Add WASI support for gloo-history. (rustwasm#405)

* feat: Support WASI target.

* fix: More friendly error message for wasi target.

* fix: Use target_os instead of feature.

crates/history/src/utils.rs

@@ -2,16 +2,17 @@ use std::cell::RefCell;
 use std::rc::{Rc, Weak};
 use std::sync::atomic::{AtomicU32, Ordering};
 
+#[cfg(not(target_os = "wasi"))]
 use wasm_bindgen::throw_str;
 
-#[cfg(not(target_arch = "wasm32"))]
+#[cfg(any(not(target_arch = "wasm32"), target_os = "wasi"))]
 pub(crate) fn get_id() -> u32 {
     static ID_CTR: AtomicU32 = AtomicU32::new(0);
 
     ID_CTR.fetch_add(1, Ordering::SeqCst)
 }
 
-#[cfg(target_arch = "wasm32")]
+#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))]
 pub(crate) fn get_id() -> u32 {
     static ID_CTR: AtomicU32 = AtomicU32::new(0);
     static INIT: std::sync::Once = std::sync::Once::new();
@@ -30,19 +31,28 @@ pub(crate) fn get_id() -> u32 {
 
 pub(crate) fn assert_absolute_path(path: &str) {
     if !path.starts_with('/') {
+        #[cfg(not(target_os = "wasi"))]
         throw_str("You cannot use relative path with this history type.");
+        #[cfg(target_os = "wasi")]
+        panic!("You cannot use relative path with this history type.");
     }
 }
 
 pub(crate) fn assert_no_query(path: &str) {
     if path.contains('?') {
+        #[cfg(not(target_os = "wasi"))]
         throw_str("You cannot have query in path, try use a variant of this method with `_query`.");
+        #[cfg(target_os = "wasi")]
+        panic!("You cannot have query in path, try use a variant of this method with `_query`.");
     }
 }
 
 pub(crate) fn assert_no_fragment(path: &str) {
     if path.contains('#') {
+        #[cfg(not(target_os = "wasi"))]
         throw_str("You cannot use fragments (hash) in memory history.");
+        #[cfg(target_os = "wasi")]
+        panic!("You cannot use fragments (hash) in memory history.");
     }
 }
 

crates/history/tests/query.rs

@@ -1,8 +1,8 @@
 #![cfg(feature = "query")]
 
-#[cfg(target_arch = "wasm32")]
+#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))]
 use wasm_bindgen_test::{wasm_bindgen_test as test, wasm_bindgen_test_configure};
-#[cfg(target_arch = "wasm32")]
+#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))]
 wasm_bindgen_test_configure!(run_in_browser);
 
 use gloo_history::query::*;