Question

"Cannot use import statement outside a module javascript" is an error that is often encountered by JavaScript developers when they try to use the import statement in their JavaScript file. The cause of this error is that the JavaScript file being used does not follow the ECMAScript 6 (ES6)specification and is not running in an environment that supports ES6

Table of Contents:

1. What is ES6?
2. Solve Error
3. Example
   1. Create file math.js
   2. Create file main.js
   3. If you use package.json, add “type”: “module”
   4. Output
4. The Conclusion

"Cannot use import statement outside a module javascript"#

ES6 is a modern version of JavaScript that has been around for a few years. It makes our code easier to read and write. With ES6, we can do more with less code, which is why the saying "write less, do more" fits well with it.

ES6 uses Import/Export statements to bring in and send out modules from one file to another. However, not all browsers or environments fully support ES6, meaning if your JavaScript code uses import statements, you will get the error "Cannot use import statement outside a module" in the browser. or environments that do not support ES6.

We will encounter an error when we execute the code above. To understand this error, let us take one more example and see how we can fix this error. We are taking the same example as above and we will try to fix it.

Solve Error #

To overcome this error, developers have two options available to them. The first option is to use a transpiler such as Babel. Babel is a powerful tool that can convert ES6 code into ES5 code, which is supported by all browsers. This allows developers to write code using ES6 features and then convert it into ES5 before running the JavaScript file.

The second option is to use an environment that supports ES6 such as Node.js or a more recent browser that already supports ES6. This will ensure that the "Cannot use import statement outside a module javascript" error is not encountered as the environment will already support the import statement.

More Example #

Crate file math.js

First, we will create a math.js file, where we will write simple calculation functions. These functions will later be utilized when we try to use the 'Import'feature.

        
               // math.js
                export function add(a, b) {
                return a + b;
                }
            
        
    

Crate file main.js

Next, we will create a main.js file and to access the previously created math.js file, we can use the import statement import add from "./math.js". Here is the complete code.

        
            
               // main.js
               import { add } from "./math.js";
               console.log(add(1, 2));
            
        
    

Note Using the Babel transpiler to convert ES6 to ES5, which is supported by all browsers

If you use package.json

In this scenario, we use the package.json file to manage our module types, allowing us to use ES6 syntax in the future.

            
               {
                "name": "kodlogs",
                "version": "1.0.0",
                "description": "",
               "type": "module",
                "main": "main.js",
                "scripts": {
                  "test": "echo \"Error: no test specified\" && exit 1"
                },
                "keywords": [],
                "author": "",
                "license": "ISC"
              }
            
        
    

Output

Then the resulting output will look like this.

            
               // console
               3
            
        
    

The Conclusion

"Cannot use import statement outside a module javascript" error can easily be resolved by either using a transpiler or an environment that supports ES6. This will enable developers to write modern JavaScript code and take advantage of all the new features that ES6 has to offer. The time it takes to read this information will vary based on individual reading speed, but it is estimated to take approximately 5 minutes or more to fully understand and absorb the information presented.