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"readme": "# execa [](https://travis-ci.org/sindresorhus/execa) [](https://ci.appveyor.com/project/sindresorhus/execa/branch/master) [](https://coveralls.io/github/sindresorhus/execa?branch=master)\n\n> A better [`child_process`](https://nodejs.org/api/child_process.html)\n\n\n## Why\n\n- Promise interface.\n- [Strips EOF](https://github.com/sindresorhus/strip-eof) from the output so you don't have to `stdout.trim()`.\n- Supports [shebang](https://en.wikipedia.org/wiki/Shebang_(Unix)) binaries cross-platform.\n- [Improved Windows support.](https://github.com/IndigoUnited/node-cross-spawn#why)\n- Higher max buffer. 10 MB instead of 200 KB.\n- [Executes locally installed binaries by name.](#preferlocal)\n- [Cleans up spawned processes when the parent process dies.](#cleanup)\n\n\n## Install\n\n```\n$ npm install --save execa\n```\n\n\n## Usage\n\n```js\nconst execa = require('execa');\n\nexeca('echo', ['unicorns']).then(result => {\n\tconsole.log(result.stdout);\n\t//=> 'unicorns'\n});\n\n// pipe the child process stdout to the current stdout\nexeca('echo', ['unicorns']).stdout.pipe(process.stdout);\n\nexeca.shell('echo unicorns').then(result => {\n\tconsole.log(result.stdout);\n\t//=> 'unicorns'\n});\n\n// example of catching an error\nexeca.shell('exit 3').catch(error => {\n\tconsole.log(error);\n\t/*\n\t{\n\t\tmessage: 'Command failed: /bin/sh -c exit 3'\n\t\tkilled: false,\n\t\tcode: 3,\n\t\tsignal: null,\n\t\tcmd: '/bin/sh -c exit 3',\n\t\tstdout: '',\n\t\tstderr: '',\n\t\ttimedOut: false\n\t}\n\t*/\n});\n```\n\n\n## API\n\n### execa(file, [arguments], [options])\n\nExecute a file.\n\nThink of this as a mix of `child_process.execFile` and `child_process.spawn`.\n\nReturns a [`child_process` instance](https://nodejs.org/api/child_process.html#child_process_class_childprocess), which is enhanced to also be a `Promise` for a result `Object` with `stdout` and `stderr` properties.\n\n### execa.stdout(file, [arguments], [options])\n\nSame as `execa()`, but returns only `stdout`.\n\n### execa.stderr(file, [arguments], [options])\n\nSame as `execa()`, but returns only `stderr`.\n\n### execa.shell(command, [options])\n\nExecute a command through the system shell. Prefer `execa()` whenever possible, as it's both faster and safer.\n\nReturns a [`child_process` instance](https://nodejs.org/api/child_process.html#child_process_class_childprocess).\n\nThe `child_process` instance is enhanced to also be promise for a result object with `stdout` and `stderr` properties.\n\n### execa.sync(file, [arguments], [options])\n\nExecute a file synchronously.\n\nReturns the same result object as [`child_process.spawnSync`](https://nodejs.org/api/child_process.html#child_process_child_process_spawnsync_command_args_options).\n\nThis method throws an `Error` if the command fails.\n\n### execa.shellSync(file, [options])\n\nExecute a command synchronously through the system shell.\n\nReturns the same result object as [`child_process.spawnSync`](https://nodejs.org/api/child_process.html#child_process_child_process_spawnsync_command_args_options).\n\n### options\n\nType: `Object`\n\n#### cwd\n\nType: `string`
\nDefault: `process.cwd()`\n\nCurrent working directory of the child process.\n\n#### env\n\nType: `Object`
\nDefault: `process.env`\n\nEnvironment key-value pairs. Extends automatically from `process.env`. Set `extendEnv` to `false` if you don't want this.\n\n#### extendEnv\n\nType: `boolean`
\nDefault: `true`\n\nSet to `false` if you don't want to extend the environment variables when providing the `env` property.\n\n#### argv0\n\nType: `string`\n\nExplicitly set the value of `argv[0]` sent to the child process. This will be set to `command` or `file` if not specified.\n\n#### stdio\n\nType: `Array` `string`
\nDefault: `pipe`\n\nChild's [stdio](https://nodejs.org/api/child_process.html#child_process_options_stdio) configuration.\n\n#### detached\n\nType: `boolean`\n\nPrepare child to run independently of its parent process. Specific behavior [depends on the platform](https://nodejs.org/api/child_process.html#child_process_options_detached).\n\n#### uid\n\nType: `number`\n\nSets the user identity of the process.\n\n#### gid\n\nType: `number`\n\nSets the group identity of the process.\n\n#### shell\n\nType: `boolean` `string`
\nDefault: `false`\n\nIf `true`, runs `command` inside of a shell. Uses `/bin/sh` on UNIX and `cmd.exe` on Windows. A different shell can be specified as a string. The shell should understand the `-c` switch on UNIX or `/d /s /c` on Windows.\n\n#### stripEof\n\nType: `boolean`
\nDefault: `true`\n\n[Strip EOF](https://github.com/sindresorhus/strip-eof) (last newline) from the output.\n\n#### preferLocal\n\nType: `boolean`
\nDefault: `true`\n\nPrefer locally installed binaries when looking for a binary to execute.
\nIf you `$ npm install foo`, you can then `execa('foo')`.\n\n#### localDir\n\nType: `string`
\nDefault: `process.cwd()`\n\nPreferred path to find locally installed binaries in (use with `preferLocal`).\n\n#### input\n\nType: `string` `Buffer` `stream.Readable`\n\nWrite some input to the `stdin` of your binary.
\nStreams are not allowed when using the synchronous methods.\n\n#### reject\n\nType: `boolean`
\nDefault: `true`\n\nSetting this to `false` resolves the promise with the error instead of rejecting it.\n\n#### cleanup\n\nType: `boolean`
\nDefault: `true`\n\nKeep track of the spawned process and `kill` it when the parent process exits.\n\n#### encoding\n\nType: `string`
\nDefault: `utf8`\n\nSpecify the character encoding used to decode the `stdout` and `stderr` output.\n\n#### timeout\n\nType: `number`
\nDefault: `0`\n\nIf timeout is greater than `0`, the parent will send the signal identified by the `killSignal` property (the default is `SIGTERM`) if the child runs longer than timeout milliseconds.\n\n#### maxBuffer\n\nType: `number`
\nDefault: `10000000` (10MB)\n\nLargest amount of data in bytes allowed on `stdout` or `stderr`.\n\n#### killSignal\n\nType: `string` `number`
\nDefault: `SIGTERM`\n\nSignal value to be used when the spawned process will be killed.\n\n#### stdin\n\nType: `string` `number` `Stream` `undefined` `null`
\nDefault: `pipe`\n\nSame options as [`stdio`](https://nodejs.org/dist/latest-v6.x/docs/api/child_process.html#child_process_options_stdio).\n\n#### stdout\n\nType: `string` `number` `Stream` `undefined` `null`
\nDefault: `pipe`\n\nSame options as [`stdio`](https://nodejs.org/dist/latest-v6.x/docs/api/child_process.html#child_process_options_stdio).\n\n#### stderr\n\nType: `string` `number` `Stream` `undefined` `null`
\nDefault: `pipe`\n\nSame options as [`stdio`](https://nodejs.org/dist/latest-v6.x/docs/api/child_process.html#child_process_options_stdio).\n\n\n## Tips\n\n### Save and pipe output from a child process\n\nLet's say you want to show the output of a child process in real-time while also saving it to a variable.\n\n```js\nconst execa = require('execa');\nconst getStream = require('get-stream');\n\nconst stream = execa('echo', ['foo']).stdout;\n\nstream.pipe(process.stdout);\n\ngetStream(stream).then(value => {\n\tconsole.log('child output:', value);\n});\n```\n\n\n## License\n\nMIT © [Sindre Sorhus](https://sindresorhus.com)\n",
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