diff --git a/js/build.ts b/js/build.ts
index 347dd4e72c..b2f52dbc14 100644
--- a/js/build.ts
+++ b/js/build.ts
@@ -7,12 +7,19 @@ export interface BuildInfo {
   arch: "x64";
 
   /** The operating system platform. */
-  os: "mac" | "win" | "linux";
+  os: OSType;
 
   /** The GN build arguments */
   gnArgs: string;
 }
 
+/** The operating system platform. */
+export enum OSType {
+  mac = "mac",
+  win = "win",
+  linux = "linux"
+}
+
 // 'build' is injected by rollup.config.js at compile time.
 export const build: BuildInfo = {
   /* eslint-disable @typescript-eslint/no-explicit-any */
diff --git a/js/deno.ts b/js/deno.ts
index cd4ace4dfb..a9f5f20189 100644
--- a/js/deno.ts
+++ b/js/deno.ts
@@ -63,7 +63,7 @@ export { metrics, Metrics } from "./metrics";
 export { resources } from "./resources";
 export { run, RunOptions, Process, ProcessStatus } from "./process";
 export { inspect } from "./console";
-export { build, platform } from "./build";
+export { build, platform, OSType } from "./build";
 export { version } from "./version";
 export const args: string[] = [];