feat(core): Initial commit

.gitignore

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+coverage/
+node_modules/
+yarn.lock

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2019 Gustaf Räntilä
+
+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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+[![npm version][npm-image]][npm-url]
+[![downloads][downloads-image]][npm-url]
+[![build status][travis-image]][travis-url]
+[![coverage status][coverage-image]][coverage-url]
+[![greenkeeper badge][greenkeeper-image]][greenkeeper-url]
+[![Language grade: JavaScript][lgtm-image]][lgtm-url]
+
+# trace-unhandled
+
+Node.js warns on unhandled promise rejections. You might have seen:
+
+```
+(node:1234) UnhandledPromiseRejectionWarning
+```
+
+When this happens, it's not always obvious what promise is unhandled. The error displayed in the stack trace is the trace to the *error object construction*, not the construction of the promise which left it dangling. It might have travelled through various asynchronous chains before it got to an unhandled promise chain.
+
+`trace-unhandled` changes this. It keeps track of promises and when an *unhandled promise rejection* is logged, the location of both the error object **and** the promise is logged. This makes it a lot easier to find the bug.
+
+**This package is not intended to be used in production, only to aid spotting bugs**
+
+# API
+
+```ts
+require( 'trace-unhandled/register' ); // As early as possible
+```
+
+or if you want to allow some code to execute before you start tracing:
+
+```ts
+const { register } = require( 'trace-unhandled' );
+
+// ... whenever you want to start tracing
+register( );
+```
+
+
+[npm-image]: https://img.shields.io/npm/v/trace-unhandled.svg
+[npm-url]: https://npmjs.org/package/trace-unhandled
+[downloads-image]: https://img.shields.io/npm/dm/trace-unhandled.svg
+[travis-image]: https://img.shields.io/travis/grantila/trace-unhandled/master.svg
+[travis-url]: https://travis-ci.org/grantila/trace-unhandled
+[coverage-image]: https://coveralls.io/repos/github/grantila/trace-unhandled/badge.svg?branch=master
+[coverage-url]: https://coveralls.io/github/grantila/trace-unhandled?branch=master
+[greenkeeper-image]: https://badges.greenkeeper.io/grantila/trace-unhandled.svg
+[greenkeeper-url]: https://greenkeeper.io/
+[lgtm-image]: https://img.shields.io/lgtm/grade/javascript/g/grantila/trace-unhandled.svg?logo=lgtm&logoWidth=18
+[lgtm-url]: https://lgtm.com/projects/g/grantila/trace-unhandled/context:javascript