@grail-ui/svelte/dist/coercion/number.js

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import { derived } from 'svelte/store';
export function derivedNumber(store, fallbackValue) {
    return derived(store, (storeValue) => coerceNumber(storeValue, fallbackValue));
}
export function coerceNumber(value, fallbackValue) {
    return isNumber(value) ? Number(value) : fallbackValue;
}
function isNumber(value) {
    return !isNaN(parseFloat(value)) && !isNaN(Number(value));
}