fix: Remove instanceof checks for errors (#266)

README.md

@@ -923,7 +923,7 @@ These behave similarly to their counterparts above, except that the options obje
 Found exposes lower-level functionality for doing server-side rendering for use with your own Redux store, as with `createConnectedRouter` above. On the server, use `getStoreRenderArgs` to get a promise for the arguments to your `render` function.
 
 ```js
-import { getStoreRenderArgs, RedirectException } from 'found';
+import { getStoreRenderArgs } from 'found';
 
 /* ... */
 
@@ -939,7 +939,7 @@ app.use(async (req, res) => {
       resolver,
     });
   } catch (e) {
-    if (e instanceof RedirectException) {
+    if (e.isFoundRedirectException) {
       res.redirect(302, store.farce.createHref(e.location));
       return;
     }

src/HttpError.js

@@ -1,4 +1,6 @@
 export default class HttpError {
+  isFoundHttpError = true;
+
   constructor(status, data) {
     this.status = status;
     this.data = data;

src/RedirectException.js

@@ -1,5 +1,7 @@
 // This isn't really an error.
 export default class RedirectException {
+  isFoundRedirectException = true;
+
   constructor(location) {
     this.location = location;
   }

src/createBaseRouter.js

@@ -5,7 +5,6 @@ import StaticContainer from 'react-static-container';
 import warning from 'warning';
 
 import { routerShape } from './PropTypes';
-import RedirectException from './RedirectException';
 import createRender from './createRender';
 import resolveRenderArgs from './utils/resolveRenderArgs';
 
@@ -144,7 +143,7 @@ export default function createBaseRouter({
           }
         }
       } catch (e) {
-        if (e instanceof RedirectException) {
+        if (e.isFoundRedirectException) {
           this.props.router.replace(e.location);
           return;
         }

src/server/getFarceResult.js

@@ -4,7 +4,6 @@ import React from 'react';
 import { Provider } from 'react-redux';
 
 import getStoreRenderArgs from '../getStoreRenderArgs';
-import RedirectException from '../RedirectException';
 import defaultResolver from '../resolver';
 import createFarceStore from '../utils/createFarceStore';
 
@@ -33,7 +32,7 @@ export default async function getFarceResult({
       resolver,
     });
   } catch (e) {
-    if (e instanceof RedirectException) {
+    if (e.isFoundRedirectException) {
       // The store is not exposed to the user, so we need to build the redirect
       // URL here.
       return {

src/utils/resolveRenderArgs.js

@@ -55,7 +55,7 @@ export default async function* resolveRenderArgs({
       };
     }
   } catch (e) {
-    if (e instanceof HttpError) {
+    if (e.isFoundHttpError) {
       yield { ...augmentedMatch, error: e };
       return;
     }