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node-polyfill-fetch.ts
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node-polyfill-fetch.ts
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// TODO: Remove use of `any` type.
// Polyfill fetch() in the Node.js environment
if (typeof fetch === 'undefined' && typeof globalThis.fetch === 'undefined') {
function getFetchImpl() {
return require('next/dist/compiled/undici')
}
function getRequestImpl() {
const OriginRequest = getFetchImpl().Request
return class Request extends OriginRequest {
constructor(input: any, init: any) {
super(input, init)
this.next = init?.next
}
}
}
// Due to limitation of global configuration, we have to do this resolution at runtime
globalThis.fetch = (...args: any[]) => {
const fetchImpl = getFetchImpl()
// Undici does not support the `keepAlive` option,
// instead we have to pass a custom dispatcher
if (
!(global as any).__NEXT_HTTP_AGENT_OPTIONS?.keepAlive &&
!(global as any).__NEXT_UNDICI_AGENT_SET
) {
;(global as any).__NEXT_UNDICI_AGENT_SET = true
fetchImpl.setGlobalDispatcher(new fetchImpl.Agent({ pipelining: 0 }))
console.warn(
'Warning - Configuring `keepAlive: false` is deprecated. Use `{ headers: { connection: "close" } }` instead.'
)
}
return fetchImpl.fetch(...args)
}
Object.defineProperties(global, {
Headers: {
get() {
return getFetchImpl().Headers
},
},
Request: {
get() {
return getRequestImpl()
},
},
Response: {
get() {
return getFetchImpl().Response
},
},
})
}