$ eslint .

lib/cli.js
  20:9  error  Illegal return statement

lib/middleware/auth.js
   1:4   error  request is defined but never used   no-unused-vars
   5:4   error  os is defined but never used        no-unused-vars
   6:4   error  url is defined but never used       no-unused-vars
   7:4   error  parseUrl is defined but never used  no-unused-vars
  31:25  error  Expected error to be handled        handle-callback-err

lib/middleware/confirm.js
   1:4   error  pkg is defined but never used  no-unused-vars
  13:95  error  Expected error to be handled   handle-callback-err

lib/middleware/creds.js
  1:4  error  path is defined but never used   no-unused-vars
  2:4  error  fs is defined but never used     no-unused-vars
  3:4  error  netrc is defined but never used  no-unused-vars

lib/middleware/deploy.js
    1:4  error  fs is defined but never used          no-unused-vars
    4:4  error  localCreds is defined but never used  no-unused-vars
    5:4  error  prompt is defined but never used      no-unused-vars
    9:4  error  surge is defined but never used       no-unused-vars
  115:6  error  verbose is defined but never used     no-unused-vars

lib/middleware/domain.js
  14:4  error  Expected an assignment or function call and instead saw an expression  no-unused-expressions
  15:8  error  domain was used before it was defined                                  no-use-before-define
  30:7  error  Expected error to be handled                                           handle-callback-err

lib/middleware/email.js
  20:7  error  Expected error to be handled  handle-callback-err

lib/middleware/ipaddress.js
  3:18  error  Empty block statement  no-empty

lib/middleware/logout.js
  7:8  error  creds is defined but never used  no-unused-vars

lib/middleware/pkg.js
  3:20  error  Use path.join() or path.resolve() instead of + to create paths  no-path-concat

lib/middleware/prep.js
  17:32  error  e is defined but never used  no-unused-vars

lib/middleware/project.js
  33:9  error  Expected error to be handled  handle-callback-err

lib/middleware/shorthand.js
  1:4  error  path is defined but never used     no-unused-vars
  2:4  error  fs is defined but never used       no-unused-vars
  3:4  error  helpers is defined but never used  no-unused-vars

lib/middleware/size.js
   1:4   error  du is defined but never used  no-unused-vars
  28:21  error  Expected error to be handled  handle-callback-err

lib/middleware/tokencheck.js
  1:4  error  request is defined but never used   no-unused-vars
  4:4  error  prompt is defined but never used    no-unused-vars
  5:4  error  os is defined but never used        no-unused-vars
  6:4  error  url is defined but never used       no-unused-vars
  7:4  error  parseUrl is defined but never used  no-unused-vars

lib/middleware/util/helpers.js
  58:4  error  fetchToken is defined but never used  no-unused-vars

lib/middleware/util/skin.js
  8:2   error  Expected error to be handled   handle-callback-err
  8:16  error  err is defined but never used  no-unused-vars

lib/middleware/whitelist.js
  7:7   error  'param' is not defined  no-undef
  8:14  error  'param' is not defined  no-undef

✖ 40 problems (40 errors, 0 warnings)