Why Am I Getting 'Uncaught SyntaxError: Cannot use import statement outside a module' When Importing ES6 Modules?

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

When attempting to import an ECMAScript 6 module into ArcGIS JSAPI 4.12, you may encounter the error "Uncaught SyntaxError: Cannot use import statement outside a module."

To resolve this issue, for Node.js / NPM, update your package.json file by adding the property "type": "module".

For web browsers, this error can occur if the script is not marked as a module. Ensure that the script tag includes the "type" attribute set to "module."

Example:

<script type="module" src="milsymbol-2.0.0/src/milsymbol.js">
</script>

If you still encounter errors, consider using a bundler to package your project's dependencies.

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