How to Implement Code Splitting in Vanilla JS
How to dynamically load JavaScript modules on demand using modern native ES import syntaxes.
Structure Independent Script Modules
Separate application logic into distinct, isolated JavaScript files (e.g., 'heavyChart.js', 'analytics.js') using standard ES module syntax.
Identify the Interaction Triggers
Locate specific interactive user elements, like a button click or an expansion drawer tab, that require the heavy code module to run.
Call the Dynamic Import Syntax
Inside the interaction trigger event listener, invoke the dynamic module import syntax: 'import("./modules/heavyChart.js")'.
Resolve Module Promise Results
Handle the returned dynamic import Promise using async/await syntax to capture the exported methods from the target module file.
Extract Named or Default Exports
Destructure your needed functions directly out of the resolved module module response object payload.
Execute the Dynamic Module Logic
Invoke the newly imported function, passing any required UI component parameters or element contexts to render components onto the screen.
Catch Network Resolution Errors
Wrap the dynamic import statement inside a try/catch block to catch network download failures or offline connection dropped events gracefully.
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