Modernize the codebase

- Drop support for node 16
- Drop support for iife
- Drop support for legacy browsers
- Drop Bower
- No bundling
  - index.js should work out of the box for all modern use cases
  - maybe I’ll add a .min.js version at some point
- Update dependencies
- Make mathup an optional peer dependency
- Move test framwork to node --test
- Migrate to eslint 9
- Move from travis to github actions
- Add typescript annotations and export type declarations

Other Breaking Changes:

- Default delimiters are now `$` and `$$` for inline and block math
  respectively.
- Default renderer is now Mathup, which has a slightly different
  syntax and output.
- Passing options to the default mathup renderer has been renamed from
  `renderingOptions` to `defaultRendererOptions`.

Author: runarberg

.eslintrc

@@ -0,0 +1,85 @@
+name: ci
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+    types: [opened, synchronize, reopened]
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: lts/*
+          check-latest: true
+          cache: npm
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Check
+        run: npm run check
+
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: lts/*
+          check-latest: true
+          cache: npm
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Test
+        run: npm run test:coverage
+
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: lts/*
+          check-latest: true
+          cache: npm
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint
+
+  prettier:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: lts/*
+          check-latest: true
+          cache: npm
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Prettier
+        run: npm run prettier:ci

.github/workflows/ci.yml

@@ -0,0 +1,57 @@
+name: Coverage Badge
+
+on:
+  push:
+    branches: ["main"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: lts/*
+          check-latest: true
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build docs
+        run: npm run test:coverage-badge
+
+      - name: Upload static files as artifact
+        id: deployment
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: coverage/
+
+  deploy:
+    needs: build
+
+    runs-on: ubuntu-latest
+
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    steps:
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

.github/workflows/coverage-badge.yml

@@ -1,2 +1,4 @@
 node_modules/
-npm-debug.log
+npm-debug.log
+coverage/
+types/

.gitignore

@@ -1,2 +1,5 @@
+.github/
+**/*.test.js
+**/*.config.js
+coverage/
 test/
-.eslintrc