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import { FileRef, nextTestSetup } from 'e2e-utils'
import { createSandbox } from 'development-sandbox'
import path from 'path'
import { outdent } from 'outdent'
const middlewarePath = 'middleware.js'
const middlewareWarning = `A middleware can not alter response's body`
describe('middlewares', () => {
const { next } = nextTestSetup({
files: new FileRef(
path.join(__dirname, '..', 'acceptance', 'fixtures', 'default-template')
),
skipStart: true,
})
it.each([
{
title: 'returning response with literal string',
code: outdent`
export default function middleware() {
return new Response('this is not allowed');
}
`,
},
{
title: 'returning response with literal number',
code: outdent`
export default function middleware() {
return new Response(10);
}
`,
},
{
title: 'returning response with JSON.stringify',
code: outdent`
export default function middleware() {
return new Response(JSON.stringify({ foo: 'this is not allowed' }));
}
`,
},
{
title: 'populating response with a value',
code: outdent`
export default function middleware(request) {
const body = JSON.stringify({ foo: 'this should not be allowed, but hard to detect with AST' })
return new Response(body);
}
`,
},
{
title: 'populating response with a function call',
code: outdent`
function buildBody() {
return 'this should not be allowed, but hard to detect with AST'
}
export default function middleware(request) {
return new Response(buildBody());
}
`,
},
{
title: 'populating response with an async function call',
code: outdent`
export default async function middleware(request) {
return new Response(await fetch('https://example.vercel.sh'));
}
`,
},
])('does not warn when $title', async ({ code }) => {
await using _sandbox = await createSandbox(
next,
new Map([[middlewarePath, code]])
)
expect(next.cliOutput).not.toMatch(middlewareWarning)
})
it.each([
{
title: 'returning null reponse body',
code: outdent`
export default function middleware() {
return new Response(null);
}
`,
},
{
title: 'returning undefined response body',
code: outdent`
export default function middleware() {
return new Response(undefined);
}
`,
},
])('does not warn when $title', async ({ code }) => {
await using _sandbox = await createSandbox(
next,
new Map([[middlewarePath, code]])
)
expect(next.cliOutput).not.toMatch(middlewareWarning)
})
})
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