Introduction to es-module-loader
The es-module-loader is a dynamic loader for JavaScript ES modules in browsers and Node.js. It facilitates the loading and management of JavaScript modules, promoting better development practices and code organization.
Key API Explanations with Code Snippets
1. Import Map
One of the essential features is the import map, which allows for the mapping of module specifiers to their corresponding locations.
<script type="importmap">
{
"imports": {
"moduleA": "/js/moduleA.js",
"moduleB": "/js/moduleB.js"
}
}
</script>
2. Dynamic Imports
This API allows for dynamic module loading at runtime.
import('/js/moduleC.js').then((module) => {
module.default();
}).catch((err) => {
console.error('Failed to load module', err);
});
3. Import.meta
This API provides meta-information about the current module.
console.log(import.meta.url);
4. Import Hooks
Hooks can be used to customize module loading behavior.
import { setBaseURL } from 'es-module-loader';
setBaseURL('/base/path/');
import('/module/path.js').then((module) => {
console.log('Module loaded:', module);
});
Example Application Using es-module-loader
Here is a simple example application that makes use of these APIs to load and use different JavaScript modules dynamically.
<!DOCTYPE html>
<html>
<head>
<title>es-module-loader Example App</title>
</head>
<body>
<script type="importmap">
{
"imports": {
"utils": "/js/utils.js",
"mainModule": "/js/mainModule.js"
}
}
</script>
<script type="module">
import { initialize } from 'mainModule';
initialize();
</script>
</body>
</html>
In this example, utils and mainModule are imported using the import map. The initialize function from mainModule is called to start the application.
Hash: 260a87289eb46ec4c8f4ea9b03549a66ba31362f5e6df647412376cabcf843f6
