This is a .jshintrc which ignores all warnings but prints all errors (list is correct as of date published, based on https://github.com/jshint/jshint/blob/master/src/messages.js)

.jshintrc

{
  "-W001": false,
  "-W002": false,
  "-W003": false,
  "-W004": false,
  "-W005": false,
  "-W006": false,
  "-W007": false,
  "-W008": false,
  "-W009": false,
  "-W010": false,
  "-W011": false,
  "-W012": false,
  "-W013": false,
  "-W014": false,
  "-W015": false,
  "-W016": false,
  "-W017": false,
  "-W018": false,
  "-W019": false,
  "-W020": false,
  "-W021": false,
  "-W022": false,
  "-W023": false,
  "-W024": false,
  "-W025": false,
  "-W026": false,
  "-W027": false,
  "-W028": false,
  "-W030": false,
  "-W031": false,
  "-W032": false,
  "-W033": false,
  "-W034": false,
  "-W035": false,
  "-W036": false,
  "-W037": false,
  "-W038": false,
  "-W039": false,
  "-W040": false,
  "-W041": false,
  "-W042": false,
  "-W043": false,
  "-W044": false,
  "-W045": false,
  "-W046": false,
  "-W047": false,
  "-W048": false,
  "-W049": false,
  "-W050": false,
  "-W051": false,
  "-W052": false,
  "-W053": false,
  "-W054": false,
  "-W055": false,
  "-W056": false,
  "-W057": false,
  "-W058": false,
  "-W059": false,
  "-W060": false,
  "-W061": false,
  "-W062": false,
  "-W063": false,
  "-W064": false,
  "-W065": false,
  "-W066": false,
  "-W067": false,
  "-W068": false,
  "-W069": false,
  "-W070": false,
  "-W071": false,
  "-W072": false,
  "-W073": false,
  "-W074": false,
  "-W075": false,
  "-W076": false,
  "-W077": false,
  "-W078": false,
  "-W079": false,
  "-W080": false,
  "-W081": false,
  "-W082": false,
  "-W083": false,
  "-W084": false,
  "-W085": false,
  "-W086": false,
  "-W087": false,
  "-W088": false,
  "-W089": false,
  "-W090": false,
  "-W091": false,
  "-W093": false,
  "-W094": false,
  "-W095": false,
  "-W096": false,
  "-W097": false,
  "-W098": false,
  "-W099": false,
  "-W100": false,
  "-W101": false,
  "-W102": false,
  "-W103": false,
  "-W104": false,
  "-W105": false,
  "-W106": false,
  "-W107": false,
  "-W108": false,
  "-W109": false,
  "-W110": false,
  "-W112": false,
  "-W113": false,
  "-W114": false,
  "-W115": false,
  "-W116": false,
  "-W117": false,
  "-W118": false,
  "-W119": false,
  "-W120": false,
  "-W121": false,
  "-W122": false,
  "-W123": false,
  "-W124": false,
  "-W125": false,
  "-W126": false,
  "-W127": false,
  "-W128": false,
  "-W129": false,
  "-W130": false,
  "-W131": false,
  "-W132": false,
  "-W133": false,
  "-W134": false,
  "-W135": false,
  "-W136": false,
  "-W137": false,
  "-W138": false
}