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diff --git a/test/e2e/app-dir/generate-static-params-invalid/fixtures/empty-object/app/[[...slug]]/page.js b/test/e2e/app-dir/generate-static-params-invalid/fixtures/empty-object/app/[[...slug]]/page.js
new file mode 100644
index 00000000..425b4fe5
--- /dev/null
+++ b/test/e2e/app-dir/generate-static-params-invalid/fixtures/empty-object/app/[[...slug]]/page.js
@@ -0,0 +1,7 @@
+export function generateStaticParams() {
+  return [{}]
+}
+
+export default function Page() {
+  return <p>empty object</p>
+}
diff --git a/test/e2e/app-dir/generate-static-params-invalid/fixtures/empty-object/app/layout.js b/test/e2e/app-dir/generate-static-params-invalid/fixtures/empty-object/app/layout.js
new file mode 100644
index 00000000..750eb927
--- /dev/null
+++ b/test/e2e/app-dir/generate-static-params-invalid/fixtures/empty-object/app/layout.js
@@ -0,0 +1,7 @@
+export default function Layout({ children }) {
+  return (
+    <html>
+      <body>{children}</body>
+    </html>
+  )
+}
diff --git a/test/e2e/app-dir/generate-static-params-invalid/fixtures/non-array/app/[slug]/page.js b/test/e2e/app-dir/generate-static-params-invalid/fixtures/non-array/app/[slug]/page.js
new file mode 100644
index 00000000..7cbbd64c
--- /dev/null
+++ b/test/e2e/app-dir/generate-static-params-invalid/fixtures/non-array/app/[slug]/page.js
@@ -0,0 +1,7 @@
+export function generateStaticParams() {
+  return { slug: 'first' }
+}
+
+export default function Page() {
+  return <p>non-array</p>
+}
diff --git a/test/e2e/app-dir/generate-static-params-invalid/fixtures/non-array/app/layout.js b/test/e2e/app-dir/generate-static-params-invalid/fixtures/non-array/app/layout.js
new file mode 100644
index 00000000..750eb927
--- /dev/null
+++ b/test/e2e/app-dir/generate-static-params-invalid/fixtures/non-array/app/layout.js
@@ -0,0 +1,7 @@
+export default function Layout({ children }) {
+  return (
+    <html>
+      <body>{children}</body>
+    </html>
+  )
+}
diff --git a/test/e2e/app-dir/generate-static-params-invalid/fixtures/non-object-entry/app/[slug]/page.js b/test/e2e/app-dir/generate-static-params-invalid/fixtures/non-object-entry/app/[slug]/page.js
new file mode 100644
index 00000000..26be227b
--- /dev/null
+++ b/test/e2e/app-dir/generate-static-params-invalid/fixtures/non-object-entry/app/[slug]/page.js
@@ -0,0 +1,7 @@
+export function generateStaticParams() {
+  return [null]
+}
+
+export default function Page() {
+  return <p>non-object entry</p>
+}
diff --git a/test/e2e/app-dir/generate-static-params-invalid/fixtures/non-object-entry/app/layout.js b/test/e2e/app-dir/generate-static-params-invalid/fixtures/non-object-entry/app/layout.js
new file mode 100644
index 00000000..750eb927
--- /dev/null
+++ b/test/e2e/app-dir/generate-static-params-invalid/fixtures/non-object-entry/app/layout.js
@@ -0,0 +1,7 @@
+export default function Layout({ children }) {
+  return (
+    <html>
+      <body>{children}</body>
+    </html>
+  )
+}
diff --git a/test/e2e/app-dir/generate-static-params-invalid/fixtures/primitive-entry/app/[slug]/page.js b/test/e2e/app-dir/generate-static-params-invalid/fixtures/primitive-entry/app/[slug]/page.js
new file mode 100644
index 00000000..f9ef3566
--- /dev/null
+++ b/test/e2e/app-dir/generate-static-params-invalid/fixtures/primitive-entry/app/[slug]/page.js
@@ -0,0 +1,7 @@
+export function generateStaticParams() {
+  return ['first']
+}
+
+export default function Page() {
+  return <p>primitive entry</p>
+}
diff --git a/test/e2e/app-dir/generate-static-params-invalid/fixtures/primitive-entry/app/layout.js b/test/e2e/app-dir/generate-static-params-invalid/fixtures/primitive-entry/app/layout.js
new file mode 100644
index 00000000..750eb927
--- /dev/null
+++ b/test/e2e/app-dir/generate-static-params-invalid/fixtures/primitive-entry/app/layout.js
@@ -0,0 +1,7 @@
+export default function Layout({ children }) {
+  return (
+    <html>
+      <body>{children}</body>
+    </html>
+  )
+}
diff --git a/test/e2e/app-dir/generate-static-params-invalid/generate-static-params-invalid.test.ts b/test/e2e/app-dir/generate-static-params-invalid/generate-static-params-invalid.test.ts
new file mode 100644
index 00000000..90dc0f1d
--- /dev/null
+++ b/test/e2e/app-dir/generate-static-params-invalid/generate-static-params-invalid.test.ts
@@ -0,0 +1,64 @@
+import { generateRouteStaticParams } from '../../../../packages/next/src/build/static-paths/app'
+import { generateStaticParams as emptyObjectParams } from './fixtures/empty-object/app/[[...slug]]/page'
+import { generateStaticParams as nonArrayParams } from './fixtures/non-array/app/[slug]/page'
+import { generateStaticParams as nonObjectEntryParams } from './fixtures/non-object-entry/app/[slug]/page'
+import { generateStaticParams as primitiveEntryParams } from './fixtures/primitive-entry/app/[slug]/page'
+
+async function callGenerateStaticParams(generateStaticParams: () => unknown) {
+  return generateRouteStaticParams(
+    [
+      {
+        config: undefined,
+        generateStaticParams: generateStaticParams as never,
+        createEmptyParamsError: undefined,
+      },
+    ],
+    { fetchCache: undefined, page: '/[slug]' },
+    false,
+    []
+  )
+}
+
+async function expectInvalidShape(
+  generateStaticParams: () => unknown,
+  expectedShape: 'array' | 'object'
+) {
+  try {
+    await callGenerateStaticParams(generateStaticParams)
+  } catch (error) {
+    expect(error).toBeInstanceOf(Error)
+    expect((error as Error).message).toMatch(/generateStaticParams/i)
+    expect((error as Error).message).toMatch(new RegExp(expectedShape, 'i'))
+    return
+  }
+
+  throw new Error(
+    `Expected generateStaticParams to reject a non-${expectedShape}`
+  )
+}
+
+describe('generateStaticParams return value validation', () => {
+  it.each([
+    ['object', nonArrayParams],
+    ['null', () => null],
+    ['primitive', () => 'slug'],
+  ])(
+    'rejects the %s return value instead of an array',
+    async (_description, generateStaticParams) => {
+      await expectInvalidShape(generateStaticParams, 'array')
+    }
+  )
+
+  it.each([
+    ['null', nonObjectEntryParams],
+    ['primitive', primitiveEntryParams],
+  ])('rejects a %s array entry', async (_description, generateStaticParams) => {
+    await expectInvalidShape(generateStaticParams, 'object')
+  })
+
+  it('continues to accept an empty parameter object', async () => {
+    await expect(callGenerateStaticParams(emptyObjectParams)).resolves.toEqual([
+      {},
+    ])
+  })
+})