fix: make webpack cache work (#479)

* fix: make webpack cache work * chore(repack): add changeset for webpack caching fix --------- Co-authored-by: Rafał Zakrzewski <[email protected]>
callstack · Dec 18, 2023 · b1ad518 · b1ad518
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diff --git a/.changeset/serious-hairs-thank.md b/.changeset/serious-hairs-thank.md
@@ -0,0 +1,6 @@
+---
+"testerapp": patch
+"@callstack/repack": patch
+---
+
+Added the ability to fully leverage the webpack built-in caching mechanism to optimise cold build times.
diff --git a/packages/TesterApp/webpack.config.mjs b/packages/TesterApp/webpack.config.mjs
@@ -61,6 +61,10 @@ export default (env) => {
         entries: false,
       },
     },
+    cache: {
+      type: 'filesystem',
+      name: `${platform}-${mode}`,
+    },
     /**
      * `getInitializationEntries` will return necessary entries with setup and initialization code.
      * If you don't want to use Hot Module Replacement, set `hmr` option to `false`. By default,

diff --git a/packages/repack/src/commands/bundle.ts b/packages/repack/src/commands/bundle.ts
@@ -104,5 +104,17 @@ export async function bundle(
         }
       }
     });
+    // eslint-disable-next-line promise/prefer-await-to-then
+  }).then(() => {
+    return new Promise<void>((resolve, reject) => {
+      // make cache work: https://webpack.js.org/api/node/#run
+      compiler.close((error) => {
+        if (error) {
+          reject();
+        } else {
+          resolve();
+        }
+      });
+    });
   });
 }