: any[]) => void): void`    |   Subscribe to the specified event, calling the listener the first time the predicate is satisfied.
+
+`event-filter` contains defines TypeScript definitions for type safety.
+
+`event-filter` adds JSDoc comments to both new methods.
+
+## Building
+
+To build, install all devDependencies and execute `npm run build`.
+
+To build with a watch, execute `npm run watch:build`.
+
+## Testing
+
+To test, install all devDependencies and execute `npm run test`.