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Matteo Collina
4e75b714df
Constructing a TransformStream allocated five closures for the sink and source algorithms of its two sides, and each side adopted the start promise through a wrapper promise plus a thenable job, so a stream without a start() left about three kilobytes pending in the microtask queue until the started steps ran. Per-stream creation bursts spend most of their time copying that graph through the scavenger. The sink and source algorithms are now shared functions that reach the transform stream through a field on their controller state (the controller is passed to the close, abort and cancel algorithms for that), and the post-start steps of both sides are delivered by one reaction chain on a shared promise, taking the same microtask hops as the spec's start promise adoption: three after construction for a non-thenable start result, two after the adopting promise settles for a thenable one. The readable and writable transfer state records are materialized on first transfer instead of per stream. Signed-off-by: Matteo Collina <hello@matteocollina.com> PR-URL: https://github.com/nodejs/node/pull/66643 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Mattias Buelens <mattias@buelens.com> Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>