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Disallow unsupported Node.js built-in APIs on the specified version (n/no-unsupported-features/node-builtins)

💼 This rule is enabled in the following configs: 🟢 recommended-module, ✅ recommended-script.

Node.js community is improving built-in APIs continuously. You can check Node.js Documentation to know which Node.js version supports each Node.js API.

This rule reports unsupported Node.js built-in APIs on the configured Node.js version as lint errors. Editor integrations of ESLint would be useful to know it in real-time.

This only supports the static apis, eg Buffer.from is supported, but Buffer#includes is not.

📖 Rule Details

This rule reports APIs of Node.js built-in APIs on the basis of Node.js v13.2.0 Documentation.

Configured Node.js version range

Configured Node.js version range

Options

{
    "n/no-unsupported-features/node-builtins": ["error", {
        "version": ">=16.0.0",
        "ignores": []
    }]
}

version

As mentioned above, this rule reads the engines field of package.json. But, you can overwrite the version by version option.

The version option accepts the valid version range of node-semver.

allowExperimental

This allows you to enable experimental features that are available in your configured node version

The "allowExperimental" option accepts a boolean value (the default value is false).

ignores

If you are using transpilers, maybe you want to ignore the warnings about some features. You can use this ignores option to ignore the given features.

The "ignores" option accepts an array of strings.

Tip

You will see the following error messages:

  • The '{{name}}' is not an experimental feature until Node.js {{version}}.
  • The '{{name}}' is still an experimental feature and is not supported until Node.js {{version}}.
  • The '{{name}}' is still an experimental feature

The "name" property is what you can use in your ignores array You can find the full tree view of the list of the modules over in lib/unsupported-features/node-builtins-modules. and globals over in lib/unsupported-features/node-globals.js

Shared Settings

The following options can be set by shared settings. Several rules have the same option, but we can set this option at once.

  • version

For Example:

{
    "settings": {
        "node": {
            "version": ">=16.0.0",
        }
    },
    "rules": {
        "n/no-unsupported-features/node-builtins": ["error", {
            "ignores": []
        }]
    }
}

Known limitations

This rule cannot find non-static things. For example:

  • New properties and methods of instances.
  • New parameters of functions.
  • New options properties of function parameters.
  • New events.

🔎 Implementation