diff --git a/Cargo.lock b/Cargo.lock
index e100cceb45..f6099f4871 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4026,14 +4026,14 @@ dependencies = [
 
 [[package]]
 name = "mio"
-version = "0.8.6"
+version = "0.8.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b9d9a46eff5b4ff64b45a9e316a6d1e0bc719ef429cbec4dc630684212bfdf9"
+checksum = "927a765cd3fc26206e66b296465fa9d3e5ab003e651c1b3c060e7956d96b19d2"
 dependencies = [
  "libc",
  "log",
  "wasi 0.11.0+wasi-snapshot-preview1",
- "windows-sys 0.45.0",
+ "windows-sys 0.48.0",
 ]
 
 [[package]]
diff --git a/shared/src/types/io.rs b/shared/src/types/io.rs
index 13798cc5b2..462dbef95f 100644
--- a/shared/src/types/io.rs
+++ b/shared/src/types/io.rs
@@ -42,18 +42,41 @@ pub trait Io {
         eprintln!("{}", output.as_ref());
     }
 
-    async fn read() -> tokio::io::Result<String> {
-        read_aux(tokio::io::stdin()).await
+    async fn read() -> std::io::Result<String> {
+        #[cfg(not(target_family = "wasm"))]
+        {
+            read_aux(tokio::io::stdin()).await
+        }
+        #[cfg(target_family = "wasm")]
+        {
+            unreachable!("Wasm should not perform general IO")
+        }
     }
 
     async fn prompt(question: impl AsRef<str>) -> String {
-        prompt_aux(tokio::io::stdin(), tokio::io::stdout(), question.as_ref())
+        #[cfg(not(target_family = "wasm"))]
+        {
+            prompt_aux(
+                tokio::io::stdin(),
+                tokio::io::stdout(),
+                question.as_ref(),
+            )
             .await
+        }
+        #[cfg(target_family = "wasm")]
+        {
+            unreachable!(
+                "Wasm should not perform general IO; received call for input \
+                 with question\n: {}",
+                question.as_ref()
+            )
+        }
     }
 }
 
 /// A generic function for displaying a prompt to users and reading
 /// in their response.
+#[cfg(not(target_family = "wasm"))]
 pub async fn prompt_aux<R, W>(
     mut reader: R,
     mut writer: W,
@@ -74,6 +97,7 @@ where
 }
 
 /// A generic function for reading input from users
+#[cfg(not(target_family = "wasm"))]
 pub async fn read_aux<R>(mut reader: R) -> tokio::io::Result<String>
 where
     R: tokio::io::AsyncReadExt + Unpin,