feat(reliability): WhatsApp Web version caching (#1847)

* feat: use specific whatsapp web version

* add constants to version updater

* configurable caches

* rename

* typings

* rm extraneous export

* missing from the rename

* rm version resolver

* match readme version

* use try-catch

* only persist if cache miss

src/webCache/LocalWebCache.js

@@ -0,0 +1,43 @@
+const path = require('path');
+const fs = require('fs');
+
+const { WebCache, VersionResolveError } = require('./WebCache');
+
+/**
+ * LocalWebCache - Fetches a WhatsApp Web version from a local file store
+ * @param {object} options - options
+ * @param {string} options.path - Path to the directory where cached versions are saved, default is: "./.wwebjs_cache/" 
+ * @param {boolean} options.strict - If true, will throw an error if the requested version can't be fetched. If false, will resolve to the latest version.
+ */
+class LocalWebCache extends WebCache {
+    constructor(options = {}) {
+        super();
+
+        this.path = options.path || './.wwebjs_cache/';
+        this.strict = options.strict || false;
+    }
+
+    async resolve(version) {
+        const filePath = path.join(this.path, `${version}.html`);
+        
+        try {
+            return fs.readFileSync(filePath, 'utf-8');
+        }
+        catch (err) {
+            if (this.strict) throw new VersionResolveError(`Couldn't load version ${version} from the cache`);
+            return null;
+        }
+    }
+
+    async persist(indexHtml) {
+        // extract version from index (e.g. manifest-2.2206.9.json -> 2.2206.9)
+        const version = indexHtml.match(/manifest-([\d\\.]+)\.json/)[1];
+        if(!version) return;
+   
+        const filePath = path.join(this.path, `${version}.html`);
+        fs.mkdirSync(this.path, { recursive: true });
+        fs.writeFileSync(filePath, indexHtml);
+    }
+}
+
+module.exports = LocalWebCache;