Add support for "to" postcss option

[sormy]

Current version if this plugin has hardcoded "to" value to be the same as "from". This breaks a lot of postcss plugins that are relying on source/target filenames to properly rebase asset urls.

Example of affected plugin: https://github.com/sebastian-software/postcss-smart-asset

Technically, any rebase plugin that is relying on from or to won't work as expected with currently hardcoded from and to.

Would you be open to accept a small PR fix that will do this (so "to" could be explicitly passed when it is needed):

diff -ru rollup-plugin-postcss.old/dist/index.js rollup-plugin-postcss/dist/index.js
--- rollup-plugin-postcss.old/dist/index.js	2019-03-03 16:51:52.000000000 -0500
+++ rollup-plugin-postcss/dist/index.js	2019-03-03 17:01:25.000000000 -0500
@@ -185,7 +185,8 @@
       const postcssOpts = _objectSpread({}, _this.options.postcss, config.options, {
         // Followings are never modified by user config config
         from: _this.id,
-        to: _this.id,
+        // Allow overriding `to` for some plugins that are relying on this value
+        to: options.to || _this.id,
         map: _this.sourceMap ? shouldExtract ? {
           inline: false,
           annotation: false
@@ -669,6 +670,9 @@
     /** Postcss config file */
     config: inferOption(options.config, {}),
 
+    /** Postcss target filename hint, for plugins that are relying on it */
+    to: options.to,
+
     /** PostCSS options */
     postcss: {
       parser: options.parser,

[sormy]

Ping!

[sormy]

This issue is still actual even for newer version of this plugin. The fix is small, backward compatible and will improve support for other postcss plugins. Please let me know if you are ok with proposed approach and I will created PR with this change. Thank tou.

[sormy]

Ping!

[sormy]

Here is a PR for this change: #163

[ziofat]

postcss-url is also affected by this issue.
I am trying to use background images in css but rollup will not pack them.
I followed #118 to use postcss-url. However, I don't want to use base64 if the image is big. but the option 'rebase' is not working.

[egoist]

🎉 This issue has been resolved in version 2.3.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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