ES6 String Templates Throw Errors

[Tivoli]

String templates even when the --harmony flag is set for mocha throws a token ILLEGAL error;

Simple before to replicate.

before(function() {
  let a = 1;
  console.log(`${a}`);
});

  console.log(`${a}`);
              ^
SyntaxError: Unexpected token ILLEGAL
    at exports.runInThisContext (vm.js:73:16)
    at Module._compile (module.js:443:25)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at <redacted>/node_modules/mocha/lib/mocha.js:185:27
    at Array.forEach (native)
    at Mocha.loadFiles (/Users/Tivs/Documents/github/nurfed/curio-node/node_modules/mocha/lib/mocha.js:182:14)
    at Mocha.run (<redacted>/node_modules/mocha/lib/mocha.js:394:31)
    at Object.<anonymous> (<redacted>/node_modules/mocha/bin/_mocha:394:16)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:124:16)
    at node.js:842:3

[boneskull]

@dasilvacontin What feedback do we need?

[boneskull]

Actually I know what we need.

@Tivoli Need to know exactly how you are executing Mocha, if you have a mocha.opts, etc.

[Tivoli]

I do not have have a mocha.opts file, I'm executing it from the following Makefile.

default: test
NODE_ENV = test
REPORTER = dot
CFLAGS = -c -g -D $(NODE_ENV)

# Find all test files
SPECS = $(shell find ./test/specs -type f -name "*.js")
ACCEPTANCE = $(shell find ./test/acceptance -type f -name "*.js")

test:
    @NODE_ENV=$(NODE_ENV) ./node_modules/.bin/mocha \
        --harmony \
        --reporter $(REPORTER) \
        --require co-mocha \
        --timeout 10s \
        --bail \
        test/spec_helper.js \
        $(SPECS) \
        $(ACCEPTANCE)

.PHONY: test

I removed the co-mocha require with the same result.

[domenic]

This is probably because the version of node you are using does not support template strings (even with --harmony). io.js is the only release that supports template strings right now.

[Tivoli]

@domenic I am using io.js, my app runs fine and is using template strings. The node executable is also symlinked to io.js.

[domenic]

Ah OK hmm nevermind then I am totally wrong! I still have a hard time understanding what could cause this in that case but who knows.

[boneskull]

@domenic Ahh, this gives me something to go on.

@Tivoli Please try running iojs --harmony /path/to/_mocha <args>

[Tivoli]

@boneskull That works.

[dasilvacontin]

#!/usr/bin/env node at mocha bin (?)

[boneskull]

@dasilvacontin What are you asking?

[boneskull]

@Tivoli So iojs is not symlinked to node on your system? I don't think we can support that setup--at least not yet.

[Tivoli]

@boneskull It is symlinked. node --harmony /path/to/_mocha <args> works fine as well.

[boneskull]

@Tivoli If you clone master (then npm install && npm link I suppose), executing mocha like normal should work correctly. At least it has in my limited testing against iojs.

[aMarCruz]

On Windows, change this line:

@NODE_ENV=$(NODE_ENV) ./node_modules/.bin/mocha \

to

@NODE_ENV=$(NODE_ENV) ./node_modules/mocha/bin/mocha \