Created
July 15, 2020 14:17
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Mixin annotation with JSDoc and TypeScript
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| import { LitElement } from 'https://cdn.pika.dev/lit-element@^2.3.1'; | |
| /** @typedef {new (...args: any[]) => any} Constructor */ | |
| /** | |
| * @template {!Constructor} T | |
| * @param {T} superclass - The class to extend | |
| */ | |
| const FormControlMixin = (superclass) => | |
| class FormControl extends superclass { | |
| /** @type {boolean} */ | |
| get checkValidity() { | |
| return /* some magic */ | |
| } | |
| } | |
| /** | |
| * @template FormControlMixin, LitElement | |
| */ | |
| class MyInput extends FormControlMixin(LitElement) { | |
| /** | |
| * TypeScript now recognizes this has checkValidity | |
| * as well as all of LitElement's classes | |
| */ | |
| } |
I tried it with two mixins, and it didn't work as expected.
Yeah, it’sa bit of I think. I’ll try to update.
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Wow, it is so great that TypeScript mixins are supported in plain JS with JSDoc now! Yes!! I think for a while this was not possible without the
{!Constructor}syntax to enforce that T extends from that.