https://kangax.github.io/compat-table/es2016plus/
uc 13.1.2: 60%
ch57: 33%
ch61: 45%
ch62: 51%
ch63: 60%
ch65: 60%
ch66: 66%
ch67: 70%
ch69: 73%
ch74: 89%
It seems that UC Browser 13.1.2, despite advertising as Chrome/57
, is based on Chrome 63, 64, or 65, but with ES modules disabled (they are enabled in Chrome 61).