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Scan block.json to generate a list of files to be copied via CopyWebpackPlugin #39653

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ryanwelcher
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What?

The PR is a first attempt at a solution to allow block.json files to determine what files should be copied from src to the defined build

Why?

Many blocks have files that they need to reference and having them files moved from src to build simplifies working with them This is why the --webpack-copy-php flag was added with #39171.

How?

This PR allows a block to define what files need to be copied by adding a files property to block.json. This should be a comma-separated list of files or glob style patterns ie. "test.xml, *.csv" etc. Each block.json is scanned and a list of files to copy is generated and passed to the CopyWebpackPlugin in the webpack configuration. This PR takes into account whether or not the --webpack-copy-php is set currently but if this approach is adopted, it may not be needed.

Testing Instructions

  1. Create a block using npx @wordpress/create-block@ scripts-test
  2. Add multiple folders into src to represent blocks, giving each a block.json file and adding some extra files ie test.xml and test.php
  3. Add a files entry to the block.json with the values of "files": "text.xml,test.php"
  4. Run node {FULLPATH}/gutenberg/packages/scripts/bin/wp-scripts.js -- build
  5. Confirm that all the files listed are copied to the build directory.

There is a known side-effect in that the files are cumulative and are not copied on a per-block basis. If block one indicates a file to be copied and that same file is present in other block directories, it will be copied even if the file isn't added to the second block.json

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Size Change: 0 B

Total Size: 1.21 MB

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@gziolo
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gziolo commented Mar 28, 2022

Add a files entry to the block.json with the values of "files": "text.xml,test.php"

Interesting idea. It's very tied to the build process and the project configuration. block.json is more about shaping the block definition so I'm a bit worried that we bend its purpose too much. Why should we be even concerned about keeping XML or CSV files in the src folder? I understand that PHP files are necessary for render_callback implementation but I would like to learn more about other ideas.

@gziolo gziolo added [Tool] WP Scripts /packages/scripts [Type] New API New API to be used by plugin developers or package users. labels Mar 28, 2022
@ryanwelcher
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Interesting idea. It's very tied to the build process and the project configuration. block.json is more about shaping the block definition so I'm a bit worried that we bend its purpose too much.

These files may be required for the block to function and may be different for each block. I like that we can copy PHP files from src to build using the --webpack-copy-php but that is for all blocks and being able to define the exact files that should be copied for each block may be beneficial.

For example, if I keep my tests in the block directory and have PHP unit tests, they will be copied over as well, or if I use one template for local dev and another for production etc.

Why should we be even concerned about keeping XML or CSV files in the src folder? I understand that PHP files are necessary for render_callback implementation but I would like to learn more about other ideas.

My intent was to allow any files to be copied from src to build if they are stored there. You make a good point that some of those files may be stored in an alternate folder and accessed there - ie .assets. There may be cases where these files are only pertinent to the block and would make more sense to be in src. I guess I am solving for edge cases but I like to err on the side of flexibility for these kinds of features.

@gziolo
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gziolo commented Sep 15, 2022

In the meantime, @SantosGuillamot added in #43917 automated copying for PHP files referenced in block.json under the newly introduced render field.

@ryanwelcher
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I'm going to close this out.

@ryanwelcher ryanwelcher closed this Oct 4, 2022
@gziolo gziolo deleted the try/block-json-asset-list branch October 4, 2022 16:14
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