Index Variation Resolve Plugin

Enables an @index alias for ES6 imports (both static and dynamic/asynchronous) which resolves to the name of a folder passed to it that contains index-specific variations within a ff0000-ad-tech ad build.

Overview

For example, say we have two index files, index.html and index-diff.html. However, in index-diff.html, we want to import pretty much all of the assets used with index.html except for a few images specific to index-diff.html. So when importing images in the unit's build scripts, we can use the @index to allow using the standard assets for both indexes but also allow index-diff to override certain imports. With the given folder structure:

1-build (directory)
  > 300x250 (directory)
    > Ad.js 
    > images (directory)
      > bg.jpg
      > index-diff (directory)
        > bg.jpg

From Ad.js, if we wanted to import bg.jpg while allowing an override for index-diff, we can use:

// Ad.js

import './images/@index/bg.jpg

@index resolves to a directory that is the index file name without the .html extension. In this, if compiling a build for index-diff.html, @index would resolve to "index-diff".

If no file exists after @index is resolved, it simply falls back to the parent directory that would have held the index folder. For index.html, no index folder exists in images so the resolver will import from "./images/bg.jpg" instead and let the developer know

If the resolver still can't find a file after falling back to the parent directory, Webpack will import an error about being unable to resolve the file, per usual

Installation

With NPM:

npm i --save-dev @ff0000-ad-tech/wp-resolve-plugin-index-variation

Then in your Webpack config, require the plugin at the top, instantiate it with the path of the index-specific folder you want to use in your build, and add it to the final config object's resolve.plugins property in an array:

// most likely, webpack.config.js

/* ... */
const IndexVariationResolvePlugin = require('@ff0000-ad-tech/wp-resolve-plugin-index-variation')

/* ... */
const indexName = path.resolve('1-build/300x250/images/index-diff')
module.exports = {
  /* ... */
  resolve: {
    /* ... */
    plugins: [new IndexVariationResolvePlugin(indexName)]
    /* ... */
  }
}