diff --git a/package-lock.json b/package-lock.json
index 33d4dfe3..8e697ec8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -22,7 +22,6 @@
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         "mocha": "^8.3.0"
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@@ -157,54 +156,6 @@
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@@ -221,294 +172,6 @@
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@@ -819,6 +482,15 @@
         }
       }
     },
+    "node_modules/@tootallnate/once": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-1.1.2.tgz",
+      "integrity": "sha512-RbzJvlNzmRq5c3O09UipeuXno4tA1FE6ikOjxZK0tuxVv3412l64l5t1W5pj4+rJq9vpkm/kwiR07aZXnsKPxw==",
+      "dev": true,
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/@tootallnate/quickjs-emscripten": {
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@@ -1644,6 +1316,41 @@
         "node": ">= 0.6"
       }
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+    "node_modules/agent-base": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.2.tgz",
+      "integrity": "sha512-RZNwNclF7+MS/8bDg70amg32dyeZGZxiDuQmZxKLAlQjr3jGyLx+4Kkk58UO7D2QdgFIQCovuSuZESne6RG6XQ==",
+      "dev": true,
+      "dependencies": {
+        "debug": "4"
+      },
+      "engines": {
+        "node": ">= 6.0.0"
+      }
+    },
+    "node_modules/agent-base/node_modules/debug": {
+      "version": "4.3.4",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+      "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
+      "dev": true,
+      "dependencies": {
+        "ms": "2.1.2"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/agent-base/node_modules/ms": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+      "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
@@ -1736,6 +1443,15 @@
         "sprintf-js": "~1.0.2"
       }
     },
+    "node_modules/argv": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/argv/-/argv-0.0.2.tgz",
+      "integrity": "sha512-dEamhpPEwRUBpLNHeuCm/v+g0anFByHahxodVO/BbAarHVBBg2MccCwf9K+o1Pof+2btdnkJelYVUWjW/VrATw==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.6.10"
+      }
+    },
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@@ -2143,6 +1859,26 @@
         "type-is": "^1.6.16"
       }
     },
+    "node_modules/codecov": {
+      "version": "3.8.3",
+      "resolved": "https://registry.npmjs.org/codecov/-/codecov-3.8.3.tgz",
+      "integrity": "sha512-Y8Hw+V3HgR7V71xWH2vQ9lyS358CbGCldWlJFR0JirqoGtOoas3R3/OclRTvgUYFK29mmJICDPauVKmpqbwhOA==",
+      "deprecated": "https://about.codecov.io/blog/codecov-uploader-deprecation-plan/",
+      "dev": true,
+      "dependencies": {
+        "argv": "0.0.2",
+        "ignore-walk": "3.0.4",
+        "js-yaml": "3.14.1",
+        "teeny-request": "7.1.1",
+        "urlgrey": "1.0.0"
+      },
+      "bin": {
+        "codecov": "bin/codecov"
+      },
+      "engines": {
+        "node": ">=4.0"
+      }
+    },
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       "dev": true
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+    "node_modules/fast-url-parser": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/fast-url-parser/-/fast-url-parser-1.1.3.tgz",
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+      "dev": true,
+      "dependencies": {
+        "punycode": "^1.3.2"
+      }
+    },
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       "resolved": "https://registry.npmjs.org/fastq/-/fastq-1.15.0.tgz",
@@ -3125,6 +2870,79 @@
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       }
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+    "node_modules/http-proxy-agent": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/http-proxy-agent/-/http-proxy-agent-4.0.1.tgz",
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+      "dev": true,
+      "dependencies": {
+        "@tootallnate/once": "1",
+        "agent-base": "6",
+        "debug": "4"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/http-proxy-agent/node_modules/debug": {
+      "version": "4.3.4",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
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+      "dev": true,
+      "dependencies": {
+        "ms": "2.1.2"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
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+    },
+    "node_modules/http-proxy-agent/node_modules/ms": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
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+      "dev": true
+    },
+    "node_modules/https-proxy-agent": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-5.0.1.tgz",
+      "integrity": "sha512-dFcAjpTQFgoLMzC2VwU+C/CbS7uRL0lWmxDITmqm7C+7F0Odmj6s9l6alZc6AELXhrnggM2CeWSXHGOdX2YtwA==",
+      "dev": true,
+      "dependencies": {
+        "agent-base": "6",
+        "debug": "4"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/https-proxy-agent/node_modules/debug": {
+      "version": "4.3.4",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+      "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
+      "dev": true,
+      "dependencies": {
+        "ms": "2.1.2"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/https-proxy-agent/node_modules/ms": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+      "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+      "dev": true
+    },
     "node_modules/iconv-lite": {
       "version": "0.4.24",
       "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
@@ -3166,6 +2984,15 @@
         "node": ">= 4"
       }
     },
+    "node_modules/ignore-walk": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/ignore-walk/-/ignore-walk-3.0.4.tgz",
+      "integrity": "sha512-PY6Ii8o1jMRA1z4F2hRkH/xN59ox43DavKvD3oDpfurRlOJyAHpifIwpbdv1n4jt4ov0jSpw3kQ4GhJnpBL6WQ==",
+      "dev": true,
+      "dependencies": {
+        "minimatch": "^3.0.4"
+      }
+    },
     "node_modules/inflation": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/inflation/-/inflation-2.1.0.tgz",
@@ -4758,6 +4585,12 @@
         "once": "^1.3.1"
       }
     },
+    "node_modules/punycode": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
+      "integrity": "sha512-jmYNElW7yvO7TV33CjSmvSiE2yco3bV2czu/OzDKdMNVZQWfxCblURLhf+47syQRBntjfLdd/H0egrzIG+oaFQ==",
+      "dev": true
+    },
     "node_modules/qs": {
       "version": "6.11.0",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.11.0.tgz",
@@ -5180,6 +5013,15 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/stream-events": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/stream-events/-/stream-events-1.0.5.tgz",
+      "integrity": "sha512-E1GUzBSgvct8Jsb3v2X15pjzN1tYebtbLaMg+eBOUOAxgbLoSbT2NS91ckc5lJD1KfLjId+jXJRgo0qnV5Nerg==",
+      "dev": true,
+      "dependencies": {
+        "stubs": "^3.0.0"
+      }
+    },
     "node_modules/stream-read-all": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/stream-read-all/-/stream-read-all-3.0.1.tgz",
@@ -5257,6 +5099,12 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/stubs": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/stubs/-/stubs-3.0.0.tgz",
+      "integrity": "sha512-PdHt7hHUJKxvTCgbKX9C1V/ftOcjJQgz8BZwNfV5c4B6dcGqlpelTbJ999jBGZ2jYiPAwcX5dP6oBwVlBlUbxw==",
+      "dev": true
+    },
     "node_modules/supports-color": {
       "version": "3.2.3",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-3.2.3.tgz",
@@ -5320,6 +5168,22 @@
         "node": ">=12.17"
       }
     },
+    "node_modules/teeny-request": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/teeny-request/-/teeny-request-7.1.1.tgz",
+      "integrity": "sha512-iwY6rkW5DDGq8hE2YgNQlKbptYpY5Nn2xecjQiNjOXWbKzPGUfmeUBCSQbbr306d7Z7U2N0TPl+/SwYRfua1Dg==",
+      "dev": true,
+      "dependencies": {
+        "http-proxy-agent": "^4.0.0",
+        "https-proxy-agent": "^5.0.0",
+        "node-fetch": "^2.6.1",
+        "stream-events": "^1.0.5",
+        "uuid": "^8.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/through": {
       "version": "2.3.8",
       "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
@@ -5443,6 +5307,24 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/urlgrey": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/urlgrey/-/urlgrey-1.0.0.tgz",
+      "integrity": "sha512-hJfIzMPJmI9IlLkby8QrsCykQ+SXDeO2W5Q9QTW3QpqZVTx4a/K7p8/5q+/isD8vsbVaFgql/gvAoQCRQ2Cb5w==",
+      "dev": true,
+      "dependencies": {
+        "fast-url-parser": "^1.1.3"
+      }
+    },
+    "node_modules/uuid": {
+      "version": "8.3.2",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
+      "integrity": "sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg==",
+      "dev": true,
+      "bin": {
+        "uuid": "dist/bin/uuid"
+      }
+    },
     "node_modules/v8-to-istanbul": {
       "version": "9.1.3",
       "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-9.1.3.tgz",
diff --git a/package.json b/package.json
index 16e709e1..d51321bd 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,6 @@
     "test": "npm run test-node && npm run test-chrome",
     "test-node": "mocha --require ./test/bootstrap/index.js --reporter dot test/*.js",
     "test-chrome": "web-test-runner --playwright",
-    "test-cov": "istanbul cover ./node_modules/.bin/_mocha -- --require ./test/bootstrap/index.js test/*.js",
     "clean": "rm -f chai.js coverage"
   },
   "engines": {
@@ -55,7 +54,6 @@
     "@web/test-runner-playwright": "^0.10.2",
     "bump-cli": "^1.1.3",
     "esbuild": "^0.17.3",
-    "istanbul": "^0.4.3",
     "mocha": "^8.3.0"
   }
 }