Babel sourcemaps support

[ghost]

Hi,

Thanks for this. Cucumber + javascript = awesome.

I'm using babel as a compiler. Is there a way that I can tell cucumberjs to use the sourcemaps?

[charlierudolph]

Use them in what way? In my experience with other compilers, they hook automatically to error stacks. If cucumber-js is loading the babel files, I expect the sourcemaps to be used.

[ghost]

I must confess, I really don't know much about how source maps work. All I know is when I include them in the directory I'm serving the browser automagically figures it out by looking at the source maps comment at the bottom of the generated file. It seems however that node doesn't figure it out just by it self. I had to use node-source-map-support to get node to understand the source-maps of a little test program I wrote.

Looking at it more carefully though it seems that cucumber js is figuring out where to find the source maps for the error but it's reporting the incorrect line for the step definition. See below:

Scenario:  - test/functional/generateNodeModule/byAnsweringQuestions.feature:5
   Step: When the generator is run without options - test/functional/generateNodeModule/byAnsweringQuestions.feature:6
   Step Definition: test/functional/generateNodeModule/steps.js:217
  Error: This is a fail
         at _callee6$ (run.js:135:11)
         at tryCatch (/Users/Marthinus/Code/platform/sbg-component-generator/node_modules/babel-regenerator-runtime/runtime.js:61:40)

The correct line for the step definition is 77.
Line 135 in run.js is correct however for the error.

[charlierudolph]

Hmm, can you please provide a sample project setup so I can reproduce?

[ghost]

Will put something together.

[ghost]

Ok, clone this. You can read the instructions on the README. I actually don't expect it to do anything else because I'm not telling it where to find or how to produce source maps.

[charlierudolph]

I get the following output when running on node 6

> cucumber_no_source_map@1.0.0 test /Users/charlesrudolph/github/cucumber_no_source_map
> cucumber-js --format summary --compiler js:babel-register tests/

when block
and block
Failures:

1) Scenario:  - tests/test.feature:4
   Step: Then It should give the correct step definition line number - tests/test.feature:7
   Step Definition: tests/steps.js:15
   Message:
     Error: Error on the it block
         at World._callee$ (steps.js:12:15)
         at tryCatch (/Users/charlesrudolph/github/cucumber_no_source_map/node_modules/babel-regenerator-runtime/runtime.js:61:40)
         at GeneratorFunctionPrototype.invoke [as _invoke] (/Users/charlesrudolph/github/cucumber_no_source_map/node_modules/babel-regenerator-runtime/runtime.js:329:22)
         at GeneratorFunctionPrototype.prototype.(anonymous function) [as next] (/Users/charlesrudolph/github/cucumber_no_source_map/node_modules/babel-regenerator-runtime/runtime.js:94:21)
         at step (/Users/charlesrudolph/github/cucumber_no_source_map/tests/steps.js:3:191)
         at /Users/charlesrudolph/github/cucumber_no_source_map/tests/steps.js:3:451

The line appears correct to me.

[ghost]

There is no line 15 in steps.js. Step Definition: tests/steps.js:15

[bdo]

@marthinus-engelbrecht steps.js:12:15 indicates line 12 column 15, so it seems to be working properly (at least on node 6)

[charlierudolph]

The error stack (Message: line) works properly but when we try to determine the location of the step (Step Definition: line) the source map doesn't appear to be taken into account

[bdo]

Oh I see. My bad.

[charlierudolph]

Fixed in 1d02c6a

[ghost]

Awesome 👍

[lock]

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