diff --git a/biome.jsonc b/biome.jsonc
index 35a458d2933..d4cb67d33a6 100644
--- a/biome.jsonc
+++ b/biome.jsonc
@@ -19,6 +19,7 @@
     // and having to verify whether each individual file is ignored
     "includes": [
       "**",
+      "!**/*.d.ts",
       "!**/dist/**/*",
       "!**/build/**/*",
       "!**/coverage/**/*",
@@ -176,10 +177,9 @@
       }
     },
 
-    // Overrides to prevent unused import removal inside `overrides.ts` and enums files (for TSDoc linkcodes),
-    // as well as in all boilerplate files
+    // Overrides to prevent unused import removal inside `overrides.ts` and enums files (for TSDoc linkcodes)
     {
-      "includes": ["**/src/overrides.ts", "**/src/enums/**/*", "**/*.boilerplate.ts", "**/*.d.ts"],
+      "includes": ["**/src/overrides.ts", "**/src/enums/**/*"],
       "linter": {
         "rules": {
           "correctness": {
@@ -189,7 +189,7 @@
       }
     },
     {
-      "includes": ["**/src/overrides.ts", "**/scripts/**/*.ts"],
+      "includes": ["**/src/overrides.ts"],
       "linter": {
         "rules": {
           "style": {
diff --git a/scripts/biome.jsonc b/scripts/biome.jsonc
new file mode 100644
index 00000000000..848e2a87184
--- /dev/null
+++ b/scripts/biome.jsonc
@@ -0,0 +1,38 @@
+{
+  "$schema": "https://biomejs.dev/schemas/2.0.0/schema.json",
+  // extend from base config in root dir
+  "extends": "//",
+  "files": {
+    "includes": ["**/*.{js,ts,jsx,tsx}"]
+  },
+  "linter": {
+    "rules": {
+      "style": {
+        // Unfortunately, TS does not support multiple configs, so we need to have Biome pull the slack
+        // and effectively enforce `noErasableSyntax`
+        "noEnum": "error",
+        "noNamespace": "error",
+        "noNonNullAssertion": "error", // TODO: Remove once added to main config
+        "useForOf": "error" // TODO: Move to main config
+      },
+      "suspicious": {
+        "noImplicitAnyLet": "error"
+      }
+    }
+  },
+  "overrides": [
+    // Prevent unused import removal inside boilerplate files.
+    // These are unused in the file themselves, but will become used once copied and converted to actual TS files.
+    // (If not, the generated files will themselves produce errors.)
+    {
+      "includes": ["**/*.boilerplate.ts", "**/boilerplates/*.ts"], // TODO: Rename existing boilerplates in the folder and remove this 2nd alias
+      "linter": {
+        "rules": {
+          "correctness": {
+            "noUnusedImports": "off"
+          }
+        }
+      }
+    }
+  ]
+}
diff --git a/scripts/jsconfig.json b/scripts/jsconfig.json
new file mode 100644
index 00000000000..34a18a515e7
--- /dev/null
+++ b/scripts/jsconfig.json
@@ -0,0 +1,12 @@
+{
+  "extends": "../tsconfig",
+  "include": ["**/*.{js,jsx}"],
+  "compilerOptions": {
+    "checkJs": true,
+    "target": "esnext",
+    "module": "nodenext",
+    "moduleResolution": "nodenext",
+    "erasableSyntaxOnly": true,
+    "strict": true
+  }
+}
diff --git a/tsconfig.json b/tsconfig.json
index 9b6a912bac7..0338c306d49 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -18,7 +18,6 @@
     "esModuleInterop": true,
     "strictNullChecks": true,
     "sourceMap": false,
-    "checkJs": true,
     "strict": false, // TODO: Enable this eventually
     "rootDir": ".",
     "outDir": "./build",
@@ -55,9 +54,9 @@
       "#utils/*": ["./src/utils/*.ts"],
       "#data/*": ["./src/data/pokemon-forms/*.ts", "./src/data/pokemon/*.ts", "./src/data/*.ts"],
       "#test/*": ["./test/*.ts"],
-      "#app/*": ["./src/*.ts"],
-      "#scripts/*": ["./scripts/*.ts"]
+      "#app/*": ["./src/*.ts"]
     }
   },
-  "exclude": ["scripts", "node_modules", "dist", "vite.config.ts", "vitest.config.ts", "vitest.workspace.ts"]
+  "include": ["**/*.{ts,tsx}"],
+  "exclude": ["node_modules", "dist", "vite.config.ts", "vitest.config.ts", "vitest.workspace.ts"]
 }