diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 386ab5907..0babade7a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -75,6 +75,16 @@ jobs:
               run: |
                   npm run test:types
 
+            - name: Test types (object-schema)
+              working-directory: packages/object-schema
+              run: |
+                  npm run test:types
+
+            - name: Test types (config-array)
+              working-directory: packages/config-array
+              run: |
+                  npm run test:types
+
             - name: Test types (config-helpers)
               working-directory: packages/config-helpers
               run: |
diff --git a/packages/config-array/package.json b/packages/config-array/package.json
index c5203223f..26347befc 100644
--- a/packages/config-array/package.json
+++ b/packages/config-array/package.json
@@ -36,10 +36,11 @@
     "build:cts": "node ../../tools/build-cts.js dist/esm/index.d.ts dist/cjs/index.d.cts",
     "build:std__path": "rollup -c rollup.std__path-config.js && node fix-std__path-imports",
     "build": "rollup -c && npm run build:dedupe-types && tsc -p tsconfig.esm.json && npm run build:cts && npm run build:std__path",
-    "test:jsr": "npx jsr@latest publish --dry-run",
     "pretest": "npm run build",
     "test": "mocha \"tests/**/*.test.js\"",
-    "test:coverage": "c8 npm test"
+    "test:coverage": "c8 npm test",
+    "test:jsr": "npx jsr@latest publish --dry-run",
+    "test:types": "tsc -p tests/types/tsconfig.json"
   },
   "keywords": [
     "configuration",
diff --git a/packages/config-array/rollup.config.js b/packages/config-array/rollup.config.js
index 03a11e126..5b813a884 100644
--- a/packages/config-array/rollup.config.js
+++ b/packages/config-array/rollup.config.js
@@ -16,7 +16,7 @@ export default {
 	plugins: [
 		copy({
 			targets: [
-				{ src: "src/types.ts", dest: "dist/cjs" },
+				{ src: "src/types.ts", dest: "dist/cjs", rename: "types.cts" },
 				{ src: "src/types.ts", dest: "dist/esm" },
 			],
 		}),
diff --git a/packages/config-array/rollup.std__path-config.js b/packages/config-array/rollup.std__path-config.js
index 2a9317ec7..44912051b 100644
--- a/packages/config-array/rollup.std__path-config.js
+++ b/packages/config-array/rollup.std__path-config.js
@@ -7,10 +7,12 @@ export default [
 		input: resolve("@jsr/std__path/posix"),
 		output: [
 			{
+				banner: "// @ts-nocheck",
 				file: "./dist/cjs/std__path/posix.cjs",
 				format: "cjs",
 			},
 			{
+				banner: "// @ts-nocheck",
 				file: "./dist/esm/std__path/posix.js",
 				format: "esm",
 			},
@@ -20,10 +22,12 @@ export default [
 		input: resolve("@jsr/std__path/windows"),
 		output: [
 			{
+				banner: "// @ts-nocheck",
 				file: "./dist/cjs/std__path/windows.cjs",
 				format: "cjs",
 			},
 			{
+				banner: "// @ts-nocheck",
 				file: "./dist/esm/std__path/windows.js",
 				format: "esm",
 			},
diff --git a/packages/config-array/src/config-array.js b/packages/config-array/src/config-array.js
index 075cef701..cbd373ba8 100644
--- a/packages/config-array/src/config-array.js
+++ b/packages/config-array/src/config-array.js
@@ -20,12 +20,10 @@ import { filesAndIgnoresSchema } from "./files-and-ignores-schema.js";
 // Types
 //------------------------------------------------------------------------------
 
-/** @typedef {import("@eslint/object-schema").PropertyDefinition} PropertyDefinition */
-/** @typedef {import("@eslint/object-schema").ObjectDefinition} ObjectDefinition */
 /** @typedef {import("./types.ts").ConfigObject} ConfigObject */
 /** @typedef {import("minimatch").IMinimatchStatic} IMinimatchStatic */
 /** @typedef {import("minimatch").IMinimatch} IMinimatch */
-/** @typedef {import("@jsr/std__path")} PathImpl */
+/** @import * as PathImpl from "@jsr/std__path" */
 
 /*
  * This is a bit of a hack to make TypeScript happy with the Rollup-created
@@ -34,7 +32,7 @@ import { filesAndIgnoresSchema } from "./files-and-ignores-schema.js";
  * for `ObjectSchema`. To work around that, we just import the type manually
  * and give it a different name to use in the JSDoc comments.
  */
-/** @typedef {import("@eslint/object-schema").ObjectSchema} ObjectSchemaInstance */
+/** @typedef {ObjectSchema} ObjectSchemaInstance */
 
 //------------------------------------------------------------------------------
 // Helpers
@@ -968,7 +966,8 @@ export class ConfigArray extends Array {
 	 * @param {Object} config The config to finalize.
 	 * @returns {Object} The finalized config.
 	 */
-	[ConfigArraySymbol.finalizeConfig](config) {
+	// Cast key to `never` to prevent TypeScript from adding the signature `[x: symbol]: (config: any) => any` to the type of the class.
+	[/** @type {never} */ (ConfigArraySymbol.finalizeConfig)](config) {
 		return config;
 	}
 
@@ -980,7 +979,8 @@ export class ConfigArray extends Array {
 	 * @param {Object} config The config to preprocess.
 	 * @returns {Object} The config to use in place of the argument.
 	 */
-	[ConfigArraySymbol.preprocessConfig](config) {
+	// Cast key to `never` to prevent TypeScript from adding the signature `[x: symbol]: (config: any) => any` to the type of the class.
+	[/** @type {never} */ (ConfigArraySymbol.preprocessConfig)](config) {
 		return config;
 	}
 
diff --git a/packages/config-array/tests/types/cjs-import.test.cts b/packages/config-array/tests/types/cjs-import.test.cts
new file mode 100644
index 000000000..f80a15616
--- /dev/null
+++ b/packages/config-array/tests/types/cjs-import.test.cts
@@ -0,0 +1,10 @@
+/**
+ * @fileoverview CommonJS type import test for Config Array package.
+ * @author Francesco Trotta
+ */
+
+//-----------------------------------------------------------------------------
+// Imports
+//-----------------------------------------------------------------------------
+
+import "@eslint/config-array";
diff --git a/packages/config-array/tests/types/tsconfig.json b/packages/config-array/tests/types/tsconfig.json
new file mode 100644
index 000000000..638c0f3a5
--- /dev/null
+++ b/packages/config-array/tests/types/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "noEmit": true,
+    "rootDir": "../.."
+  },
+  "include": [".", "../../dist"]
+}
diff --git a/packages/config-array/tests/types/types.test.ts b/packages/config-array/tests/types/types.test.ts
new file mode 100644
index 000000000..7b9ff36d2
--- /dev/null
+++ b/packages/config-array/tests/types/types.test.ts
@@ -0,0 +1,10 @@
+/**
+ * @fileoverview Type tests for Config Array package.
+ * @author Francesco Trotta
+ */
+
+//-----------------------------------------------------------------------------
+// Imports
+//-----------------------------------------------------------------------------
+
+import "@eslint/config-array";
diff --git a/packages/object-schema/package.json b/packages/object-schema/package.json
index f016d77b3..dbb23e1ce 100644
--- a/packages/object-schema/package.json
+++ b/packages/object-schema/package.json
@@ -27,9 +27,10 @@
   "scripts": {
     "build:cts": "node ../../tools/build-cts.js dist/esm/index.d.ts dist/cjs/index.d.cts",
     "build": "rollup -c && tsc -p tsconfig.esm.json && npm run build:cts",
-    "test:jsr": "npx jsr@latest publish --dry-run",
     "test": "mocha \"tests/**/*.test.js\"",
-    "test:coverage": "c8 npm test"
+    "test:coverage": "c8 npm test",
+    "test:jsr": "npx jsr@latest publish --dry-run",
+    "test:types": "tsc -p tests/types/tsconfig.json"
   },
   "repository": {
     "type": "git",
diff --git a/packages/object-schema/rollup.config.js b/packages/object-schema/rollup.config.js
index 03a11e126..5b813a884 100644
--- a/packages/object-schema/rollup.config.js
+++ b/packages/object-schema/rollup.config.js
@@ -16,7 +16,7 @@ export default {
 	plugins: [
 		copy({
 			targets: [
-				{ src: "src/types.ts", dest: "dist/cjs" },
+				{ src: "src/types.ts", dest: "dist/cjs", rename: "types.cts" },
 				{ src: "src/types.ts", dest: "dist/esm" },
 			],
 		}),
diff --git a/packages/object-schema/tests/types/cjs-import.test.cts b/packages/object-schema/tests/types/cjs-import.test.cts
new file mode 100644
index 000000000..df767d4a3
--- /dev/null
+++ b/packages/object-schema/tests/types/cjs-import.test.cts
@@ -0,0 +1,10 @@
+/**
+ * @fileoverview CommonJS type import test for ObjectSchema package.
+ * @author Francesco Trotta
+ */
+
+//-----------------------------------------------------------------------------
+// Imports
+//-----------------------------------------------------------------------------
+
+import "@eslint/object-schema";
diff --git a/packages/object-schema/tests/types/tsconfig.json b/packages/object-schema/tests/types/tsconfig.json
new file mode 100644
index 000000000..638c0f3a5
--- /dev/null
+++ b/packages/object-schema/tests/types/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "noEmit": true,
+    "rootDir": "../.."
+  },
+  "include": [".", "../../dist"]
+}
diff --git a/packages/object-schema/tests/types/types.test.ts b/packages/object-schema/tests/types/types.test.ts
new file mode 100644
index 000000000..1cd89a875
--- /dev/null
+++ b/packages/object-schema/tests/types/types.test.ts
@@ -0,0 +1,10 @@
+/**
+ * @fileoverview Type tests for ObjectSchema package.
+ * @author Francesco Trotta
+ */
+
+//-----------------------------------------------------------------------------
+// Imports
+//-----------------------------------------------------------------------------
+
+import "@eslint/object-schema";
diff --git a/templates/package/package.json b/templates/package/package.json
index 0427a900f..4bee178ec 100644
--- a/templates/package/package.json
+++ b/templates/package/package.json
@@ -28,9 +28,10 @@
     "build:dedupe-types": "node ../../tools/dedupe-types.js dist/cjs/index.cjs dist/esm/index.js",
     "build:cts": "node ../../tools/build-cts.js dist/esm/index.d.ts dist/cjs/index.d.cts",
     "build": "rollup -c && npm run build:dedupe-types && tsc -p tsconfig.esm.json && npm run build:cts",
-    "test:jsr": "npx jsr@latest publish --dry-run",
     "test": "mocha \"tests/**/*.test.js\"",
-    "test:coverage": "c8 npm test"
+    "test:coverage": "c8 npm test",
+    "test:jsr": "npx jsr@latest publish --dry-run",
+    "test:types": "tsc -p tests/types/tsconfig.json"
   },
   "repository": {
     "type": "git",
diff --git a/templates/package/tests/types/tsconfig.json b/templates/package/tests/types/tsconfig.json
new file mode 100644
index 000000000..638c0f3a5
--- /dev/null
+++ b/templates/package/tests/types/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "noEmit": true,
+    "rootDir": "../.."
+  },
+  "include": [".", "../../dist"]
+}