"presets": [ "power-assert" ]
, "plugins": [ "istanbul" ]
So, I can't narrow it down to a simple test-case; but at the moment, using the power-assert preset (for testing output) alongside the istanbul plugin (for coverage generation) produces obscure syntax errors inside babel:
/home/travis/build/ELLIOTTCABLE/giraphe/node_modules/babel-core/lib/transformation/file/index.js:590
throw err;
^
SyntaxError: /home/travis/build/ELLIOTTCABLE/giraphe/giraphe.js: Invalid left-hand side in prefix operation (3097:69)
3095 | KEY = (++cov_1mlpy989m8.s[53], null != opts.keyer ? (++cov_1mlpy989m8.b[19][0], opts.keyer.call(current, current)) : (++cov_1mlpy989m8.b[19][1], current[opts.key]));
3096 | ++cov_1mlpy989m8.s[54];
> 3097 | (0, _powerAssert2.default)(_rec5._expr(_rec5._capt((_rec5._capt(++_rec5._capt(_rec5._capt(_rec5._capt(_rec5._capt(cov_1mlpy989m8, 'arguments/0/left/expressions/0/argument/object/object/object').b, 'arguments/0/left/expressions/0/argument/object/object')[20], 'arguments/0/left/expressions/0/argument/object')[0], 'arguments/0/left/expressions/0/argument'), 'arguments/0/left/expressions/0'), _rec5._capt(_rec5._capt(typeof KEY === 'undefined' ? 'undefined' : (0, _typeof3.default)(KEY), 'arguments/0/left/expressions/1/left') === 'string', 'arguments/0/left/expressions/1')) && (_rec5._capt(++_rec5._capt(_rec5._capt(_rec5._capt(_rec5._capt(cov_1mlpy989m8, 'arguments/0/right/expressions/0/argument/object/object/object').b, 'arguments/0/right/expressions/0/argument/object/object')[20], 'arguments/0/right/expressions/0/argument/object')[1], 'arguments/0/right/expressions/0/argument'), 'arguments/0/right/expressions/0'), _rec5._capt(_rec5._capt(KEY, 'arguments/0/right/expressions/1/left') !== '', 'arguments/0/right/expressions/1')), 'arguments/0'), {
| ^
3098 | content: 'assert((++cov_1mlpy989m8.b[20][0], typeof KEY === \'string\') && (++cov_1mlpy989m8.b[20][1], KEY !== \'\'))',
3099 | filepath: './giraphe.es6.js',
3100 | line: 102
at Parser.pp$5.raise (/home/travis/build/ELLIOTTCABLE/giraphe/node_modules/babylon/lib/index.js:4454:13)
at Parser.pp$2.checkLVal (/home/travis/build/ELLIOTTCABLE/giraphe/node_modules/babylon/lib/index.js:3233:14)
at Parser.checkLVal (/home/travis/build/ELLIOTTCABLE/giraphe/node_modules/babylon/lib/index.js:6086:22)
at Parser.pp$3.parseMaybeUnary (/home/travis/build/ELLIOTTCABLE/giraphe/node_modules/babylon/lib/index.js:3464:12)
(More: https://travis-ci.org/ELLIOTTCABLE/giraphe/jobs/245592548#L224-L372)
This is fixed by removing babel-preset-power-assert and replacing it with the individual plugins themselves, and then loading all three of them as babel plugins, instead of presets.
"plugins": [ "espower", "empower-assert", "istanbul" ]
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