Why am I getting 'Uncaught SyntaxError: Cannot use import statement outside a module' when importing ES6 modules in ArcGIS JSAPI?

"Uncaught SyntaxError: Cannot use import statement outside a module" when importing ECMAScript 6

When attempting to use Spatial Illusions to draw military symbols on a map using ArcGIS JSAPI 4.12, one may encounter the error "Uncaught SyntaxError: Cannot use import statement outside a module" upon importing milsymbol.js. The root of this issue lies in the fact that ECMAScript 6 (ES6) modules, which use the import keyword, require the

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