Implement js bindings

Author: Emil Sjölander

.circleci/config.yml

@@ -24,6 +24,7 @@ jobs:
           paths:
             - ~/.cargo
             - ./target
+
   ios:
     macos:
       xcode: "10.0.0"
@@ -32,10 +33,36 @@ jobs:
       - checkout
       - run: cd bindings/swift && xcodebuild test -workspace Example/StretchKit.xcworkspace -scheme StretchKit -destination 'platform=iOS Simulator,name=iPhone XR,OS=12.0'
 
+  js:
+    docker:
+      - image: rust:1
+
+    steps:
+      - checkout
+
+      - restore_cache:
+          key: target-cache
+
+      - run: rustc --version; cargo --version; rustup --version
+      - run: rustup component add rustfmt
+      - run: rustup component add clippy
+      - run: cargo install wasm-pack
+      - run: cargo fmt -- --check
+      - run: wasm-pack test --node
+      - run: cargo clippy
+      - run: cargo bench
+
+      - save_cache:
+          key: target-cache
+          paths:
+            - ~/.cargo
+            - ./target
 
 workflows:
   version: 2
   test_all:
     jobs:
       - core
       - ios
+      - js
+

.gitignore

@@ -2,6 +2,7 @@
 /scripts/gentest/target
 /bindings/kotlin/stretch/src/main/rust/target
 /bindings/swift/StretchCore/target
+/bindings/js/target
 
 **/*.rs.bk
 Cargo.lock

bindings/js/Cargo.toml

@@ -0,0 +1,38 @@
+[package]
+name = "stretch-js"
+version = "0.2.2"
+authors = ["Visly Inc. <[email protected]>"]
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[features]
+default = ["console_error_panic_hook"]
+
+[dependencies]
+wasm-bindgen = "0.2"
+js-sys = "0.3"
+stretch = "0.2.2"
+
+# The `console_error_panic_hook` crate provides better debugging of panics by
+# logging them with `console.error`. This is great for development, but requires
+# all the `std::fmt` and `std::panicking` infrastructure, so isn't great for
+# code size when deploying.
+console_error_panic_hook = { version = "0.1.1", optional = true }
+
+# `wee_alloc` is a tiny allocator for wasm that is only ~1K in code size
+# compared to the default allocator's ~10K. It is slower than the default
+# allocator, however.
+#
+# Unfortunately, `wee_alloc` requires nightly Rust when targeting wasm for now.
+wee_alloc = { version = "0.4.2", optional = true }
+
+[dev-dependencies]
+wasm-bindgen-test = "0.2"
+
+[profile.release]
+opt-level = "s"
+
+[workspace]
+members = []