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backend/node_modules/hono/dist/middleware/compress/index.js

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+// src/middleware/compress/index.ts
+import { COMPRESSIBLE_CONTENT_TYPE_REGEX } from "../../utils/compress.js";
+var ENCODING_TYPES = ["gzip", "deflate"];
+var cacheControlNoTransformRegExp = /(?:^|,)\s*?no-transform\s*?(?:,|$)/i;
+var compress = (options) => {
+  const threshold = options?.threshold ?? 1024;
+  return async function compress2(ctx, next) {
+    await next();
+    const contentLength = ctx.res.headers.get("Content-Length");
+    if (ctx.res.headers.has("Content-Encoding") || // already encoded
+    ctx.res.headers.has("Transfer-Encoding") || // already encoded or chunked
+    ctx.req.method === "HEAD" || // HEAD request
+    contentLength && Number(contentLength) < threshold || // content-length below threshold
+    !shouldCompress(ctx.res) || // not compressible type
+    !shouldTransform(ctx.res)) {
+      return;
+    }
+    const accepted = ctx.req.header("Accept-Encoding");
+    const encoding = options?.encoding ?? ENCODING_TYPES.find((encoding2) => accepted?.includes(encoding2));
+    if (!encoding || !ctx.res.body) {
+      return;
+    }
+    const stream = new CompressionStream(encoding);
+    ctx.res = new Response(ctx.res.body.pipeThrough(stream), ctx.res);
+    ctx.res.headers.delete("Content-Length");
+    ctx.res.headers.set("Content-Encoding", encoding);
+  };
+};
+var shouldCompress = (res) => {
+  const type = res.headers.get("Content-Type");
+  return type && COMPRESSIBLE_CONTENT_TYPE_REGEX.test(type);
+};
+var shouldTransform = (res) => {
+  const cacheControl = res.headers.get("Cache-Control");
+  return !cacheControl || !cacheControlNoTransformRegExp.test(cacheControl);
+};
+export {
+  compress
+};