destroyLessCache.js

/*
 * This clears the LESS.js cache, since it aggressively caches @import statements.
 * Credit: Attaboy, https://gist.github.com/attaboy/1346280
 * Additional key checks and debugging output by A.B. Carroll. (http://github.com/nezzario)
 * License: Assumed MIT/BSD-like license, please give credit where credit is due.
 */

less.env = 'development';
console.log("If you are seeing this in a production environment you are likely doing something wrong or forgot to remove the destroyLessCache() script.");

function destroyLessCache(pathToCss) { // e.g. '/css/' or '/stylesheets/'
    if (!window.localStorage || !less || less.env !== 'development') {
        console.log('destroyLessCache(): Not destroying cache.  Either no local storage, LESS not loaded, or less.env not set to development');
        return;
    }
    var host = window.location.host;
    var protocol = window.location.protocol;
    var keyPrefix = protocol + '//' + host + pathToCss;

    for (var key in window.localStorage) {
        if (key.indexOf(keyPrefix) === 0 && (key.indexOf('.less', key.length - 5) !== -1 || key.indexOf('.less:timestamp', key.length - 15) !== -1)) {
            console.log('Deleted LESS Cache Key: ' + key);
            delete window.localStorage[key];
        }
    }
}

// You MUST put any path that contains LESS files that are being compiled here as separate function calls (or just add '/' if you feel it's safe).
destroyLessCache('/css/');