Function diffPlainText

diffPlainText(
    sourceText: string,
    targetText: string,
    options?: HighlightOptions,
): DiffTextResult
Compare two plain-text strings and highlight the differences.

Performs a word-level diff between sourceText and targetText, returning highlighted HTML for both sides along with structured segment data. Unlike diffText, no HTML tags are stripped — both inputs are treated as plain text.
Parameters
- sourceText: string
  Plain text to treat as the source (unmatched words are highlighted).
- targetText: string
  Plain text to treat as the target (added words are highlighted).
- Optionaloptions: HighlightOptions
  Optional configuration for highlight tags and CSS classes.
Returns DiffTextResult
A DiffTextResult with highlighted HTML, segments, and similarity.
Example
```
import { diffPlainText } from "text-visual-diff";

const result = diffPlainText(
  "The quick brown fox",
  "The quick red fox",
);

// result.highlightedSource – "The quick <mark class="diff-unmatched">brown</mark> fox"
// result.highlightedTarget – "The quick <mark class="diff-added">red</mark> fox"
// result.similarity         – 0.78 (14/18 chars match)
```
- Defined in src/index.ts:144