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[WIP] Investigate Vite 8 CI failure with TextDecoder reference error #9988

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[WIP] Investigate Vite 8 CI failure with TextDecoder reference error #9988

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1f55503
Initial plan
Copilot Mar 27, 2026
bb790b5
Changes before error encountered
Copilot Mar 27, 2026
c3e8836
fix: add TextDecoder/TextEncoder to VM context for Vite 8 compatibility
Copilot Mar 27, 2026
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9 changes: 9 additions & 0 deletions packages/vitest/src/runtime/workers/vm.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -80,6 +80,15 @@ export async function runVmTests(method: 'run' | 'collect', state: WorkerGlobalS
// TODO: don't hardcode setImmediate in fake timers defaults
context.setImmediate = setImmediate
context.clearImmediate = clearImmediate
// Vite 8+ uses TextDecoder/TextEncoder at the module level in module-runner.js,
// so they need to be available in the VM context even if the environment doesn't provide them
// see: https://github.com/vitejs/vite/pull/21985
if (!('TextDecoder' in context)) {
context.TextDecoder = TextDecoder
}
if (!('TextEncoder' in context)) {
context.TextEncoder = TextEncoder
}

const stubs = getDefaultRequestStubs(context)

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