Drop Node.js < 10 support and update all devDependencies.

* sinon 8.x doesn't work with IE, so leave it at 7.x.

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: [6, 8, 12]
+        node: [10, 12]
         ruby: [2.4.x]
 
     steps:
@@ -60,7 +60,7 @@ jobs:
       - run: java -version
 
       - name: Install npm dependencies
-        run: npm install
+        run: npm ci
 
       - name: Install bundler dependencies
         run: bundle install --deployment --jobs=3 --retry=3 --clean
@@ -70,24 +70,24 @@ jobs:
 
       - name: Run bundlesize
         run: npm run bundlesize
-        if: matrix.node == 8
+        if: matrix.node == 10
         env:
           BUNDLESIZE_GITHUB_TOKEN: "${{ secrets.BUNDLESIZE_GITHUB_TOKEN }}"
 
       - name: Run BrowserStack tests
         run: npm run js-test-cloud
-        if: matrix.node == 8 && github.repository == 'twbs/bootstrap' && github.event_name == 'push'
+        if: matrix.node == 10 && github.repository == 'twbs/bootstrap' && github.event_name == 'push'
         env:
           BROWSER_STACK_ACCESS_KEY: "${{ secrets.BROWSER_STACK_ACCESS_KEY }}"
           BROWSER_STACK_USERNAME: "${{ secrets.BROWSER_STACK_USERNAME }}"
 
       - name: Run Link Checker
         run: npm run check-broken-links
-        if: matrix.node == 8
+        if: matrix.node == 10
 
       - name: Run Coveralls
         uses: coverallsapp/github-action@master
-        if: matrix.node == 8
+        if: matrix.node == 10
         with:
           github-token: "${{ secrets.GITHUB_TOKEN }}"
           path-to-lcov: "./js/coverage/lcov.info"

build/rollup.config.js

@@ -2,7 +2,7 @@
 
 const path    = require('path')
 const babel   = require('rollup-plugin-babel')
-const resolve = require('rollup-plugin-node-resolve')
+const resolve = require('@rollup/plugin-node-resolve')
 const banner  = require('./banner.js')
 
 const BUNDLE  = process.env.BUNDLE === 'true'

js/tests/integration/rollup.bundle.js

@@ -1,7 +1,7 @@
 /* eslint-env node */
 
-const resolve = require('rollup-plugin-node-resolve')
+const resolve = require('@rollup/plugin-node-resolve')
-const commonjs = require('rollup-plugin-commonjs')
+const commonjs = require('@rollup/plugin-commonjs')
 const babel = require('rollup-plugin-babel')
 
 module.exports = {

package.json

@@ -72,7 +72,7 @@
     "docs-lint": "node build/vnu-jar.js",
     "docs-serve": "bundle exec jekyll serve",
     "docs-serve-only": "npm run docs-serve -- --skip-initial-build --no-watch",
-    "update-deps": "ncu -u -x \"babel-plugin-istanbul,cross-env,eslint,find-unused-sass-variables,jquery,karma,karma-browserstack-launcher,karma-qunit,nodemon,postcss-cli,qunit,sinon,stylelint,stylelint-config-twbs-bootstrap\" && npm update && bundle update && cross-env-shell echo Manually update \\\"site/docs/$npm_package_version_short/assets/js/vendor/\\\"",
+    "update-deps": "ncu -u -x \"jquery,karma-browserstack-launcher,qunit,sinon\" && npm update && bundle update && cross-env-shell echo Manually update \\\"site/docs/$npm_package_version_short/assets/js/vendor/\\\"",
     "release": "npm-run-all dist release-sri release-zip docs-production",
     "release-sri": "node build/generate-sri.js",
     "release-version": "node build/change-version.js",
@@ -111,49 +111,46 @@
     "@babel/core": "^7.8.7",
     "@babel/plugin-proposal-object-rest-spread": "^7.8.3",
     "@babel/preset-env": "^7.8.7",
+    "@rollup/plugin-commonjs": "^11.0.2",
+    "@rollup/plugin-node-resolve": "^7.1.1",
     "autoprefixer": "^9.7.4",
     "babel-eslint": "^10.1.0",
-    "babel-plugin-istanbul": "^5.2.0",
+    "babel-plugin-istanbul": "^6.0.0",
     "broken-link-checker": "^0.7.8",
     "bundlesize": "^0.18.0",
     "clean-css-cli": "^4.3.0",
-    "cross-env": "^5.2.1",
+    "cross-env": "^7.0.2",
-    "eslint": "^5.16.0",
+    "eslint": "^6.8.0",
-    "find-unused-sass-variables": "^0.6.0",
+    "find-unused-sass-variables": "^1.0.5",
     "glob": "^7.1.6",
     "hammer-simulator": "0.0.1",
     "http-server": "^0.12.1",
     "ip": "^1.1.5",
     "jquery": "^3.4.1",
-    "karma": "^3.1.4",
+    "karma": "^4.4.1",
     "karma-browserstack-launcher": "1.4.0",
     "karma-chrome-launcher": "^3.1.0",
     "karma-coverage-istanbul-reporter": "^2.1.1",
     "karma-detect-browsers": "^2.3.3",
     "karma-firefox-launcher": "^1.3.0",
-    "karma-qunit": "^3.1.3",
+    "karma-qunit": "^4.0.0",
     "karma-sinon": "^1.0.5",
     "node-sass": "^4.13.1",
-    "nodemon": "^1.19.4",
+    "nodemon": "^2.0.2",
     "npm-run-all": "^4.1.5",
     "popper.js": "^1.16.0",
-    "postcss-cli": "^6.1.3",
+    "postcss-cli": "^7.1.0",
     "qunit": "2.9.2",
-    "rollup": "^1.32.1",
+    "rollup": "^2.0.2",
     "rollup-plugin-babel": "^4.4.0",
-    "rollup-plugin-commonjs": "^10.1.0",
-    "rollup-plugin-node-resolve": "^5.2.0",
     "shelljs": "^0.8.3",
     "shx": "^0.3.2",
     "sinon": "^7.5.0",
-    "stylelint": "^9.10.1",
+    "stylelint": "^13.2.1",
-    "stylelint-config-twbs-bootstrap": "^0.5.0",
+    "stylelint-config-twbs-bootstrap": "^2.0.1",
     "uglify-js": "^3.8.0",
     "vnu-jar": "20.2.28"
   },
-  "engines": {
-    "node": ">=6"
-  },
   "files": [
     "dist/{css,js}/*.{css,js,map}",
     "js/{src,dist}/**/*.{js,map}",