Avoid triggering ember.js#19392 with synthetic attr nodes (#271)

Author: dfreeman

CHANGELOG.md

@@ -1,5 +1,9 @@
 ## Unreleased
 
+## 1.6.2 (March 23, 2021)
+### Fixed
+- Avoid triggering (ember.js#19392)[https://github.com/emberjs/ember.js/issues/19392] when we produce synthetic class `AttrNode`s.
+
 ## 1.6.0 (November 19, 2021)
 ### Added
 - You can now pass `patchClassicComponent: false` in your ECM config to opt out of the deprecated monkeypatching of `Ember.Component` that will be removed entirely in 2.0 (thanks @SergeAstapov!)

packages/ember-css-modules/lib/htmlbars-plugin/index.js

@@ -152,7 +152,18 @@ module.exports = class ClassTransformPlugin {
 
     utils.pushAll(parts, this.localToPath(localClassAttr.value));
     this.divide(parts, this.isGlimmer ? 'text' : 'string');
-    node.attributes.unshift(this.builders.attr('class', this.builders.concat(parts)));
+
+    let newClassAttr = this.builders.attr('class', this.builders.concat(parts));
+    node.attributes.unshift(newClassAttr);
+
+    // In new-enough versions of Ember (>= 3.25 or so), we need to create a
+    // fake good-enough `loc` whose content will start with `class=` to avoid
+    // triggering https://github.com/emberjs/ember.js/issues/19392
+    if (typeof localClassAttr.loc.slice === 'function') {
+      newClassAttr.loc = localClassAttr.loc.slice({
+        skipStart: 'local-'.length,
+      });
+    }
   }
 
   localToPath(node) {

packages/ember-css-modules/package.json

@@ -1,6 +1,6 @@
 {
   "name": "ember-css-modules",
-  "version": "1.6.1",
+  "version": "1.6.2",
   "description": "CSS Modules for ambitious applications",
   "scripts": {
     "build": "ember build",