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https://github.com/vercel-labs/scriptc.git
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Chris Tate
97a489845a
- Carry BigInts, Sets, and regular expressions through checked native storage without a JavaScript engine. - Preserve dictionary aliases, spreads, frozen metadata, and fluent initialization helpers. - Collect checked object and closure cycles while preserving live references.
30 lines
1.6 KiB
JavaScript
30 lines
1.6 KiB
JavaScript
const object = Object.create(null);
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object.value = 1;
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object.nested = { value: 1 };
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let calls = 0;
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let setting = 0;
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Object.defineProperty(object, "accessor", { get() { calls++; return setting; }, set(value) { setting = value; }, configurable: true });
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console.log(Object.isFrozen(object), Object.freeze(object) === object, Object.isFrozen(object), calls);
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object.accessor = 4;
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console.log(object.accessor, calls);
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object.nested.value = 2;
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console.log(object.nested.value);
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for (const field of ["value", "accessor"]) {
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const descriptor = Object.getOwnPropertyDescriptor(object, field);
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console.log(descriptor.configurable, descriptor.writable);
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}
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try { object.value = 2; } catch (error) { console.log("write", error.name); }
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try { object.extra = 2; } catch (error) { console.log("add", error.name, error.message); }
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try { delete object.value; } catch (error) { console.log("delete", error.name); }
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try { Object.defineProperty(object, "value", { value: 2 }); } catch (error) { console.log("redefine", error.name); }
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try { Object.defineProperty(object, "extra", { value: 2 }); } catch (error) { console.log("define", error.name, error.message); }
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try { Object.assign(object, { extra: 2 }); } catch (error) { console.log("assign", error.name, error.message); }
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console.log(object.value, Object.keys(object).join(","), Object.freeze(object) === object);
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for (const value of [0n, 1, true, "hello", undefined, null]) console.log(Object.freeze(value) === value, Object.isFrozen(value));
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const original = Object.create(null);
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original.value = 1;
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const clone = structuredClone(Object.freeze(original));
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console.log(Object.isFrozen(clone));
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clone.value = 2;
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console.log(clone.value);
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