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Support new URL("./image.png", import.meta.url) Asset modules #894

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xiaoxiangmoe opened this issue Oct 11, 2020 · 10 comments
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Support new URL("./image.png", import.meta.url) Asset modules #894

xiaoxiangmoe opened this issue Oct 11, 2020 · 10 comments
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enhancement New feature or request

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@xiaoxiangmoe
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Webpack 5 support new URL("./image.png", import.meta.url) as asset modules.

Can vite support it?
@remorses
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it will work in development with any file, to work in build mode you should use the public directory (the files in public will be copied by rollup to out directory)

@yyx990803 yyx990803 added the enhancement New feature or request label Jan 8, 2021
@yyx990803
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Should be possible with https://modern-web.dev/docs/building/rollup-plugin-import-meta-assets/

@jiangfengming
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Here you go https://www.npmjs.com/package/rollup-plugin-import-meta-url-to-module

@xiaoxiangmoe
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@jiangfengming Your plugin is not type-safe. It's URL in IDE and it's string after compile.

@jiangfengming
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@jiangfengming Your plugin is not type-safe. It's URL in IDE and it's string after compile.

fixed.

@xiaoxiangmoe
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@jiangfengming What's difference with @web/rollup-plugin-import-meta-assets?

example: https://modern-web.dev/docs/building/rollup-plugin-import-meta-assets/#examples

@jiangfengming
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jiangfengming commented Jan 27, 2021 •
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@jiangfengming What's difference with @web/rollup-plugin-import-meta-assets?

example: https://modern-web.dev/docs/building/rollup-plugin-import-meta-assets/#examples

That plugin just doesn't work with vite.

If put it into plugins field, the code would be transformed into new URL(import.meta.ROLLUP_FILE_URL_1, import.meta.url), but import.meta.ROLLUP_FILE_URL_1 is undefined at runtime.

If put it into build.rollupOptions.plugins section, the generated code would be something like new URL(new URL("foo.688baecb.png",t.url).href,t.url)', but t.url(import.meta.url) is undefined` in production build. So it will fail to construct URL because lack of origin.

And @web/rollup-plugin-import-meta-assets doesn't obey build.assetsInlineLimit option.

@rdmurphy
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rdmurphy commented Mar 13, 2021 •
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I've been poking on this as well (I'm also familiar with and have used @web/rollup-plugin-import-meta-assets in other contexts) and ultimately the issue (though not without reason) rests with esbuild here. esbuild is pretty strict about honoring a minimum target of es2019 and essentially gives up on import.meta by converting it into {}. This is because technically import.meta didn't become spec until es2020. It just works in vanilla Rollup because it leaves it as-is in esm mode and rewrites it away in the other build modes.

I'm not quite sure what the answer would be for vite here — it's ideally something handled upstream at esbuild. An alternative is vite handles morphing any use of import.meta.url itself so esbuild doesn't get the chance to alter it. In theory this is also true for dynamic imports (an es2020 feature that explicitly gets ported back) so there is a minor precedence.

Semi-related esbuild issue here: evanw/esbuild#795

@kabouzeid kabouzeid mentioned this issue Apr 13, 2021
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@karlhorky
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karlhorky commented Apr 22, 2021 •
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Here's a demo of the new syntax with ES Modules without a bundler:

https://codesandbox.io/s/import-image-paths-in-js-without-bundler-cbqpk

Code:

<!DOCTYPE html>
<html>
  <body>
    <img />
    <script type="module">
      const url = new URL("./wp.png", import.meta.url);
      document.querySelector("img").src = url;
    </script>
  </body>
</html>

@haoqunjiang
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Supported since v2.4 4cbb40d

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@rdmurphy @yyx990803 @karlhorky @haoqunjiang @xiaoxiangmoe @jiangfengming @remorses