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https://github.com/vercel-labs/scriptc.git
synced 2026-10-23 06:10:02 +08:00
Chris Tate
44cde1510e
- New codes, minted in badType's classification order: SC2005 values whose type keeps a generic call signature, SC2006 index-signature shapes outside the supported set, SC2007 overloaded function types, SC2008 intersections with no resolved lowering, SC2009 supported container/function/record shapes over a component outside its slot — the SC2009 message names the offending component (Map/Set key-value domains, array/tuple elements, union arms, function rest/params/returns, record members) via describeComponentBlocker/describeRecordMemberBlocker in frontend/types.ts, which mirror mapType's own rules on the failure path only. - Standard-library nominal types with no lowering at all (Date, ArrayBuffer, WeakMap, the iterator and constructor interfaces) now route to the existing SC2020 story instead of the supported-set recitation; stdlib provenance is checked after the container claims so Map/Set/Promise instantiation failures keep their component story. - SC2001 keeps the honest remainder — bigint and symbol primitives, constructor objects, and library-derived or unresolved generic shapes — and its registry name now says so; across the diagnostics corpus its rendered sites drop from 57 to 5. - Every new code flows through the diagnostics registry, the regenerated surface manifest, and coverage-report grouping; five new tests/diagnostics programs pin one rendered frame per code, and the ts7 order-parity baselines re-record to include them. - Zero behavior change to accepted programs: the differential corpus (900 programs) is untouched and green, and the full suite passes.
17 lines
597 B
TypeScript
17 lines
597 B
TypeScript
// SC2007: values of overloaded function type — a compiled function VALUE is
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// one concrete signature. Calls of overloaded declarations resolve per call
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// site; it is the value position that fences.
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function pick(x: "a"): string;
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function pick(x: "b"): number;
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function pick(x: string): string | number {
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return x === "a" ? "A" : 1;
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}
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const stored = pick;
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console.log(stored("a"));
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// An overloaded TYPE LITERAL slot fences the same way.
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declare const on: { (event: "exit", code: number): void; (event: "error", err: string): void };
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const listener = on;
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console.log(listener("exit", 0));
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