Calling `sleep()` causes `TypeError: can't convert null to BigInt`

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#134 opened on Jul 20, 2021 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 25/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Stale
Tech stack: javascript, swift, wasm
Domain: operating-systems

Research direction

Reproduce the failure with the linked swiftwasmsleep project and the provided Swift snippet. Start by tracing poll_oneoff in node_modules/@wasmer/wasi/lib/index.esm.js and its call from startWasiTask in entrypoint/dev.js. Done means sleep(1000) completes without the BigInt TypeError and the program prints "After sleep()".

Written by the indexing model from the issue text.

Description

bug

Title says it. Code:

import Foundation
import JavaScriptKit

print("Before sleep()")
sleep(1000) // wasm bails out
print("After sleep()") // Never happens

Project for the above code: https://github.com/ShonFrazier/swiftwasmsleep

The full error is:

 TypeError: can't convert null to BigInt
     poll_oneoff webpack:///./node_modules/@wasmer/wasi/lib/index.esm.js?:128
     start webpack:///./node_modules/@wasmer/wasi/lib/index.esm.js?:131
     startWasiTask webpack:///./entrypoint/dev.js?:92
     async* webpack:///./entrypoint/dev.js?:103
     js http://127.0.0.1:8181/dev.js:97
     __webpack_require__ http://127.0.0.1:8181/dev.js:20
     <anonymous> http://127.0.0.1:8181/dev.js:84
     <anonymous> http://127.0.0.1:8181/dev.js:87
 dev.js:96:11
     handleError webpack:///./entrypoint/dev.js?:96
     (Async: promise callback)
     <anonymous> webpack:///./entrypoint/dev.js?:103
     js http://127.0.0.1:8181/dev.js:97
     __webpack_require__ http://127.0.0.1:8181/dev.js:20
     <anonymous> http://127.0.0.1:8181/dev.js:84
     <anonymous> http://127.0.0.1:8181/dev.js:87

Dominant language: Swift
Stars: 986
Forks: 76
Avg merge: 21h 11m
Merged PRs (30d): 4

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