mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-10-23 06:10:02 +08:00
Chris Tate
6b6445ab90
- The ratified rename rider (world-unification §7 lane 5): "DOM" collided with the browser DOM and, post-lane-1, the structure is no longer a document tree. Comments and doc prose now say "the checked-dynamic tree" for the noun and "dyn" adjectivally; runtime symbol names (scr_dyn_*), the error.domClone libCall, and the real web DOMException family are unchanged. - The few user-facing strings carrying the nickname move with it (the structuredClone cyclic message, the dc subscriber/publish fences, two emitter ICE texts); diagnostics snapshots regenerated (96 pass). One private compiler constant (DOM_PROTO_METHOD_NAMES -> DYN_PROTO_METHOD_NAMES) rides along. - Mechanical sweep, 142 files, comments/prose only — no behavior change.
62 lines
2.0 KiB
JavaScript
62 lines
2.0 KiB
JavaScript
// The rest-forwarding idiom — `(...args) => from(...args)` — in the
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// checked-dynamic tier: a JS rest binding (a dyn array) spread-forwards
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// through the runtime-arity lane (the spread-marked dynCall: one fresh
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// argument array, flattened left-to-right, applied through the boxed
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// thunk with JS arity). Variants: forwarding to a function declaration,
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// to another closure, through a const re-binding, with leading fixed
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// params, chained rest-to-rest, and mixed spread positions. Non-iterable
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// spread sources throw V8's exact spread-call TypeError texts (the
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// nullish form spells the spread expression; everything else the generic
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// Spread-syntax text), catchably. Node is the oracle byte-for-byte.
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"use strict";
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function decl(a, b) {
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return a * 10 + b;
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}
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const clos = (a, b) => a + b;
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const fDecl = (...args) => decl(...args);
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const fClos = (...args) => clos(...args);
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const ref = clos;
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const fRef = (...args) => ref(...args);
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const fLead = (x, ...rest) => decl(x, ...rest);
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const fChain = (...args) => fClos(...args);
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const fMixed = (...args) => decl(...args, 7);
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console.log(fDecl(1, 2));
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console.log(fClos(3, 4));
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console.log(fRef(5, 6));
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console.log(fLead(7, 8));
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console.log(fChain(9, 10));
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console.log(fMixed(4));
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// JS arity through the runtime-arity lane: surplus dropped, missing are
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// undefined.
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const first = (x) => x;
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const fFirst = (...args) => first(...args);
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console.log(fDecl(1, 2, 3, 4));
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console.log(`${fFirst()}`);
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// Spread sources beyond the rest binding: strings iterate by code point,
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// arrays element-by-element.
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const fStr = (...args) => first(...args);
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console.log(fStr(..."ab"));
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console.log(fStr(...[["nested"], "tail"]));
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// V8's spread-call TypeError texts, catchably, evaluation order intact.
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function probe(v) {
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const g = (...args) => first(...args);
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try {
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return g(...v);
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} catch (err) {
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console.log("caught:", err.message);
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return null;
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}
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}
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probe(42);
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probe(null);
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probe(undefined);
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probe({});
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console.log("done");
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