No packages duplicates

Ensures that bundle hasn't package duplicates.

Fails validation if some packages have more than one instance (directory with a package within node_modules).

Example

Assume that we have two instances for the foo-package:

• node_modules/foo
• node_modules/bar/node_modules/foo

Rule:

{
  "@statoscope/webpack/no-packages-dups": ["error"]
}

Output:

- ❌ Package foo has 2 instances

Options

type Options = {
  exclude?: Array<
    string |
    RegExp |
    {
      type: 'compilation' | 'package';
      name: string;
    }
  >
}

exclude

Specify packages or compilations that must be ignored by the rule.

Exclude by package name:

{
  "@statoscope/webpack/no-packages-dups": [
    "error",
    {
      "exclude": ["foo"] // or regexp
    }
  ]
}

There are no errors, even if foo package has more than one instances

Exclude by compilation name:

{
  "@statoscope/webpack/no-packages-dups": [
    "error",
    {
      "exclude": [
        {
          "type": "compilation",
          "name": "foo-compilation" // or regexp
        }
      ]
    }
  ]
}

There are no errors, even if foo-compilation has packages with more than one instances

Consider not to use exclude-option to make your bundle less excess