diff --git a/src/build/build.ts b/src/build/build.ts
index dc338fe..d33a382 100644
--- a/src/build/build.ts
+++ b/src/build/build.ts
@@ -1,9 +1,26 @@
+export interface Platform {
+    /**
+     * The architecture
+     */
+    arch: 'x86_64' | 'aarch64' | string;
+};
+
+type PackagePhase = (task: PackageTask) => Promise<void>;
+
+/**
+ * Sufficient information for representing current packaging platform.
+ */
+export interface PackagePlatform {
+    hostPlatform: Platform;
+    buildPlatform: Platform;
+}
+
 export interface PackageTask {
     name: string;
-    patchPhase?: (task: PackageTask) => Promise<void>;
-    configurePhase?: (task: PackageTask) => Promise<void>;
-    buildPhase?: (task: PackageTask) => Promise<void>;
-    installPhase?: (task: PackageTask) => Promise<void>;
+    patchPhase?: PackagePhase;
+    configurePhase?: PackagePhase;
+    buildPhase?: PackagePhase;
+    installPhase?: PackagePhase;
     [key: string]: any;
 }