export default causes CommonJS bundles to include .default

[dave9123]

Adding export default to the main code causes CommonJS bundles to include .default and returns an error if not:

C:\Users\davet\Documents\sudokutest\index.js:15
console.log("Empty: ", sudoku.findAllEmpty(grid));
                              ^

TypeError: sudoku.findAllEmpty is not a function
    at Object.<anonymous> (C:\Users\davet\Documents\sudokutest\index.js:15:31)
    at Module._compile (node:internal/modules/cjs/loader:1565:14)
    at Object..js (node:internal/modules/cjs/loader:1708:10)
    at Module.load (node:internal/modules/cjs/loader:1318:32)
    at Function._load (node:internal/modules/cjs/loader:1128:12)
    at TracingChannel.traceSync (node:diagnostics_channel:322:14)
    at wrapModuleLoad (node:internal/modules/cjs/loader:219:24)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:170:5)
    at node:internal/main/run_main_module:36:49

Node.js v22.12.0

With .default

Without .default