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Chris Tate
176d963ea1
- isSupportedIndexValue admits func/map/set: the overflow map's RC and trace machinery is already fully type-directed (scr_closure/scr_map adapters, the cycle fixpoint's map rule recursing on the value), and nested index-signature records rode the record kind all along - the C keyed-read miss trap can now describe Map/Set-typed slots (dynDesc), reachable only through that message — no dynCheck ever expects a container - SC2006's message and hint name the real value domain (functions, Maps, Sets, RegExps, Promises, ...) and the honest blockers left: symbol keys, dual signatures with unequal value types, and values with no representation at all - diagnostics fixtures pivot to still-fenced shapes (Uint8Array values, unequal duals, a Date-valued bag); corpus 2558/2559 pin the command-registry and container-table patterns — declared+overflow hybrids, enumeration, delete, registry-capturing cycles, container churn — byte-identical vs Node on both backends
20 lines
799 B
TypeScript
20 lines
799 B
TypeScript
// SC2006: index-signature object types outside the supported shape.
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// String- and number-keyed signatures over the supported value types
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// compile — functions (the command-registry pattern), Maps, Sets, and
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// nested index-signature records included (differential corpus); these
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// do not.
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// A symbol-keyed signature has no lowering.
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const bySymbol: { [s: symbol]: number } = {};
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console.log(bySymbol);
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// A value type with no representation in the overflow store.
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const buffers: Record<string, Uint8Array> = {};
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console.log(buffers);
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// Dual signatures whose value types intern DIFFERENTLY cannot share the
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// one store (tsc requires only assignability, but the store gives one
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// answer per key).
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const dual: { [k: string]: string | number; [n: number]: number } = {};
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console.log(dual);
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