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const { random } = require('@lukeed/csprng');
var IDX=256, HEX=[], SIZE=256*16, BUFFER;
while (IDX--) HEX[IDX] = (IDX + 256).toString(16).substring(1);
function uid(len) {
var str='', tmp=(len || 11), num=(1+tmp) / 2 | 0;
if (!BUFFER || ((IDX + num) > SIZE)) {
BUFFER = random(SIZE);
IDX = 0;
}
while (num--) {
str += HEX[BUFFER[IDX++]];
}
return str.substring(0, tmp);
}
exports.uid = uid;