Webpack loader equivalent of requirejs plugin load with XMLHttpRequest
I have a pair of requirejs plugins, that I'd like to replace with a webpack loader.
define('firstLoader', {
load: function (name, parentRequire, onload, config) {
var xhr = new XMLHttpRequest();
xhr.addEventListener('load', function () {onload(this.responseText);});
xhr.addEventListener('error', onload.error);
xhr.addEventListener('abort', onload.error);
var url = '...' + name;
xhr.open('GET', url);
xhr.send()
}
})
define('jsonLoader', {
load: function (name, parentRequire, onload, config) {
//This is the nasty part.
req(['firstLoader!' + name], function (text) {
try {
onload(JSON.parse(text));
}
catch (err) {
onload.error(err);
}
})
}
});
The biggest problems are the lack of promises for the async request and the dynamic require. Is there a way around this without transpilation (with `System.load) or additional libraries (bluebird, etc.)?
Edit
So I've taken a crack at this, and now I'm getting an error
Module not found: Error: Can't resolve 'future/url'
when I go to require('jsonLoader!future/url' ). Does webpack allow loaders to operate at runtime? Here's the updated code.
firstPlugin.js
module.exports = function loadAsync (content, callback) {
var host = document.location.host
var url = host + '...' + name
xhr.addEventListener("load", function () {callback(null, this.responseText)})
xhr.open("GET", url)
xhr.send()
}
}
jsonPlugin.js
module.exports = function (content, callback) {
require('firstPlugin!' + content, function (result) {
callback(null, JSON.parse(result))
})
}
Require and Webpack are just fundamentally different patterns. They both relate to 'modules' and 'loading', but otherwise...
In general, Webpack is purely a compile/build-time tool. So, no, its loaders can't operate at runtime. However, Webpack can create multiple bundles at build-time, which you can call/download separately at runtime. Depending on how you want to call those additional bundles (from inside a module, or from a particular 'page') the Webpack concepts you're interested in are Code Splitting and Entry Points.
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