mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-10-31 07:23:06 +08:00
Chris Tate
4070ef701c
* fix(compiler): unblock self-hosting analysis and tuple construction - Bound type diagnostics to handle deeply nested and shared compiler types. - Compile fixed tuple spreads and preserve const tuple inference under satisfies. - Add native compiler-component and differential regression coverage. * fix(tests): record tuple spread frontend parity baseline - Record module order and preflight diagnostics for the new tuple spread regression fixture.
42 lines
1.5 KiB
TypeScript
42 lines
1.5 KiB
TypeScript
// Tuple + ref-element-array fences — what stays OUT of the new surface and
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// why: dynamic tuple indexing (heterogeneous positions have no single
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// element type), optional/rest tuple elements (no fixed shape), variable-length
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// spreads into tuple literals, join on ref-element arrays (JS would
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// recursively toString), and Map-element arrays (hashed storage has no
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// element representation in the array runtime).
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const pair: [string, number] = ["a", 1];
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// Dynamic index: reads and writes both need the literal-index shape.
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let i = 0;
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console.log(pair[i]);
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pair[i] = "b";
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// Optional and rest elements have no fixed arity/shape.
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const opt: [string, number?] = ["x"];
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const rest: [string, ...number[]] = ["y", 1, 2];
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// Heterogeneous tuples ITERATE now (positions snapshot into the union),
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// and the union-typed loop variable PRINTS (per-arm console rendering).
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for (const part of pair) {
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console.log(part);
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}
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// An array's runtime length cannot determine a fixed tuple's positions.
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const copy = [...(["a", 1] as (string | number)[])] as [string, number];
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// The arity constant folds only off side-effect-free receivers.
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function mk(): [string, number] {
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return ["z", 9];
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}
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console.log(mk().length);
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// join on ref-element arrays: JS would recursively toString — dishonest.
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const recs: { id: number }[] = [{ id: 1 }];
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console.log(recs.join(","));
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const tuples: [string, string][] = [["k", "v"]];
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console.log(tuples.join(";"));
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// Map elements stay out entirely (function elements compile — the REF
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// element kind).
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const maps: Map<string, number>[] = [];
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