GoToLoop

//module.exports = function(options, undef) {
  "use strict";

  const TAU = 2 * Math.PI,
        lerp = (start, stop, amt = 0) => +start + amt*(stop - start),
        sq = n => n*n,
        pjsCheck = obj => obj != null && 'noLoop' in obj,
        argsErr = (mtd, len, min) => {
          throw `Too few args passed to ${mtd}() [${len} < ${min}].`;
        };