diff --git a/.eslintignore b/.eslintignore
deleted file mode 100644
index 2ec78ea4e..000000000
--- a/.eslintignore
+++ /dev/null
@@ -1,16 +0,0 @@
-
-# /node_modules/* in the project root is ignored by default
-# build artefacts
-dist/*
-coverage/*
-build*/*
-# data definition files
-**/*.d.ts
-# 3rd party libs
-/src/public/
-# custom definition files
-/src/types/
-# regression output
-/regression/output*
-# generated source code
-**/generated
diff --git a/.eslintrc b/.eslintrc
deleted file mode 100644
index 4c744688e..000000000
--- a/.eslintrc
+++ /dev/null
@@ -1,20 +0,0 @@
-{
-  "parser": "@typescript-eslint/parser",
-  "extends": [
-    "plugin:@typescript-eslint/recommended",
-    "prettier"
-  ],
-  "parserOptions": {
-    "ecmaVersion": 2018,
-    "sourceType": "module"
-  },
-  "rules": {
-    "semi": ["error", "always"],
-    "quotes": ["error", "single", { "avoidEscape": true }],
-    "@typescript-eslint/ban-ts-comment": "off",
-    "@typescript-eslint/explicit-function-return-type": "off",
-    "@typescript-eslint/no-empty-function": "off",
-    "@typescript-eslint/no-explicit-any": "off",
-    "@typescript-eslint/no-unsafe-declaration-merging": "off"
-  }
-}
\ No newline at end of file
diff --git a/eslint.config.mjs b/eslint.config.mjs
new file mode 100644
index 000000000..575f4066b
--- /dev/null
+++ b/eslint.config.mjs
@@ -0,0 +1,54 @@
+import tsParser from '@typescript-eslint/parser';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import js from '@eslint/js';
+import { FlatCompat } from '@eslint/eslintrc';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all
+});
+
+export default [
+  {
+    ignores: [
+      'dist/*',
+      'coverage/*',
+      'build*/*',
+      '**/*.d.ts',
+      'src/public/',
+      'src/types/',
+      'regression/output*',
+      '**/generated'
+    ]
+  },
+  ...compat.extends('plugin:@typescript-eslint/recommended', 'prettier'),
+  {
+    languageOptions: {
+      parser: tsParser,
+      ecmaVersion: 2018,
+      sourceType: 'module'
+    },
+
+    rules: {
+      semi: ['error', 'always'],
+
+      quotes: [
+        'error',
+        'single',
+        {
+          avoidEscape: true
+        }
+      ],
+
+      '@typescript-eslint/ban-ts-comment': 'off',
+      '@typescript-eslint/explicit-function-return-type': 'off',
+      '@typescript-eslint/no-empty-function': 'off',
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-unsafe-declaration-merging': 'off'
+    }
+  }
+];
diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index f2a8ecfff..ba01488b0 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
@@ -36,6 +36,8 @@
         "sushi": "dist/app.js"
       },
       "devDependencies": {
+        "@eslint/eslintrc": "^3.1.0",
+        "@eslint/js": "^9.7.0",
         "@types/diff": "^5.2.1",
         "@types/fs-extra": "^11.0.4",
         "@types/html-minifier-terser": "5.1.1",
@@ -50,14 +52,14 @@
         "@types/temp": "^0.9.4",
         "@types/text-table": "^0.2.5",
         "@types/valid-url": "^1.0.7",
-        "@typescript-eslint/eslint-plugin": "^7.13.1",
-        "@typescript-eslint/parser": "^7.13.1",
+        "@typescript-eslint/eslint-plugin": "^8.0.0-alpha.51",
+        "@typescript-eslint/parser": "^8.0.0-alpha.51",
         "acorn": "^8.12.0",
         "copyfiles": "^2.4.1",
         "del-cli": "^5.1.0",
         "diff": "^5.2.0",
         "diff2html-cli": "^5.2.15",
-        "eslint": "^8.57.0",
+        "eslint": "^9.7.0",
         "eslint-config-prettier": "^9.1.0",
         "extract-zip": "^2.0.1",
         "jest": "^29.7.0",
@@ -65,7 +67,7 @@
         "json-diff": "^1.0.6",
         "nock": "^13.5.4",
         "opener": "^1.5.2",
-        "prettier": "^3.3.2",
+        "prettier": "^3.3.3",
         "ts-jest": "^29.1.5",
         "ts-node": "^10.9.2",
         "typescript": "^5.4.5"
@@ -705,24 +707,60 @@
       }
     },
     "node_modules/@eslint-community/regexpp": {
-      "version": "4.10.1",
-      "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.10.1.tgz",
-      "integrity": "sha512-Zm2NGpWELsQAD1xsJzGQpYfvICSsFkEpU0jxBjfdC6uNEWXcHnfs9hScFWtXVDVl+rBQJGrl4g1vcKIejpH9dA==",
+      "version": "4.11.0",
+      "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.11.0.tgz",
+      "integrity": "sha512-G/M/tIiMrTAxEWRfLfQJMmGNX28IxBg4PBz8XqQhqUHLFI6TL2htpIB1iQCj144V5ee/JaKyT9/WZ0MGZWfA7A==",
       "dev": true,
       "engines": {
         "node": "^12.0.0 || ^14.0.0 || >=16.0.0"
       }
     },
+    "node_modules/@eslint/config-array": {
+      "version": "0.17.1",
+      "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.17.1.tgz",
+      "integrity": "sha512-BlYOpej8AQ8Ev9xVqroV7a02JK3SkBAaN9GfMMH9W6Ch8FlQlkjGw4Ir7+FgYwfirivAf4t+GtzuAxqfukmISA==",
+      "dev": true,
+      "dependencies": {
+        "@eslint/object-schema": "^2.1.4",
+        "debug": "^4.3.1",
+        "minimatch": "^3.1.2"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/config-array/node_modules/brace-expansion": {
+      "version": "1.1.11",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+      "dev": true,
+      "dependencies": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "node_modules/@eslint/config-array/node_modules/minimatch": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
+      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
+      "dev": true,
+      "dependencies": {
+        "brace-expansion": "^1.1.7"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/@eslint/eslintrc": {
-      "version": "2.1.4",
-      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-2.1.4.tgz",
-      "integrity": "sha512-269Z39MS6wVJtsoUl10L60WdkhJVdPG24Q4eZTH3nnF6lpvSShEK3wQjDX9JRWAUPvPh7COouPpU9IrqaZFvtQ==",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-3.1.0.tgz",
+      "integrity": "sha512-4Bfj15dVJdoy3RfZmmo86RK1Fwzn6SstsvK9JS+BaVKqC6QQQQyXekNaC+g+LKNgkQ+2VhGAzm6hO40AhMR3zQ==",
       "dev": true,
       "dependencies": {
         "ajv": "^6.12.4",
         "debug": "^4.3.2",
-        "espree": "^9.6.0",
-        "globals": "^13.19.0",
+        "espree": "^10.0.1",
+        "globals": "^14.0.0",
         "ignore": "^5.2.0",
         "import-fresh": "^3.2.1",
         "js-yaml": "^4.1.0",
@@ -730,7 +768,7 @@
         "strip-json-comments": "^3.1.1"
       },
       "engines": {
-        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
         "url": "https://opencollective.com/eslint"
@@ -781,12 +819,21 @@
       }
     },
     "node_modules/@eslint/js": {
-      "version": "8.57.0",
-      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-8.57.0.tgz",
-      "integrity": "sha512-Ys+3g2TaW7gADOJzPt83SJtCDhMjndcDMFVQ/Tj9iA1BfJzFKD9mAUXT3OenpuPHbI6P/myECxRJrofUsDx/5g==",
+      "version": "9.7.0",
+      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.7.0.tgz",
+      "integrity": "sha512-ChuWDQenef8OSFnvuxv0TCVxEwmu3+hPNKvM9B34qpM0rDRbjL8t5QkQeHHeAfsKQjuH9wS82WeCi1J/owatng==",
       "dev": true,
       "engines": {
-        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/object-schema": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/@eslint/object-schema/-/object-schema-2.1.4.tgz",
+      "integrity": "sha512-BsWiH1yFGjXXS2yvrf5LyuoSIIbPrGUWob917o+BTKuZ7qJdxX8aJLRxs1fS9n6r7vESrq1OUqb68dANcFXuQQ==",
+      "dev": true,
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       }
     },
     "node_modules/@ewoudenberg/difflib": {
@@ -798,43 +845,6 @@
         "heap": ">= 0.2.0"
       }
     },
-    "node_modules/@humanwhocodes/config-array": {
-      "version": "0.11.14",
-      "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.11.14.tgz",
-      "integrity": "sha512-3T8LkOmg45BV5FICb15QQMsyUSWrQ8AygVfC7ZG32zOalnqrilm018ZVCw0eapXux8FtA33q8PSRSstjee3jSg==",
-      "deprecated": "Use @eslint/config-array instead",
-      "dev": true,
-      "dependencies": {
-        "@humanwhocodes/object-schema": "^2.0.2",
-        "debug": "^4.3.1",
-        "minimatch": "^3.0.5"
-      },
-      "engines": {
-        "node": ">=10.10.0"
-      }
-    },
-    "node_modules/@humanwhocodes/config-array/node_modules/brace-expansion": {
-      "version": "1.1.11",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
-      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
-      "dev": true,
-      "dependencies": {
-        "balanced-match": "^1.0.0",
-        "concat-map": "0.0.1"
-      }
-    },
-    "node_modules/@humanwhocodes/config-array/node_modules/minimatch": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
-      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
-      "dev": true,
-      "dependencies": {
-        "brace-expansion": "^1.1.7"
-      },
-      "engines": {
-        "node": "*"
-      }
-    },
     "node_modules/@humanwhocodes/module-importer": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/@humanwhocodes/module-importer/-/module-importer-1.0.1.tgz",
@@ -848,12 +858,18 @@
         "url": "https://github.com/sponsors/nzakas"
       }
     },
-    "node_modules/@humanwhocodes/object-schema": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/@humanwhocodes/object-schema/-/object-schema-2.0.3.tgz",
-      "integrity": "sha512-93zYdMES/c1D69yZiKDBj0V24vqNzB/koF26KPaagAfd3P/4gUlh3Dys5ogAK+Exi9QyzlD8x/08Zt7wIKcDcA==",
-      "deprecated": "Use @eslint/object-schema instead",
-      "dev": true
+    "node_modules/@humanwhocodes/retry": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/retry/-/retry-0.3.0.tgz",
+      "integrity": "sha512-d2CGZR2o7fS6sWB7DG/3a95bGKQyHMACZ5aW8qGkkqQpUoZV6C0X7Pc7l4ZNMZkfNBf4VWNe9E1jRsf0G146Ew==",
+      "dev": true,
+      "engines": {
+        "node": ">=18.18"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/nzakas"
+      }
     },
     "node_modules/@istanbuljs/load-nyc-config": {
       "version": "1.1.0",
@@ -1653,31 +1669,31 @@
       }
     },
     "node_modules/@typescript-eslint/eslint-plugin": {
-      "version": "7.13.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-7.13.1.tgz",
-      "integrity": "sha512-kZqi+WZQaZfPKnsflLJQCz6Ze9FFSMfXrrIOcyargekQxG37ES7DJNpJUE9Q/X5n3yTIP/WPutVNzgknQ7biLg==",
+      "version": "8.0.0-alpha.51",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.0.0-alpha.51.tgz",
+      "integrity": "sha512-989dk3/IA2HNdfl8T1Tj0+AEAtqHN5Cdac7Ff1N367Lh5e5xKi3nXWMkptbZaAEo/wi5+CZD8jngQ70wnCRweA==",
       "dev": true,
       "dependencies": {
         "@eslint-community/regexpp": "^4.10.0",
-        "@typescript-eslint/scope-manager": "7.13.1",
-        "@typescript-eslint/type-utils": "7.13.1",
-        "@typescript-eslint/utils": "7.13.1",
-        "@typescript-eslint/visitor-keys": "7.13.1",
+        "@typescript-eslint/scope-manager": "8.0.0-alpha.51",
+        "@typescript-eslint/type-utils": "8.0.0-alpha.51",
+        "@typescript-eslint/utils": "8.0.0-alpha.51",
+        "@typescript-eslint/visitor-keys": "8.0.0-alpha.51",
         "graphemer": "^1.4.0",
         "ignore": "^5.3.1",
         "natural-compare": "^1.4.0",
         "ts-api-utils": "^1.3.0"
       },
       "engines": {
-        "node": "^18.18.0 || >=20.0.0"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
         "type": "opencollective",
         "url": "https://opencollective.com/typescript-eslint"
       },
       "peerDependencies": {
-        "@typescript-eslint/parser": "^7.0.0",
-        "eslint": "^8.56.0"
+        "@typescript-eslint/parser": "^8.0.0 || ^8.0.0-alpha.0",
+        "eslint": "^8.57.0 || ^9.0.0"
       },
       "peerDependenciesMeta": {
         "typescript": {
@@ -1686,26 +1702,26 @@
       }
     },
     "node_modules/@typescript-eslint/parser": {
-      "version": "7.13.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-7.13.1.tgz",
-      "integrity": "sha512-1ELDPlnLvDQ5ybTSrMhRTFDfOQEOXNM+eP+3HT/Yq7ruWpciQw+Avi73pdEbA4SooCawEWo3dtYbF68gN7Ed1A==",
+      "version": "8.0.0-alpha.51",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-8.0.0-alpha.51.tgz",
+      "integrity": "sha512-UPMhWLqkP/wBGB3/eI9fRG8UFFmT8tTLlBUQFN01xtsRNhYlMYS5FQHDMkfPynnKp62AqLRrwkrI49cZN3aDUA==",
       "dev": true,
       "dependencies": {
-        "@typescript-eslint/scope-manager": "7.13.1",
-        "@typescript-eslint/types": "7.13.1",
-        "@typescript-eslint/typescript-estree": "7.13.1",
-        "@typescript-eslint/visitor-keys": "7.13.1",
+        "@typescript-eslint/scope-manager": "8.0.0-alpha.51",
+        "@typescript-eslint/types": "8.0.0-alpha.51",
+        "@typescript-eslint/typescript-estree": "8.0.0-alpha.51",
+        "@typescript-eslint/visitor-keys": "8.0.0-alpha.51",
         "debug": "^4.3.4"
       },
       "engines": {
-        "node": "^18.18.0 || >=20.0.0"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
         "type": "opencollective",
         "url": "https://opencollective.com/typescript-eslint"
       },
       "peerDependencies": {
-        "eslint": "^8.56.0"
+        "eslint": "^8.57.0 || ^9.0.0"
       },
       "peerDependenciesMeta": {
         "typescript": {
@@ -1714,16 +1730,16 @@
       }
     },
     "node_modules/@typescript-eslint/scope-manager": {
-      "version": "7.13.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-7.13.1.tgz",
-      "integrity": "sha512-adbXNVEs6GmbzaCpymHQ0MB6E4TqoiVbC0iqG3uijR8ZYfpAXMGttouQzF4Oat3P2GxDVIrg7bMI/P65LiQZdg==",
+      "version": "8.0.0-alpha.51",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-8.0.0-alpha.51.tgz",
+      "integrity": "sha512-zT8Ib31deJCqRVJepZOMFoHiFAsSHOh5TmedcFeqyiMuzrqBMtF95iv6mPJqFDIXNgxmTkahpRan1z043ckBnA==",
       "dev": true,
       "dependencies": {
-        "@typescript-eslint/types": "7.13.1",
-        "@typescript-eslint/visitor-keys": "7.13.1"
+        "@typescript-eslint/types": "8.0.0-alpha.51",
+        "@typescript-eslint/visitor-keys": "8.0.0-alpha.51"
       },
       "engines": {
-        "node": "^18.18.0 || >=20.0.0"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
         "type": "opencollective",
@@ -1731,26 +1747,23 @@
       }
     },
     "node_modules/@typescript-eslint/type-utils": {
-      "version": "7.13.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/type-utils/-/type-utils-7.13.1.tgz",
-      "integrity": "sha512-aWDbLu1s9bmgPGXSzNCxELu+0+HQOapV/y+60gPXafR8e2g1Bifxzevaa+4L2ytCWm+CHqpELq4CSoN9ELiwCg==",
+      "version": "8.0.0-alpha.51",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/type-utils/-/type-utils-8.0.0-alpha.51.tgz",
+      "integrity": "sha512-KqU2e3KITMGlRfG4ehfO2zS0GutDWc+zV2nwbRDQdUfh1izgFDAh5UqiJ8YafXVzY1v0dnRggnmvjOMotjQa1w==",
       "dev": true,
       "dependencies": {
-        "@typescript-eslint/typescript-estree": "7.13.1",
-        "@typescript-eslint/utils": "7.13.1",
+        "@typescript-eslint/typescript-estree": "8.0.0-alpha.51",
+        "@typescript-eslint/utils": "8.0.0-alpha.51",
         "debug": "^4.3.4",
         "ts-api-utils": "^1.3.0"
       },
       "engines": {
-        "node": "^18.18.0 || >=20.0.0"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
         "type": "opencollective",
         "url": "https://opencollective.com/typescript-eslint"
       },
-      "peerDependencies": {
-        "eslint": "^8.56.0"
-      },
       "peerDependenciesMeta": {
         "typescript": {
           "optional": true
@@ -1758,12 +1771,12 @@
       }
     },
     "node_modules/@typescript-eslint/types": {
-      "version": "7.13.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-7.13.1.tgz",
-      "integrity": "sha512-7K7HMcSQIAND6RBL4kDl24sG/xKM13cA85dc7JnmQXw2cBDngg7c19B++JzvJHRG3zG36n9j1i451GBzRuHchw==",
+      "version": "8.0.0-alpha.51",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-8.0.0-alpha.51.tgz",
+      "integrity": "sha512-joqeu3jITe9BbgXAggKKg9mBIGDL6mAf2JVlo00zWP50u4qnsa3NWKMwWp77pjtI9E2DPU0vlTEdL+v/3aTPJA==",
       "dev": true,
       "engines": {
-        "node": "^18.18.0 || >=20.0.0"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
         "type": "opencollective",
@@ -1771,13 +1784,13 @@
       }
     },
     "node_modules/@typescript-eslint/typescript-estree": {
-      "version": "7.13.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-7.13.1.tgz",
-      "integrity": "sha512-uxNr51CMV7npU1BxZzYjoVz9iyjckBduFBP0S5sLlh1tXYzHzgZ3BR9SVsNed+LmwKrmnqN3Kdl5t7eZ5TS1Yw==",
+      "version": "8.0.0-alpha.51",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-8.0.0-alpha.51.tgz",
+      "integrity": "sha512-p3kD3rVdqmr4Iga86xzUR5wTsIKof/GsqnUMWZbmFpD3fmMXs1VLoXJegTqVMtWncu14dZUohRV2xPSScBAnxg==",
       "dev": true,
       "dependencies": {
-        "@typescript-eslint/types": "7.13.1",
-        "@typescript-eslint/visitor-keys": "7.13.1",
+        "@typescript-eslint/types": "8.0.0-alpha.51",
+        "@typescript-eslint/visitor-keys": "8.0.0-alpha.51",
         "debug": "^4.3.4",
         "globby": "^11.1.0",
         "is-glob": "^4.0.3",
@@ -1786,7 +1799,7 @@
         "ts-api-utils": "^1.3.0"
       },
       "engines": {
-        "node": "^18.18.0 || >=20.0.0"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
         "type": "opencollective",
@@ -1799,50 +1812,44 @@
       }
     },
     "node_modules/@typescript-eslint/utils": {
-      "version": "7.13.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/utils/-/utils-7.13.1.tgz",
-      "integrity": "sha512-h5MzFBD5a/Gh/fvNdp9pTfqJAbuQC4sCN2WzuXme71lqFJsZtLbjxfSk4r3p02WIArOF9N94pdsLiGutpDbrXQ==",
+      "version": "8.0.0-alpha.51",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/utils/-/utils-8.0.0-alpha.51.tgz",
+      "integrity": "sha512-OJac7/t6M/jQlgAQSM2yffKXZL8d/6vTbQPChC5v4oGHFuKHF2dEFeevNJlIS9iR6EtquRsHup2GDwqw6bWyrw==",
       "dev": true,
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.4.0",
-        "@typescript-eslint/scope-manager": "7.13.1",
-        "@typescript-eslint/types": "7.13.1",
-        "@typescript-eslint/typescript-estree": "7.13.1"
+        "@typescript-eslint/scope-manager": "8.0.0-alpha.51",
+        "@typescript-eslint/types": "8.0.0-alpha.51",
+        "@typescript-eslint/typescript-estree": "8.0.0-alpha.51"
       },
       "engines": {
-        "node": "^18.18.0 || >=20.0.0"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
         "type": "opencollective",
         "url": "https://opencollective.com/typescript-eslint"
       },
       "peerDependencies": {
-        "eslint": "^8.56.0"
+        "eslint": "^8.57.0 || ^9.0.0"
       }
     },
     "node_modules/@typescript-eslint/visitor-keys": {
-      "version": "7.13.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-7.13.1.tgz",
-      "integrity": "sha512-k/Bfne7lrP7hcb7m9zSsgcBmo+8eicqqfNAJ7uUY+jkTFpKeH2FSkWpFRtimBxgkyvqfu9jTPRbYOvud6isdXA==",
+      "version": "8.0.0-alpha.51",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-8.0.0-alpha.51.tgz",
+      "integrity": "sha512-bOLfR14nLfhO9BBD1YpmnQSTNTapAIegKsb4Ms1RAQXkJRKIeuLS42AEYRM8uvLiNLk0hDIBjCnMPTAyDAWLbw==",
       "dev": true,
       "dependencies": {
-        "@typescript-eslint/types": "7.13.1",
+        "@typescript-eslint/types": "8.0.0-alpha.51",
         "eslint-visitor-keys": "^3.4.3"
       },
       "engines": {
-        "node": "^18.18.0 || >=20.0.0"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
         "type": "opencollective",
         "url": "https://opencollective.com/typescript-eslint"
       }
     },
-    "node_modules/@ungap/structured-clone": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/@ungap/structured-clone/-/structured-clone-1.2.0.tgz",
-      "integrity": "sha512-zuVdFrMJiuCDQUMCzQaD6KL28MjnqqN8XnAqiEq9PNm/hCPTSGfrXCOfwj1ow4LFb/tNymJPwsNbVePc1xFqrQ==",
-      "dev": true
-    },
     "node_modules/abbrev": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
@@ -3009,18 +3016,6 @@
         "node": ">=8"
       }
     },
-    "node_modules/doctrine": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-3.0.0.tgz",
-      "integrity": "sha512-yS+Q5i3hBf7GBkd4KG8a7eBNNWNGLTaEwwYWUijIYM7zrlYDM0BFXHjjPWlWZ1Rg7UaddZeIDmi9jF3HmqiQ2w==",
-      "dev": true,
-      "dependencies": {
-        "esutils": "^2.0.2"
-      },
-      "engines": {
-        "node": ">=6.0.0"
-      }
-    },
     "node_modules/dot-case": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/dot-case/-/dot-case-3.0.4.tgz",
@@ -3111,41 +3106,37 @@
       }
     },
     "node_modules/eslint": {
-      "version": "8.57.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-8.57.0.tgz",
-      "integrity": "sha512-dZ6+mexnaTIbSBZWgou51U6OmzIhYM2VcNdtiTtI7qPNZm35Akpr0f6vtw3w1Kmn5PYo+tZVfh13WrhpS6oLqQ==",
+      "version": "9.7.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-9.7.0.tgz",
+      "integrity": "sha512-FzJ9D/0nGiCGBf8UXO/IGLTgLVzIxze1zpfA8Ton2mjLovXdAPlYDv+MQDcqj3TmrhAGYfOpz9RfR+ent0AgAw==",
       "dev": true,
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.2.0",
-        "@eslint-community/regexpp": "^4.6.1",
-        "@eslint/eslintrc": "^2.1.4",
-        "@eslint/js": "8.57.0",
-        "@humanwhocodes/config-array": "^0.11.14",
+        "@eslint-community/regexpp": "^4.11.0",
+        "@eslint/config-array": "^0.17.0",
+        "@eslint/eslintrc": "^3.1.0",
+        "@eslint/js": "9.7.0",
         "@humanwhocodes/module-importer": "^1.0.1",
+        "@humanwhocodes/retry": "^0.3.0",
         "@nodelib/fs.walk": "^1.2.8",
-        "@ungap/structured-clone": "^1.2.0",
         "ajv": "^6.12.4",
         "chalk": "^4.0.0",
         "cross-spawn": "^7.0.2",
         "debug": "^4.3.2",
-        "doctrine": "^3.0.0",
         "escape-string-regexp": "^4.0.0",
-        "eslint-scope": "^7.2.2",
-        "eslint-visitor-keys": "^3.4.3",
-        "espree": "^9.6.1",
-        "esquery": "^1.4.2",
+        "eslint-scope": "^8.0.2",
+        "eslint-visitor-keys": "^4.0.0",
+        "espree": "^10.1.0",
+        "esquery": "^1.5.0",
         "esutils": "^2.0.2",
         "fast-deep-equal": "^3.1.3",
-        "file-entry-cache": "^6.0.1",
+        "file-entry-cache": "^8.0.0",
         "find-up": "^5.0.0",
         "glob-parent": "^6.0.2",
-        "globals": "^13.19.0",
-        "graphemer": "^1.4.0",
         "ignore": "^5.2.0",
         "imurmurhash": "^0.1.4",
         "is-glob": "^4.0.0",
         "is-path-inside": "^3.0.3",
-        "js-yaml": "^4.1.0",
         "json-stable-stringify-without-jsonify": "^1.0.1",
         "levn": "^0.4.1",
         "lodash.merge": "^4.6.2",
@@ -3159,10 +3150,10 @@
         "eslint": "bin/eslint.js"
       },
       "engines": {
-        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
-        "url": "https://opencollective.com/eslint"
+        "url": "https://eslint.org/donate"
       }
     },
     "node_modules/eslint-config-prettier": {
@@ -3178,16 +3169,16 @@
       }
     },
     "node_modules/eslint-scope": {
-      "version": "7.2.2",
-      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-7.2.2.tgz",
-      "integrity": "sha512-dOt21O7lTMhDM+X9mB4GX+DZrZtCUJPL/wlcTqxyrx5IvO0IYtILdtrQGQp+8n5S0gwSVmOf9NQrjMOgfQZlIg==",
+      "version": "8.0.2",
+      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-8.0.2.tgz",
+      "integrity": "sha512-6E4xmrTw5wtxnLA5wYL3WDfhZ/1bUBGOXV0zQvVRDOtrR8D0p6W7fs3JweNYhwRYeGvd/1CKX2se0/2s7Q/nJA==",
       "dev": true,
       "dependencies": {
         "esrecurse": "^4.3.0",
         "estraverse": "^5.2.0"
       },
       "engines": {
-        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
         "url": "https://opencollective.com/eslint"
@@ -3231,6 +3222,18 @@
         "concat-map": "0.0.1"
       }
     },
+    "node_modules/eslint/node_modules/eslint-visitor-keys": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-4.0.0.tgz",
+      "integrity": "sha512-OtIRv/2GyiF6o/d8K7MYKKbXrOUBIK6SfkIRM4Z0dY3w+LiQ0vy3F57m0Z71bjbyeiWFiHJ8brqnmE6H6/jEuw==",
+      "dev": true,
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
     "node_modules/eslint/node_modules/is-path-inside": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/is-path-inside/-/is-path-inside-3.0.3.tgz",
@@ -3259,17 +3262,29 @@
       }
     },
     "node_modules/espree": {
-      "version": "9.6.1",
-      "resolved": "https://registry.npmjs.org/espree/-/espree-9.6.1.tgz",
-      "integrity": "sha512-oruZaFkjorTpF32kDSI5/75ViwGeZginGGy2NoOSg3Q9bnwlnmDm4HLnkl0RE3n+njDXR037aY1+x58Z/zFdwQ==",
+      "version": "10.1.0",
+      "resolved": "https://registry.npmjs.org/espree/-/espree-10.1.0.tgz",
+      "integrity": "sha512-M1M6CpiE6ffoigIOWYO9UDP8TMUw9kqb21tf+08IgDYjCsOvCuDt4jQcZmoYxx+w7zlKw9/N0KXfto+I8/FrXA==",
       "dev": true,
       "dependencies": {
-        "acorn": "^8.9.0",
+        "acorn": "^8.12.0",
         "acorn-jsx": "^5.3.2",
-        "eslint-visitor-keys": "^3.4.1"
+        "eslint-visitor-keys": "^4.0.0"
       },
       "engines": {
-        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
+    "node_modules/espree/node_modules/eslint-visitor-keys": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-4.0.0.tgz",
+      "integrity": "sha512-OtIRv/2GyiF6o/d8K7MYKKbXrOUBIK6SfkIRM4Z0dY3w+LiQ0vy3F57m0Z71bjbyeiWFiHJ8brqnmE6H6/jEuw==",
+      "dev": true,
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
         "url": "https://opencollective.com/eslint"
@@ -3620,15 +3635,15 @@
       }
     },
     "node_modules/file-entry-cache": {
-      "version": "6.0.1",
-      "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-6.0.1.tgz",
-      "integrity": "sha512-7Gps/XWymbLk2QLYK4NzpMOrYjMhdIxXuIvy2QBsLE6ljuodKvdkWs/cpyJJ3CVIVpH0Oi1Hvg1ovbMzLdFBBg==",
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-8.0.0.tgz",
+      "integrity": "sha512-XXTUwCvisa5oacNGRP9SfNtYBNAMi+RPwBFmblZEF7N7swHYQS6/Zfk7SRwx4D5j3CH211YNRco1DEMNVfZCnQ==",
       "dev": true,
       "dependencies": {
-        "flat-cache": "^3.0.4"
+        "flat-cache": "^4.0.0"
       },
       "engines": {
-        "node": "^10.12.0 || >=12.0.0"
+        "node": ">=16.0.0"
       }
     },
     "node_modules/fill-range": {
@@ -3660,17 +3675,16 @@
       }
     },
     "node_modules/flat-cache": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-3.2.0.tgz",
-      "integrity": "sha512-CYcENa+FtcUKLmhhqyctpclsq7QF38pKjZHsGNiSQF5r4FtoKDWabFDl3hzaEQMvT1LHEysw5twgLvpYYb4vbw==",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-4.0.1.tgz",
+      "integrity": "sha512-f7ccFPK3SXFHpx15UIGyRJ/FJQctuKZ0zVuN3frBo4HnK3cay9VEW0R6yPYFHC0AgqhukPzKjq22t5DmAyqGyw==",
       "dev": true,
       "dependencies": {
         "flatted": "^3.2.9",
-        "keyv": "^4.5.3",
-        "rimraf": "^3.0.2"
+        "keyv": "^4.5.4"
       },
       "engines": {
-        "node": "^10.12.0 || >=12.0.0"
+        "node": ">=16"
       }
     },
     "node_modules/flatted": {
@@ -3888,15 +3902,12 @@
       }
     },
     "node_modules/globals": {
-      "version": "13.24.0",
-      "resolved": "https://registry.npmjs.org/globals/-/globals-13.24.0.tgz",
-      "integrity": "sha512-AhO5QUcj8llrbG09iWhPU2B204J1xnPeL8kQmVorSsy+Sjj1sk8gIyh6cUocGmH4L0UuhAJy+hJMRA4mgA4mFQ==",
+      "version": "14.0.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
+      "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
       "dev": true,
-      "dependencies": {
-        "type-fest": "^0.20.2"
-      },
       "engines": {
-        "node": ">=8"
+        "node": ">=18"
       },
       "funding": {
         "url": "https://github.com/sponsors/sindresorhus"
@@ -5596,9 +5607,9 @@
       }
     },
     "node_modules/minimatch": {
-      "version": "9.0.4",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.4.tgz",
-      "integrity": "sha512-KqWh+VchfxcMNRAJjj2tnsSJdNbHsVgnkBhTNrW7AjVo6OvLtxw8zfT9oLw1JSohlFzJ8jCoTgaoXvJ+kHt6fw==",
+      "version": "9.0.5",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.5.tgz",
+      "integrity": "sha512-G6T0ZX48xgozx7587koeX9Ys2NYy6Gmv//P89sEte9V9whIapMNF4idKxnW2QtCcLiTWlb/wfCabAtAFWhhBow==",
       "dev": true,
       "dependencies": {
         "brace-expansion": "^2.0.1"
@@ -6163,9 +6174,9 @@
       }
     },
     "node_modules/prettier": {
-      "version": "3.3.2",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.3.2.tgz",
-      "integrity": "sha512-rAVeHYMcv8ATV5d508CFdn+8/pHPpXeIid1DdrPwXnaAdH7cqjVbpJaT5eq4yRAFU/lsbwYwSF/n5iNrdJHPQA==",
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.3.3.tgz",
+      "integrity": "sha512-i2tDNA0O5IrMO757lfrdQZCc2jPNDVntV0m/+4whiDfWaTKfMNgR7Qz0NAeGz/nRqF4m5/6CLzbP4/liHt12Ew==",
       "dev": true,
       "bin": {
         "prettier": "bin/prettier.cjs"
@@ -7253,18 +7264,6 @@
         "node": ">=4"
       }
     },
-    "node_modules/type-fest": {
-      "version": "0.20.2",
-      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.20.2.tgz",
-      "integrity": "sha512-Ne+eE4r0/iWnpAxD852z3A+N0Bt5RN//NjJwRd2VFHEmrywxf5vsZlh4R6lixl6B+wz/8d+maTSAkN1FIkI3LQ==",
-      "dev": true,
-      "engines": {
-        "node": ">=10"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
     "node_modules/typescript": {
       "version": "5.4.5",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.5.tgz",
diff --git a/package.json b/package.json
index 159a57349..05e21706f 100644
--- a/package.json
+++ b/package.json
@@ -51,6 +51,8 @@
   ],
   "license": "Apache-2.0",
   "devDependencies": {
+    "@eslint/eslintrc": "^3.1.0",
+    "@eslint/js": "^9.7.0",
     "@types/diff": "^5.2.1",
     "@types/fs-extra": "^11.0.4",
     "@types/html-minifier-terser": "5.1.1",
@@ -65,14 +67,14 @@
     "@types/temp": "^0.9.4",
     "@types/text-table": "^0.2.5",
     "@types/valid-url": "^1.0.7",
-    "@typescript-eslint/eslint-plugin": "^7.13.1",
-    "@typescript-eslint/parser": "^7.13.1",
+    "@typescript-eslint/eslint-plugin": "^8.0.0-alpha.51",
+    "@typescript-eslint/parser": "^8.0.0-alpha.51",
     "acorn": "^8.12.0",
     "copyfiles": "^2.4.1",
     "del-cli": "^5.1.0",
     "diff": "^5.2.0",
     "diff2html-cli": "^5.2.15",
-    "eslint": "^8.57.0",
+    "eslint": "^9.7.0",
     "eslint-config-prettier": "^9.1.0",
     "extract-zip": "^2.0.1",
     "jest": "^29.7.0",
@@ -80,7 +82,7 @@
     "json-diff": "^1.0.6",
     "nock": "^13.5.4",
     "opener": "^1.5.2",
-    "prettier": "^3.3.2",
+    "prettier": "^3.3.3",
     "ts-jest": "^29.1.5",
     "ts-node": "^10.9.2",
     "typescript": "^5.4.5"
diff --git a/regression/cli.ts b/regression/cli.ts
index 21d96c392..f679ba160 100644
--- a/regression/cli.ts
+++ b/regression/cli.ts
@@ -1,4 +1,3 @@
-/* eslint-disable @typescript-eslint/no-non-null-assertion */
 import path from 'path';
 import fs from 'fs-extra';
 import readlineSync from 'readline-sync';
diff --git a/regression/find.ts b/regression/find.ts
index 086c5a8b7..06c6f536f 100644
--- a/regression/find.ts
+++ b/regression/find.ts
@@ -198,7 +198,7 @@ async function guessDefaultBranch(
         if (res.status === 200) {
           return branch;
         }
-      } catch (e) {
+      } catch {
         // The branch does not exist. Continue.
       }
     }
@@ -215,7 +215,7 @@ async function getReposWithFSHFolder(repos: GHRepo[]): Promise<GHRepo[]> {
         await axios.head(`${repo.html_url}/tree/${repo.default_branch}/${fshyPath}`);
         fshRepos.push(repo);
         break;
-      } catch (e) {
+      } catch {
         // 404: fshy path not found
       }
     }
diff --git a/src/fhirtypes/ElementDefinition.ts b/src/fhirtypes/ElementDefinition.ts
index ec1bfdeb8..8f75c8434 100644
--- a/src/fhirtypes/ElementDefinition.ts
+++ b/src/fhirtypes/ElementDefinition.ts
@@ -79,7 +79,8 @@ import {
 } from '../utils';
 import { InstanceDefinition } from './InstanceDefinition';
 import { idRegex } from './primitiveTypes';
-import sax = require('sax');
+import sax from 'sax';
+
 const PROFILE_ELEMENT_EXTENSION =
   'http://hl7.org/fhir/StructureDefinition/elementdefinition-profile-element';
 
@@ -1576,7 +1577,7 @@ export class ElementDefinition {
         try {
           match = this.findTypeMatch({ type: typeToTry }, rightTypes, fisher);
           matches.push(match);
-        } catch (ex) {
+        } catch {
           // it's okay if a given type doesn't have any matches.
         }
       });
@@ -1788,7 +1789,7 @@ export class ElementDefinition {
       if (vsURI == ce.binding?.valueSet) {
         try {
           ce.bindToVS(vsURI, strength, null, fisher);
-        } catch (ex) {
+        } catch {
           // receiving a BindingStrengthError on a slice is not a problem, because
           // it is fine if the slice has a stronger binding than the list element.
         }
@@ -2092,7 +2093,7 @@ export class ElementDefinition {
           try {
             this.checkAssignedValueAgainstChild(slice, fhirValue);
             this.checkAssignedValueAgainstChildren(slice, fhirValue);
-          } catch (e) {
+          } catch {
             numInvalid += 1;
           }
         });
@@ -2321,7 +2322,7 @@ export class ElementDefinition {
         }
       }
       return sax.parser(true).write(value).error == null;
-    } catch (ex) {
+    } catch {
       return false;
     }
   }
diff --git a/src/fhirtypes/InstanceDefinition.ts b/src/fhirtypes/InstanceDefinition.ts
index 70f3a1c2d..97eb1e85c 100644
--- a/src/fhirtypes/InstanceDefinition.ts
+++ b/src/fhirtypes/InstanceDefinition.ts
@@ -63,6 +63,6 @@ type InstanceMeta = {
   instanceOfUrl?: string;
 };
 
-// eslint-disable-next-line @typescript-eslint/no-empty-interface
+// eslint-disable-next-line @typescript-eslint/no-empty-object-type
 export interface InstanceDefinition extends HasId {}
 applyMixins(InstanceDefinition, [HasId]);
diff --git a/src/import/importConfiguration.ts b/src/import/importConfiguration.ts
index e6da2cd03..0db2e8d4d 100644
--- a/src/import/importConfiguration.ts
+++ b/src/import/importConfiguration.ts
@@ -139,7 +139,7 @@ export function importConfiguration(yaml: YAMLConfiguration | string, file: stri
     title: yaml.title,
     // Default status to 'draft' on FSHOnly IGs so exported resources inherit the property
     status: parseCodeWithRequiredValues(
-      yaml.FSHOnly ? yaml.status ?? 'draft' : required(yaml.status, 'status', file) ?? 'draft',
+      yaml.FSHOnly ? (yaml.status ?? 'draft') : (required(yaml.status, 'status', file) ?? 'draft'),
       ['draft', 'active', 'retired', 'unknown'],
       'status',
       file
@@ -742,10 +742,10 @@ function parseParameters(
   const parameters: ImplementationGuideDefinitionParameter[] = [];
   // copyrightYear and releaseLabel are only required when generating an IG
   const copyrightYear = FSHOnly
-    ? yamlConfig.copyrightYear ?? yamlConfig.copyrightyear
+    ? (yamlConfig.copyrightYear ?? yamlConfig.copyrightyear)
     : required(yamlConfig.copyrightYear ?? yamlConfig.copyrightyear, 'copyrightYear', file);
   const releaseLabel = FSHOnly
-    ? yamlConfig.releaseLabel ?? yamlConfig.releaselabel
+    ? (yamlConfig.releaseLabel ?? yamlConfig.releaselabel)
     : required(yamlConfig.releaseLabel ?? yamlConfig.releaselabel, 'releaseLabel', file);
   if (copyrightYear) {
     parameters.push({
diff --git a/src/utils/Processing.ts b/src/utils/Processing.ts
index 353dd38ab..23cdbc274 100644
--- a/src/utils/Processing.ts
+++ b/src/utils/Processing.ts
@@ -104,7 +104,7 @@ export function hasFshFiles(path: string): boolean {
     fs.statSync(path);
     const files = getFilesRecursive(path).filter(file => file.endsWith('.fsh'));
     return files.length > 0;
-  } catch (error) {
+  } catch {
     return false;
   }
 }
@@ -264,7 +264,7 @@ export async function updateExternalDependencies(config: Configuration): Promise
         try {
           res = await axiosGet(`${process.env.FPL_REGISTRY}/${dep.packageId}`);
           latestVersion = res?.data?.['dist-tags']?.latest;
-        } catch (e) {
+        } catch {
           logger.warn(
             `Could not get version info for package ${dep.packageId} from custom FHIR package registry ${process.env.FPL_REGISTRY}.`
           );
@@ -274,11 +274,11 @@ export async function updateExternalDependencies(config: Configuration): Promise
         try {
           res = await axiosGet(`https://packages.fhir.org/${dep.packageId}`);
           latestVersion = res?.data?.['dist-tags']?.latest;
-        } catch (e) {
+        } catch {
           try {
             res = await axiosGet(`https://packages2.fhir.org/packages/${dep.packageId}`);
             latestVersion = res?.data?.['dist-tags']?.latest;
-          } catch (e) {
+          } catch {
             logger.warn(`Could not get version info for package ${dep.packageId}`);
             return;
           }
@@ -484,7 +484,7 @@ export function fillTank(rawFSHes: RawFSH[], config: Configuration): FSHTank {
 }
 
 export function checkNullValuesOnArray(resource: any, parentName = '', priorPath = ''): void {
-  const resourceName = parentName ? parentName : resource.id ?? resource.name;
+  const resourceName = parentName ? parentName : (resource.id ?? resource.name);
   for (const propertyKey in resource) {
     const property = resource[propertyKey];
     const currentPath = !priorPath ? propertyKey : priorPath.concat(`.${propertyKey}`);
diff --git a/test/export/InstanceExporter.test.ts b/test/export/InstanceExporter.test.ts
index 67f2b0a61..2ff78d280 100644
--- a/test/export/InstanceExporter.test.ts
+++ b/test/export/InstanceExporter.test.ts
@@ -785,7 +785,7 @@ describe('InstanceExporter', () => {
       patientInstance.usage = 'Definition';
 
       const exported = exportInstance(patientInstance);
-      expect(exported.url).toBeUndefined;
+      expect(exported.url).toBeUndefined();
     });
 
     it('should set an extension on meta.profile when no rules set values on meta.profile', () => {
diff --git a/test/fhirtypes/ElementDefinition.assignFshQuantity.test.ts b/test/fhirtypes/ElementDefinition.assignFshQuantity.test.ts
index bc501dd42..933c02ccd 100644
--- a/test/fhirtypes/ElementDefinition.assignFshQuantity.test.ts
+++ b/test/fhirtypes/ElementDefinition.assignFshQuantity.test.ts
@@ -244,13 +244,11 @@ describe('ElementDefinition', () => {
       // with units
       expect(() => {
         status.assignValue(fshQuantity2);
-        // eslint-disable-next-line
       }).toThrow(
         "Cannot assign Quantity value: 1.24 'mm'. Value does not match element type: code"
       );
       expect(() => {
         status.assignValue(fshQuantity2, true);
-        // eslint-disable-next-line
       }).toThrow(
         "Cannot assign Quantity value: 1.24 'mm'. Value does not match element type: code"
       );
diff --git a/test/fhirtypes/ElementDefinition.assignFshRatio.test.ts b/test/fhirtypes/ElementDefinition.assignFshRatio.test.ts
index ceaa28d79..97fbcad81 100644
--- a/test/fhirtypes/ElementDefinition.assignFshRatio.test.ts
+++ b/test/fhirtypes/ElementDefinition.assignFshRatio.test.ts
@@ -200,13 +200,11 @@ describe('ElementDefinition', () => {
       expect(() => {
         status.assignValue(fshRatio);
       }).toThrow(
-        // eslint-disable-next-line
         "Cannot assign Ratio value: 1.2 'mm' : 3.4 'cm'. Value does not match element type: code"
       );
       expect(() => {
         status.assignValue(fshRatio, true);
       }).toThrow(
-        // eslint-disable-next-line
         "Cannot assign Ratio value: 1.2 'mm' : 3.4 'cm'. Value does not match element type: code"
       );
       // without units
diff --git a/test/fhirtypes/ElementDefinition.assignString.test.ts b/test/fhirtypes/ElementDefinition.assignString.test.ts
index 262555d04..003a4d6da 100644
--- a/test/fhirtypes/ElementDefinition.assignString.test.ts
+++ b/test/fhirtypes/ElementDefinition.assignString.test.ts
@@ -1189,7 +1189,7 @@ describe('ElementDefinition', () => {
       const narrativeDiv = patient.findElementByPath('text.div', fisher);
       try {
         narrativeDiv.assignValue('<piv xmlns="http://www.w3.org/1999/xhtml">Twas brillig</div>');
-      } catch (error) {
+      } catch {
         didThrow = true;
         expect(loggerSpy.getLastMessage('warn')).toMatch(
           'xhtml div elements should start and end with <div> tags for Patient.text.div'
diff --git a/test/ig/IGExporter.IG.test.ts b/test/ig/IGExporter.IG.test.ts
index a4c47cc59..b1f83ca1d 100644
--- a/test/ig/IGExporter.IG.test.ts
+++ b/test/ig/IGExporter.IG.test.ts
@@ -2025,7 +2025,6 @@ describe('IGExporter', () => {
         reference: {
           reference: 'ValueSet/MyVS'
         },
-        // eslint-disable-next-line
         name: "Yes/No/Don't Know", // Use name over ID
         exampleBoolean: false
       });
diff --git a/test/import/FSHTank.test.ts b/test/import/FSHTank.test.ts
index 40b12a171..43f9100f0 100644
--- a/test/import/FSHTank.test.ts
+++ b/test/import/FSHTank.test.ts
@@ -1023,7 +1023,7 @@ describe('FSHTank', () => {
       profile.id = 'ip4';
       profile.parent = 'Patient';
       addNamedImposeProfileExtension(profile, 'http://example.org/imposedProfileA', 0, '$IMPOSE');
-      addNamedImposeProfileExtension(profile, 'http://example.org/imposedProfileB', 1), '$IMPOSE';
+      addNamedImposeProfileExtension(profile, 'http://example.org/imposedProfileB', 1, '$IMPOSE');
       const doc4 = new FSHDocument('doc4.fsh');
       doc4.aliases.set(
         '$IMPOSE',
diff --git a/test/utils/PathUtils.test.ts b/test/utils/PathUtils.test.ts
index 5f89347b2..bc8225024 100644
--- a/test/utils/PathUtils.test.ts
+++ b/test/utils/PathUtils.test.ts
@@ -3,9 +3,13 @@ import { readJSONSync } from 'fs-extra';
 import { InstanceDefinition } from '../../src/fhirtypes';
 import { CaretValueRule, Rule, AssignmentRule } from '../../src/fshtypes/rules';
 import { resolveSoftIndexing, parseFSHPath, collectValuesAtElementIdOrPath } from '../../src/utils';
-import '../testhelpers/loggerSpy'; // side-effect: suppresses logs
+import { loggerSpy } from '../testhelpers/loggerSpy';
 
 describe('PathUtils', () => {
+  beforeEach(() => {
+    loggerSpy.reset();
+  });
+
   describe('#resolveSoftIndexing', () => {
     it('should resolve simple (non-nested) soft indexing', () => {
       const rules = ['name[+]', 'name[=]', 'name[=]', 'name[+]', 'name[=]'].map(r => new Rule(r));
@@ -136,11 +140,8 @@ describe('PathUtils', () => {
       ]);
     });
 
-    it('should resolve improper soft indexing, but throw an error', () => {
+    it('should resolve improper soft indexing, but log an error', () => {
       const rules = ['name[=]', 'name[=]', 'name[=]', 'name[+]', 'name[=]'].map(r => new Rule(r));
-      expect(() => {
-        resolveSoftIndexing(rules);
-      }).toThrowError;
       resolveSoftIndexing(rules);
       expect(rules.map(r => r.path)).toEqual([
         'name[0]',
@@ -149,6 +150,9 @@ describe('PathUtils', () => {
         'name[1]',
         'name[1]'
       ]);
+      expect(loggerSpy.getLastMessage('error')).toMatch(
+        'The first index in a Soft Indexing sequence must be "+", an actual index of "0" has been assumed'
+      );
     });
 
     it('should resolve soft indexing beginning with a non-zero index', () => {
diff --git a/test/utils/Processing.test.ts b/test/utils/Processing.test.ts
index a5461f4a9..9c4553b62 100644
--- a/test/utils/Processing.test.ts
+++ b/test/utils/Processing.test.ts
@@ -2773,7 +2773,7 @@ describe('Processing', () => {
       mockedAxios.get.mockImplementationOnce(() => Promise.resolve(data));
 
       const version = await getLatestSushiVersion();
-      expect(version).toBeUndefined;
+      expect(version).toBeUndefined();
       // Loosely match message since it differs slightly between npm 6 and npm 8
       expect(loggerSpy.getLastMessage('warn')).toMatch(
         /Unable to determine the latest version of sushi: Cannot read .*'dist-tags'.*/