diff --git a/biome.jsonc b/biome.jsonc
index 98e77eb6eb5..637eb2daafd 100644
--- a/biome.jsonc
+++ b/biome.jsonc
@@ -38,7 +38,18 @@
   },
 
   // TODO: Configure and enable import sorting
-  "assist": { "actions": { "source": { "organizeImports": "off" } } },
+  "assist": {
+    "actions": {
+      "source": {
+        "organizeImports": {
+          "level": "off",
+          "options": {
+            "groups": []
+          }
+        }
+      }
+    }
+  },
   "linter": {
     "enabled": true,
     "rules": {
@@ -53,7 +64,8 @@
           "fix": "safe"
         },
         "noUnusedFunctionParameters": "error",
-        "noUnusedLabels": "error"
+        "noUnusedLabels": "error",
+        "noPrivateImports": "error"
       },
       "style": {
         "useEnumInitializers": "off", // large enums like Moves/Species would make this cumbersome
@@ -108,16 +120,37 @@
         "noUselessSwitchCase": "off", // Explicit > Implicit
         "noUselessConstructor": "error",
         "noBannedTypes": "warn", // TODO: Refactor and make this an error
-        "noThisInStatic": "error"
+        "noThisInStatic": "error",
+        "noUselessThisAlias": "error",
+        "noUselessTernary": "error"
       },
       "performance": {
         "noNamespaceImport": "error",
         "noDelete": "error"
+      },
+      "nursery": {
+        "useAdjacentGetterSetter": "warn",
+        "noConstantBinaryExpression": "warn",
+        "noTsIgnore": "warn",
+        "noAwaitInLoop": "warn",
+        "useJsonImportAttribute": "error",
+        "useIndexOf": "warn",
+        "useObjectSpread": "info",
+        "useNumericSeparators": "info",
+        "useIterableCallbackReturn": "warn",
+        "useSingleJsDocAsterisk": "warn",
+        "noShadow": "warn"
       }
     }
   },
   "javascript": {
-    "formatter": { "quoteStyle": "double", "arrowParentheses": "asNeeded" }
+    "formatter": {
+      "quoteStyle": "double",
+      "arrowParentheses": "asNeeded"
+    },
+    "parser": {
+      "jsxEverywhere": false
+    }
   },
   "overrides": [
     {
@@ -130,6 +163,9 @@
           },
           "style": {
             "noNonNullAssertion": "off"
+          },
+          "nursery": {
+            "noFloatingPromises": "error"
           }
         }
       }
diff --git a/src/plugins/i18n.ts b/src/plugins/i18n.ts
index 7d3b30ed5b0..470aeaf69b7 100644
--- a/src/plugins/i18n.ts
+++ b/src/plugins/i18n.ts
@@ -3,7 +3,7 @@ import i18next from "i18next";
 import LanguageDetector from "i18next-browser-languagedetector";
 import HttpBackend from "i18next-http-backend";
 import processor, { KoreanPostpositionProcessor } from "i18next-korean-postposition-processor";
-import pkg from "../../package.json";
+import pkg from "../../package.json" with { type: "json" };
 
 //#region Interfaces/Types
 
diff --git a/src/ui/daily-run-scoreboard.ts b/src/ui/daily-run-scoreboard.ts
index e19882b09cc..c069c6fffd7 100644
--- a/src/ui/daily-run-scoreboard.ts
+++ b/src/ui/daily-run-scoreboard.ts
@@ -41,24 +41,15 @@ export class DailyRunScoreboard extends Phaser.GameObjects.Container {
     this.setup();
   }
 
-  /**
-   * Sets the updating state and updates button states accordingly.
-   * If value is true (updating), disables the buttons; if false, enables the buttons.
-   * @param {boolean} value - The new updating state.
-   */
-  set isUpdating(value) {
+  /** When set to `true`, disables the buttons; when set to `false`, enables the buttons. */
+  get isUpdating(): boolean {
+    return this._isUpdating;
+  }
+  set isUpdating(value: boolean) {
     this._isUpdating = value;
     this.setButtonsState(!value);
   }
 
-  /**
-   * Gets the current updating state.
-   * @returns {boolean} - The current updating state.
-   */
-  get isUpdating() {
-    return this._isUpdating;
-  }
-
   setup() {
     const titleWindow = addWindow(0, 0, 114, 18, false, false, undefined, undefined, WindowVariant.THIN);
     this.add(titleWindow);
diff --git a/test/sprites/pokemonSprite.test.ts b/test/sprites/pokemonSprite.test.ts
index a008b75b42e..bd65d86d22a 100644
--- a/test/sprites/pokemonSprite.test.ts
+++ b/test/sprites/pokemonSprite.test.ts
@@ -2,8 +2,8 @@ import { getAppRootDir } from "#test/sprites/spritesUtils";
 import fs from "fs";
 import path from "path";
 import { beforeAll, describe, expect, it } from "vitest";
-import _masterlist from "../../public/images/pokemon/variant/_masterlist.json";
-import _exp_masterlist from "../../public/images/pokemon/variant/_exp_masterlist.json";
+import _masterlist from "../../public/images/pokemon/variant/_masterlist.json" with { type: "json" };
+import _exp_masterlist from "../../public/images/pokemon/variant/_exp_masterlist.json" with { type: "json" };
 
 type PokemonVariantMasterlist = typeof _masterlist;
 type PokemonExpVariantMasterlist = typeof _exp_masterlist;
@@ -26,9 +26,9 @@ describe("check if every variant's sprite are correctly set", () => {
     femaleVariant = masterlist.female;
     backVariant = masterlist.back;
 
-    // @ts-ignore
+    // @ts-expect-error
     delete masterlist.female; // TODO: resolve ts-ignore
-    //@ts-ignore
+    //@ts-expect-error
     delete masterlist.back; //TODO: resolve ts-ignore
   });