Import application JS as a module #178
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This was referenced Nov 27, 2023
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Bun.js generates JS bundles in the ESM format and they need be imported with the `type="module"` attribute. Otherwise the module varibles end up in the global scope. See hotwired/turbo#1077 This commit updates the install generator to add the type="module" attribute to the default `javascript_include_tag`. `defer` is no longer needed, as JS modules are deferred by default. Ref. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules#other_differences_between_modules_and_standard_scripts This PR also updates the default config to ensure that all bundlers are configured to output ESM bundles. - bun only supports ESM at the moment https://bun.sh/docs/bundler#format - esbuild is configured to output ESM with the --format=esm flag https://esbuild.github.io/api/#format-esm - webpacker is configured to output ESM bundles with `output.chunkFormat` https://webpack.js.org/configuration/output/#outputchunkformat - rollup is configured to output ESM bundles with `output.format` https://rollupjs.org/configuration-options/#output-format
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The default
javascript_include_tagadded toapplication.html.erbhastype='text/javascript', which can cause problems when the bundler output is in ESM format. If the bundler outputs ESM code, we need to import it withtype="module". Otherwise the module varibles end up in the global scope. See hotwired/turbo#1077This is especially problematic for bun.js, because bun can only emit
ESMcode at the moment.This PR updates the install generator to add the
type="module"attribute to the defaultjavascript_include_tag.deferis no longer needed, as JS modules are deferred by default.Ref. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules#other_differences_between_modules_and_standard_scripts
This PR also updates the default config to ensure that all bundlers output ESM bundles.
--format=esmflag https://esbuild.github.io/api/#format-esmoutput.chunkFormathttps://webpack.js.org/configuration/output/#outputchunkformatoutput.formathttps://rollupjs.org/configuration-options/#output-format