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// META: global=window,worker,shadowrealm
'use strict';
promise_test(async t => {
/** @type {ReadableStreamDefaultController} */
var con;
let synchronous = false;
new ReadableStream({ start(c) { con = c }}, { highWaterMark: 0 }).pipeTo(
new WritableStream({ write() { synchronous = true; } })
)
// wait until start algorithm finishes
await Promise.resolve();
con.enqueue();
assert_false(synchronous, 'write algorithm must not run synchronously');
}, "enqueue() must not synchronously call write algorithm");
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