@eyhn/msgpack-stream
Version:
MessagePack for ECMA-262/JavaScript/TypeScript
48 lines • 2.13 kB
JavaScript
// utility for whatwg streams
var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var g = generator.apply(thisArg, _arguments || []), i, q = [];
return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
function fulfill(value) { resume("next", value); }
function reject(value) { resume("throw", value); }
function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
};
export function isAsyncIterable(object) {
return object[Symbol.asyncIterator] != null;
}
function assertNonNull(value) {
if (value == null) {
throw new Error("Assertion Failure: value must not be null nor undefined");
}
}
export function asyncIterableFromStream(stream) {
return __asyncGenerator(this, arguments, function* asyncIterableFromStream_1() {
const reader = stream.getReader();
try {
while (true) {
const { done, value } = yield __await(reader.read());
if (done) {
return yield __await(void 0);
}
assertNonNull(value);
yield yield __await(value);
}
}
finally {
reader.releaseLock();
}
});
}
export function ensureAsyncIterable(streamLike) {
if (isAsyncIterable(streamLike)) {
return streamLike;
}
else {
return asyncIterableFromStream(streamLike);
}
}
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