Why does karma preprocessor not properly parse CoffeeScript? - coffeescript

Question

I have:
$http
url: '/api/v1/session/check'
method: 'POST'
data: sessionCheck
.success (response) =>
if response.authenticated is true
#user = response.user
deferred.resolve response
.error (data, status, headers, config) ->
deferred.reject data
throw {
data: data
status: status
headers: headers
config: config
}
And in my karma.conf.coffee, I have:
preprocessors:
'public/scripts/**/*.coffee': ['coverage']
'test/webapp/unit/**/*.coffee': ['coffee']
singleRun: true
reporters: ['story', 'coverage']
coverageReporter:
type: 'html'
dir: 'test/webapp/coverage/'
But when I run my test, I get an error saying:
ERROR [preprocessor.coverage]: Syntax error on line 59, column 8: unexpected '.' (\u002E)
56 : url: '/api/v1/session/check'
57 : method: 'POST'
58 : data: sessionCheck
59 : .success (response) =>
^^ :~~~~~~~~^
60 : if response.authenticated is true
61 : #user = response.user
62 :
Which, of course, makes no sense to me. Because if I change the code to:
$http(
url: '/api/v1/session/check'
method: 'POST'
data: sessionCheck
).success((response) =>
if response.authenticated is true
#user = response.user
deferred.resolve response
).error((data, status, headers, config) ->
deferred.reject data
throw {
data: data
status: status
headers: headers
config: config
}
)
then it works fine. Those 2 snippets of CoffeeScript compile to identical JavaScript, so what gives?

Answer 1

Are you using the latest karma-coffee-preprocessor?
Looks like your karma preprocessor uses outdated version of coffeescript (<1.7).
Method chaining without parenthesis was added only in 1.7, which came out not so long ago.