feat: start working on test page

README.md

@@ -222,7 +222,7 @@ document.addEventListener("DOMContentLoaded", () => {
   bazObserver.addListener<HTMLInputElement>("input", {
     all: true,        // use querySelectorAll() instead of querySelector()
     continuous: true, // don't remove the listener after it was called once
-    debounce: 200,    // debounce the listener by 200ms
+    debounce: 50,     // debounce the listener by 50ms
     listener: (elements) => {
       console.log("Input elements found:", elements);
     },

package-lock.json

@@ -1,20 +1,22 @@
 {
   "name": "@sv443-network/userutils",
-  "version": "1.1.1",
+  "version": "2.0.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@sv443-network/userutils",
-      "version": "1.1.1",
+      "version": "2.0.1",
       "license": "MIT",
       "devDependencies": {
         "@changesets/cli": "^2.26.2",
+        "@types/express": "^4.17.19",
         "@types/greasemonkey": "^4.0.4",
         "@types/node": "^20.5.9",
         "@typescript-eslint/eslint-plugin": "^6.2.1",
         "@typescript-eslint/parser": "^6.2.1",
         "eslint": "^8.46.0",
+        "express": "^4.18.2",
         "ts-node": "^10.9.1",
         "tslib": "^2.6.1",
         "tsup": "^7.2.0",
@@ -1409,12 +1411,61 @@
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       "dev": true
     },
+    "node_modules/@types/body-parser": {
+      "version": "1.19.3",
+      "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.19.3.tgz",
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+      "dev": true,
+      "dependencies": {
+        "@types/connect": "*",
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/connect": {
+      "version": "3.4.36",
+      "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.36.tgz",
+      "integrity": "sha512-P63Zd/JUGq+PdrM1lv0Wv5SBYeA2+CORvbrXbngriYY0jzLUWfQMQQxOhjONEz/wlHOAxOdY7CY65rgQdTjq2w==",
+      "dev": true,
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/express": {
+      "version": "4.17.19",
+      "resolved": "https://registry.npmjs.org/@types/express/-/express-4.17.19.tgz",
+      "integrity": "sha512-UtOfBtzN9OvpZPPbnnYunfjM7XCI4jyk1NvnFhTVz5krYAnW4o5DCoIekvms+8ApqhB4+9wSge1kBijdfTSmfg==",
+      "dev": true,
+      "dependencies": {
+        "@types/body-parser": "*",
+        "@types/express-serve-static-core": "^4.17.33",
+        "@types/qs": "*",
+        "@types/serve-static": "*"
+      }
+    },
+    "node_modules/@types/express-serve-static-core": {
+      "version": "4.17.37",
+      "resolved": "https://registry.npmjs.org/@types/express-serve-static-core/-/express-serve-static-core-4.17.37.tgz",
+      "integrity": "sha512-ZohaCYTgGFcOP7u6aJOhY9uIZQgZ2vxC2yWoArY+FeDXlqeH66ZVBjgvg+RLVAS/DWNq4Ap9ZXu1+SUQiiWYMg==",
+      "dev": true,
+      "dependencies": {
+        "@types/node": "*",
+        "@types/qs": "*",
+        "@types/range-parser": "*",
+        "@types/send": "*"
+      }
+    },
     "node_modules/@types/greasemonkey": {
       "version": "4.0.4",
       "resolved": "https://registry.npmjs.org/@types/greasemonkey/-/greasemonkey-4.0.4.tgz",
       "integrity": "sha512-OA+sbH6cPgVMpAM2wAABY7D1ASiJ4vVD+uSmvQSwTatriWtTekDa7p1A5VUSSjBlrskCdOiKnLBjv5jU5E/8cg==",
       "dev": true
     },
+    "node_modules/@types/http-errors": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@types/http-errors/-/http-errors-2.0.2.tgz",
+      "integrity": "sha512-lPG6KlZs88gef6aD85z3HNkztpj7w2R7HmR3gygjfXCQmsLloWNARFkMuzKiiY8FGdh1XDpgBdrSf4aKDiA7Kg==",
+      "dev": true
+    },
     "node_modules/@types/is-ci": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/@types/is-ci/-/is-ci-3.0.0.tgz",
@@ -1430,6 +1481,12 @@
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       "dev": true
     },
+    "node_modules/@types/mime": {
+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/@types/mime/-/mime-1.3.3.tgz",
+      "integrity": "sha512-Ys+/St+2VF4+xuY6+kDIXGxbNRO0mesVg0bbxEfB97Od1Vjpjx9KD1qxs64Gcb3CWPirk9Xe+PT4YiiHQ9T+eg==",
+      "dev": true
+    },
     "node_modules/@types/minimist": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/@types/minimist/-/minimist-1.2.2.tgz",
@@ -1448,12 +1505,45 @@
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       "dev": true
     },
+    "node_modules/@types/qs": {
+      "version": "6.9.8",
+      "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.9.8.tgz",
+      "integrity": "sha512-u95svzDlTysU5xecFNTgfFG5RUWu1A9P0VzgpcIiGZA9iraHOdSzcxMxQ55DyeRaGCSxQi7LxXDI4rzq/MYfdg==",
+      "dev": true
+    },
+    "node_modules/@types/range-parser": {
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/@types/range-parser/-/range-parser-1.2.5.tgz",
+      "integrity": "sha512-xrO9OoVPqFuYyR/loIHjnbvvyRZREYKLjxV4+dY6v3FQR3stQ9ZxIGkaclF7YhI9hfjpuTbu14hZEy94qKLtOA==",
+      "dev": true
+    },
     "node_modules/@types/semver": {
       "version": "7.5.0",
       "resolved": "https://registry.npmjs.org/@types/semver/-/semver-7.5.0.tgz",
       "integrity": "sha512-G8hZ6XJiHnuhQKR7ZmysCeJWE08o8T0AXtk5darsCaTVsYZhhgUrq53jizaR2FvsoeCwJhlmwTjkXBY5Pn/ZHw==",
       "dev": true
     },
+    "node_modules/@types/send": {
+      "version": "0.17.2",
+      "resolved": "https://registry.npmjs.org/@types/send/-/send-0.17.2.tgz",
+      "integrity": "sha512-aAG6yRf6r0wQ29bkS+x97BIs64ZLxeE/ARwyS6wrldMm3C1MdKwCcnnEwMC1slI8wuxJOpiUH9MioC0A0i+GJw==",
+      "dev": true,
+      "dependencies": {
+        "@types/mime": "^1",
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/serve-static": {
+      "version": "1.15.3",
+      "resolved": "https://registry.npmjs.org/@types/serve-static/-/serve-static-1.15.3.tgz",
+      "integrity": "sha512-yVRvFsEMrv7s0lGhzrggJjNOSmZCdgCjw9xWrPr/kNNLp6FaDfMC1KaYl3TSJ0c58bECwNBMoQrZJ8hA8E1eFg==",
+      "dev": true,
+      "dependencies": {
+        "@types/http-errors": "*",
+        "@types/mime": "*",
+        "@types/node": "*"
+      }
+    },
     "node_modules/@typescript-eslint/eslint-plugin": {
       "version": "6.2.1",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-6.2.1.tgz",
@@ -1644,6 +1734,19 @@
         "url": "https://opencollective.com/typescript-eslint"
       }
     },
+    "node_modules/accepts": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
+      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
+      "dev": true,
+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/acorn": {
       "version": "8.10.0",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.10.0.tgz",
@@ -1767,6 +1870,12 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg==",
+      "dev": true
+    },
     "node_modules/array-union": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/array-union/-/array-union-2.1.0.tgz",
@@ -1862,6 +1971,45 @@
         "node": ">=8"
       }
     },
+    "node_modules/body-parser": {
+      "version": "1.20.1",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.1.tgz",
+      "integrity": "sha512-jWi7abTbYwajOytWCQc37VulmWiRae5RyTpaCyDcS5/lMdtwSz5lOpDE67srw/HYe35f1z3fDQw+3txg7gNtWw==",
+      "dev": true,
+      "dependencies": {
+        "bytes": "3.1.2",
+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "2.0.0",
+        "destroy": "1.2.0",
+        "http-errors": "2.0.0",
+        "iconv-lite": "0.4.24",
+        "on-finished": "2.4.1",
+        "qs": "6.11.0",
+        "raw-body": "2.5.1",
+        "type-is": "~1.6.18",
+        "unpipe": "1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.8",
+        "npm": "1.2.8000 || >= 1.4.16"
+      }
+    },
+    "node_modules/body-parser/node_modules/debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "dev": true,
+      "dependencies": {
+        "ms": "2.0.0"
+      }
+    },
+    "node_modules/body-parser/node_modules/ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A==",
+      "dev": true
+    },
     "node_modules/brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -1908,6 +2056,15 @@
         "esbuild": ">=0.17"
       }
     },
+    "node_modules/bytes": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
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+      "dev": true,
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/cac": {
       "version": "6.7.14",
       "resolved": "https://registry.npmjs.org/cac/-/cac-6.7.14.tgz",
@@ -2097,6 +2254,42 @@
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       "dev": true
     },
+    "node_modules/content-disposition": {
+      "version": "0.5.4",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.4.tgz",
+      "integrity": "sha512-FveZTNuGw04cxlAiWbzi6zTAL/lhehaWbTtgluJh4/E95DqMwTmha3KZN1aAWA8cFIhHzMZUvLevkw5Rqk+tSQ==",
+      "dev": true,
+      "dependencies": {
+        "safe-buffer": "5.2.1"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/content-type": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.5.tgz",
+      "integrity": "sha512-nTjqfcBFEipKdXCv4YDQWCfmcLZKm81ldF0pAopTvyrFGVbcR6P/VAAd5G7N+0tTr8QqiU0tFadD6FK4NtJwOA==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/cookie": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.5.0.tgz",
+      "integrity": "sha512-YZ3GUyn/o8gfKJlnlX7g7xq4gyO6OSuhGPKaaGssGB2qgDUS0gPgtTvoyZLTt9Ab6dC4hfc9dV5arkvc/OCmrw==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/cookie-signature": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
+      "integrity": "sha512-QADzlaHc8icV8I7vbaJXJwod9HWYp8uCqf1xa4OfNu1T7JVxQIrUgOWtHdNDtPiywmFbiS12VjotIXLrKM3orQ==",
+      "dev": true
+    },
     "node_modules/create-require": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/create-require/-/create-require-1.1.1.tgz",
@@ -2235,6 +2428,25 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/depd": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
+      "integrity": "sha512-g7nH6P6dyDioJogAAGprGpCtVImJhpPk/roCzdb3fIh61/s/nPsfR6onyMwkCAR/OlC3yBC0lESvUoQEAssIrw==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/destroy": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.2.0.tgz",
+      "integrity": "sha512-2sJGJTaXIIaR1w4iJSNoN0hnMY7Gpc/n8D4qSCJw8QqFWXf7cuAgnEHxBpweaVcPevC2l3KpjYCx3NypQQgaJg==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.8",
+        "npm": "1.2.8000 || >= 1.4.16"
+      }
+    },
     "node_modules/detect-indent": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/detect-indent/-/detect-indent-6.1.0.tgz",
@@ -2277,12 +2489,27 @@
         "node": ">=6.0.0"
       }
     },
+    "node_modules/ee-first": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
+      "integrity": "sha512-WMwm9LhRUo+WUaRN+vRuETqG89IgZphVSNkdFgeb6sS/E4OrDIN7t48CAewSHXc6C8lefD8KKfr5vY61brQlow==",
+      "dev": true
+    },
     "node_modules/emoji-regex": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
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       "dev": true
     },
+    "node_modules/encodeurl": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
+      "integrity": "sha512-TPJXq8JqFaVYm2CWmPvnP2Iyo4ZSM7/QKcSmuMLDObfpH5fi7RUGmd/rTDf+rut/saiDiQEeVTNgAmJEdAOx0w==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/enquirer": {
       "version": "2.4.1",
       "resolved": "https://registry.npmjs.org/enquirer/-/enquirer-2.4.1.tgz",
@@ -2444,6 +2671,12 @@
         "node": ">=6"
       }
     },
+    "node_modules/escape-html": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
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+      "dev": true
+    },
     "node_modules/escape-string-regexp": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-4.0.0.tgz",
@@ -2610,6 +2843,15 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/etag": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
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+      "dev": true,
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/execa": {
       "version": "5.1.1",
       "resolved": "https://registry.npmjs.org/execa/-/execa-5.1.1.tgz",
@@ -2633,6 +2875,63 @@
         "url": "https://github.com/sindresorhus/execa?sponsor=1"
       }
     },
+    "node_modules/express": {
+      "version": "4.18.2",
+      "resolved": "https://registry.npmjs.org/express/-/express-4.18.2.tgz",
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+      "dev": true,
+      "dependencies": {
+        "accepts": "~1.3.8",
+        "array-flatten": "1.1.1",
+        "body-parser": "1.20.1",
+        "content-disposition": "0.5.4",
+        "content-type": "~1.0.4",
+        "cookie": "0.5.0",
+        "cookie-signature": "1.0.6",
+        "debug": "2.6.9",
+        "depd": "2.0.0",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "finalhandler": "1.2.0",
+        "fresh": "0.5.2",
+        "http-errors": "2.0.0",
+        "merge-descriptors": "1.0.1",
+        "methods": "~1.1.2",
+        "on-finished": "2.4.1",
+        "parseurl": "~1.3.3",
+        "path-to-regexp": "0.1.7",
+        "proxy-addr": "~2.0.7",
+        "qs": "6.11.0",
+        "range-parser": "~1.2.1",
+        "safe-buffer": "5.2.1",
+        "send": "0.18.0",
+        "serve-static": "1.15.0",
+        "setprototypeof": "1.2.0",
+        "statuses": "2.0.1",
+        "type-is": "~1.6.18",
+        "utils-merge": "1.0.1",
+        "vary": "~1.1.2"
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+      "dev": true,
+      "dependencies": {
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+      }
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+    "node_modules/express/node_modules/ms": {
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       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/stream-transform/-/stream-transform-2.1.3.tgz",
@@ -5272,6 +5887,15 @@
         "node": ">=8.0"
       }
     },
+    "node_modules/toidentifier": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
     "node_modules/tr46": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/tr46/-/tr46-1.0.1.tgz",
@@ -5465,6 +6089,19 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "dev": true,
+      "dependencies": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/typed-array-buffer": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/typed-array-buffer/-/typed-array-buffer-1.0.0.tgz",
@@ -5567,6 +6204,15 @@
         "node": ">= 4.0.0"
       }
     },
+    "node_modules/unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/uri-js": {
       "version": "4.4.1",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
@@ -5576,6 +6222,15 @@
         "punycode": "^2.1.0"
       }
     },
+    "node_modules/utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.4.0"
+      }
+    },
     "node_modules/v8-compile-cache-lib": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/v8-compile-cache-lib/-/v8-compile-cache-lib-3.0.1.tgz",
@@ -5592,6 +6247,15 @@
         "spdx-expression-parse": "^3.0.0"
       }
     },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/wcwidth": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/wcwidth/-/wcwidth-1.0.1.tgz",

package.json

@@ -14,7 +14,8 @@
     "post-build-global": "npm run node-ts -- ./tools/post-build-global.mts",
     "dev": "npm run build-common -- --sourcemap --watch --onSuccess \"npm run build-types && echo Finished building.\"",
     "publish-package": "changeset publish",
-    "node-ts": "node --no-warnings=ExperimentalWarning --enable-source-maps --loader ts-node/esm"
+    "node-ts": "node --no-warnings=ExperimentalWarning --enable-source-maps --loader ts-node/esm",
+    "test": "npm run node-ts -- ./test/server.mts"
   },
   "repository": {
     "type": "git",
@@ -35,11 +36,13 @@
   "homepage": "https://github.com/Sv443-Network/UserUtils",
   "devDependencies": {
     "@changesets/cli": "^2.26.2",
+    "@types/express": "^4.17.19",
     "@types/greasemonkey": "^4.0.4",
     "@types/node": "^20.5.9",
     "@typescript-eslint/eslint-plugin": "^6.2.1",
     "@typescript-eslint/parser": "^6.2.1",
     "eslint": "^8.46.0",
+    "express": "^4.18.2",
     "ts-node": "^10.9.1",
     "tslib": "^2.6.1",
     "tsup": "^7.2.0",
@@ -55,4 +58,4 @@
     "/CHANGELOG.md",
     "/LICENSE.txt"
   ]
-}
+}

test/index.css

@@ -0,0 +1,14 @@
+body {
+  font-family: sans-serif;
+}
+
+.selector-observer-subcont {
+  background-color: rgba(0, 0, 255, 0.33);
+  padding: 8px;
+}
+
+.selector-observer-item {
+  font-family: "Cascadia Code", "Courier New", monospace;
+  background-color: #57ed96;
+  color: black;
+}

test/index.html

@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>UserUtils Test Page</title>
+    <meta charset="utf-8" />
+    <link rel="stylesheet" href="./index.css" />
+    <script src="./index.js"></script>
+  </head>
+  <body>
+    <section>
+      <h3>SelectorObserver - staggered spawn child elements</h3>
+      <button id="selector-observer-btn">Spawn</button>
+      <div id="selector-observer-cont"></div>
+    </section>
+  </body>
+</html>

test/index.js

@@ -0,0 +1,58 @@
+function load() {
+  document
+    .querySelector("#selector-observer-btn")
+    .addEventListener("click", selectorObserver);
+}
+
+document.addEventListener("DOMContentLoaded", load);
+
+//#SECTION SelectorObserver
+
+function selectorObserver() {
+  const container = document.querySelector("#selector-observer-cont");
+
+  const cont1 = document.createElement("div");
+  cont1.id = "selector-observer-subcont1";
+  cont1.classList.add("selector-observer-subcont");
+
+  const cont2 = document.createElement("div");
+  cont2.id = "selector-observer-subcont2";
+  cont2.classList.add("selector-observer-subcont");
+
+  const cont3 = document.createElement("div");
+  cont3.id = "selector-observer-subcont3";
+  cont3.classList.add("selector-observer-subcont");
+
+  container.appendChild(cont1);
+  addElements(1, cont1);
+
+  setTimeout(() => {
+    cont1.appendChild(cont2);
+    addElements(2, cont2);
+
+    setTimeout(() => {
+      cont2.appendChild(cont3);
+      addElements(3, cont3);
+    }, 5000);
+  }, 5000);
+}
+
+/**
+ * @param {number} contNum
+ * @param {Element} container
+ */
+async function addElements(contNum, container) {
+  for (let i = 0; i < 5; i++) {
+    const div = document.createElement("div");
+    div.classList.add("selector-observer-item");
+    div.innerText = `Container #${contNum} - Item #${i}`;
+    container.appendChild(div);
+    await sleep(1000);
+  }
+}
+
+//#SECTION utils
+
+function sleep(ms) {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}

test/server.mts

@@ -0,0 +1,14 @@
+import express from "express";
+import { dirname } from "path";
+import { fileURLToPath } from "url";
+
+const port = 12121;
+const path = dirname(fileURLToPath(import.meta.url));
+
+const app = express();
+
+app.use(express.static(path));
+
+app.listen(port, () => {
+  console.log(`Listening on: \x1b[34m\x1b[4mhttp://localhost:${port}/\x1b[0m`);
+});