coverage: replace istanbul with nyc

* current istanbul coverage tests fail to run
* istanbul's last release was 8 years ago
* istanbul npm page recomments using nyc

README.md

@@ -1,7 +1,7 @@
 [PouchDB](https://pouchdb.com/) – The Database that Syncs!
 =========
 
-[![Build Status](https://github.com/pouchdb/pouchdb/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/pouchdb/pouchdb/actions/workflows/ci.yml?query=branch%3Amaster) [![Coverage Status](https://s3.amazonaws.com/assets.coveralls.io/badges/coveralls_100.svg)](https://coveralls.io/github/pouchdb/pouchdb?branch=master) [![Greenkeeper badge](https://badges.greenkeeper.io/pouchdb/pouchdb.svg)](https://greenkeeper.io/) [![npm version](https://img.shields.io/npm/v/pouchdb.svg)](https://www.npmjs.com/package/pouchdb) [![jsDelivr Hits](https://data.jsdelivr.com/v1/package/npm/pouchdb/badge?style=rounded)](https://www.jsdelivr.com/package/npm/pouchdb)
+[![Build Status](https://github.com/pouchdb/pouchdb/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/pouchdb/pouchdb/actions/workflows/ci.yml?query=branch%3Amaster) [![Greenkeeper badge](https://badges.greenkeeper.io/pouchdb/pouchdb.svg)](https://greenkeeper.io/) [![npm version](https://img.shields.io/npm/v/pouchdb.svg)](https://www.npmjs.com/package/pouchdb) [![jsDelivr Hits](https://data.jsdelivr.com/v1/package/npm/pouchdb/badge?style=rounded)](https://www.jsdelivr.com/package/npm/pouchdb)
 
 PouchDB is an open-source JavaScript database inspired by [Apache CouchDB](http://couchdb.apache.org/) that is designed to run well within the browser.
 

bin/test-node.sh

@@ -29,10 +29,6 @@ fi
 if [ $TYPE = "find" ]; then
     TESTS_PATH="tests/find/*/test.*.js"
 fi
-if [ "$COVERAGE" ]; then
-    # run all tests when testing for coverage
-    TESTS_PATH="tests/{unit,integration,mapreduce,component}/test*.js tests/find/*/test.*.js"
-fi
 
 if [ "$PERF" ]; then
     node tests/performance/index.js
@@ -47,8 +43,11 @@ elif [ ! "$COVERAGE" ]; then
         --grep="$GREP" \
         "$TESTS_PATH"
 else
+    # Ignore TESTS_PATH:
+    # run all tests when testing for coverage
+
     # --exit required to workaround #8839
-    ./node_modules/.bin/istanbul cover \
+    ./node_modules/.bin/nyc \
        --no-default-excludes -x 'tests/**' -x 'node_modules/**' \
        ./node_modules/mocha/bin/_mocha -- \
         --exit \
@@ -57,9 +56,9 @@ else
         --require=./tests/integration/node.setup.js \
         --reporter="$REPORTER" \
         --grep="$GREP" \
-        "$TESTS_PATH"
-
-    ./node_modules/.bin/istanbul check-coverage --line 100
+        'tests/{unit,integration,mapreduce,component}/test*.js' \
+        'tests/find/*/test.*.js'
+    ./node_modules/.bin/nyc check-coverage --line 100
 fi
 
 EXIT_STATUS=$?

package.json

@@ -25,7 +25,6 @@
     "build-site": "node ./bin/build-site.js",
     "test-coverage": "./bin/test-coverage.sh",
     "coverage": "COVERAGE=1 SERVER=pouchdb-server POUCHDB_SERVER_FLAGS=--in-memory PLUGINS=pouchdb-find ./bin/test-coverage.sh",
-    "report-coverage": "npm run test-coverage && istanbul-coveralls --no-rm",
     "build-test": "npm run build-test-utils && npm run build-perf",
     "build-test-utils": "browserify tests/integration/utils.js > tests/integration/utils-bundle.js",
     "build-perf": "browserify tests/performance/index.js > tests/performance-bundle.js",
@@ -78,15 +77,14 @@
     "glob": "7.1.5",
     "glob-watcher": "^6.0.0",
     "http-server": "0.12.3",
-    "istanbul": "0.4.5",
-    "istanbul-coveralls": "1.0.3",
     "less": "3.9.0",
     "lodash": "4.17.21",
     "marky": "1.2.5",
     "median": "0.0.2",
     "mkdirp": "0.5.1",
     "mocha": "10.2.0",
     "ncp": "2.0.0",
+    "nyc": "^15.1.0",
     "playwright": "1.42.1",
     "pouchdb-express-router": "0.0.11",
     "replace": "1.2.1",