feat: fail build when netlify forms detected without workaround (#2539)

* feat: fail build when netlify forms detected without workaround

* test: update forms tests

* feat: check env var before verifying netlify forms

Author: orinokai

src/build/verification.ts

@@ -113,13 +113,13 @@ export async function verifyNetlifyFormsWorkaround(ctx: PluginContext) {
 
 export function verifyNetlifyForms(ctx: PluginContext, html: string) {
   if (
-    !verifications.has('netlifyForms') &&
+    process.env.NETLIFY_NEXT_VERIFY_FORMS !== '0' &&
+    process.env.NETLIFY_NEXT_VERIFY_FORMS?.toUpperCase() !== 'FALSE' &&
     !verifications.has('netlifyFormsWorkaround') &&
     formDetectionRegex.test(html)
   ) {
-    console.warn(
+    ctx.failBuild(
       '@netlify/plugin-nextjs@5 requires migration steps to support Netlify Forms. Refer to https://ntl.fyi/next-runtime-forms-migration for migration example.',
     )
-    verifications.add('netlifyForms')
   }
 }

tests/integration/netlify-forms.test.ts

@@ -19,24 +19,24 @@ beforeEach<FixtureTestContext>(async (ctx) => {
   await startMockBlobStore(ctx)
 })
 
-it<FixtureTestContext>('should warn when netlify forms are used', async (ctx) => {
+it<FixtureTestContext>('should fail build when netlify forms are used', async (ctx) => {
   const warn = vi.spyOn(console, 'warn').mockImplementation(() => {})
 
   await createFixture('netlify-forms', ctx)
 
-  const runPluginPromise = await runPlugin(ctx)
+  const runPluginPromise = runPlugin(ctx)
 
-  expect(warn).toBeCalledWith(
+  await expect(runPluginPromise).rejects.toThrow(
     '@netlify/plugin-nextjs@5 requires migration steps to support Netlify Forms. Refer to https://ntl.fyi/next-runtime-forms-migration for migration example.',
   )
 })
 
-it<FixtureTestContext>('should not warn when netlify forms are used with workaround', async (ctx) => {
+it<FixtureTestContext>('should not fail build when netlify forms are used with workaround', async (ctx) => {
   const warn = vi.spyOn(console, 'warn').mockImplementation(() => {})
 
   await createFixture('netlify-forms-workaround', ctx)
 
-  const runPluginPromise = await runPlugin(ctx)
+  const runPluginPromise = runPlugin(ctx)
 
-  expect(warn).not.toBeCalled()
+  await expect(runPluginPromise).resolves
 })