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webpack image sizes plugin #463

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n-langle
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@n-langle n-langle commented Jun 4, 2025

Prevent webpack image sizes plugin to be called too many times

Summary by Sourcery

Optimize the WebpackImageSizesPlugin to avoid repeated invocations by tracking build state and file changes, streamline its initialization logic, and correct the SCSS import path for Poppins font mixins.

Enhancements:

  • Throttle image sizes generation by tracking build state and skipping runs when no config images change
  • Leverage compilation.modifiedFiles in watch mode to detect changes and conditionally invoke the plugin
  • Refactor option initialization to apply static defaults before merging custom settings
  • Remove redundant path resolutions by extracting compiler context once in the apply hook
  • Introduce a static hasBeenBuiltOnce flag to track first build and prevent unnecessary re-generation
  • Update watchRun hook signature to use compilation context for change detection

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sourcery-ai bot commented Jun 4, 2025

Reviewer's Guide

This PR refactors the WebpackImageSizesPlugin to streamline default option handling, optimize its execution by skipping redundant runs through build and config-change detection, refactors hook implementations for correct context and parameter usage, and updates the SCSS font mixin import path.

Sequence Diagram for WebpackImageSizesPlugin Conditional Execution

sequenceDiagram
  participant C as WebpackCompiler
  participant P as WebpackImageSizesPlugin

  C->>P: Hook triggered (emit or watchRun) with Compilation
  activate P
  P->>P: runGeneration(compilation, callback)
  alt Initial build OR confImgPath changed in compilation.modifiedFiles
    P->>P: Set hasBeenBuiltOnce = true
    P->>P: Log "Starting WebpackImageSizesPlugin generation..."
    P-->>P: Perform image processing tasks
    P->>C: callback()
  else Not initial build AND no changes in confImgPath
    P->>P: Log "No changes detected in confImgPath"
    P-->>P: Skip image generation
    P->>C: callback()
  end
  deactivate P
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Updated Class Diagram for WebpackImageSizesPlugin

classDiagram
  class WebpackImageSizesPlugin {
    +boolean hasBeenBuiltOnce$
    +constructor(options: Object)
    +apply(compiler: WebpackCompiler)
    +generateDefaultImages(context: string, imageSizes: Object)
  }
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State Diagram for WebpackImageSizesPlugin Build Status

stateDiagram-v2
    [*] --> NotBuiltYet : Initial State
    NotBuiltYet: Plugin has not run successfully yet.
    BuiltOnce: Plugin has run successfully at least once.

    NotBuiltYet --> BuiltOnce : First successful runGeneration completes
    BuiltOnce --> BuiltOnce : Subsequent runGeneration (executes or skips based on changes)
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File-Level Changes

Change Details Files
Simplify default option assignment
  • Define literal defaults before merging with options using spread
  • Remove inline fallback logic in constructor
config/webpack-image-sizes-plugin.js
Optimize plugin execution and hook logic
  • Add static hasBeenBuiltOnce flag and detect modifiedFiles to skip runs
  • Extract compiler.context at top and remove duplicate path resolutions
  • Update watchRun hook to pass compilation, adjust generateDefaultImages call
config/webpack-image-sizes-plugin.js
Fix SCSS font mixins import path
  • Change @use path to reference node_modules via relative path
src/scss/03-base/_fonts.scss

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Hey @n-langle - I've reviewed your changes and they look great!

Here's what I looked at during the review
  • 🟡 General issues: 3 issues found
  • 🟢 Security: all looks good
  • 🟢 Testing: all looks good
  • 🟢 Documentation: all looks good

Sourcery is free for open source - if you like our reviews please consider sharing them ✨
Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.

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