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 | |
| */ | |
| } |
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Checkout https://www.typescriptlang.org/play?filetype=js#code/PQKhCgAIUgBAXAngBwKYBNUDNIG8B2qA7pABQB0lAhgE4DmAzgFyRX6IDaAugJSQC8APjwBfEZADCAe3wN4NAK4BjeFQBGAG1RQQwcOFARoceKgC2yDVVN5ps+ctWbU4gCo64tOpABCVBqh4riI6elgK+CoAljKQAOKo+Jg0ALJRAB5R+KR+ATy4UJBFNKjwCjT4kEpWDAzxicmQqOmmSXW5qAVF3d10pQlJqDSk+SE9ISGGHgjmltaBuHZyiirqWm7TXr7+C8Gh4OGR8DGVAHJUZqhpmdkd+YXFpeWV1f5155dNLQ3tO109vVKH1QI1wY26EwMYGmpgsVhsixky0caxckHcxlgWw6QTGugOEWisQAgn1rlkcjt7j0SmUKlUanVSYFmq10L8Av8AZA+vBmaDwUVIeBXrVIABlMqYfDwL5splkjIU4Hk7IDZKq0iiupgnh6rk80rgERAA