Scope glimmer-scoped-css styles by package-relative path

patches/glimmer-scoped-css@0.8.1.patch

@@ -0,0 +1,47 @@
+diff --git a/dist/ast-transform-8c8ef165.js b/dist/ast-transform-8c8ef165.js
+index 066d5bc5f9e350d855d7d48ae56f47b4e33907bc..3483e529a009cbe4b6019ada0c332411b660595a 100644
+--- a/dist/ast-transform-8c8ef165.js
++++ b/dist/ast-transform-8c8ef165.js
+@@ -164,8 +164,41 @@ function decodeCSS(encodedCSSString) {
+   return new TextDecoder().decode(Uint8Array.from(binString, m => m.codePointAt(0)));
+ }
+
++// The scope prefix must be the same for the same source on every machine:
++// prerendered HTML carries the prefixes of the build that rendered it, and a
++// build at another path must still style it. A file on disk is identified by
++// its path relative to the working directory of the build. Anything else keeps
++// its filename, including the synthetic paths a realm transpiles under
++// (`/spec.gts`), which do not exist on disk and are already stable. Both
++// paths are resolved through symlinks first: `process.cwd()` is always
++// resolved, and a filename reached through a symlink would otherwise give a
++// path up to the root and back down, which holds the absolute path again.
++function cwdRelativeId(filename) {
++  let fs;
++  try {
++    fs = require('fs');
++  } catch {
++    return undefined;
++  }
++  if (
++    !fs ||
++    typeof fs.existsSync !== 'function' ||
++    typeof fs.realpathSync !== 'function' ||
++    typeof process === 'undefined' ||
++    typeof process.cwd !== 'function' ||
++    typeof filename !== 'string' ||
++    !path.isAbsolute(filename) ||
++    !fs.existsSync(filename)
++  ) {
++    return undefined;
++  }
++  return path
++    .relative(fs.realpathSync(process.cwd()), fs.realpathSync(filename))
++    .split(path.sep)
++    .join('/');
++}
+ function uniqueIdentifier(filename) {
+-  return superFastMd5.md5(filename).slice(0, 10);
++  return superFastMd5.md5(cwdRelativeId(filename) ?? filename).slice(0, 10);
+ }
+ function generateScopedCSSPlugin(options) {
+   return env => {

pnpm-workspace.yaml

@@ -329,6 +329,7 @@ patchedDependencies:
   matrix-js-sdk@38.3.0: patches/matrix-js-sdk@38.3.0.patch
   ember-source: patches/ember-source.patch
   object-inspect: patches/object-inspect.patch
+  glimmer-scoped-css@0.8.1: patches/glimmer-scoped-css@0.8.1.patch
 allowBuilds:
   "@percy/core": true
   "@vscode/vsce-sign": true