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// Small helpers shared by the SDK modules. Browser and Node 18+ compatible, no dependencies.
const textEncoder = new TextEncoder();
const textDecoder = new TextDecoder('utf-8');
/** UTF-8 encode a string. */
export function utf8(str) {
return textEncoder.encode(String(str));
}
/** UTF-8 decode bytes. */
export function utf8Decode(bytes) {
return textDecoder.decode(bytes);
}
const toStringTag = (x) => Object.prototype.toString.call(x);
/** True for ArrayBuffer and SharedArrayBuffer, also across realms (iframes, vm contexts). */
export function isArrayBuffer(x) {
if (x instanceof ArrayBuffer) return true;
const tag = toStringTag(x);
return tag === '[object ArrayBuffer]' || tag === '[object SharedArrayBuffer]';
}
/** The global object in browsers, workers and Node, also where globalThis is missing. */
export function getGlobal() {
if (typeof globalThis !== 'undefined') return globalThis;
/* c8 ignore next 3 */
if (typeof self !== 'undefined') return self;
if (typeof window !== 'undefined') return window;
return {};
}
/** True for Blob and File (anything with size plus arrayBuffer(), or an instance of Blob). */
export function isBlobLike(x) {
if (x == null || typeof x !== 'object') return false;
const g = getGlobal();
if (typeof g.Blob === 'function' && x instanceof g.Blob) return true;
return typeof x.arrayBuffer === 'function' && typeof x.size === 'number';
}
/**
* Bytes of a Blob. Blob.arrayBuffer() exists from Chrome 76, Firefox 69 and Safari 14; older
* browsers read through FileReader.
*/
export function readBlob(blob) {
if (typeof blob.arrayBuffer === 'function') return blob.arrayBuffer();
const g = getGlobal();
if (typeof g.FileReader === 'function') {
return new Promise((resolve, reject) => {
const fr = new g.FileReader();
fr.onload = () => resolve(fr.result);
fr.onerror = () => reject(fr.error);
fr.readAsArrayBuffer(blob);
});
}
/* c8 ignore next */
return new g.Response(blob).arrayBuffer();
}
/**
* View ArrayBuffer or any ArrayBufferView as Uint8Array without copying.
* Returns null for other inputs.
*/
export function toBytes(data) {
if (data instanceof Uint8Array) return data;
if (isArrayBuffer(data)) return new Uint8Array(data);
if (ArrayBuffer.isView(data)) return new Uint8Array(data.buffer, data.byteOffset, data.byteLength);
return null;
}
/** Copy of the bytes in a fresh ArrayBuffer of exactly that length. */
export function toExactArrayBuffer(bytes) {
const buf = bytes.buffer;
if (bytes.byteOffset === 0 && bytes.byteLength === buf.byteLength && (buf instanceof ArrayBuffer || toStringTag(buf) === '[object ArrayBuffer]')) {
return buf;
}
const copy = new Uint8Array(bytes.byteLength);
copy.set(bytes);
return copy.buffer;
}
/** Concatenate byte chunks. */
export function concatBytes(chunks) {
let total = 0;
for (const c of chunks) total += c.length;
const out = new Uint8Array(total);
let off = 0;
for (const c of chunks) {
out.set(c, off);
off += c.length;
}
return out;
}
/** Index of needle in haystack (bytes), or -1. */
export function indexOfBytes(haystack, needle, from = 0) {
const n = needle.length;
if (n === 0) return from;
const first = needle[0];
const last = haystack.length - n;
outer: for (let i = from; i <= last; i++) {
if (haystack[i] !== first) continue;
for (let j = 1; j < n; j++) if (haystack[i + j] !== needle[j]) continue outer;
return i;
}
return -1;
}
/** Standard base64 (with padding) of ArrayBuffer or ArrayBufferView. */
export function bytesToBase64(input) {
const bytes = toBytes(input);
if (!bytes) throw new TypeError('bytesToBase64 expects an ArrayBuffer or ArrayBufferView');
if (typeof btoa === 'function') {
let bin = '';
const CHUNK = 0x8000;
for (let i = 0; i < bytes.length; i += CHUNK) {
bin += String.fromCharCode.apply(null, bytes.subarray(i, i + CHUNK));
}
return btoa(bin);
}
/* c8 ignore next 2 */
// eslint-disable-next-line no-undef
return Buffer.from(bytes).toString('base64');
}
/** Lowercase hex of bytes. */
export function toHex(bytes) {
let s = '';
for (let i = 0; i < bytes.length; i++) s += (bytes[i] < 16 ? '0' : '') + bytes[i].toString(16);
return s;
}
/** The Web Crypto object to use: injected first, then globalThis.crypto. */
export function getCrypto(injected) {
if (injected) return injected;
const g = getGlobal();
return g.crypto || null;
}
/** n random bytes from crypto.getRandomValues, Math.random only when no crypto exists. */
export function randomBytes(n, cryptoImpl) {
const out = new Uint8Array(n);
const c = getCrypto(cryptoImpl);
if (c && typeof c.getRandomValues === 'function') {
c.getRandomValues(out);
return out;
}
for (let i = 0; i < n; i++) out[i] = Math.floor(Math.random() * 256);
return out;
}
/** Truncate a string to max UTF-16 units. */
export function truncate(s, max) {
if (s == null) return s;
const str = String(s);
return str.length > max ? str.slice(0, max) : str;
}
/** Plain object check. */
export function isPlainObject(x) {
if (x === null || typeof x !== 'object') return false;
const p = Object.getPrototypeOf(x);
return p === Object.prototype || p === null;
}
/** Remove trailing slashes. */
export function stripTrailingSlash(url) {
return String(url).replace(/\/+$/, '');
}
/** Detect a browser or web worker (where fetch cannot set User-Agent). */
export function isBrowserLike() {
const g = getGlobal();
if (typeof g.window !== 'undefined' && typeof g.document !== 'undefined') return true;
if (typeof g.importScripts === 'function') return true;
return false;
}
/**
* Promise that resolves after ms, or rejects with the value returned by onAbort when any of the
* given AbortSignal-like objects fires.
*/
export function abortableDelay(ms, signals, onAbort) {
return new Promise((resolve, reject) => {
const list = (signals || []).filter(Boolean);
for (const s of list) {
if (s.aborted) {
reject(onAbort(s));
return;
}
}
let timer = null;
const cleanups = [];
const done = () => {
if (timer !== null) clearTimeout(timer);
for (const c of cleanups) c();
};
for (const s of list) {
const h = () => {
done();
reject(onAbort(s));
};
s.addEventListener('abort', h, { once: true });
cleanups.push(() => s.removeEventListener('abort', h));
}
timer = setTimeout(() => {
timer = null;
done();
resolve();
}, Math.max(0, ms));
});
}
/** Number check that also rejects NaN and Infinity. */
export function isFiniteNumber(x) {
return typeof x === 'number' && Number.isFinite(x);
}
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