chore: Dash of readme

packages/io-utils/README.md

@@ -29,3 +29,19 @@ yarn install @layerzerolabs/io-utils
 ```bash
 npm install @layerzerolabs/io-utils
 ```
+
+## API Documentation
+
+### Filesystem utilities
+
+#### isDirectory(path)
+
+Returns `true` if specified filesystem `path` points to a directory, `false` otherwise. Does not throw if `path` does not exist on the filesystem, instead returns `false`
+
+#### isFile(path)
+
+Returns `true` if specified filesystem `path` points to a file, `false` otherwise. Does not throw if `path` does not exist on the filesystem, instead returns `false`
+
+#### isReadable(path)
+
+Returns `true` if specified filesystem `path` can be read by the current user, `false` otherwise. Does not throw if `path` does not exist on the filesystem, instead returns `false`

packages/io-utils/src/filesystem/filesystem.ts

@@ -1,22 +1,22 @@
 import { accessSync, constants, lstatSync } from 'fs'
 
-export const isDirectory = (path: string) => {
+export const isDirectory = (path: string): boolean => {
     try {
         return lstatSync(path).isDirectory()
     } catch {
         return false
     }
 }
 
-export const isFile = (path: string) => {
+export const isFile = (path: string): boolean => {
     try {
         return lstatSync(path).isFile()
     } catch {
         return false
     }
 }
 
-export const isReadable = (path: string) => {
+export const isReadable = (path: string): boolean => {
     try {
         return accessSync(path, constants.R_OK), true
     } catch {