Problem Statement
Mark a package as ESM by…
Explanation
In Node, ESM is enabled by setting "type": "module" in package.json for .js files, or by using the .mjs extension. Both approaches tell Node to treat your files as ES modules.
Code Solution
SolutionRead Only
// package.json
{ "type": "module" }
// or name files: app.mjs
// then use: import x from './x.js'