Why Do I Get 'Uncaught SyntaxError: Cannot use import statement outside a module' When Importing ECMAScript 6 Modules?

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

Overview

When trying to import the ECMAScript 6 module milsymbol.js into an ArcGIS JSAPI project, you may encounter the error "Uncaught SyntaxError: Cannot use import statement outside a module." This guide provides a solution to this error.

Problem

The error occurs because the milsymbol.js script requires a module environment to use the import statement. Without a module environment, the browser will not recognize the syntax.

Solution

To enable a module environment in the ArcGIS JSAPI project, you can modify the script tag that includes milsymbol.js by adding the type="module" attribute:

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

This will create a module environment for the milsymbol.js script, allowing it to use the import statement.

Alternative for Node.js/NPM

If you are working with Node.js/NPM, you can also configure the package.json file to use the module syntax:

{
  // ...
  "type": "module",
  // ...
}

This will enable the module syntax throughout your project.

Usage

Once the module environment is configured, you can use the import syntax to reference the ms object from milsymbol.js:

import { ms } from "milsymbol-2.0.0/src/milsymbol.js";

Note that you will need to use the import syntax instead of the require syntax when working with modules.

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