Export useful types in mod.ts

mod.ts

@@ -6,3 +6,6 @@ export { default as readOnlyPolicy } from './src/policies/read-only-policy.ts';
 
 export { readStdin, writeStdout } from './src/io.ts';
 export { default as pipeline } from './src/pipeline.ts';
+
+export type { Event, InputMessage, OutputMessage, Policy } from './src/types.ts';
+export type { PolicyTuple } from './src/pipeline.ts';

src/pipeline.ts

@@ -33,3 +33,5 @@ function toTuple<T>(item: PolicyTuple<T> | Policy<T>): PolicyTuple<T> {
 }
 
 export default pipeline;
+
+export type { PolicyTuple };