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

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+"use strict";
+var __defProp = Object.defineProperty;
+var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
+var __getOwnPropNames = Object.getOwnPropertyNames;
+var __hasOwnProp = Object.prototype.hasOwnProperty;
+var __export = (target, all) => {
+  for (var name in all)
+    __defProp(target, name, { get: all[name], enumerable: true });
+};
+var __copyProps = (to, from, except, desc) => {
+  if (from && typeof from === "object" || typeof from === "function") {
+    for (let key of __getOwnPropNames(from))
+      if (!__hasOwnProp.call(to, key) && key !== except)
+        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
+  }
+  return to;
+};
+var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
+var compress_exports = {};
+__export(compress_exports, {
+  compress: () => compress
+});
+module.exports = __toCommonJS(compress_exports);
+var import_compress = require("../../utils/compress");
+const ENCODING_TYPES = ["gzip", "deflate"];
+const cacheControlNoTransformRegExp = /(?:^|,)\s*?no-transform\s*?(?:,|$)/i;
+const 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);
+  };
+};
+const shouldCompress = (res) => {
+  const type = res.headers.get("Content-Type");
+  return type && import_compress.COMPRESSIBLE_CONTENT_TYPE_REGEX.test(type);
+};
+const shouldTransform = (res) => {
+  const cacheControl = res.headers.get("Cache-Control");
+  return !cacheControl || !cacheControlNoTransformRegExp.test(cacheControl);
+};
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  compress
+});