Modernize tooling, clean up repo, update copyright

* Update highlight.js from pre-2015 to v11.11.1
* Add package.json with bun lockfile for esbuild, highlight.js, TypeScript
* Add tsconfig.json for editor/LSP support with strict mode
* Add bin/setup script for one-command dev environment setup
* Split CI: test.yml, typecheck.yml (bun), gem_push.yml (Sigstore signing)
* Add npm ecosystem to dependabot.yml
* gemspec: opt-in file list, add metadata URIs, remove stale references
* Rewrite README with current setup and development instructions
* Update copyright to 2010-2026 Christoph Olszowka and Erik Berlin

Author: sferik

.document

@@ -17,3 +17,14 @@ updates:
         update-types:
           - minor
           - patch
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: daily
+    cooldown:
+      default-days: 7
+    groups:
+      minor-and-patch:
+        update-types:
+          - minor
+          - patch

.github/dependabot.yml

@@ -0,0 +1,37 @@
+name: Push gem to RubyGems
+
+on:
+  push:
+    tags:
+      - "v*"
+
+permissions:
+  contents: read
+
+jobs:
+  push:
+    if: github.repository == 'simplecov-ruby/simplecov-html'
+    runs-on: ubuntu-latest
+    environment:
+      name: rubygems.org
+      url: https://rubygems.org/gems/simplecov-html
+    permissions:
+      contents: write
+      id-token: write
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ruby
+          bundler-cache: true
+      - uses: rubygems/configure-rubygems-credentials@v1.0.0
+      - name: Update RubyGems
+        run: gem update --system
+      - name: Build gem
+        run: bundle exec rake build
+      - name: Sign gem with Sigstore
+        run: gem exec sigstore-cli sign pkg/*.gem --bundle pkg/simplecov-html.gem.sigstore.json
+      - name: Push gem
+        run: gem push pkg/*.gem --attestation pkg/simplecov-html.gem.sigstore.json
+      - name: Wait for release
+        run: gem exec rubygems-await pkg/*.gem

.github/workflows/gem_push.yml

@@ -0,0 +1,15 @@
+name: typecheck
+
+on: [push, pull_request]
+
+jobs:
+  typecheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: oven-sh/setup-bun@v2
+
+      - run: bun install
+
+      - run: bun run typecheck

.github/workflows/main.yml .github/workflows/test.yml.github/workflows/main.yml renamed to .github/workflows/test.yml

@@ -20,6 +20,9 @@ tmtags
 ## RUBYMINE
 .idea
 
+## NODE
+node_modules
+
 ## PROJECT::GENERAL
 coverage
 rdoc

.github/workflows/typecheck.yml

@@ -1,4 +1,4 @@
-Copyright (c) 2010-2013 Christoph Olszowka
+Copyright (c) 2010-2026 Christoph Olszowka and Erik Berlin
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

.gitignore

@@ -3,28 +3,39 @@ Default HTML formatter for SimpleCov
 
 ***Note: To learn more about SimpleCov, check out the main repo at https://github.com/simplecov-ruby/simplecov***
 
-Generates a nice HTML report of your SimpleCov ruby code coverage results on Ruby 2.4+ using client-side Javascript
-quite extensively.
+Generates an HTML report of your SimpleCov Ruby code coverage results with interactive sorting, filtering, and syntax-highlighted source views.
 
+Setup
+-----
 
-Note on Patches/Pull Requests
------------------------------
+```bash
+bin/setup
+```
 
-The formatter itself has no actual tests. Instead, it is tested in the cucumber features of simplecov itself. If you
-modify the formatter, please make sure the simplecov test suites still pass by doing the following:
+This installs both Ruby and Node dependencies. Node dependencies (esbuild, TypeScript, highlight.js) are only needed for development.
 
-  * Clone simplecov into the parent directory of your simplecov-html checkout
-  * `cd` there, run `bundle`
-  * You should end up with all dev dependencies installed and simplecov-html being used from your disk
-  * Run the tests (units and features)
+Development
+-----------
 
-Please remember to add tests if you add functionality.
+Run the test suite:
 
-**Important:** If you modify the JS/CSS assets, you'll have to precompile them using `rake assets:compile` - otherwise,
-your changes will not be included in your coverage reports.
+```bash
+bundle exec rake
+```
 
+If you modify the TypeScript or CSS assets, recompile them:
+
+```bash
+bundle exec rake assets:compile
+```
+
+Type-check the TypeScript:
+
+```bash
+bun run typecheck
+```
 
 Copyright
 ---------
 
-Copyright (c) 2010-2013 Christoph Olszowka. See LICENSE for details.
+Copyright (c) 2010-2026 Christoph Olszowka and Erik Berlin. See LICENSE for details.