mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-11-07 08:33:50 +08:00
Chris Tate
f2a629ae06
- Extract preflight's benign-cycle admission (the cheap per-edge rule plus the declaration-only init window analysis, with Tarjan SCC and cluster-verdict memos) into makeCycleAdmission; preflight's static walk and appendDynamicImportModules now judge back edges identically, so benign cycles behind dynamic import() compile as Node cache hits instead of blanket SC1016. - appendDynamicImportModules runs once in lowerToIr before any pass constructs: the old per-constructor run minted cycle refusals into the discovery pass, whose diagnostics are discarded by design, so inadmissible import() cycles silently compiled; refusals now land on the emit pass with the same narrowed reason (binding and line, or the offending top-level statement) the static walk mints. - SC1016 gains a registry hint naming the admitted shape and the fix; diagnostics snapshots, order-parity baselines, and the surface manifest repin with it. - Corpus 2604 (mutual class cycle across two modules), 2605 (three-module function ring with two back edges and a function-body-only value use), 2606 (import() into an admitted mutual-recursion cycle) — all byte-identical to Node through both backends; diagnostics fixture dyn-import-cycle-tdz pins the dynamic-path TDZ refusal.
19 lines
782 B
TypeScript
19 lines
782 B
TypeScript
// @dynamic
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// Dynamic import() into a benign import cycle: ping.ts and pong.ts are
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// mutually-recursive modules reachable ONLY through import(), so the
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// static preflight never sees them — the --dynamic subgraph walk
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// (appendDynamicImportModules) judges the cycle with the same admission
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// engine and admits it: declaration-only top levels, cycle-crossing
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// bindings called only inside function bodies. The run-once init guards
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// reproduce Node's cache-hit evaluation of the pair on the microtask.
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async function main(): Promise<void> {
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console.log("start");
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const ns = await import("./ping.ts");
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console.log(ns.ping(5));
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console.log(ns.ping(0));
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const again = await import("./pong.ts");
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console.log(again.pong(2));
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}
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main();
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console.log("after main() call");
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