diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6853ab73..72ed562a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+* Expose `metafile` to `onRebuild` in watch mode ([#1057](https://github.com/evanw/esbuild/issues/1057))
+
+    Previously the build results returned to the watch mode `onRebuild` callback was missing the `metafile` property when the `metafile: true` option was present. This bug has been fixed.
+
 ## 0.10.0
 
 **This release contains backwards-incompatible changes.** Since esbuild is before version 1.0.0, these changes have been released as a new minor version to reflect this (as [recommended by npm](https://docs.npmjs.com/cli/v6/using-npm/semver/)). You should either be pinning the exact version of `esbuild` in your `package.json` file or be using a version range syntax that only accepts patch upgrades such as `~0.9.0`. See the documentation about [semver](https://docs.npmjs.com/cli/v6/using-npm/semver/) for more information.
diff --git a/lib/common.ts b/lib/common.ts
index 8a6db1f3..0ffeb61c 100644
--- a/lib/common.ts
+++ b/lib/common.ts
@@ -863,6 +863,11 @@ export function createChannel(streamIn: StreamIn): StreamOut {
           // Factor out response handling so it can be reused for rebuilds
           let rebuild: types.BuildResult['rebuild'] | undefined;
           let stop: types.BuildResult['stop'] | undefined;
+          let copyResponseToResult = (response: protocol.BuildResponse, result: types.BuildResult) => {
+            if (response.outputFiles) result.outputFiles = response!.outputFiles.map(convertOutputFiles);
+            if (response.metafile) result.metafile = JSON.parse(response!.metafile);
+            if (response.writeToStdout !== void 0) console.log(protocol.decodeUTF8(response!.writeToStdout).replace(/\n$/, ''));
+          };
           let buildResponseToResult = (
             response: protocol.BuildResponse | null,
             callback: (error: Error | null, result: types.BuildResult | null) => void,
@@ -871,9 +876,7 @@ export function createChannel(streamIn: StreamIn): StreamOut {
             let warnings = replaceDetailsInMessages(response!.warnings, details);
             if (errors.length > 0) return callback(failureErrorWithLog('Build failed', errors, warnings), null);
             let result: types.BuildResult = { warnings };
-            if (response!.outputFiles) result.outputFiles = response!.outputFiles.map(convertOutputFiles);
-            if (response!.metafile) result.metafile = JSON.parse(response!.metafile);
-            if (response!.writeToStdout !== void 0) console.log(protocol.decodeUTF8(response!.writeToStdout).replace(/\n$/, ''));
+            copyResponseToResult(response!, result);
 
             // Handle incremental rebuilds
             if (response!.rebuildID !== void 0) {
@@ -924,7 +927,7 @@ export function createChannel(streamIn: StreamIn): StreamOut {
                     let warnings = replaceDetailsInMessages(watchResponse.warnings, details);
                     if (errors.length > 0) return watch!.onRebuild!(failureErrorWithLog('Build failed', errors, warnings), null);
                     let result: types.BuildResult = { warnings };
-                    if (watchResponse.outputFiles) result.outputFiles = watchResponse.outputFiles.map(convertOutputFiles);
+                    copyResponseToResult(watchResponse, result);
                     if (watchResponse.rebuildID !== void 0) result.rebuild = rebuild;
                     result.stop = stop;
                     watch!.onRebuild!(null, result);