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https://github.com/vercel-labs/scriptc.git
synced 2026-10-22 05:59:31 +08:00
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.
40 lines
1.4 KiB
TypeScript
40 lines
1.4 KiB
TypeScript
// Set support boundaries: what stays rejected at LOWERING, with specific
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// messages. Elements share Map's key domain; unsupported forms remain fenced.
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// Array and same-element Set seeds lower, preserving insertion order
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// and copying membership into independent storage. Keep this accepted
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// form beside the unsupported element domains below.
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const seeded = new Set(new Set(["a", "b"]));
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// Boolean elements compile beside the remaining method and serialization
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// boundaries.
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const byFlag = new Set<boolean>();
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// Record elements now use pointer identity and cycle tracing.
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const recs = new Set<{ id: number }>();
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// Boolean elements also compile in Set-typed parameter slots.
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function useFlags(s: Set<boolean>): number {
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return s.size;
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}
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// Nullable Set arms compile and remain as working context.
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function maybeSet(cond: boolean): Set<string> | undefined {
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return undefined;
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}
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// Sets as array elements now preserve references without a diagnostic.
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const rows: Set<string>[] = [];
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// Sets 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 s = new Set<string>();
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console.log(JSON.stringify(s));
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// Set methods have no bound-value form — call them directly.
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const adder = s.add;
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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 Set<boolean>());
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maybeSet(true);
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