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`thenable-events` v2\nPowerful event-based system that introduces thenable objects to enable promise-like event handling\n\n#### Version 2 is here!\n* Improved compatibility with `thenable` definition in Promises/A+ spec\n* Introduction of Namespaced events\n* *Contributors: Introduction of proper `mocha` and `chai` tests*\n\n## Powerful Features\n\n* Dispatch events\n* Handle success and error events using promise-like syntax\n* Implements `thenables` compatible with Promises/A+ spec\n* Namespaced events work out of the box\n\n# Quick Start\n\nInstall:\n```shell\n$ yarn add thenable-events\n```\n\nUse:\n```javascript\nimport Dispatcher from 'thenable-events';\nconst EventDispatcher = new Dispatcher();\nEventDispatcher.when('eventName').then(val =\u003e console.log(val));\nEventDispatcher.resolve('eventName', 'Foobar!');\n// Console\u003e 'Foobar!'\n```\n\n## Usage Examples\n\n### Dispatching Events\n\nTraditional event-based systems combine the antiquated `callback` structure in order to handle events:\n\n```javascript\nmyObservable.on('eventName', () =\u003e console.log('Foobar!'));\n```\n\nWhile `thenable-events` employs a promise-like structure that is compatible with Promises/A+ implementations:\n\n```javascript\nimport Dispatcher from 'thenable-events';\nconst EventDispatcher = new Dispatcher();\nEventDispatcher.when('eventName').then(() =\u003e console.log('Foobar!'));\n```\n\n### Handling API Responses\n\nBecause of these improvements, we can use the power of chaining in a promise-like structure with event-based syntax where ***the chain is resolved every time an event is fired***.\n\nHere's an example using `axios` for an API call:\n\n```javascript\nimport axios from 'axios';\nimport Dispatcher from 'thenable-events';\n\nconst EventDispatcher = new Dispatcher();\n\nconst getData = () =\u003e\n\taxios.get('/svcs/myendpoint').then(\n\t\t(res) =\u003e {\n\t\t\tEventDispatcher.resolve('api.myendpoint', res.body);\n\t\t\treturn res;\n\t\t},\n\t\t(err) =\u003e {\n\t\t\tEventDispatcher.reject('api.myendpoint', err);\n\t\t\tthrow err;\n\t\t}\n\t);\n\n// ...\n\nEventDispatcher.when('api.myendpoint')\n\t.then(body =\u003e JSON.parse(body))\n\t.then(json =\u003e console.log({ json }))\n\t.catch(err =\u003e console.error(err));\n```\n\n### Support for Namespaced Event-Names\n\nSupport for namespaced event-names works out of the box, enabling handling of a wide-range of events within a single line:\n\n```javascript\nconst getData = () =\u003e\n\t// ...\n\t\tEventDispatcher.reject('api.myendpoint', err);\n\t// ...\n\n// Catches all rejected events under 'api.myendpoint.*'\nEventDispatcher.when('api.*')\n\t.catch(err =\u003e {\n\t\tconsole.error('Catch-all for All API Errors', err);\n\t});\n```\n\n## Concepts\n\nWith the promises becoming more ubiquitous due to their powerful structure, `thenable-events` employs `thenable` objects (as defined in Promises/A+) with interfaces very similar to Promises.\n\n### Promises/A+ Compatibility\n\nThe power of `thenable-events` is the similarity in the way that the `then` interface is implemented. The interface is entirely compatible with traditional Promise/A+ implementations. However, the real power comes from the ability to use promise-like syntax (thenable) within an event-based structure.\n\nSo what are the true differences?\n\nIt's quite simple, really:\n\n* `thenable-events` resolves each `then` chain every time an event is `resolved` or `rejected`\n\nThis is the only limitation with Promises being assimilated in a proper event-based architecture without the need for callbacks.\n\nThis issue is solved with `thenable-events`:\n\n#### Old versus New\n\n**Old**\n```javascript\nmyObservable.on('api.myendpoint', (data) =\u003e {\n\tlet json;\n\ttry {\n\t\tjson = JSON.parse(data);\n\t} catch(e) {\n\t\tconsole.error(err);\n\t\treturn;\n\t}\n\tconsole.log({ json });\n});\n```\n\n**New**\n```javascript\nEventDispatcher.when('api.myendpoint')\n    .then(body =\u003e JSON.parse(body))\n    .then(json =\u003e console.log({ json }))\n    .catch(err =\u003e console.error(err));\n```\n\n#### Test Suite Results\n\n```\nDispatcher\n  .when()\n\t✓ should throw an error if there are too many parameters\n\t✓ should be compatible with Promise.all\n\t✓ should be compatible with Promise.race\n\t.then( onFulfilled, onRejected )\n\t  ✓ should execute `onFulfilled` once if already resolved and once for every subsequent resolve\n\t  ✓ should execute `onRejected` once if thenable is already rejected and once for every subsequent reject\n\t  ✓ should accept other promises as return values for `thens`\n\t  ✓ should return properly chainable `thenables`\n\t  ✓ should throw an error if there are missing parameters\n\t  .catch()\n\t\t✓ should catch when a thenable is rejected within a then\n\t\t✓ should only fulfill catches\n\t.once( onFulfilled )\n\t  ✓ should only fulfill once\n\t  ✓ should fulfill when thenable is already resolved\n\t  ✓ should fulfill when a thenable is resolved later\n\t  ✓ should throw an error if there are missing parameters\n\t.catch()\n\t  ✓ should catch when a thenable is already rejected\n\t  ✓ should recover if catch returns a value\n\t  ✓ should only fulfill catches\n\t  ✓ should throw an error if there are missing parameters\n  .resolve\n\t✓ should resolve all 3 thens including those in lower namespaces, excluding those in higher namespaces\n\t✓ should not resolve absolute thens in lower namespaces\n  .reject\n\t✓ should reject all 3 catchs including those in lower namespaces, excluding those in higher namespaces\n\t✓ should not reject absolute catchs in lower namespaces\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fswivelgames%2Fthenable-events","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fswivelgames%2Fthenable-events","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fswivelgames%2Fthenable-events/lists"}