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Typer Diff

A lightweight TypeScript npm package for typed string comparison, designed for typing tests, education tools, and real-time text analytics.

TypeScriptTurborepoChangesetsGitHub Actions

Overview

Typer Diff provides a clean, dependency-free API for comparing user input against reference text and returning structured, type-safe diff results.

What was built

  • A core diff engine in TypeScript with zero runtime dependencies.
  • Strongly typed result models for downstream UI rendering and analytics logic.
  • A monorepo setup with docs app, tests, and automated release versioning.

Impact

  • Reached 3,000+ weekly npm downloads.
  • Enabled reusable integration in typing trainers and text-feedback products.
  • Kept package maintenance predictable through CI and Changesets workflows.

Usage

npm i typer-diff

import { diff } from "typer-diff"

const result = diff(referenceText, typedText)

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