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Add spawnCallback option #44

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Add spawnCallback option #44

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7 changes: 7 additions & 0 deletions index.d.ts
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
import { ChildProcess } from 'child_process'
import { Readable, Transform } from 'stream'

/**
Expand Down Expand Up @@ -39,6 +40,12 @@ export interface LatexOptions {
* to.
*/
errorLogs?: string

/**
* A function to call on each LaTeX invocation. The only argument is an instance
* of ChildProcess.
*/
spawnCallback?: (proc: ChildProcess) => void
}

/**
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4 changes: 4 additions & 0 deletions index.js
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Expand Up @@ -162,6 +162,10 @@ function latex(src, options) {
const runLatex = (inputStream) => {
const tex = spawn(cmd, args, opts)

if (options.spawnCallback) {
options.spawnCallback(tex);
}

inputStream.pipe(tex.stdin)

// Prevent Node from crashing on compilation error.
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2 changes: 2 additions & 0 deletions readme.md
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Expand Up @@ -48,5 +48,7 @@ View more examples [here](https://github.com/saadq/node-latex/tree/master/exampl

**options.errorLogs** \[String] - The path to the file where you want to save the contents of the error log to.

**options.spawnCallback** \[Function] - A function to call on each LaTeX invocation. The only argument is an instance of `ChildProcess`.

## License
MIT