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import { createNext, FileRef } from 'e2e-utils'
import { NextInstance } from 'e2e-utils'
import { fetchViaHTTP } from 'next-test-utils'
import path from 'path'
import fs from 'fs-extra'
function extractJSON(response) {
return JSON.parse(response.headers.get('data') ?? '{}')
}
function baseNextConfig(): Parameters<typeof createNext>[0] {
return {
files: {
'src/add.wasm': new FileRef(path.join(__dirname, './add.wasm')),
'src/add.js': `
import wasm from './add.wasm?module'
const instance$ = WebAssembly.instantiate(wasm);
export async function increment(a) {
const { exports } = await instance$;
return exports.add_one(a);
}
`,
'pages/index.js': `
export default function () { return <div>Hello, world!</div> }
`,
'middleware.js': `
import { increment } from './src/add.js'
export default async function middleware(request) {
const input = Number(request.nextUrl.searchParams.get('input')) || 1;
const value = await increment(input);
return new Response(null, { headers: { data: JSON.stringify({ input, value }) } });
}
`,
},
}
}
describe('edge api endpoints can use wasm files', () => {
let next: NextInstance
beforeAll(async () => {
next = await createNext({
files: {
'pages/api/add.js': `
import { increment } from '../../src/add.js'
export default async (request) => {
const input = Number(request.nextUrl.searchParams.get('input')) || 1;
const value = await increment(input);
return new Response(null, { headers: { data: JSON.stringify({ input, value }) } });
}
export const config = { runtime: 'edge' };
`,
'src/add.wasm': new FileRef(path.join(__dirname, './add.wasm')),
'src/add.js': `
import wasm from './add.wasm?module'
const instance$ = WebAssembly.instantiate(wasm);
export async function increment(a) {
const { exports } = await instance$;
return exports.add_one(a);
}
`,
},
})
})
afterAll(() => next.destroy())
it('uses the wasm file', async () => {
const response = await fetchViaHTTP(next.url, '/api/add', { input: 10 })
expect(extractJSON(response)).toEqual({
input: 10,
value: 11,
})
})
})
describe('middleware can use wasm files', () => {
let next: NextInstance
beforeAll(async () => {
const config = baseNextConfig()
next = await createNext(config)
})
afterAll(() => next.destroy())
it('uses the wasm file', async () => {
const response = await fetchViaHTTP(next.url, '/')
expect(extractJSON(response)).toEqual({
input: 1,
value: 2,
})
})
it('can be called twice', async () => {
const response = await fetchViaHTTP(next.url, '/', { input: 2 })
expect(extractJSON(response)).toEqual({
input: 2,
value: 3,
})
})
if (!(global as any).isNextDeploy) {
it('lists the necessary wasm bindings in the manifest', async () => {
const manifestPath = path.join(
next.testDir,
'.next/server/middleware-manifest.json'
)
const manifest = await fs.readJSON(manifestPath)
if (process.env.IS_TURBOPACK_TEST) {
expect(manifest.middleware['/'].wasm).toEqual(
expect.arrayContaining([
expect.objectContaining({
filePath: expect.stringMatching(
/^server\/edge\/chunks\/.*\.wasm$/
),
name: expect.stringMatching(/^wasm_/),
}),
])
)
} else {
expect(manifest.middleware['/'].wasm).toEqual(
expect.arrayContaining([
expect.objectContaining({
filePath: expect.stringMatching(
/^server\/edge-chunks\/wasm_.*\.wasm$/
),
name: expect.stringMatching(/^wasm_/),
}),
])
)
}
})
}
})
describe('middleware can use wasm files with the experimental modes on', () => {
let next: NextInstance
beforeAll(async () => {
const config = baseNextConfig()
config.files['next.config.js'] = `
module.exports = {
webpack(config) {
config.output.webassemblyModuleFilename = 'static/wasm/[modulehash].wasm'
// Since Webpack 5 doesn't enable WebAssembly by default, we should do it manually
config.experiments = { ...config.experiments, asyncWebAssembly: true }
return config
},
}
`
next = await createNext(config)
})
afterAll(() => next.destroy())
it('uses the wasm file', async () => {
const response = await fetchViaHTTP(next.url, '/')
expect(extractJSON(response)).toEqual({
input: 1,
value: 2,
})
})
})
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