code transformation fails

[silkentrance]

Given the following source

function ProtoError(message) {
    this._base = new Error(message);
}

ProtoError.prototype = new Error();
Object.setPrototypeOf(ProtoError, Error);

export default class EsError extends ProtoError
{
    constructor(message)
    {   
        super(message);
    }   

    get message()
    {   
        return this._base.message;
    }   

    toString()
    {   
        return '[' + this.constructor.name + ': ' + this.message + ']'; 
    }   
}

and trying to generate coverage information for it using the following dummy test case

import EsError from 'error';

babel-istanbul will fail and output the following debug info/stack trace

gathering coverage data...
Transformation error; return original code
{ [SyntaxError: /var/workspaces/coldrye/coldrye-es/esbases/esbases/src/error.es: super() is only allowed in a derived constructor]
  loc: Position { line: 15, column: 8 },
  _babel: true,
  codeFrame: '\u001b[0m  13 |     constructor\u001b[34m\u001b[1m(\u001b[22m\u001b[39mmessage\u001b[34m\u001b[1m)\u001b[22m\u001b[39m\n  14 |     \u001b[32m{\u001b[39m\n> 15 |         \u001b[36msuper\u001b[39m\u001b[34m\u001b[1m(\u001b[22m\u001b[39mmessage\u001b[34m\u001b[1m)\u001b[22m\u001b[39m\u001b[1m;\u001b[22m\n     |         ^\n  16 |     \u001b[32m}\u001b[39m\n  17 | \n  18 |     get message\u001b[34m\u001b[1m(\u001b[22m\u001b[39m\u001b[34m\u001b[1m)\u001b[22m\u001b[39m\u001b[0m' }
=============================================================================
Writing coverage object [/var/workspaces/coldrye/coldrye-es/esbases/esbases/build/cover/coverage.json]
Writing coverage reports at [/var/workspaces/coldrye/coldrye-es/esbases/esbases/build/cover]
=============================================================================

=============================== Coverage summary ===============================
Statements   : 35.19% ( 19/54 )
Branches     : 8.33% ( 1/12 )
Functions    : 0% ( 0/15 )
Lines        : 29.79% ( 14/47 )
================================================================================
/var/workspaces/coldrye/coldrye-es/esbases/esbases/src/error.es:11
export default class EsError
^^^^^^

SyntaxError: Unexpected reserved word
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:414:25)
    at Object.Module._extensions..js [as .es] (module.js:442:10)
    at Object.Module._extensions.(anonymous function) [as .es] (/usr/lib/node_modules/babel-istanbul/lib/hook.js:109:37)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:311:12)
    at Module.require (module.js:366:17)
    at require (module.js:385:17)
    at Object.<anonymous> (/var/workspaces/coldrye/coldrye-es/esbases/esbases/build/test/covercurried-test.js:1:208)
    at Module._compile (module.js:435:26)
    at Object.Module._extensions..js (module.js:442:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:311:12)
    at Module.require (module.js:366:17)
    at require (module.js:385:17)
    at /usr/lib/node_modules/mocha/lib/mocha.js:216:27
    at Array.forEach (native)
    at Mocha.loadFiles (/usr/lib/node_modules/mocha/lib/mocha.js:213:14)
    at Mocha.run (/usr/lib/node_modules/mocha/lib/mocha.js:453:10)
    at Object.<anonymous> (/usr/lib/node_modules/mocha/bin/_mocha:393:18)
    at Module._compile (module.js:435:26)
    at Object.Module._extensions..js (module.js:442:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:311:12)
    at Function.Module.runMain (module.js:467:10)
    at runFn (/usr/lib/node_modules/babel-istanbul/lib/command/common/run-with-cover.js:125:16)
    at /usr/lib/node_modules/babel-istanbul/lib/command/common/run-with-cover.js:258:17
    at /usr/lib/node_modules/babel-istanbul/lib/util/file-matcher.js:68:16
    at /usr/lib/node_modules/babel-istanbul/node_modules/async/lib/async.js:52:16
    at /usr/lib/node_modules/babel-istanbul/node_modules/async/lib/async.js:361:13
    at /usr/lib/node_modules/babel-istanbul/node_modules/async/lib/async.js:52:16
    at done (/usr/lib/node_modules/babel-istanbul/node_modules/async/lib/async.js:246:17)
    at /usr/lib/node_modules/babel-istanbul/node_modules/async/lib/async.js:44:16
    at /usr/lib/node_modules/babel-istanbul/node_modules/async/lib/async.js:358:17
    at LOOP (fs.js:1534:14)
    at doNTCallback0 (node.js:419:9)
    at process._tickCallback (node.js:348:13)

As I am currently trying to migrate my existing projects over to babel 6.x so that might be a problem here?

[silkentrance]

using babel 6.3.x here, while babel-istanbul uses babel 6.1.x

[silkentrance]

nah, I think I found the reason for that. I am creating a dummy test file that will import all existing sources so that the coverage data is correct. After that I removed that file, babel-istanbul will run just fine. Investigating further.

[ghost]

@silkentrance I got the same issue. Can you elaborate how you solved it?

[silkentrance]

@Moezalez it has been some time now so I will try to remember. I think that it finally boiled down to some problem with babel-traverse. Installing a different version than that which the original babel compiler required did solve that problem for me. After a while, i.e. several babel releases later, the problem was gone.

That process included also cleaning out the local node_modules and the globally installed ones so that all dependencies get reinstalled.