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// which is ES2017 at best: no TextEncoder, no AbortController, no globalThis.
const toStringTag = Object.prototype.toString;
export function isNil(v) {
return v === null || v === undefined;
}
export function hasOwn(obj, key) {
return Object.prototype.hasOwnProperty.call(obj, key);
}
export function isPlainObject(v) {
return !!v && typeof v === 'object' && !Array.isArray(v) && !isBytesLike(v);
}
// Realm independent check. wx APIs and test sandboxes may hand over buffers from another realm,
// where `instanceof ArrayBuffer` is false.
export function isArrayBuffer(x) {
return !!x && toStringTag.call(x) === '[object ArrayBuffer]';
}
export function isBytesLike(x) {
return isArrayBuffer(x) || (!!x && typeof x === 'object' && ArrayBuffer.isView(x));
}
/**
* ArrayBuffer or any ArrayBufferView to a plain Uint8Array view (no copy), null for anything else.
* Subclasses (Node's Buffer, whose slice() does not copy) are re-wrapped as plain Uint8Array.
*/
export function toUint8(x) {
if (x instanceof Uint8Array && x.constructor === Uint8Array) return x;
if (isArrayBuffer(x)) return new Uint8Array(x);
if (x && typeof x === 'object' && ArrayBuffer.isView(x)) return new Uint8Array(x.buffer, x.byteOffset, x.byteLength);
return null;
}
/** A new plain Uint8Array with a copy of the bytes. */
export function copyBytes(u8) {
const out = new Uint8Array(u8.length);
out.set(u8);
return out;
}
/** An ArrayBuffer holding exactly the bytes of the view, copying only when the view is partial. */
export function exactArrayBuffer(u8) {
if (u8.byteOffset === 0 && u8.byteLength === u8.buffer.byteLength) return u8.buffer;
return copyBytes(u8).buffer;
}
export function concatBytes(chunks) {
let total = 0;
for (let i = 0; i < chunks.length; i++) total += chunks[i].length;
const out = new Uint8Array(total);
let pos = 0;
for (let i = 0; i < chunks.length; i++) {
out.set(chunks[i], pos);
pos += chunks[i].length;
}
return out;
}
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;
}
export function randomBytes(n, random) {
const rnd = typeof random === 'function' ? random : Math.random;
const b = new Uint8Array(n);
for (let i = 0; i < n; i++) b[i] = Math.floor(rnd() * 256) & 0xff;
return b;
}
export function randomHex(nBytes) {
return toHex(randomBytes(nBytes));
}
/** Case-insensitive header lookup. wx returns header names in server casing, sometimes lower case. */
export function headerValue(headers, name) {
if (!headers || typeof headers !== 'object') return undefined;
const wanted = name.toLowerCase();
const keys = Object.keys(headers);
for (let i = 0; i < keys.length; i++) {
if (keys[i].toLowerCase() === wanted) {
const v = headers[keys[i]];
return Array.isArray(v) ? v.join(', ') : v;
}
}
return undefined;
}
/** Query string from a flat object, dropping null, undefined and empty strings. */
export function encodeQuery(params) {
const parts = [];
const keys = Object.keys(params);
for (let i = 0; i < keys.length; i++) {
const v = params[keys[i]];
if (isNil(v) || v === '') continue;
parts.push(encodeURIComponent(keys[i]) + '=' + encodeURIComponent(String(v)));
}
return parts.join('&');
}
export function trimTrailingSlash(url) {
return String(url).replace(/\/+$/, '');
}
export function noop() {}
export function microtask(fn) {
Promise.resolve().then(fn);
}
export function toInt(v) {
if (typeof v === 'number' && isFinite(v)) return Math.trunc(v);
if (typeof v === 'string' && /^\s*-?\d+\s*$/.test(v)) return parseInt(v, 10);
return 0;
}
export function toNumberOrNull(v) {
if (typeof v === 'number') return isFinite(v) ? v : null;
if (typeof v === 'string' && v.trim() !== '' && isFinite(Number(v))) return Number(v);
return null;
}
export function truncate(s, max) {
if (typeof s !== 'string') return s;
return s.length > max ? s.slice(0, max) : s;
}
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