krkarma777 · krkarma777 · Aug 31, 2026 · Aug 31, 2026
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -15,8 +15,9 @@ jobs:
           node-version: 24
       - run: npm ci
       - run: npm run typecheck
-      - run: npm test
+      - run: npm run test:coverage
       - run: npm run build
+      - run: npm run perf:smoke
       - uses: actions/upload-artifact@v4
         with:
           name: dist

diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -4,9 +4,12 @@ All notable changes to this project are documented in this file.
 The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and the project adheres to [Semantic Versioning](https://semver.org/).
 
-## [Unreleased]
+## [1.2.0] - 2026-08-31
 
 ### Added
+- Coverage gate in CI (c8, ~99% measured, floors enforced) and a
+  performance smoke check guarding the hot paths against gross
+  regressions. (#20)
 - `intl-word` and `grapheme` modes via `Intl.Segmenter` (with a `locale`
   option): locale-aware word diffs for unspaced scripts (Japanese, Chinese,
   Thai) and cluster-safe character diffs (ZWJ emoji, combining sequences).

diff --git a/README.md b/README.md
@@ -2,6 +2,7 @@
 
 [![npm version](https://img.shields.io/npm/v/%40krkarma777%2Fstring-diff)](https://www.npmjs.com/package/@krkarma777/string-diff)
 [![CI](https://img.shields.io/github/actions/workflow/status/krkarma777/string-diff/ci.yml?branch=master&label=CI)](https://github.com/krkarma777/string-diff/actions/workflows/ci.yml)
+[![coverage](https://img.shields.io/badge/coverage-99%25-brightgreen)](https://github.com/krkarma777/string-diff/actions/workflows/ci.yml)
 [![weekly downloads](https://img.shields.io/npm/dw/%40krkarma777%2Fstring-diff)](https://www.npmjs.com/package/@krkarma777/string-diff)
 [![total downloads](https://badgen.net/npm/dt/@krkarma777/string-diff?label=total%20downloads)](https://npm-stat.com/charts.html?package=%40krkarma777%2Fstring-diff)
 [![minzipped size](https://img.shields.io/badge/min%2Bgzip-2.9%20kB-blue)](#how-it-works)

diff --git a/coverage/tmp/coverage-16633-1788143345429-0.json b/coverage/tmp/coverage-16633-1788143345429-0.json
diff --git a/coverage/tmp/coverage-16634-1788143344987-0.json b/coverage/tmp/coverage-16634-1788143344987-0.json
diff --git a/coverage/tmp/coverage-16660-1788143345135-0.json b/coverage/tmp/coverage-16660-1788143345135-0.json
diff --git a/coverage/tmp/coverage-16661-1788143345416-0.json b/coverage/tmp/coverage-16661-1788143345416-0.json
diff --git a/coverage/tmp/coverage-16662-1788143345169-0.json b/coverage/tmp/coverage-16662-1788143345169-0.json
diff --git a/coverage/tmp/coverage-16663-1788143345168-0.json b/coverage/tmp/coverage-16663-1788143345168-0.json
diff --git a/coverage/tmp/coverage-16664-1788143345125-0.json b/coverage/tmp/coverage-16664-1788143345125-0.json
diff --git a/coverage/tmp/coverage-16665-1788143345177-0.json b/coverage/tmp/coverage-16665-1788143345177-0.json
diff --git a/coverage/tmp/coverage-16666-1788143345163-0.json b/coverage/tmp/coverage-16666-1788143345163-0.json
diff --git a/coverage/tmp/coverage-16667-1788143345169-0.json b/coverage/tmp/coverage-16667-1788143345169-0.json
diff --git a/coverage/tmp/coverage-16668-1788143345161-0.json b/coverage/tmp/coverage-16668-1788143345161-0.json
diff --git a/coverage/tmp/coverage-16669-1788143345131-0.json b/coverage/tmp/coverage-16669-1788143345131-0.json