issue adding plugin to .babelrc

[chalda]

Hi there, trying to get your module working in attempt to fix some linenumber issues with mocha/babel.

getting the follow error:

Error: Cannot find module 'source-map-support/register'
    at Function.Module._resolveFilename (module.js:469:15)
    at Function.Module._load (module.js:417:25)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)

have the following .babelrc file where the plugin is being used:

{
  "presets": ["es2015", "react", "stage-0"],
  "plugins": ["transform-object-rest-spread", "transform-decorators-legacy", "transform-class-properties"],
  "env": {
    "test": {
      "presets": ["es2015", "react", "stage-0"],
      "plugins": ["transform-object-rest-spread", "transform-decorators-legacy", "transform-class-properties", "rewire", "source-map-support"],
      "sourceMaps": "both"
    }
  }
}

and the test is run with babel-instanbul
"test:unit": "cross-env NODE_ENV=test babel-node node_modules/.bin/babel-istanbul cover --config=istanbul.json --dir coverage/unit node_modules/.bin/_mocha -- --require node_modules/ignore-styles 'client/**/*.spec.unit.js'",

its possible the error is coming from babel-istanbul as that tool is somewhat outdated.

[chocolateboy]

Error: Cannot find module 'source-map-support/register'

You need to install the source-map-support module:

In conjunction with the source-map-support module, which must be installed separately, this statement hooks into the v8 stack-trace API to translate call sites in the transpiled code back to their corresponding locations in the original code.

[chalda]

ahh musta missed it. my bad. why not install that module as a dependency or at least indicate it as a peer?

[chocolateboy]

Babel runs at compile time, and the dependency is needed at runtime. In practice you'll usually be bundling source-map-support locally for development and disabling it for production, in which case it would make sense to peer-depend on it, but that's just a convention, not an intrinsic requirement of this plugin.

For example, a project could be compiled in one environment (source-map-support not needed), tested in a CI environment (source-map-support needed), and deployed to another (source-map-support not needed).