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https://github.com/vercel-labs/scriptc.git
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Malte Ubl
947c9bcf3f
- NoThrow diagnostics name compiler-resolved Node errors (class and message) and explain parameters the frontend compiles as T | undefined because a caller passes a possibly missing value (for example xs[i]!), naming that call. - Synthetic dynamic-class helpers (%dyn.*) carry the location of the code that first needed them; they are no longer bound to annotations there. - Int32 hints only parenthesize where needed; the NoThrow hint no longer suggests try/catch, which does not discharge the contract. - Diagnostics snapshots and TypeScript preflight/order baselines for the new fixtures. - Docs: /docs/contracts and a limitations entry.
35 lines
1.1 KiB
TypeScript
35 lines
1.1 KiB
TypeScript
// NoThrow contracts that do not hold: each diagnostic names the path from
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// the annotated function to the operation that can throw.
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import type { NoThrow } from "@scriptc/types";
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function parseDigit(ch: string): number {
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const code = ch.charCodeAt(0) - 48;
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if (code < 0 || code > 9) throw new RangeError(`not a digit: ${ch}`);
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return code;
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}
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function sumDigits(text: string): NoThrow<number> {
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let sum = 0;
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for (let i = 0; i < text.length; i++) sum += parseDigit(text[i]!);
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return sum;
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}
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function depth(n: number): NoThrow<number> {
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return n <= 0 ? 0 : 1 + depth(n - 1);
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}
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function apply(f: (x: number) => number, x: number): NoThrow<number> {
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return f(x);
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}
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// The source type says `string`, but a caller passes a non-null asserted
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// element that can be missing; Node then throws inside the callee, so the
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// parameter is compiled as `string | undefined` and the read can throw.
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function width(text: string): NoThrow<number> {
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return text.length;
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}
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const words = "a b".split(" ");
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console.log(sumDigits("123"), depth(3), apply((x) => x + 1, 1), apply((x) => parseDigit(String(x)), 2));
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console.log(width(words[0]!), width(words[1]!));
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