mirror of
https://github.com/vercel-labs/scriptc.git
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Chris Tate
bf21f47827
- Preserve async factory results and mixed table layouts through inference and destructuring. - Support checked Map and Object.fromEntries construction with native weak collections. - Keep native weak-key lifetimes and engine-backed collection identities intact.
47 lines
2.0 KiB
JavaScript
47 lines
2.0 KiB
JavaScript
const map = new WeakMap();
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const key = JSON.parse('{"name":"key"}');
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const other = JSON.parse('{"name":"key"}');
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const value = JSON.parse('{"count":1}');
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console.log(map.set(key, value) === map, map.get(key) === value, map.has(other));
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value.count++;
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console.log(map.get(key).count, map.delete(key), map.delete(key), map.get(key) === undefined);
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map.set(key, undefined);
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console.log(map.has(key), map.get(key) === undefined);
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map.set(key, 7);
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console.log(map.get(key));
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const bytes = new Uint8Array(4);
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const buffer = bytes.buffer;
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const keys = [key, JSON.parse('[]'), bytes, buffer, new WeakMap()];
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for (let i = 0; i < keys.length; i++) map.set(keys[i], i);
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for (const item of keys) console.log(map.get(item), map.has(item));
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console.log(map.get(bytes.buffer), map.get(bytes.subarray(0)) === undefined);
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function makeFunction(n) { return () => n; }
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const fn = makeFunction(3);
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console.log(map.set(fn, "function").get(fn), map.has(makeFunction(3)));
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function from(entries) { return new WeakMap(entries); }
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const entries = JSON.parse('[[null,1],[null,2]]');
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entries[0][0] = key;
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entries[1][0] = key;
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console.log(from(entries).get(key), from(null).has(key), from(undefined).has(key));
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const live = [];
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const pair = {};
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let reads = 0;
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Object.defineProperty(pair, "0", { get() { reads++; live.push([other, 9]); return key; } });
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Object.defineProperty(pair, "1", { get() { reads++; return 8; } });
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live.push(pair);
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const grown = from(live);
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console.log(reads, grown.get(key), grown.get(other));
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const invalid = [null, undefined, false, 1, "key"];
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for (const item of invalid) {
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console.log(map.has(item), map.get(item) === undefined, map.delete(item));
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try { map.set(item, 1); } catch (error) { console.log(error.name, error.message); }
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}
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for (const item of [[null], [1], [[null, 1]], "x", 7]) {
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try { from(item); } catch (error) { console.log(error.name, error.message); }
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}
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console.log(map.size === undefined);
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console.log(map instanceof WeakMap, map instanceof WeakSet, Object.prototype.toString.call(map));
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