Beefy swallows useful errors

[konsumer]

If I run browserify, with some problematic code, I get this totally useful error message:

SyntaxError: /home/konsumer/Desktop/project/src/Game.js: Unexpected token (3:19)
  1 | import raf from 'raf'
  2 |
> 3 | import TextConsole {VGA} from './TextConsole'
    |                    ^
  4 |
  5 | export const ZInputEvent = {
  6 |   USE_TORCH: 1,
    at Parser.pp.raise (/home/konsumer/Desktop/project/node_modules/babylon/lib/parser/location.js:22:13)
    at Parser.pp.unexpected (/home/konsumer/Desktop/project/node_modules/babylon/lib/parser/util.js:91:8)
    at Parser.pp.expectContextual (/home/konsumer/Desktop/project/node_modules/babylon/lib/parser/util.js:59:39)
    at Parser.pp.parseImport (/home/konsumer/Desktop/project/node_modules/babylon/lib/parser/statement.js:968:10)
    at Parser.pp.parseStatement (/home/konsumer/Desktop/project/node_modules/babylon/lib/parser/statement.js:134:65)
    at Parser.pp.parseBlockBody (/home/konsumer/Desktop/project/node_modules/babylon/lib/parser/statement.js:500:21)
    at Parser.pp.parseTopLevel (/home/konsumer/Desktop/project/node_modules/babylon/lib/parser/statement.js:29:8)
    at Parser.parse (/home/konsumer/Desktop/project/node_modules/babylon/lib/parser/index.js:98:17)
    at Object.parse (/home/konsumer/Desktop/project/node_modules/babylon/lib/index.js:44:50)
    at File.parse (/home/konsumer/Desktop/project/node_modules/babel-core/lib/transformation/file/index.js:480:24)

The same error with beefy looks like this much less helpful error:

buffer.js:237
    buf.copy(buffer, pos);
        ^

TypeError: buf.copy is not a function
    at Function.Buffer.concat (buffer.js:237:9)
    at Stream.end (/home/konsumer/Desktop/project/node_modules/beefy/lib/accumulate-error.js:25:26)
    at _end (/home/konsumer/Desktop/project/node_modules/through/index.js:61:9)
    at Stream.stream.end (/home/konsumer/Desktop/project/node_modules/through/index.js:70:5)
    at Stream.onend (stream.js:59:10)
    at emitNone (events.js:72:20)
    at Stream.emit (events.js:166:7)
    at drain (/home/konsumer/Desktop/project/node_modules/through/index.js:33:23)
    at Stream.stream.queue.stream.push (/home/konsumer/Desktop/project/node_modules/through/index.js:41:5)
    at Stream.end (/home/konsumer/Desktop/project/node_modules/through/index.js:17:35)

[konsumer]

The first error tells me that I need a comma in my import statement, the second tells me that reading some buffer failed.

[pfhayes]

+1 - is this expected behaviour or should there be a useful error message here?

[pfhayes]

I've submitted a PR here: #103