[instant] Let dev-server requests bypass the fetch lock#95761
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While an instant() testing scope is active, the navigation testing lock replaces `window.fetch` and queues every request until the scope ends. This also blocked the dev server's own client-side requests, i.e. everything served by the hot-reloader middlewares: the error overlay could not resolve stack frames via `/__nextjs_original-stack-frames`, source maps could not load via `/__nextjs_source-map`, and devtools actions like launch-editor hung for the whole scope. The fix lets same-origin requests to `/__nextjs_`-prefixed paths (the shared prefix of all hot-reloader middleware endpoints) through the lock immediately.
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While an
instant()testing scope is active, the navigation testing lock replaceswindow.fetchand queues every request until the scope ends. This also blocked the dev server's own client-side requests, i.e. everything served by the hot-reloader middlewares: the error overlay could not resolve stack frames via/__nextjs_original-stack-frames, source maps could not load via/__nextjs_source-map, and devtools actions like launch-editor hung for the whole scope.The fix lets same-origin requests to
/__nextjs_-prefixed paths (the shared prefix of all hot-reloader middleware endpoints) through the lock immediately.Before:
CleanShot.2026-07-14.at.13.55.18.mp4