Example check existence of a module in Node.js

require.js

/**
 * What pass when require a module?
 *
 * Steps
 *
 * 1. Resolving
 * 2. Loading
 * 3. Wrapping
 * 4. Evaluating
 * 5. Caching
 */

// Example check existence of a module

try {
  require.resolve("fake_module");
} catch (err) {
  if (err.code === "MODULE_NOT_FOUND") {
    console.log("The current module not exists");
  }
}