debt - btoa/atob is not core

src/vs/base/browser/dom.ts

@@ -1362,3 +1362,24 @@ export function safeInnerHtml(node: HTMLElement, value: string): void {
 	const html = _ttpSafeInnerHtml?.createHTML(value, options) ?? insane(value, options);
 	node.innerHTML = html as unknown as string;
 }
+
+/**
+ * Convert a Unicode string to a string in which each 16-bit unit occupies only one byte
+ *
+ * From https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/btoa
+ */
+function toBinary(str: string): string {
+	const codeUnits = new Uint16Array(str.length);
+	for (let i = 0; i < codeUnits.length; i++) {
+		codeUnits[i] = str.charCodeAt(i);
+	}
+	return String.fromCharCode(...new Uint8Array(codeUnits.buffer));
+}
+
+/**
+ * Version of the global `btoa` function that handles multi-byte characters instead
+ * of throwing an exception.
+ */
+export function multibyteAwareBtoa(str: string): string {
+	return btoa(toBinary(str));
+}