fix: use version of htmlrewriter which does not make use of asyncify, which looks to have a potential memory leak under high load

we noticed the memory issue with Netlify's CSP plugin which used the same htmlrewriter library. We've built a new htmlrewriter library which uses the latest version of lol-html and removes the ability to use async-handlers, which is what required asyncify to be included.

Author: JakeChampion

deno.json

@@ -6,5 +6,6 @@
   },
   "imports": {
     "@netlify/edge-functions": "https://edge.netlify.com/v1/index.ts"
-  }
+  },
+  "importMap": "./edge-runtime/vendor/import_map.json"
 }

edge-runtime/lib/response.ts

@@ -1,5 +1,5 @@
 import type { Context } from '@netlify/edge-functions'
-import { HTMLRewriter } from '../vendor/deno.land/x/[email protected]/index.ts'
+import { HTMLRewriter, init, type TextChunk } from 'https://deno.land/x/[email protected]/src/index.ts'
 
 import { updateModifiedHeaders } from './headers.ts'
 import type { StructuredLogger } from './logging.ts'
@@ -13,6 +13,8 @@ import {
   relativizeURL,
 } from './util.ts'
 
+await init();
+
 export interface FetchEventResult {
   response: Response
   waitUntil: Promise<any>
@@ -79,7 +81,7 @@ export const buildResponse = async ({
 
     if (response.dataTransforms.length > 0) {
       rewriter.on('script[id="__NEXT_DATA__"]', {
-        text(textChunk) {
+        text(textChunk: TextChunk) {
           // Grab all the chunks in the Next data script tag
           buffer += textChunk.text
           if (textChunk.lastInTextNode) {