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Malte UblandClaude Opus 5.5
db68255cbc
- `s.match(re) ?? []` / `|| []` made typescript-go's API panic whenever the
union's members were serialized (the empty literal is a tuple clone
without tuple data), poisoning the statement with SC0004. The members
of the union's widened type are readable and describe the same values,
so constituent reads answer with them; the empty tuple beside a match
array is one of its values. `checker-panic-tuple.ts` compiles and moves
to the corpus.
- Spreading a fixed tuple into an array literal copies its positions
into the literal's element type.
- fs.Stats values are an array element kind, so `Promise.all` over
`stat()` promises and `Stats[].reduce` compile.
- `.then(String)`, `.then(Number)` and `.then(Boolean)` over a number or
boolean settled value convert it through an interned closure.
- Inspecting (util.format, %s, util.inspect) an Error-typed value whose
runtime class declares fields prints the stackless base with Node's
constructor-name header (`[Bailable [Error]: m]`) and the own
properties, `[Bailable [Error]: m] { bail: true }`; it was refused. A
subclass whose own fields cannot render (functions, or a field Node's
error inspector treats specially) throws a named refusal on its own
instances only.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
13 lines
600 B
TypeScript
13 lines
600 B
TypeScript
// Spreading a fixed tuple into an array literal copies its positions in
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// order into the literal's element type.
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const SCRIPT_FILES: [string, string, string, string, string] = ["a.ts", "a.mts", "a.cts", "a.js", "a.mjs"];
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const DATA_FILES = ["a.json"];
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const files = [...SCRIPT_FILES, ...DATA_FILES];
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console.log(files.length, files.join(","));
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const PAIR = ["x", "y"] as const;
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const more: string[] = [...PAIR, "z", ...SCRIPT_FILES.slice(0, 1)];
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console.log(more);
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const numbers: [number, number, number] = [1, 2, 3];
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const widened: (number | string)[] = [...numbers, "end"];
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console.log(widened);
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