feat(core): experimental softMode — reuse workers with per-file env reset#1289

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pkasarda wants to merge 9 commits into

web-infra-dev:mainfrom

pkasarda:feat/isolate-soft

Commits on May 20, 2026

feat(core): isolate: 'soft' — reuse workers without env teardown
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feat(core): isolate: 'soft' — env persistence + worker-scope spy restore

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claude
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feat(core): isolate: 'soft' — snapshot+restore DOM prototype descriptors

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feat(core): rename isolate:'soft' → experiments.softMode + harden

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feat(core): drain pending async from prior file before per-file listeners

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feat(core): polish experiments.softMode after review

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feat(core): warn on isolate:false + softMode conflict, add happy-dom e2e

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feat(core): bound heap growth in softMode via per-worker task cap

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feat(core): make softMode maxFilesPerWorker configurable
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