Source maps don't work for ncc run

[rauchg]

/private/var/folders/bm/grflgmxs62g01cd9m8sjjm740000gn/T/d41d8cd98f00b204e9800998ecf8427e/webpack:/test.js:4
throw new Error('test');
^
Error: test
    at Object.294 (/private/var/folders/bm/grflgmxs62g01cd9m8sjjm740000gn/T/d41d8cd98f00b204e9800998ecf8427e/webpack:/test.js:4:1)
    at __webpack_require__ (/private/var/folders/bm/grflgmxs62g01cd9m8sjjm740000gn/T/d41d8cd98f00b204e9800998ecf8427e/webpack:/webpack/bootstrap:19:1)
    at startup (/private/var/folders/bm/grflgmxs62g01cd9m8sjjm740000gn/T/d41d8cd98f00b204e9800998ecf8427e/webpack:/webpack/bootstrap:33:1)
    at /private/var/folders/bm/grflgmxs62g01cd9m8sjjm740000gn/T/d41d8cd98f00b204e9800998ecf8427e/webpack:/webpack/bootstrap:37:1
    at Object.<anonymous> (/private/var/folders/bm/grflgmxs62g01cd9m8sjjm740000gn/T/d41d8cd98f00b204e9800998ecf8427e/index.js:43:10)
    at Module._compile (internal/modules/cjs/loader.js:689:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
    at Module.load (internal/modules/cjs/loader.js:599:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
    at Function.Module._load (internal/modules/cjs/loader.js:530:3)

[rauchg]

They also don't seem to get loaded when using ncc build -s

[guybedford]

Believe it or not, what you are looking at is a completely working source map.

If you scroll all the way right, you can see webpack:/test.js:4:1 which represents the original source location.

When running ncc build -s the source map is outputted, but it will not actually run because Node.js does not support source maps. The only way to get them to "run" is via node -r source-map-support/register.js dist/index.js.

The three action items are:

1. There is an issue to automatically inline the behaviour of the source map in Automatically include source-map-support library into build #180.
2. When running ncc build x.js -s the source map file isn't coming up in the list of assets, even though it is there. This is an asset logging bug, will post a fix now.
3. It should be possible in Webpack to somehow remove the /private/var/folders/bm/grflgmxs62g01cd9m8sjjm740000gn/T/d41d8cd98f00b204e9800998ecf8427e/webpack: prefix in the source map.

@sokra any clues on how we could tackle (3) here to make the source map filename look less cluttered?

[guybedford]

This should be resolved now by #269 and #267.

Will aim to tackle #180 as well.