Add wasm flag

Author: geofflittle

Cargo.lock

@@ -34,6 +34,8 @@ server-local = ["storage-sqlite"]
 storage = ["storage-sqlite"]
 # Support for SQLite task storage
 storage-sqlite = ["dep:rusqlite", "dep:tokio-rusqlite"]
+# Support for the in-memory storage backend (WASM-compatible)
+storage-inmemory = []
 # (private) Support for sync protocol encryption
 encryption = ["dep:ring"]
 # (private) Generic support for cloud sync
@@ -42,6 +44,8 @@ cloud = []
 bundled = ["rusqlite/bundled", "tokio-rusqlite/bundled"]
 # use native CA roots, instead of bundled
 tls-native-roots = ["ureq/native-certs"]
+# Feature for wasm builds. This enables wasm-compatible storage.
+wasm = ["storage-inmemory"]
 
 [package.metadata.docs.rs]
 all-features = true
@@ -62,16 +66,26 @@ serde_json = "^1.0"
 serde = { version = "^1.0.147", features = ["derive"] }
 strum = "0.27"
 strum_macros = "0.27"
-tokio = { version = "1", features = ["rt-multi-thread", "macros"] }
 thiserror = "2.0"
 ureq = { version = "^2.12.1", features = ["tls"], optional = true }
 uuid = { version = "^1.16.0", features = ["serde", "v4"] }
 url = { version = "2", optional = true }
 async-trait = "0.1.89"
 tokio-rusqlite = { version = "0.6.0", optional = true }
+# Use only WASM-compatible features by default
+tokio = { version = "1", features = ["macros"] }
+
+# For non-WASM targets, enable the multi-threaded runtime
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+tokio = { version = "1", features = ["rt-multi-thread"] }
+
+# For WASM targets, enable the single-threaded runtime and WASM-friendly uuid features
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+tokio = { version = "1", features = ["rt"] }
+uuid = { version = "^1.16.0", features = ["js"] }
 
 [dev-dependencies]
 proptest = "^1.7.0"
 tempfile = "3"
 rstest = "0.26"
-pretty_assertions = "1"
+pretty_assertions = "1"

Cargo.toml

@@ -19,7 +19,9 @@ pub use depmap::DependencyMap;
 pub use errors::Error;
 pub use operation::{Operation, Operations};
 pub use replica::Replica;
-pub use server::{Server, ServerConfig};
+pub use server::Server;
+#[cfg(feature = "sync")]
+pub use server::ServerConfig;
 pub use task::{utc_timestamp, Annotation, Status, Tag, Task, TaskData};
 pub use workingset::WorkingSet;
 

src/lib.rs

@@ -1,4 +1,6 @@
+#[cfg(feature = "sync")]
 use super::types::Server;
+#[cfg(feature = "sync")]
 use crate::errors::Result;
 #[cfg(feature = "server-aws")]
 pub use crate::server::cloud::aws::AwsCredentials;
@@ -12,17 +14,18 @@ use crate::server::cloud::CloudServer;
 use crate::server::local::LocalServer;
 #[cfg(feature = "server-sync")]
 use crate::server::sync::SyncServer;
-use std::{
-    path::PathBuf,
-    sync::{Arc, Mutex},
-};
+#[cfg(feature = "sync")]
+use std::path::PathBuf;
+#[cfg(feature = "sync")]
+use std::sync::{Arc, Mutex};
 #[cfg(feature = "server-sync")]
 use uuid::Uuid;
 
 /// The configuration for a replica's access to a sync server.
 ///
 /// This enum is non-exhaustive, as users should only be constructing required
 /// variants, not matching on it.
+#[cfg(feature = "sync")]
 #[non_exhaustive]
 pub enum ServerConfig {
     /// A local task database, for situations with a single replica.
@@ -96,6 +99,7 @@ pub enum ServerConfig {
     },
 }
 
+#[cfg(feature = "sync")]
 impl ServerConfig {
     /// Get a server based on this configuration
     pub fn into_server(self) -> Result<Arc<Mutex<dyn Server + Send>>> {

src/server/config.rs

@@ -28,6 +28,7 @@ mod sync;
 #[cfg(feature = "cloud")]
 mod cloud;
 
+#[cfg(feature = "sync")]
 pub use config::*;
 pub use types::*;