fafbea8b74
This PR introduces [Edge Runtime](https://edge-runtime.vercel.app/) for emulating [Edge Functions](https://vercel.com/features/edge-functions) locally. Every time you run a [middleware](https://nextjs.org/docs/advanced-features/middleware) locally via `next dev`, an isolated edge runtime context will be created. These contexts have the same constraints as production servers, plus they don't pollute the global scope; Instead, all the code run in a vm on top of a Node.js process. Additionally, `@edge-runtime/jest-environment` has been added to make easier testing Edge Functions in a programmatic way. It dropped the following polyfills from Next.js codebase, since they are now part of Edge Runtime: - abort-controller - formdata - uuid - web-crypto - web-streams Co-authored-by: Gal Schlezinger <2054772+Schniz@users.noreply.github.com>
17 lines
685 B
JavaScript
17 lines
685 B
JavaScript
const Primitives =
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require('next/dist/compiled/@edge-runtime/primitives').default
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const OriginWritableStreamWrite =
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Primitives.WritableStreamDefaultWriter.prototype.write
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// Override writable stream write method to validate chunk type.
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// Currently CF workers only allow to write the encoded chunk in Uint8Array format.
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Primitives.WritableStreamDefaultWriter.prototype.write = function (chunk) {
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if (!(chunk instanceof Uint8Array)) {
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throw new Error('Writing non-Uint8Array chunks in a stream is not allowed.')
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}
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return OriginWritableStreamWrite.call(this, chunk)
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}
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global.ReadableStream = Primitives.ReadableStream
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global.TransformStream = Primitives.TransformStream
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