![]() ![]() However, dynamic import support is somewhat limited right now (IE will never support it, Edge is only going to get it when they finish the switch to Chromium under the hood, and UC Browser, Opera Mini, and a handful of others still don't have it either), so you can't really use them if you want to be truly portable (especially since static imports (the original ES6 import syntax) are only valid at the top level, so you can't conditionally use them if you don't happen to have dynamic import support).Īs a result of this, code built around ES6 modules is often slower than equivalent code built on AMD (or a good UMD syntax). In essence, you use import as a function in the global scope, which then returns a Promise that resolves to the module you're importing once it's fetched and parsed. ![]() Now, there is a way to make them asynchronous called 'dynamic import'. They do, however, cache the results of this execution and do direct binding, so the above line called from separate files will produce multiple references to the single 'bar' and 'baz' entities. import from './foo.js' loads, parses, and runs all of './foo.js', then binds the exported entities named 'bar', and 'baz' to those names in the local scope, and only then does the next import statement get evaluated. They also don't do selective execution of module code like you seem to imply. ![]() Put simply, unless you're using dynamic imports (see below), each import statement runs to completion before the next statement starts executing, and the process of fetching (and parsing) the module is part of that. ES6 modules aren't asynchronous, at least not as they are in use right now most places. ![]()
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