diff --git a/packages/eslint-config/README.md b/packages/eslint-config/README.md
new file mode 100644
index 0000000..8b42d90
--- /dev/null
+++ b/packages/eslint-config/README.md
@@ -0,0 +1,3 @@
+# `@turbo/eslint-config`
+
+Collection of internal eslint configurations.
diff --git a/packages/eslint-config/base.js b/packages/eslint-config/base.js
new file mode 100644
index 0000000..09d316e
--- /dev/null
+++ b/packages/eslint-config/base.js
@@ -0,0 +1,32 @@
+import js from "@eslint/js";
+import eslintConfigPrettier from "eslint-config-prettier";
+import turboPlugin from "eslint-plugin-turbo";
+import tseslint from "typescript-eslint";
+import onlyWarn from "eslint-plugin-only-warn";
+
+/**
+ * A shared ESLint configuration for the repository.
+ *
+ * @type {import("eslint").Linter.Config[]}
+ * */
+export const config = [
+  js.configs.recommended,
+  eslintConfigPrettier,
+  ...tseslint.configs.recommended,
+  {
+    plugins: {
+      turbo: turboPlugin,
+    },
+    rules: {
+      "turbo/no-undeclared-env-vars": "warn",
+    },
+  },
+  {
+    plugins: {
+      onlyWarn,
+    },
+  },
+  {
+    ignores: ["dist/**"],
+  },
+];
diff --git a/packages/eslint-config/next.js b/packages/eslint-config/next.js
new file mode 100644
index 0000000..4df088a
--- /dev/null
+++ b/packages/eslint-config/next.js
@@ -0,0 +1,57 @@
+import js from "@eslint/js";
+import { globalIgnores } from "eslint/config";
+import eslintConfigPrettier from "eslint-config-prettier";
+import tseslint from "typescript-eslint";
+import pluginReactHooks from "eslint-plugin-react-hooks";
+import pluginReact from "eslint-plugin-react";
+import globals from "globals";
+import pluginNext from "@next/eslint-plugin-next";
+import { config as baseConfig } from "./base.js";
+
+/**
+ * A custom ESLint configuration for libraries that use Next.js.
+ *
+ * @type {import("eslint").Linter.Config[]}
+ * */
+export const nextJsConfig = [
+  ...baseConfig,
+  js.configs.recommended,
+  eslintConfigPrettier,
+  ...tseslint.configs.recommended,
+  globalIgnores([
+    // Default ignores of eslint-config-next:
+    ".next/**",
+    "out/**",
+    "build/**",
+    "next-env.d.ts",
+  ]),
+  {
+    ...pluginReact.configs.flat.recommended,
+    languageOptions: {
+      ...pluginReact.configs.flat.recommended.languageOptions,
+      globals: {
+        ...globals.serviceworker,
+      },
+    },
+  },
+  {
+    plugins: {
+      "@next/next": pluginNext,
+    },
+    rules: {
+      ...pluginNext.configs.recommended.rules,
+      ...pluginNext.configs["core-web-vitals"].rules,
+    },
+  },
+  {
+    plugins: {
+      "react-hooks": pluginReactHooks,
+    },
+    settings: { react: { version: "detect" } },
+    rules: {
+      ...pluginReactHooks.configs.recommended.rules,
+      // React scope no longer necessary with new JSX transform.
+      "react/react-in-jsx-scope": "off",
+    },
+  },
+];
diff --git a/packages/eslint-config/package.json b/packages/eslint-config/package.json
new file mode 100644
index 0000000..6cc37f9
--- /dev/null
+++ b/packages/eslint-config/package.json
@@ -0,0 +1,24 @@
+{
+  "name": "@repo/eslint-config",
+  "version": "0.0.0",
+  "type": "module",
+  "private": true,
+  "exports": {
+    "./base": "./base.js",
+    "./next-js": "./next.js",
+    "./react-internal": "./react-internal.js"
+  },
+  "devDependencies": {
+    "@eslint/js": "^9.39.1",
+    "@next/eslint-plugin-next": "^15.5.0",
+    "eslint": "^9.39.1",
+    "eslint-config-prettier": "^10.1.1",
+    "eslint-plugin-only-warn": "^1.1.0",
+    "eslint-plugin-react": "^7.37.5",
+    "eslint-plugin-react-hooks": "^5.2.0",
+    "eslint-plugin-turbo": "^2.7.1",
+    "globals": "^16.5.0",
+    "typescript": "^5.9.2",
+    "typescript-eslint": "^8.50.0"
+  }
+}
diff --git a/packages/eslint-config/react-internal.js b/packages/eslint-config/react-internal.js
new file mode 100644
index 0000000..daeccba
--- /dev/null
+++ b/packages/eslint-config/react-internal.js
@@ -0,0 +1,39 @@
+import js from "@eslint/js";
+import eslintConfigPrettier from "eslint-config-prettier";
+import tseslint from "typescript-eslint";
+import pluginReactHooks from "eslint-plugin-react-hooks";
+import pluginReact from "eslint-plugin-react";
+import globals from "globals";
+import { config as baseConfig } from "./base.js";
+
+/**
+ * A custom ESLint configuration for libraries that use React.
+ *
+ * @type {import("eslint").Linter.Config[]} */
+export const config = [
+  ...baseConfig,
+  js.configs.recommended,
+  eslintConfigPrettier,
+  ...tseslint.configs.recommended,
+  pluginReact.configs.flat.recommended,
+  {
+    languageOptions: {
+      ...pluginReact.configs.flat.recommended.languageOptions,
+      globals: {
+        ...globals.serviceworker,
+        ...globals.browser,
+      },
+    },
+  },
+  {
+    plugins: {
+      "react-hooks": pluginReactHooks,
+    },
+    settings: { react: { version: "detect" } },
+    rules: {
+      ...pluginReactHooks.configs.recommended.rules,
+      // React scope no longer necessary with new JSX transform.
+      "react/react-in-jsx-scope": "off",
+    },
+  },
+];
diff --git a/packages/typescript-config/base.json b/packages/typescript-config/base.json
new file mode 100644
index 0000000..5117f2a
--- /dev/null
+++ b/packages/typescript-config/base.json
@@ -0,0 +1,19 @@
+{
+  "$schema": "https://json.schemastore.org/tsconfig",
+  "compilerOptions": {
+    "declaration": true,
+    "declarationMap": true,
+    "esModuleInterop": true,
+    "incremental": false,
+    "isolatedModules": true,
+    "lib": ["es2022", "DOM", "DOM.Iterable"],
+    "module": "NodeNext",
+    "moduleDetection": "force",
+    "moduleResolution": "NodeNext",
+    "noUncheckedIndexedAccess": true,
+    "resolveJsonModule": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "target": "ES2022"
+  }
+}
diff --git a/packages/typescript-config/nextjs.json b/packages/typescript-config/nextjs.json
new file mode 100644
index 0000000..964f190
--- /dev/null
+++ b/packages/typescript-config/nextjs.json
@@ -0,0 +1,14 @@
+{
+  "$schema": "https://json.schemastore.org/tsconfig",
+  "extends": "./base.json",
+  "compilerOptions": {
+    "plugins": [{ "name": "next" }],
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "allowJs": true,
+    "jsx": "preserve",
+    "noEmit": true,
+    "declaration": false,
+    "declarationMap": false
+  }
+}
diff --git a/packages/typescript-config/package.json b/packages/typescript-config/package.json
new file mode 100644
index 0000000..27c0e60
--- /dev/null
+++ b/packages/typescript-config/package.json
@@ -0,0 +1,9 @@
+{
+  "name": "@repo/typescript-config",
+  "version": "0.0.0",
+  "private": true,
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  }
+}
diff --git a/packages/typescript-config/react-library.json b/packages/typescript-config/react-library.json
new file mode 100644
index 0000000..c3a1b26
--- /dev/null
+++ b/packages/typescript-config/react-library.json
@@ -0,0 +1,7 @@
+{
+  "$schema": "https://json.schemastore.org/tsconfig",
+  "extends": "./base.json",
+  "compilerOptions": {
+    "jsx": "react-jsx"
+  }
+}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 451a993..798eb78 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -231,6 +231,44 @@ importers:
         specifier: ^4.0.0
         version: 4.3.4
 
+  packages/eslint-config:
+    devDependencies:
+      '@eslint/js':
+        specifier: ^9.39.1
+        version: 9.39.2
+      '@next/eslint-plugin-next':
+        specifier: ^15.5.0
+        version: 15.5.12
+      eslint:
+        specifier: ^9.39.1
+        version: 9.39.1(jiti@2.6.1)
+      eslint-config-prettier:
+        specifier: ^10.1.1
+        version: 10.1.8(eslint@9.39.1(jiti@2.6.1))
+      eslint-plugin-only-warn:
+        specifier: ^1.1.0
+        version: 1.2.1
+      eslint-plugin-react:
+        specifier: ^7.37.5
+        version: 7.37.5(eslint@9.39.1(jiti@2.6.1))
+      eslint-plugin-react-hooks:
+        specifier: ^5.2.0
+        version: 5.2.0(eslint@9.39.1(jiti@2.6.1))
+      eslint-plugin-turbo:
+        specifier: ^2.7.1
+        version: 2.8.16(eslint@9.39.1(jiti@2.6.1))(turbo@2.7.2)
+      globals:
+        specifier: ^16.5.0
+        version: 16.5.0
+      typescript:
+        specifier: ^5.9.2
+        version: 5.9.2
+      typescript-eslint:
+        specifier: ^8.50.0
+        version: 8.51.0(eslint@9.39.1(jiti@2.6.1))(typescript@5.9.2)
+
+  packages/typescript-config: {}
+
 packages:
 
   '@alloc/quick-lru@5.2.0':
@@ -1044,6 +1082,9 @@ packages:
   '@next/env@16.1.1':
     resolution: {integrity: sha512-3oxyM97Sr2PqiVyMyrZUtrtM3jqqFxOQJVuKclDsgj/L728iZt/GyslkN4NwarledZATCenbk4Offjk1hQmaAA==}
 
+  '@next/eslint-plugin-next@15.5.12':
+    resolution: {integrity: sha512-+ZRSDFTv4aC96aMb5E41rMjysx8ApkryevnvEYZvPZO52KvkqP5rNExLUXJFr9P4s0f3oqNQR6vopCZsPWKDcQ==}
+
   '@next/eslint-plugin-next@16.1.1':
     resolution: {integrity: sha512-Ovb/6TuLKbE1UiPcg0p39Ke3puyTCIKN9hGbNItmpQsp+WX3qrjO3WaMVSi6JHr9X1NrmthqIguVHodMJbh/dw==}
 
@@ -2608,6 +2649,10 @@ packages:
   dom-helpers@5.2.1:
     resolution: {integrity: sha512-nRCa7CK3VTrM2NmGkIy4cbK7IZlgBE/PYMn55rrXefr5xXDP0LdtfPnblFDoVdcAfslJ7or6iqAUnx0CCGIWQA==}
 
+  dotenv@16.0.3:
+    resolution: {integrity: sha512-7GO6HghkA5fYG9TYnNxi14/7K9f5occMlp3zXAuSxn7CKCxt9xbNWG7yF8hTCSUchlfWSe3uLmlPfigevRItzQ==}
+    engines: {node: '>=12'}
+
   dotenv@17.2.3:
     resolution: {integrity: sha512-JVUnt+DUIzu87TABbhPmNfVdBDt18BLOWjMUFJMSi/Qqg7NTYtabbvSNJGOJ7afbRuv9D/lngizHtP7QyLQ+9w==}
     engines: {node: '>=12'}
@@ -2734,6 +2779,12 @@ packages:
       typescript:
         optional: true
 
+  eslint-config-prettier@10.1.8:
+    resolution: {integrity: sha512-82GZUjRS0p/jganf6q1rEO25VSoHH0hKPCTrgillPjdI/3bgBhAE1QzHrHTizjpRvy6pGAvKjDJtk2pF9NDq8w==}
+    hasBin: true
+    peerDependencies:
+      eslint: '>=7.0.0'
+
   eslint-import-resolver-node@0.3.9:
     resolution: {integrity: sha512-WFj2isz22JahUv+B788TlO3N6zL3nNJGU8CcZbPZvVEkBPaJdCV4vy5wyghty5ROFbCRnm132v8BScu5/1BQ8g==}
 
@@ -2787,6 +2838,15 @@ packages:
     peerDependencies:
       eslint: ^3 || ^4 || ^5 || ^6 || ^7 || ^8 || ^9
 
+  eslint-plugin-only-warn@1.2.1:
+    resolution: {integrity: sha512-j37hwfaQDEOfkZ1Dpvu/HnWLavlzQxQxfbrU/9Jb4R9qzrE1eTYuRJyrxq7LzLRI8miG5FOV6veoUVhx7AI84w==}
+
+  eslint-plugin-react-hooks@5.2.0:
+    resolution: {integrity: sha512-+f15FfK64YQwZdJNELETdn5ibXEUQmW1DZL6KXhNnc2heoy/sg9VJJeT7n8TlMWouzWqSWavFkIhHyIbIAEapg==}
+    engines: {node: '>=10'}
+    peerDependencies:
+      eslint: ^3.0.0 || ^4.0.0 || ^5.0.0 || ^6.0.0 || ^7.0.0 || ^8.0.0-0 || ^9.0.0
+
   eslint-plugin-react-hooks@7.0.1:
     resolution: {integrity: sha512-O0d0m04evaNzEPoSW+59Mezf8Qt0InfgGIBJnpC0h3NH/WjUAR7BIKUfysC6todmtiZ/A0oUVS8Gce0WhBrHsA==}
     engines: {node: '>=18'}
@@ -2799,6 +2859,12 @@ packages:
     peerDependencies:
       eslint: ^3 || ^4 || ^5 || ^6 || ^7 || ^8 || ^9.7
 
+  eslint-plugin-turbo@2.8.16:
+    resolution: {integrity: sha512-fhvTLe0PnyV72npfBi/IwwVMzkTnUw9MxS2S2Q0Oo1aed7woAtHwSL5DEdTTV6tXZSKbqRHaIbjV6rwx+1iRYA==}
+    peerDependencies:
+      eslint: '>6.6.0'
+      turbo: '>2.0.0'
+
   eslint-scope@8.4.0:
     resolution: {integrity: sha512-sNXOfKCn74rt8RICKMvJS7XKV/Xk9kA7DyJr8mJik3S7Cwgy3qlkkmyS2uQB3jiJg6VNdZd/pDBJu0nvG2NlTg==}
     engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
@@ -3174,6 +3240,10 @@ packages:
     resolution: {integrity: sha512-ob/2LcVVaVGCYN+r14cnwnoDPUufjiYgSqRhiFD0Q1iI4Odora5RE8Iv1D24hAz5oMophRGkGz+yuvQmmUMnMw==}
     engines: {node: '>=18'}
 
+  globals@16.5.0:
+    resolution: {integrity: sha512-c/c15i26VrJ4IRt5Z89DnIzCGDn9EcebibhAOjw5ibqEHsE1wLUgkPn9RDmNcUKyU87GeaL633nyJ+pplFR2ZQ==}
+    engines: {node: '>=18'}
+
   globalthis@1.0.4:
     resolution: {integrity: sha512-DpLKbNU4WylpxJykQujfCcwYWiV/Jhm50Goo0wrVILAv5jOr9d+H+UR3PhSCD2rCCEIg0uc+G+muBTwD54JhDQ==}
     engines: {node: '>= 0.4'}
@@ -6205,6 +6275,10 @@ snapshots:
 
   '@next/env@16.1.1': {}
 
+  '@next/eslint-plugin-next@15.5.12':
+    dependencies:
+      fast-glob: 3.3.1
+
   '@next/eslint-plugin-next@16.1.1':
     dependencies:
       fast-glob: 3.3.1
@@ -7626,6 +7700,8 @@ snapshots:
       '@babel/runtime': 7.28.4
       csstype: 3.1.3
 
+  dotenv@16.0.3: {}
+
   dotenv@17.2.3: {}
 
   dunder-proto@1.0.1:
@@ -7853,6 +7929,10 @@ snapshots:
       - eslint-plugin-import-x
       - supports-color
 
+  eslint-config-prettier@10.1.8(eslint@9.39.1(jiti@2.6.1)):
+    dependencies:
+      eslint: 9.39.1(jiti@2.6.1)
+
   eslint-import-resolver-node@0.3.9:
     dependencies:
       debug: 3.2.7
@@ -7935,6 +8015,12 @@ snapshots:
       safe-regex-test: 1.1.0
       string.prototype.includes: 2.0.1
 
+  eslint-plugin-only-warn@1.2.1: {}
+
+  eslint-plugin-react-hooks@5.2.0(eslint@9.39.1(jiti@2.6.1)):
+    dependencies:
+      eslint: 9.39.1(jiti@2.6.1)
+
   eslint-plugin-react-hooks@7.0.1(eslint@9.39.1(jiti@2.6.1)):
     dependencies:
       '@babel/core': 7.28.5
@@ -7968,6 +8054,12 @@ snapshots:
       string.prototype.matchall: 4.0.12
       string.prototype.repeat: 1.0.0
 
+  eslint-plugin-turbo@2.8.16(eslint@9.39.1(jiti@2.6.1))(turbo@2.7.2):
+    dependencies:
+      dotenv: 16.0.3
+      eslint: 9.39.1(jiti@2.6.1)
+      turbo: 2.7.2
+
   eslint-scope@8.4.0:
     dependencies:
       esrecurse: 4.3.0
@@ -8442,6 +8534,8 @@ snapshots:
 
   globals@16.4.0: {}
 
+  globals@16.5.0: {}
+
   globalthis@1.0.4:
     dependencies:
       define-properties: 1.2.1