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JavaScript

Advancednote 04 of 0803 reasons · 03 notes

JavaScriptAdvanced

Keep modules side-effect light

Make imports predictable by moving startup work into explicit functions.

Code example

Copy, adapt, and ship.

Read the numbered lines, copy the complete snippet, then adjust the values for your project.

analytics.js
// analytics.jsexport function initAnalytics() {  window.analytics?.load();} // app.jsimport { initAnalytics } from "./analytics"; initAnalytics();
Production-ready starting point9 lines · copy with one click

Why this matters

The production reason.

  1. 01

    Imports should be boring. If importing a module starts timers, reads the DOM, or sends analytics, it becomes harder to test and split.

  2. 02

    Keep modules focused on exported values and functions. Run startup work explicitly from the place that owns it.

  3. 03

    This makes bundling, lazy loading, and server/client boundaries easier to reason about.

Platform notes03

How it holds up outside a demo.

  • JavaScriptAvoid top-level DOM reads in shared modules.
  • Next.jsKeep browser-only startup code inside client components or effects.
  • TestingSide-effect-light modules are easier to import in unit tests.

Explore other stacks

Jump into a different technology.

08 JavaScript notes on this shelf, and six more stacks beside it.

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Fix WordPress H1 SEO issues

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Reduce LCP with image optimization

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HTML

Use real buttons for actions

If it changes state, use button. If it navigates, use a link.

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