fix(rollup, webpack): print license in bundled file #2487
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The output matches expectations, so that's good!
Do we care about preservation of the vtk.js license in downstream app bundles? If so, we will need to start the license block with a /*! . Additionally, one concern I have with the ESM build is the potential for the license to be replicated many times, once per unique vtk.js import. This will have to be tested to be sure.
rollup.config.js
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| intro() { | ||
| return `/* ${fs.readFileSync( | ||
| path.resolve(__dirname, './LICENSE'), | ||
| 'utf8' | ||
| )} */`; | ||
| }, |
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Is intro() called once overall, or once per file? If the latter, it's best to not have the overhead of reading the LICENSE file multiple times. If just once overall, then this is fine.
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It is run for the output for which it is in the output options so here for all outputs in outputdir. I'll make an update for that.
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The license is printed only in vtk.js file now. However, I did not get to do it without creating another entry/output "rule" for that.
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FYI the vtk.js file isn't the ESM build's entrypoint. I think it's the index.js file. That being said, the import strategy we have doesn't go through a single file, so we would need to consider how we want the vtk.js license to show up in downstream builds.
@finetjul would we consider a single license header in the vtk.js file to be sufficient? Or in each outputted .js file? We would still have the issue of preserving the license header if we output to each .js file, but we may not have any such license header if the user doesn't include vtk.js.
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@finetjul so currently the license is printed in the vtk.js file but as said by Forrest, if the user does not include the vtk.js file it will not be written.
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rollup.config.js
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| format: 'es', | ||
| hoistTransitiveImports: false, | ||
| intro() { | ||
| return `/* ${fs.readFileSync( |
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Do we want to preserve the license in downstream apps that build using vtk.js? This is typically accomplished via /*! or a line with @license.
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Needing to preserve will complicate how we get it to be preserved...
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Lot's of |
My bad, it should be build commits, only one commit in the end even. |
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Configuration of Webpack and Rollup have been updated to write license file content in bundles (in prod and dev builds) for esm and umd builds.
npm run reformatto have correctly formatted code