Add extracted source directory and README navigation

extracted-source/node_modules/@anthropic-ai/foundry-sdk/internal/utils/base64.mjs

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+// File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
+import { AnthropicError } from "../../core/error.mjs";
+import { encodeUTF8 } from "./bytes.mjs";
+export const toBase64 = (data) => {
+    if (!data)
+        return '';
+    if (typeof globalThis.Buffer !== 'undefined') {
+        return globalThis.Buffer.from(data).toString('base64');
+    }
+    if (typeof data === 'string') {
+        data = encodeUTF8(data);
+    }
+    if (typeof btoa !== 'undefined') {
+        return btoa(String.fromCharCode.apply(null, data));
+    }
+    throw new AnthropicError('Cannot generate base64 string; Expected `Buffer` or `btoa` to be defined');
+};
+export const fromBase64 = (str) => {
+    if (typeof globalThis.Buffer !== 'undefined') {
+        const buf = globalThis.Buffer.from(str, 'base64');
+        return new Uint8Array(buf.buffer, buf.byteOffset, buf.byteLength);
+    }
+    if (typeof atob !== 'undefined') {
+        const bstr = atob(str);
+        const buf = new Uint8Array(bstr.length);
+        for (let i = 0; i < bstr.length; i++) {
+            buf[i] = bstr.charCodeAt(i);
+        }
+        return buf;
+    }
+    throw new AnthropicError('Cannot decode base64 string; Expected `Buffer` or `atob` to be defined');
+};
+//# sourceMappingURL=base64.mjs.map