add patch options to parseDiffFromFile

[BrianHung]

Description

Allows patch options to be passed to parseDiffFromFile. This comes from the upstream library (https://github.com/kpdecker/jsdiff), and are exposing that as an option to downstream consumers of this diffs lib.

Motivation & Context

I want to customize the context lines for grouping hunks. Default right now is 3. However, coming from CodeMirror, it uses context = 1 (https://github.com/codemirror/merge/blob/main/src/chunk.ts), so I would like this customizability for compatibility there.

Type of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would change existing functionality)
• Documentation update

Checklist

• I have read the
  contributing guidelines
• My code follows the code style of the project (bun run lint)
• My code is formatted properly (bun run format)
• I have updated the documentation accordingly (if applicable)
• I have added tests to cover my changes (if applicable)
• All new and existing tests pass (bun run diffs:test)

Related issues

[vercel]

@BrianHung is attempting to deploy a commit to the Pierre Computer Company Team on Vercel.

A member of the Team first needs to authorize it.

[amadeus]

lgtm, thanks for the contribution!

[vercel]

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Project	Deployment	Review	Updated (UTC)
pierrejs-diff-demo	Ready	Preview	Dec 29, 2025 8:42pm
pierrejs-docs	Ready	Preview	Dec 29, 2025 8:42pm
pierrejs-solid-diff-demo	Ready	Preview	Dec 29, 2025 8:42pm