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fix(playground): check the browser can run the VM before downloading - #129
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Load the VM runtime with Arm64JS.mode() first. It rejects with unsupported-browser where the VM can't run (e.g. Firefox/Safari without cross-origin isolation), so those visitors get the error up front instead of after ~200 MB of heph + plugin downloads. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Before any download, the playground now loads the VM runtime with
Arm64JS.mode(). That only loads the runtime (inline, or the CDN frame handshake), and it rejects withunsupported-browserwhen the browser can't isolate the VM. Visitors on an unsupported browser now get the error right away instead of after ~200 MB of heph + plugin downloads.It's cheap: no image is fetched and nothing boots. The runtime it loads is the same one the boot reuses afterwards.
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