Layouts: Add boolItem, export NamedLayoutItem (#486)

core/base/src/utils/layout/layout.ts

@@ -182,7 +182,7 @@ export type BytesLayoutItem =
   LengthPrefixedLayoutBytes;
 export type ArrayLayoutItem = FixedLengthArray | LengthPrefixedArray | RemainderArray;
 export type LayoutItem = NumLayoutItem | BytesLayoutItem | ArrayLayoutItem | SwitchLayoutItem;
-type NamedLayoutItem = LayoutItem & { readonly name: string };
+export type NamedLayoutItem = LayoutItem & { readonly name: string };
 export type ProperLayout = readonly NamedLayoutItem[];
 export type Layout = LayoutItem | ProperLayout;
 

core/definitions/src/layout-items/boolean.ts

@@ -0,0 +1,10 @@
+import { CustomConversion, UintLayoutItem } from "@wormhole-foundation/sdk-base";
+
+export const boolItem = {
+  binary: "uint",
+  size: 1,
+  custom: {
+    to: (encoded: number): boolean => encoded > 0,
+    from: (val: boolean): number => (val ? 1 : 0),
+  } satisfies CustomConversion<number, boolean>,
+} as const satisfies UintLayoutItem;

core/definitions/src/layout-items/index.ts

@@ -1,4 +1,5 @@
 export * from "./amount.js";
+export * from "./boolean.js";
 export * from "./chain.js";
 export * from "./circle.js";
 export * from "./guardianSet.js";