36 lines
869 B
JavaScript
36 lines
869 B
JavaScript
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//@ts-check
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/**
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* Creates a document state object that can toggle between exclusive states.
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* All passed states' css classnames will be prepended with `mode-`.
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* @param {string[]} states
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*/
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export const documentState = (states) => {
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const all = states.map((state) => `mode-${state}`);
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/**
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* @param {any} state
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* @returns {state is number}
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*/
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const isValidIndex = (state) =>
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typeof state === "number" && state >= 0 && state < all.length;
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/**
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* @param {number} state
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*/
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const is = (state) =>
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isValidIndex(state) && document.body.classList.contains(all[state]);
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/**
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* @param {number|undefined|null|false} state
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*/
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const set = (state = false) => {
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document.body.classList.remove(...all);
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isValidIndex(state) && document.body.classList.add(all[state]);
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};
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return { set, is };
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};
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export default documentState;
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