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https://github.com/vercel-labs/scriptc.git
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Chris Tate
4427f1fb5a
- Support boolean, bigint, and mixed value keys in native Maps and Sets. - Reuse key hashes and copy collections directly into compact storage. - Preserve collection identity, ordering, iteration, and ownership behavior.
37 lines
1.3 KiB
TypeScript
37 lines
1.3 KiB
TypeScript
// Map support boundaries at lowering. Keep accepted adjacent forms here
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// as well so widening the value domain removes its old diagnostic.
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// Boolean keys compile alongside the remaining value and method fences.
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const byFlag = new Map<boolean, string>();
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// Values exclude functions (no closure story in the uniform value slot yet).
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const handlers = new Map<string, () => void>();
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// Typed nested Maps retain their identity and are supported.
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const nested = new Map<string, Map<string, number>>();
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// Boolean-keyed parameter slots share the supported key domain.
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function useFlags(m: Map<boolean, number>): number {
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return m.size;
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}
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// Nullable Map views are supported; no diagnostic should appear here.
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function maybeMap(cond: boolean): Map<string, number> | undefined {
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return undefined;
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}
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// Maps as array elements now preserve references without a diagnostic.
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const rows: Map<string, number>[] = [];
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// Maps are not JSON (Node stringifies them as the useless "{}" husk;
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// scriptc rejects instead of shipping that).
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const m = new Map<string, number>();
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console.log(JSON.stringify(m));
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// Map methods have no bound-value form — call them directly.
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const getter = m.get;
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// Reached: collection defers its diagnostics until a reference makes
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// them relevant; these references are what makes them count.
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useFlags(new Map<boolean, number>());
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maybeMap(true);
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