log and bail if express version > 4

index.js

@@ -1,47 +1,55 @@
-const Layer = require('express/lib/router/layer');
-const Router = require('express/lib/router');
+/* eslint-disable global-require,no-inner-declarations */
+const { version: expressVersion } = require('express/package.json');
 
-const last = (arr = []) => arr[arr.length - 1];
-const noop = Function.prototype;
+if (expressVersion[0] > 4) {
+  // eslint-disable-next-line no-console
+  console.log(`DEPRECATED: Package express-async-errors works with version 4.x.x of Express, you are using ${expressVersion} which supports async route handlers natively`);
+} else {
+  const Layer = require('express/lib/router/layer');
+  const Router = require('express/lib/router');
 
-function copyFnProps(oldFn, newFn) {
-  Object.keys(oldFn).forEach((key) => {
-    newFn[key] = oldFn[key];
-  });
-  return newFn;
-}
+  const last = (arr = []) => arr[arr.length - 1];
+  const noop = Function.prototype;
 
-function wrap(fn) {
-  const newFn = function newFn(...args) {
-    const ret = fn.apply(this, args);
-    const next = (args.length === 5 ? args[2] : last(args)) || noop;
-    if (ret && ret.catch) ret.catch(err => next(err));
-    return ret;
-  };
-  Object.defineProperty(newFn, 'length', {
-    value: fn.length,
-    writable: false,
-  });
-  return copyFnProps(fn, newFn);
-}
+  function copyFnProps(oldFn, newFn) {
+    Object.keys(oldFn).forEach((key) => {
+      newFn[key] = oldFn[key];
+    });
+    return newFn;
+  }
 
-function patchRouterParam() {
-  const originalParam = Router.prototype.constructor.param;
-  Router.prototype.constructor.param = function param(name, fn) {
-    fn = wrap(fn);
-    return originalParam.call(this, name, fn);
-  };
-}
+  function wrap(fn) {
+    const newFn = function newFn(...args) {
+      const ret = fn.apply(this, args);
+      const next = (args.length === 5 ? args[2] : last(args)) || noop;
+      if (ret && ret.catch) ret.catch(err => next(err));
+      return ret;
+    };
+    Object.defineProperty(newFn, 'length', {
+      value: fn.length,
+      writable: false,
+    });
+    return copyFnProps(fn, newFn);
+  }
+
+  function patchRouterParam() {
+    const originalParam = Router.prototype.constructor.param;
+    Router.prototype.constructor.param = function param(name, fn) {
+      fn = wrap(fn);
+      return originalParam.call(this, name, fn);
+    };
+  }
 
-Object.defineProperty(Layer.prototype, 'handle', {
-  enumerable: true,
-  get() {
-    return this.__handle;
-  },
-  set(fn) {
-    fn = wrap(fn);
-    this.__handle = fn;
-  },
-});
+  Object.defineProperty(Layer.prototype, 'handle', {
+    enumerable: true,
+    get() {
+      return this.__handle;
+    },
+    set(fn) {
+      fn = wrap(fn);
+      this.__handle = fn;
+    },
+  });
 
-patchRouterParam();
+  patchRouterParam();
+}