import type { MiddlewareHandler } from '../../types.ts' type EncodingType = 'gzip' | 'deflate' interface CompressionOptions { encoding?: EncodingType } export const compress = (options?: CompressionOptions): MiddlewareHandler => { return async (ctx, next) => { await next() const accepted = ctx.req.headers.get('Accept-Encoding') const pattern = options?.encoding ?? /gzip|deflate/ const match = accepted?.match(pattern) if (!accepted || !match || !ctx.res.body) { return } const encoding = match[0] const stream = new CompressionStream(encoding as EncodingType) ctx.res = new Response(ctx.res.body.pipeThrough(stream), ctx.res) ctx.res.headers.set('Content-Encoding', encoding) } }