You are currently looking at the v6.0 - v8.2 docs (Reason v3.6 syntax edition). You can find the latest API docs here.
(These docs cover all versions between v3 to v8 and are equivalent to the old BuckleScript docs before the rebrand)
Console
Provide console (logging) utilities.
log
RElet log: 'a => unit;
RElet log2: ('a, 'b) => unit;
RElet log3: ('a, 'b, 'c) => unit;
RElet log4: ('a, 'b, 'c, 'd) => unit;
RElet logMany: array('a) => unit;
info
RElet info: 'a => unit;
RElet info2: ('a, 'b) => unit;
RElet info3: ('a, 'b, 'c) => unit;
RElet info4: ('a, 'b, 'c, 'd) => unit;
RElet infoMany: array('a) => unit;
warn
RElet warn: 'a => unit;
RElet warn2: ('a, 'b) => unit;
RElet warn3: ('a, 'b, 'c) => unit;
RElet warn4: ('a, 'b, 'c, 'd) => unit;
RElet warnMany: array('a) => unit;
error
RElet error: 'a => unit;
RElet error2: ('a, 'b) => unit;
RElet error3: ('a, 'b, 'c) => unit;
RElet error4: ('a, 'b, 'c, 'd) => unit;
RElet errorMany: array('a) => unit;
trace
RElet trace: unit => unit;
timeStart
RElet timeStart: string => unit;
timeEnd
RElet timeEnd: string => unit;