mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-10-21 05:50:55 +08:00
Chris Tate
1f10e83720
- Preserve callback identity, receiver binding, and class references across unions and collections. - Track record field presence independently of undefined values and improve native runtime behavior. - Expand differential coverage and streamline CI bootstrap and compiler rebuild checks.
44 lines
1.5 KiB
TypeScript
44 lines
1.5 KiB
TypeScript
class Base { value = 1; }
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class Child extends Base {
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extra = 2;
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read(): number { return this.value + this.extra; }
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}
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class Named { name = "named"; }
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type Value = Base | Named | string;
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function isChild(value: Value): value is Child { return value instanceof Child; }
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function inspect(value: Value): number {
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const keep = (): Value => value;
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keep();
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if (isChild(value)) {
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value.extra += 3;
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return value.read();
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}
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return -1;
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}
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function asserted(value: Value): number {
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const keep = (): Value => value;
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keep();
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return (value as Child).read();
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}
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const child = new Child();
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const values: Value[] = [child, new Named(), "text", new Base()];
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for (const value of values) console.log(inspect(value));
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console.log(asserted(values[0]));
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for (const value of values) {
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if (isChild(value)) console.log(value.extra, value.read(), value === child);
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}
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const selected = values.filter((value) => value instanceof Child);
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console.log(selected[0] === child, selected[0]!.read());
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console.log(values.find((value) => value instanceof Child) === child);
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console.log(values.findLast((value) => value instanceof Child) === child);
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const empty: Value[] = [];
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console.log(empty.find((value) => value instanceof Child) === undefined);
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const changed: Value[] = [child, new Child(), "text"];
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const kept = changed.filter((value, index, array) => {
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array[index] = "replaced";
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return value instanceof Child;
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});
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console.log(kept.length, kept[0] === child, changed[0] === "replaced");
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try { asserted(values[20]); } catch (error) { console.log(error instanceof TypeError); }
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