feat(deps): replace cover/istanbul with nyc (#1823)

`istanbul` is not supported anymore, and the last version of `cover` was
released seven years ago. `cover` also depends on a vulnerable package
(which makes `npm audit` noisy). Since `make cover` was not working
anymore, replacing it with `nyc` (`istanbul`'s successor) should be
straightforward.

Signed-off-by: Matheus Marchini <mmarchini@netflix.com>

.gitignore

@@ -1,5 +1,3 @@
-.coverage_data
-cover_html
 node_modules
 docs/*.html
 docs/pkg
@@ -14,3 +12,6 @@ deps/javascriptlint
 deps/jsstyle
 package-lock.json
 benchmark/results
+.nyc_output/
+coverage/
+cover_html/

Makefile

@@ -21,7 +21,7 @@ ESLINT		:= ./node_modules/.bin/eslint
 DOCUMENTATION		:= ./node_modules/.bin/documentation
 NODEUNIT	:= ./node_modules/.bin/nodeunit
 MOCHA		:= ./node_modules/.bin/mocha
-NODECOVER	:= ./node_modules/.bin/cover
+NODECOVER	:= ./node_modules/.bin/nyc
 DOCS_BUILD	:= ./tools/docsBuild.js
 NPM		:= npm
 NODE		:= node
@@ -52,8 +52,7 @@ $(NODECOVER): | $(NPM_EXEC)
 .PHONY: cover
 cover: $(NODECOVER)
 	@rm -fr ./.coverage_data
-	$(NODECOVER) run $(NODEUNIT) ./test/*.js
-	$(NODECOVER) report html
+	$(NODECOVER) --reporter=html --reporter=text-summary --reporter=lcov $(NODEUNIT) ./test/*.js
 
 CLEAN_FILES += $(TAP) ./node_modules/nodeunit
 

package.json

@@ -122,7 +122,6 @@
     "autocannon": "^4.0.0",
     "autocannon-compare": "^0.4.0",
     "chai": "^4.2.0",
-    "cover": "^0.2.9",
     "coveralls": "^3.0.3",
     "documentation": "^11.0.0",
     "eslint": "^5.16.0",
@@ -131,10 +130,10 @@
     "eslint-plugin-prettier": "^3.1.0",
     "glob": "^7.1.4",
     "inquirer": "^3.3.0",
-    "istanbul": "^0.4.5",
     "mkdirp": "^0.5.1",
     "mocha": "^7.1.1",
     "nodeunit": "^0.11.3",
+    "nyc": "^15.0.0",
     "ora": "^1.3.0",
     "pre-commit": "^1.2.2",
     "prettier": "^1.17.1",