feat: init

node_modules/serve-placeholder/dist/index.cjs

@@ -0,0 +1,101 @@
+'use strict';
+
+const defu = require('defu');
+
+function _interopDefaultCompat (e) { return e && typeof e === 'object' && 'default' in e ? e.default : e; }
+
+const defu__default = /*#__PURE__*/_interopDefaultCompat(defu);
+
+const DefaultOptions = {
+  statusCode: 404,
+  skipUnknown: false,
+  cacheHeaders: true,
+  placeholderHeader: true,
+  handlers: {
+    // css
+    ".css": "css",
+    // html
+    ".html": "html",
+    ".htm": "html",
+    // image
+    ".png": "image",
+    ".jpg": "image",
+    ".jpeg": "image",
+    ".gif": "image",
+    ".svg": "image",
+    ".webp": "image",
+    ".bmp": "image",
+    ".ico": "image",
+    // js
+    ".js": "js",
+    // json
+    ".json": "json",
+    // map
+    ".map": "map",
+    // plain
+    ".txt": "plain",
+    ".text": "plain",
+    ".md": "plain"
+  },
+  placeholders: {
+    css: "/* style not found */",
+    default: void 0,
+    html: "<!-- page not found -->",
+    image: "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7",
+    js: "/* script not found */",
+    json: "{}",
+    map: '{"version": "3", "sources": [], "mappings": "" }',
+    plain: ""
+  },
+  mimes: {
+    css: "text/css",
+    default: void 0,
+    html: "text/html",
+    js: "application/javascript",
+    json: "application/json",
+    image: "image/gif",
+    map: "application/json",
+    plain: "text/plain"
+  }
+};
+
+const EXT_REGEX = /\.[\dA-Za-z]+$/;
+function servePlaceholder(_options = {}) {
+  const options = defu__default(_options, DefaultOptions);
+  return function servePlaceholderMiddleware(req, res, next) {
+    if (res.writableEnded) {
+      return;
+    }
+    const url = req.url.split("?")[0];
+    const ext = (url.match(EXT_REGEX) || [])[0] || "";
+    let handler = options.handlers[ext];
+    if (handler === false) {
+      return next();
+    }
+    if (handler === void 0) {
+      if (options.skipUnknown) {
+        return next();
+      }
+      handler = "default";
+    }
+    if (options.statusCode) {
+      res.statusCode = options.statusCode;
+    }
+    const mime = options.mimes[handler];
+    if (mime) {
+      res.setHeader("Content-Type", mime);
+    }
+    if (options.cacheHeaders) {
+      res.setHeader("Cache-Control", "no-cache, no-store, must-revalidate");
+      res.setHeader("Pragma", "no-cache");
+      res.setHeader("Expires", "0");
+    }
+    if (options.placeholderHeader) {
+      res.setHeader("X-Placeholder", handler);
+    }
+    const placeholder = options.placeholders[handler];
+    res.end(placeholder);
+  };
+}
+
+exports.servePlaceholder = servePlaceholder;