motion
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motion - moving development forward
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"author": {
"name": "Tyler Kellen",
"url": "http://goingslowly.com/"
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"bugs": {
"url": "https://github.com/tkellen/node-flagged-respawn/issues"
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"dependencies": {},
"description": "A tool for respawning node binaries when special flags are present.",
"devDependencies": {
"chai": "~1.9.1",
"mocha": "~1.21.4",
"v8flags": "~1.0.1"
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"engines": {
"node": ">= 0.8.0"
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"homepage": "https://github.com/tkellen/node-flagged-respawn",
"keywords": [
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"type": "MIT",
"url": "https://github.com/tkellen/node-flagged-respawn/blob/master/LICENSE"
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"main": "index.js",
"name": "flagged-respawn",
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"readme": "# flagged-respawn [](http://travis-ci.org/tkellen/node-flagged-respawn)\n> A tool for respawning node binaries when special flags are present.\n\n[](https://nodei.co/npm/flagged-respawn/)\n\n## What is it?\n\nSay you wrote a command line tool that runs arbitrary javascript (e.g. task runner, test framework, etc). For the sake of discussion, let's pretend it's a testing harness you've named `testify`.\n\nEverything is going splendidly until one day you decide to test some code that relies on a feature behind a v8 flag in node (`--harmony`, for example). Without much thought, you run `testify --harmony spec tests.js`.\n\nIt doesn't work. After digging around for a bit, you realize this produces a [`process.argv`](http://nodejs.org/docs/latest/api/process.html#process_process_argv) of:\n\n`['node', '/usr/local/bin/test', '--harmony', 'spec', 'tests.js']`\n\nCrap. The `--harmony` flag is in the wrong place! It should be applied to the **node** command, not our binary. What we actually wanted was this:\n\n`['node', '--harmony', '/usr/local/bin/test', 'spec', 'tests.js']`\n\nFlagged-respawn fixes this problem and handles all the edge cases respawning creates, such as:\n- Providing a method to determine if a respawn is needed.\n- Piping stderr/stdout from the child into the parent.\n- Making the parent process exit with the same code as the child.\n- If the child is killed, making the parent exit with the same signal.\n\nTo see it in action, clone this repository and run `npm install` / `npm run respawn` / `npm run nospawn`.\n\n## Sample Usage\n\n```js\n#!/usr/bin/env node\n\nconst flaggedRespawn = require('flagged-respawn');\n\n// get a list of all possible v8 flags for the running version of node\nconst v8flags = require('v8flags').fetch();\n\nflaggedRespawn(v8flags, process.argv, function (ready, child) {\n if (ready) {\n console.log('Running!');\n // your cli code here\n } else {\n console.log('Special flags found, respawning.');\n }\n if (process.pid !== child.pid) {\n console.log('Respawned to PID:', child.pid);\n }\n});\n\n```\n\n## Release History\n\n* 2014-09-12 - v0.3.1 - use `{ stdio: 'inherit' }` for spawn to maintain colors\n* 2014-09-11 - v0.3.0 - for real this time\n* 2014-09-11 - v0.2.0 - cleanup\n* 2014-09-04 - v0.1.1 - initial release\n",
"readmeFilename": "README.md",
"repository": {
"type": "git",
"url": "git://github.com/tkellen/node-flagged-respawn.git"
},
"scripts": {
"nospawn": "node test/bin/respawner test",
"respawn": "node test/bin/respawner --harmony test",
"test": "mocha -R spec test"
},
"version": "0.3.1"
}