buffer: remove async tick and improve perf by 680%

Author: anonrig

benchmark/blob/blob-text.js

@@ -0,0 +1,28 @@
+'use strict';
+const common = require('../common.js');
+
+const bench = common.createBenchmark(main, {
+  bytes: [0, 8, 128],
+  n: [1e6],
+  operation: ['text', 'arrayBuffer', 'stream']
+});
+
+function main({ n, bytes, operation }) {
+  const buff = Buffer.allocUnsafe(bytes);
+  const source = new Blob(buff);
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    switch (operation) {
+      case 'text':
+        source.text();
+        break;
+      case 'arrayBuffer':
+        source.arrayBuffer();
+        break;
+      case 'stream':
+        source.stream();
+        break;
+    }
+  }
+  bench.end(n);
+}

lib/internal/blob.js

@@ -8,6 +8,7 @@ const {
   PromiseResolve,
   PromiseReject,
   SafePromisePrototypeFinally,
+  PromisePrototypeThen,
   ReflectConstruct,
   RegExpPrototypeExec,
   RegExpPrototypeSymbolReplace,
@@ -308,13 +309,13 @@ class Blob {
   /**
    * @returns {Promise<string>}
    */
-  async text() {
+  text() {
     if (!isBlob(this))
-      throw new ERR_INVALID_THIS('Blob');
+      return PromiseReject(new ERR_INVALID_THIS('Blob'));
 
     dec ??= new TextDecoder();
 
-    return dec.decode(await this.arrayBuffer());
+    return PromisePrototypeThen(this.arrayBuffer(), (value) => dec.decode(value));
   }
 
   /**