mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-10-02 08:35:07 +08:00
Chris Tate
e24c8a14dc
- Preserve fields, accessors, added properties, and cyclic references across untyped class boundaries. - Support platform signal names and native exception handlers that resume queued work.
56 lines
2.0 KiB
JavaScript
56 lines
2.0 KiB
JavaScript
"use strict";
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// An opaque field does not prevent reading or updating the other properties
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// of the same native instance through an untyped package boundary.
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class Base {
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cache = new Map();
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width = 40;
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child = { value: 1 };
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events = [];
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get size() {
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this.events.push("get");
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return this.width * 2;
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}
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set size(value) {
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this.events.push("set");
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this.width = value / 2;
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}
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}
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class Renderer extends Base {
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height = 24;
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get label() { return `size:${this.width}`; }
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}
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const renderer = new Renderer();
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renderer.cache.set("kept", 7);
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const view = /** @type {unknown} */ (renderer);
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console.log("dimensions", view.width, view.height, view.size, view.label);
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view.width = 60;
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view.size = 160;
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console.log("updates", renderer.width, view.width, view.size, view.label);
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console.log("state", renderer.cache.get("kept"), renderer.events.join(","));
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console.log("same", view === renderer);
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console.log("missing", view.generation === undefined);
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view.generation = 1;
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const again = /** @type {unknown} */ (renderer);
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console.log("shared", again.generation);
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again.generation = 2;
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console.log("shared update", view.generation);
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view.child.value = 9;
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console.log("child", renderer.child.value, view.child === again.child);
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for (const key of ["width", "height", "size", "label", "generation"]) console.log("computed", key, view[key]);
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for (const key of ["width", "generation"]) view[key] = 100;
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console.log("computed update", renderer.width, view.generation);
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try { view.label = "changed"; } catch (error) { console.log("readonly", error.name, error.message); }
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class Data {
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first = 1;
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second = 2;
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}
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const data = new Data();
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const record = /** @type {unknown} */ (data);
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record.extra = 3;
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console.log("keys", Object.keys(record).join(","));
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console.log("json", JSON.stringify(record));
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console.log("descriptor", JSON.stringify(Object.getOwnPropertyDescriptor(record, "extra")));
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Object.assign(record, { first: 4, appended: 5 });
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console.log("assigned", data.first, record.extra, record.appended, JSON.stringify(record));
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