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34 lines
1.5 KiB
Markdown
34 lines
1.5 KiB
Markdown
spawn-error-forwarder [](https://travis-ci.org/bendrucker/spawn-error-forwarder)
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=====================
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Emit errors on stdout stream for a spawned child process. Useful for capturing errors from a spawned process when you want the output from stdout.
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## Setup
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```bash
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$ npm install spawn-error-forwarder
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```
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## API
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#### `fwd(child [, errFactory]` -> `child`
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Buffers `child.stderr` output. If the spawned process exits with a code `> 0`, the buffered output of `child.stderr` is used to generate an error which is emitted on `child.stdout`. By default, the error message is the output of `child.stderr`. If you provide an `errFactory` function, it will be called with `code, stderr` where `code` is the child's exit code and `stderr` is string that contains the output of `child.stderr`. `errFactory` should return an `Error` to be emitted on `child.stdout`.
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## Example
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```js
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var fwd = require('spawn-error-forwarder');
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var spawn = require('child_process').spawn;
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var child = spawn('git', ['log', 'non-existent-path']);
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fwd(child, function (code, stderr) {
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return new Error('git log exited with ' + code + ':\n\n' + stderr);
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});
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child.stdout
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.on('error', console.error.bind(console))
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.pipe(process.stdout);
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```
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We want to pipe the output of `git log` to `process.stdout` but since we're providing a path that doesn't exist git will exit with a non-zero code and we'll log its output with `console.error`.
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