. is not replaced in filenames

[rianbotha]

• Operating System: MacOS
• Node Version: 10.15.3
• NPM Version: 6.4.1
• webpack Version: 4.39.1
• css-loader Version: 3.1.0

Expected Behavior

In 2.1.0 using this pattern for localIdentName: [name]_[local]_[hash:base64:5] the name portion would be transformed from file.module to file-module. File name is file.module.scss.

Actual Behavior

The . in file.module is no longer changed to a -.

We use babel-plugin-react-css-modules alongside css-loader. The babel plugin still transforms filenames in the same way the CSS Loader 2.* did.

Code

// CSS Loader portion of webpack config
{
  loader: 'css-loader',
  options: {
    modules: {
      localIdentName: '[name]_[local]_[hash:base64:5]',
    },
    importLoaders: 2,
    sourceMap: !production,
  },
},

How Do We Reproduce?

Use a SCSS filename with one or more . in the filename.

[alexander-akait]

It is expected and breaking change for css-loader@3, babel-plugin-react-css-modules should change logic generation too

[alexander-akait]

@rianbotha anyway can you create minimum reproducible test repo?

[alexander-akait]

/cc @jquense what do you think, maybe it is not conventional for developers

[jquense]

The file.module.css or whatever css flavor (scss, less, etc) is fairly conventional at this point but I don't know that default replacing the dot is a convention...I do think that replacing invalid case characters like this is better than escaping them like we do now but that's just my preference. For my webpavk builds I do change the default getLocalIdent to replace dots with dashes

[alexander-akait]

@jquense just for information, can you provide getLocalIdent source code, will be great see one of use case, maybe we can improve standard generation for better DX

[jquense]

It's pretty simple I don't escape other path characters tho since we don't use the path interpolation https://github.com/jquense/webpack-atoms/blob/master/src/index.ts#L150

[alexander-akait]

Ok, let's fix it, as regression from 2.0.0

[rianbotha]

@evilebottnawi Do you still need a repo?
To get around it in the meantime I just added a custom getLocalIdent copied from the original, that just replaces . with -. A bit blunt, but solves the immediate issue for us:

const getLocalIdent = (loaderContext, localIdentName, localName, options) => {
  const filenameReservedRegex = /[<>:"/\\|?*\x00-\x1F]/g;
  const reControlChars = /[\u0000-\u001f\u0080-\u009f]/g;
  const reRelativePath = /^\.+/;

  if (!options.context) {
    options.context = loaderContext.rootContext;
  }

  const request = normalizePath(
    path.relative(options.context || '', loaderContext.resourcePath)
  );

  options.content = `${options.hashPrefix + request}+${unescape(localName)}`;

  return cssesc(
    loaderUtils
      .interpolateName(loaderContext, localIdentName, options)
      // For `[hash]` placeholder
      .replace(/^((-?[0-9])|--)/, '_$1')
      .replace(filenameReservedRegex, '-')
      .replace(reControlChars, '-')
      .replace(reRelativePath, '-')
      .replace(/\./g, '-'),
      { isIdentifier: true }
  ).replace(/\\\[local\\\]/gi, localName);
};

Might be better to add it to filenameReservedRegex?

[alexander-akait]

@rianbotha no need new option, it is bug and need fix, PR welcome