koajs · Froguard · Jul 31, 2019 · Jul 31, 2019 · Jul 31, 2019 · Aug 5, 2019
diff --git a/Readme.md b/Readme.md
@@ -16,6 +16,7 @@ $ npm install koa-error
 
  - `template` path to template written with your template engine
  - `engine` template engine name passed to [consolidate](https://github.com/tj/consolidate.js)
+ - `options` template engine options passed to [consolidate](https://github.com/tj/consolidate.js), [more-consolidate-options](https://github.com/tj/consolidate.js/blob/master/lib/consolidate.js)
  - `cache` cached compiled functions, default: `NODE_ENV != 'development'`
  - `env` force a NODE_ENV, default: `development`
  - `accepts` mimetypes passed to [ctx.accepts](https://github.com/koajs/koa/blob/master/docs/api/request.md#requestacceptstypes), default: `[ 'html', 'text', 'json' ]`
@@ -99,6 +100,70 @@ app.use(error({
 </html>
 ```
 
+#### Custom filters, use macro,block in Nunjucks
+
+koa-error engine tool base on [consolidate](https://github.com/tj/consolidate.js), you can also set consolidate options 
+
+> [more-nunjucks-options](https://github.com/tj/consolidate.js/blob/master/lib/consolidate.js#L1317-L1370)
+
+`app.js`:
+
+```js
+//...
+const app = new Koa();
+const nunjucks = require('nunjucks');
+const nunjucksEnv = new nunjucks.Environment(new nunjucks.FileSystemLoader(path.join(__dirname, 'tpl')));
+
+// add filters
+const filters = require('./filters');
+for(let [k, v] of Object.entries(filters)){
+    nunjucksEnv.addFilter(k, v);
+}
+
+//...
+app.use(koaError({
+    //...
+    template: path.join(__dirname, 'tpl/error.html'),
+    options: {
+        nunjucksEnv // custom nunjucks env
+    }
+}));
+```
+
+`filters.js`:
+
+```js
+module.exports = { 
+    // define filters function here
+    stringify(..args){
+        return JSON.stringify(...args);
+    }
+    //...
+};
+```
+
+`tpl/error.html`:
+
+```html
+<!DOCTYPE html>
+<html>
+  <head>
+    {% include "./com.html" %}
+  </head>
+  <body>
+    <p>{{ request | stringify }}</p> {# use filters here #}
+    <!-- ... -->
+  </body>
+</htm>
+```
+
+`tpl/com.html`:
+
+```html
+<link rel="stylesheet" href="/css/normalize.css" />
+```
+
+
 ## License
 
   MIT
diff --git a/index.js b/index.js
@@ -27,6 +27,8 @@ module.exports = error
 function error (opts) {
   opts = opts || {}
 
+  let { options } = opts
+
   const engine = opts.engine || 'lodash'
 
   const accepts = opts.accepts || [ 'html', 'text', 'json' ]
@@ -68,7 +70,7 @@ function error (opts) {
 
         case 'html':
           ctx.type = 'text/html'
-          ctx.body = await consolidate[engine](path, {
+          ctx.body = await consolidate[engine](path, Object.assign({
             originalError: err,
             cache: cache,
             env: env,
@@ -79,7 +81,7 @@ function error (opts) {
             stack: err.stack,
             status: ctx.status,
             code: err.code
-          })
+          }, options))
           break
       }
     }