Unexpected Webpack2 `use` merge

Given the following merge:

merge.smart({
  rules: [{
    test: /\.js$/,
    use: 'babel'
  }]
}, {
  rules: [{
    test: /\.js$/,
    use: 'coffee'
  }]
});

I would expect the following according to the what the Webpack1 examples seem to suggest in the README:

{
  rules: [{
    test: /\.js$/,
    use: 'coffee'
  }]
}

Instead I get:

{
  rules: [{
    test: /\.js$/,
    use: ['babel','coffee']
  }]
}

There doesn’t seem to be a way to overwrite a string value in use as it always gets converted to an array and merged.

[bebraw]

I made a little fix. I think you should be able to use

const output = merge.smartStrategy(
  {
    'module.rules.use': 'replace'
  })(common, prod);

now to achieve the behavior you described.

Let’s leave this issue open for now, though, as this needs careful thought. It would be tempting to drop smart merging in 3.0 as it’s strategies that are valuable, not folding.

[bebraw]

@bmayen Ok, I’ll check that tomorrow. There’s something else biting. use is definitely complex to handle.