feat: switch from nyc to c8 for native V8 coverage

Node.js supports writing coverage files since v10.12.  Use c8 to manage
creation and reporting of coverage information as nyc did for istanbul.

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>

README.md

@@ -10,7 +10,7 @@ Project Template
 A Node.js/npm project template with [codecov](https://codecov.io/),
 [coveralls](https://coveralls.io/), [ESLint](https://eslint.org/),
 [conventional-changelog](https://github.com/conventional-changelog/conventional-changelog/tree/master/packages/conventional-changelog-cli),
-[nyc](https://github.com/istanbuljs/nyc), [JSDoc](http://usejsdoc.org/), and
+[c8](https://github.com/bcoe/c8), [JSDoc](http://usejsdoc.org/), and
 [mocha](https://mochajs.org/).
 
 It is the template that I am using for my own Node.js projects, which

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@kevinoid/project-template",
   "version": "0.0.1",
-  "description": "A Node.js/npm project template with codecov, coveralls, ESLint, conventional-changelog, nyc, JSDoc, and mocha.",
+  "description": "A Node.js/npm project template with codecov, coveralls, ESLint, conventional-changelog, c8, JSDoc, and mocha.",
   "keywords": [
     "project-template",
     "template"
@@ -40,12 +40,12 @@
     "lint-js": "eslint --report-unused-disable-directives . && echo ESLint passed.",
     "postpublish": "git -C doc push && git push --follow-tags origin master gh-pages && echo Remember to update GitHub Releases from CHANGELOG.md",
     "postversion": "rimraf doc && git clone -b gh-pages -l -q . doc && npm run doc && git -C doc add . && git -C doc commit -n -m \"Docs for v$npm_package_version\"",
-    "preversion": "npm run test-cov && nyc check-coverage --statements 95 && depcheck --ignore-dirs doc && david && git-branch-is master && hub-ci-status -vv --wait",
+    "preversion": "npm run test-cov && c8 check-coverage --statements 95 && depcheck --ignore-dirs doc && david && git-branch-is master && hub-ci-status -vv --wait",
     "start": "supervisor --quiet --no-restart-on exit --extensions js,json --ignore test --poll-interval 2000 server.js",
     "test": "npm run lint && npm run test-unit",
     "test-cov": "npm run lint && npm run test-unit-cov",
     "test-unit": "node --throw-deprecation --unhandled-rejections=strict node_modules/mocha/bin/mocha --parallel --recursive test",
-    "test-unit-cov": "nyc --reporter=lcov --reporter=text npm run test-unit",
+    "test-unit-cov": "c8 --reporter=lcov --reporter=text npm run test-unit",
     "upload-cov": "codecov < ./coverage/lcov.info && coveralls < ./coverage/lcov.info",
     "version": "npm run changelog && echo && echo === Please edit CHANGELOG.md as desired, then exit === && echo && \"${npm_config_shell:-${SHELL:-bash}}\" && git commit -m \"Update CHANGELOG.md for $npm_package_version\" CHANGELOG.md",
     "version-deps": "npm install conventional-changelog-cli david depcheck git-branch-is hub-ci-status"
@@ -55,6 +55,7 @@
   },
   "devDependencies": {
     "@kevinoid/eslint-config": "^16.0.0",
+    "c8": "^7.0.0",
     "codecov": "^3.0.0",
     "coveralls": "^3.0.0",
     "eslint": "^7.3.0",
@@ -67,7 +68,6 @@
     "jsdoc": "^3.6.0",
     "mocha": "^8.3.0",
     "nodecat": "^2.0.0",
-    "nyc": "^15.0.0",
     "rimraf": "^3.0.0"
   },
   "engines": {