mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-10-02 08:35:07 +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.
49 lines
1.7 KiB
TypeScript
49 lines
1.7 KiB
TypeScript
// `u instanceof Uint8Array` on an `unknown` value: a runtime test of the
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// dyn's bytes kind, with tsc's narrowing typing the true branch (reads
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// bridge through the validated extraction). Buffer IS a Uint8Array in Node
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// and rides the same bytes kind here, so both worlds answer true for it.
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// The stdin toBytes(chunk: unknown) pattern.
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function toBytes(chunk: unknown): Uint8Array {
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if (typeof chunk === "string") return new TextEncoder().encode(chunk);
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if (chunk instanceof Uint8Array) return new Uint8Array(chunk);
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return new TextEncoder().encode(String(chunk));
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}
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const fromString = toBytes("hey");
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console.log(fromString.length, fromString[0]);
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const src = new Uint8Array([104, 105, 33]);
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const viaBytes = toBytes(src);
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console.log(viaBytes.length, viaBytes[0], viaBytes[1], viaBytes[2]);
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const viaBuffer = toBytes(Buffer.from("hi"));
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console.log(viaBuffer.length, viaBuffer[0], viaBuffer[1]);
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const viaNumber = toBytes(42);
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console.log(viaNumber.length);
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// The bare test as a value over every dyn kind, and negated flow.
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const u: unknown = src;
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const un: unknown = 7;
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const us: unknown = "hi";
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const uu: unknown = undefined;
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const ul: unknown = null;
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console.log(u instanceof Uint8Array);
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console.log(un instanceof Uint8Array);
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console.log(us instanceof Uint8Array);
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console.log(uu instanceof Uint8Array);
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console.log(ul instanceof Uint8Array);
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if (!(u instanceof Uint8Array)) {
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console.log("not bytes");
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} else {
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console.log("bytes", u.length);
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}
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// Narrowed reads through a helper: length summed over mixed unknowns.
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function bytesLen(v: unknown): number {
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if (v instanceof Uint8Array) return v.length;
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return 0;
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}
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console.log(bytesLen(new Uint8Array([1, 2, 3])) + bytesLen("str") + bytesLen(5) + bytesLen(Buffer.from("ab")));
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