ESLint couldn't find the plugin …

Symptoms

When using the legacy ESLint config system, you may see this error running ESLint after installing dependencies:

ESLint couldn't find the plugin "${pluginName}".

(The package "${pluginName}" was not found when loaded as a Node module from the directory "${resolvePluginsRelativeTo}".)

It's likely that the plugin isn't installed correctly. Try reinstalling by running the following:

    npm install ${pluginName}@latest --save-dev

The plugin "${pluginName}" was referenced from the config file in "${importerName}".
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Cause

Legacy ESLint configuration files specify shareable configs by their package name. That package name is passed to the Node.js require(), which looks up the package under local node_modules/ directories. For example, the following ESLint config will first try to load a module located at node_modules/eslint-plugin-yours:

module.exports = {
    extends: ["plugin:eslint-plugin-yours/config-name"],
};
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If the package is not found in any searched node_modules/, ESLint will print the aforementioned error.

Common reasons for this occurring include:

Not running npm install or the equivalent package manager command
Mistyping the case-sensitive name of the plugin

Plugin Name Variations

Note that the eslint-plugin- plugin name prefix may be omitted for brevity, e.g. extends: ["yours"].

@ npm scoped packages put the eslint-plugin- prefix after the org scope, e.g. extends: ["@org/yours"] to load from @org/eslint-plugin-yours.

Resolution

Common resolutions for this issue include:

Upgrading all versions of all packages to their latest version.
Adding the plugin as a devDependency in your package.json.
Running npm install or the equivalent package manager command.
Checking that the name in your config file matches the name of the plugin package.

Resources

For more information, see:

Legacy ESLint configuration files for documentation on the legacy ESLint configuration format
Configure Plugins for documentation on how to extend from plugins
Create Plugins for documentation on how to define plugins

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