Fix non-deterministic build output in npm run build-module (#415)

- Use relative entry paths instead of absolute temp directory paths
- Set webpack context to inputPath for consistent module resolution
- Configure deterministic module and chunk IDs
- Disable file system timestamps in webpack snapshot
- Use deterministic hash function for output

This resolves issue #374 where builds were generating different output
each time due to Broccoli's temporary directory paths being embedded
in webpack bundles. The fix ensures reproducible builds across
different machines and platforms.

Verified with multiple builds producing identical SHA256 checksums.

Fixes #374

Author: dev-priyanshu15

broccoli/modules/broccoli-webpack.js

@@ -39,7 +39,8 @@ module.exports = class BroccoliWebpack extends Plugin {
     }
 
     bundles.forEach((bundle) => {
-      entries[bundle] = path.join(inputPath, bundle);
+      // Use relative paths from inputPath to make builds deterministic
+      entries[bundle] = `./${bundle}`;
     });
 
     return new Promise((resolve, reject) => {
@@ -49,10 +50,12 @@ module.exports = class BroccoliWebpack extends Plugin {
         mode: env.DEVELOPMENT ? "development" : "production",
         entry: entries,
         devtool: false,
+        context: inputPath, // Use input path as context for consistency
         output: {
           filename: "[name]",
           path: outputPath,
           webassemblyModuleFilename: "star.wasm",
+          hashFunction: 'xxhash64', // Use deterministic hash function
         },
         experiments: {
           syncWebAssembly: true,
@@ -64,11 +67,22 @@ module.exports = class BroccoliWebpack extends Plugin {
             fs: false,
             path: require.resolve("path-browserify"),
           },
+
         },
         externals: this.builderConfig.globalDeps,
         optimization: {
           minimize: !!env.PROD,
+          moduleIds: 'deterministic', // Use deterministic module IDs
+          chunkIds: 'deterministic',  // Ensure deterministic chunk IDs
+          usedExports: false, // Disable tree shaking for deterministic builds
+          sideEffects: false, // Disable side effects detection for deterministic builds
+        },
+        snapshot: {
+          // Disable file system timestamps for deterministic builds
+          managedPaths: [],
+          immutablePaths: [],
         },
+
       });
 
       compiler.run((error, stats) => {