Commit With Frontend and Backend in MERN

backend/node_modules/bson/src/parse_utf8.ts

@@ -0,0 +1,35 @@
+import { BSONError } from './error';
+
+type TextDecoder = {
+  readonly encoding: string;
+  readonly fatal: boolean;
+  readonly ignoreBOM: boolean;
+  decode(input?: Uint8Array): string;
+};
+type TextDecoderConstructor = {
+  new (label: 'utf8', options: { fatal: boolean; ignoreBOM?: boolean }): TextDecoder;
+};
+
+// parse utf8 globals
+declare const TextDecoder: TextDecoderConstructor;
+let TextDecoderFatal: TextDecoder;
+let TextDecoderNonFatal: TextDecoder;
+
+/**
+ * Determines if the passed in bytes are valid utf8
+ * @param bytes - An array of 8-bit bytes. Must be indexable and have length property
+ * @param start - The index to start validating
+ * @param end - The index to end validating
+ */
+export function parseUtf8(buffer: Uint8Array, start: number, end: number, fatal: boolean): string {
+  if (fatal) {
+    TextDecoderFatal ??= new TextDecoder('utf8', { fatal: true });
+    try {
+      return TextDecoderFatal.decode(buffer.subarray(start, end));
+    } catch (cause) {
+      throw new BSONError('Invalid UTF-8 string in BSON document', { cause });
+    }
+  }
+  TextDecoderNonFatal ??= new TextDecoder('utf8', { fatal: false });
+  return TextDecoderNonFatal.decode(buffer.subarray(start, end));
+}