The reason for the error.
let reason: String
s19JavaScriptEventLoop21WebWorkerTaskExecutorC10SpawnErrorV6reasonSSvp
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import JavaScriptEventLoop
struct SpawnError
An error that occurs when spawning a worker thread fails.
final class WebWorkerTaskExecutor
A task executor that runs tasks on Web Worker threads.
@frozen struct String
A Unicode string value that is a collection of characters.