@grail-ui/svelte/dist/util/id.js

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// Generate a unique id (unique within the entire client session).
// Useful for temporary DOM ids.
const idCounter = {};
export function uniqueId(prefix = 'uid') {
    if (!(prefix in idCounter)) {
        idCounter[prefix] = 0;
    }
    return `${prefix}_${++idCounter[prefix]}`;
}