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Re:Show HN: Scratch.js – Interactive JavaScript Scratchpad by angleofrepose on Wednesday November 18, 2020 @05:16PM (#25143214)
Do you see any other solutions in the same domain as Stopify? Another method that might provide a way to keep UI unblocked but still have user executable code?
Re:Show HN: Scratch.js – Interactive JavaScript Scratchpad by rng_civ on Wednesday November 18, 2020 @06:18PM (#25143969)
If you need the user code to execute on the main thread, then unfortunately I am aware of none besides bundling your own tailored system.

Pyret used to use its own runtime system [0] but Stopify was created in part to replace it due to the maintenance burden and complexity of "vanilla" JS interoperability.

[0] https://www.pyret.org/docs/latest/s_running.html