fixup! fix(@angular/build): support incremental asset updates and output cleanup in library watch mode

Author: alan-agius4

packages/angular/build/src/builders/library/pipeline/assets.ts

@@ -26,7 +26,7 @@ export interface CollectedAssets {
 
 interface AssetMatcher {
   asset: NormalizedLibraryOptions['assets'][number];
-  posixInputPrefix: string;
+  prefix: string;
   isMatch: picomatch.Matcher;
 }
 
@@ -68,12 +68,12 @@ export async function collectAssetsToEmit(
         }
       }
 
-      for (const { asset, posixInputPrefix, isMatch } of matchers) {
-        if (!file.startsWith(posixInputPrefix)) {
+      for (const { asset, prefix, isMatch } of matchers) {
+        if (!file.startsWith(prefix)) {
           continue;
         }
 
-        const relative = file.slice(posixInputPrefix.length);
+        const relative = file.slice(prefix.length);
         if (!isMatch(relative)) {
           continue;
         }
@@ -108,13 +108,13 @@ function getAssetMatchers(assets: NormalizedLibraryOptions['assets']): AssetMatc
   let matchers = assetMatcherCache.get(assets);
   if (!matchers) {
     matchers = assets.map((asset) => {
-      const posixInput = asset.input.replace(/\/+$/, '');
       const isMatch = picomatch(asset.glob, {
         dot: true,
         ignore: [...DEFAULT_ASSET_IGNORE, ...(asset.ignore ?? [])],
       });
+      const prefix = asset.input.endsWith('/') ? asset.input : `${asset.input}/`;
 
-      return { asset, posixInputPrefix: `${posixInput}/`, isMatch };
+      return { asset, prefix, isMatch };
     });
     assetMatcherCache.set(assets, matchers);
   }