@perfective/eslint-config/linter/plugin.js

ESLint shareable rules configuration

import { hasNodeModule } from "./node.js";
export function optionalRule(rule, config) {
  const plugin = pluginOfRule(rule);
  if (plugin === null) {
    return {};
  }
  if (hasEslintPlugin(plugin)) {
    return {
      [rule]: config
    };
  }
  return {};
}
export function hasEslintPlugin(plugin) {
  if (plugin.startsWith('@')) {
    return hasNodeModule(`${plugin}/eslint-plugin`);
  }
  return hasNodeModule(`eslint-plugin-${plugin}`);
}
function pluginOfRule(rule) {
  const parts = rule.split('/');
  if (parts.length > 1) {
    return parts[0];
  }
  return null;
}