Truffle: No way to provide mocha command-line options

[raineorshine]

• [x] I've asked for help in the Truffle Gitter before filing this issue.

---

Issue

The way that truffle runs mocha disallows babel-core/register and babel-polyfill (needed for async/await, e.g.). This functionality cannot be achieved with mocha's programmatic options.

truffle test used to provide -- as a way to pass arguments to mocha, iirc. That appears to not be possible any more.

Steps to Reproduce

truffle test -- --compilers js:babel-core/register

I am using a babel config of:

{
  "presets": [
    "es2015"
  ],
  "plugins": [
    "transform-async-to-generator"
  ]
}

Expected Behavior

Tests should run with babel's runtime transformations.

Actual Results

Using network 'development'.

  0 passing (1ms)

Possible Solution

Presumably being able to pass command line arguments through to mocha would fix the issue, so that truffle test would behave like mocha --compilers js:babel-core/register.

Alternatively, adding these two lines of code to truffle's ./cli.js solves the problem:

require('babel-core/register')
require('babel-polyfill')

Obviously not every user wants this, so it would have to be conditional. What would be the best way to re-enable this functionality? Thanks!

Environment

• Operating System: OSX
• Truffle version: 3.1.1
• Ethereum client: N/A
• node version: 7.0.4
• npm version: 4.0.5

[tcoulter]

Have your tried adding the babel-register require in your truffle.js
file? Truffle relied on babel previously but it caused more harm than good.
I'd prefer not making babel a dependency of Truffle.

On Feb 5, 2017 12:52 PM, "Raine Revere" [e-mail] wrote:

>

• I've asked for help in the Truffle Gitter
  http://gitter.im/Consensys/truffle before filing this issue.

---

Issue

The way that truffle runs mocha disallows babel-core/register and
babel-polyfill (needed for async/await, e.g.). This functionality cannot
be achieved with mocha's programmatic options
https://github.com/mochajs/mocha/issues/1220.

truffle test used to provide -- as a way to pass arguments to mocha,
iirc. That appears to not be possible any more.
Steps to Reproduce

truffle test -- --compilers js:babel-core/register

I am using a babel config of:

{
"presets": [
"es2015"
],
"plugins": [
"transform-async-to-generator"
]
}

Expected Behavior

Tests should run with babel's runtime transformations.
Actual Results

Using network 'development'.

0 passing (1ms)

Possible Solution

Presumably being able to pass command line arguments through to mocha
would fix the issue, so that truffle test would behave like mocha
--compilers js:babel-core/register.

Alternatively, adding these two lines of code to truffle's ./cli.js
solves the problem:

require('babel-core/register')require('babel-polyfill')

Obviously not every user wants this, so it would have to be conditional.
What would be the best way to re-enable this functionality? Thanks!
Environment

• Operating System: OSX
• Truffle version: 3.1.1
• Ethereum client: N/A
• node version: 7.0.4
• npm version: 4.0.5

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[tcoulter]

Also, Truffle doesn't call mocha via the command line. Instead, it does it
programmatically. You can alter the mocha configuration via the mocha key
in your Truffle configuration file.
http://truffleframework.com/docs/advanced/configuration#mocha

On Feb 5, 2017 1:22 PM, "Tim Coulter" [e-mail] wrote:

Have your tried adding the babel-register require in your truffle.js
file? Truffle relied on babel previously but it caused more harm than good.
I'd prefer not making babel a dependency of Truffle.

On Feb 5, 2017 12:52 PM, "Raine Revere" [e-mail] wrote:

>

• I've asked for help in the Truffle Gitter
  http://gitter.im/Consensys/truffle before filing this issue.

---

Issue

The way that truffle runs mocha disallows babel-core/register and
babel-polyfill (needed for async/await, e.g.). This functionality cannot
be achieved with mocha's programmatic options
https://github.com/mochajs/mocha/issues/1220.

truffle test used to provide -- as a way to pass arguments to mocha,
iirc. That appears to not be possible any more.
Steps to Reproduce

truffle test -- --compilers js:babel-core/register

I am using a babel config of:

{
"presets": [
"es2015"
],
"plugins": [
"transform-async-to-generator"
]
}

Expected Behavior

Tests should run with babel's runtime transformations.
Actual Results

Using network 'development'.

0 passing (1ms)

Possible Solution

Presumably being able to pass command line arguments through to mocha
would fix the issue, so that truffle test would behave like mocha
--compilers js:babel-core/register.

Alternatively, adding these two lines of code to truffle's ./cli.js
solves the problem:

require('babel-core/register')require('babel-polyfill')

Obviously not every user wants this, so it would have to be conditional.
What would be the best way to re-enable this functionality? Thanks!
Environment

• Operating System: OSX
• Truffle version: 3.1.1
• Ethereum client: N/A
• node version: 7.0.4
• npm version: 4.0.5

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You are receiving this because you are subscribed to this thread.
Reply to this email directly, view it on GitHub
https://github.com/ConsenSys/truffle/issues/346, or mute the thread
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.

[raineorshine]

It works! 😃

[tcoulter]

Yay! I need to write docs for this use case...

On Feb 5, 2017 1:40 PM, "Raine Revere" [e-mail] wrote:

Closed #346 https://github.com/ConsenSys/truffle/issues/346.

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[tomerweisman]

@raineorshine
Hi. can you please provide the truffle.js, or any configuration files that worked for you?

[cgewecke]

@tomerweisman Here's an example that tells mocha to consume a third-party reporter. Equivalent to:

mocha --reporter <reporter-name> --reporter-options <options>

module.exports = {
  networks: {
    ...etc...
  },
  mocha: {
    reporter: 'super-test',
    reporterOptions : {
      extraEmojis: false,
    }
  }
};

[tomerweisman]

@cgewecke this for the example. my problem is that I cant get truffle (mocha) to recognize ES6 "import" syntax.
Ive added the following dependencies in package.json:
"devDependencies": { "babel-polyfill": "^6.26.0", "babel-preset-es2015": "^6.24.1", "babel-preset-stage-2": "^6.24.1", "babel-preset-stage-3": "^6.24.1", "babel-register": "^6.26.0", "solidity-coverage": "^0.5.0" }

and have this .babelrc file:
{ "presets": ["es2015", "stage-2", "stage-3"] }

and truffle-config.js file:
require('babel-register')({ ignore: /node_modules\/(?!zeppelin-solidity)/ }); require('babel-polyfill');

Truffle v4.1.8 (core: 4.1.8)
Solidity v0.4.23 (solc-js)

I wanted @raineorshine to share the config files that worked for her
Any idea how to solve?

thanks

[mtomov]

Hey @tomerweisman - thanks so much - your truffle-config.js example totally allowed me to do the same thing you're after!

I have the same .babelrc and package.json files, but placed the require('babel.. in truffle.js instead.

Try changing zeppelin-solidity to openzeppelin-solidity as well.

Thanks again!