@typed/effects
Version:
Generator-powered Effect management
37 lines • 1.35 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.createFiber = void 0;
const disposable_1 = require("@typed/disposable");
const promises_1 = require("@typed/promises");
// Creates a fiber that automatically reacts to the mutation of its current info
// Makes use of ES2015 Proxy, if required the available Proxy polyfills _should_ work for this use case.
function createFiber() {
const disposable = disposable_1.Disposable.lazy();
const [promise, resolve, reject] = promises_1.createDeferred();
const handleFiberInfo = (info) => {
if (info.state === 2 /* Error */) {
return reject(info.error);
}
if (info.state === 1 /* Returned */) {
return resolve(info.value);
}
};
// Besides observing when info is changed, it also coincidentally makes our fiber actually immutable for it's other fields
function setFiberKey(target, key, value) {
if (key === 'info') {
handleFiberInfo(value);
target[key] = value;
return true;
}
return false;
}
const fiber = new Proxy({
info: { state: 0 /* Running */, promise },
...disposable,
}, {
set: setFiberKey,
});
return fiber;
}
exports.createFiber = createFiber;
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