javascript Cannot use import statement outside a module when importing function from other file code example

Example 1: cannot use import statement outside a module typescript

// Fix 1
Change .js files to .cjs
// Fix 2
Add "type": "module" to package.json

Example 2: SyntaxError: Cannot use import statement outside a module

Node.js >= v13

Save the file with .mjs extension, &
Add { "type": "module" } in the nearest package.json.
(run npm init to create package.json)