Add WASM/JS support via wasm-bindgen

Fixes #32

Cargo.toml

@@ -15,6 +15,10 @@ readme = "README.md"
 bitflags = "1.0"
 smallvec = "1.0"
 
+[target.'cfg(target_arch="wasm32")'.dependencies]
+wasm-bindgen = { version = "0.2", optional = true }
+js-sys = { version = "0.3", optional = true }
+
 [build-dependencies]
 cc = { version = "1.0", optional = true }
 
@@ -32,9 +36,12 @@ internal-tests = []
 c-tests = ["cc", "internal-tests"] # and ebur128-c, quickcheck, quickcheck_macros, rand but dev-dependencies can't be optional...
 reference-tests = []
 capi = []
+wasm = ["wasm-bindgen", "js-sys"]
 
 [lib]
 name = "ebur128"
+# Needed for wasm-bindgen...
+crate-type = ["cdylib", "rlib"]
 
 [package.metadata.capi]
 min_version = "0.6.12"
@@ -53,6 +60,10 @@ version = "1.2.4"
 name = "ebur128"
 version = "1.2.4"
 
+[package.metadata.wasm-pack.profile.release]
+# See https://github.com/rustwasm/wasm-pack/issues/886
+wasm-opt = ["-Oz", "--enable-mutable-globals"]
+
 [[bench]]
 name = "interp"
 harness = false

src/lib.rs

@@ -78,3 +78,6 @@ pub mod tests {
 #[cfg(feature = "capi")]
 #[allow(clippy::missing_safety_doc)]
 pub mod capi;
+
+#[cfg(all(feature = "wasm", target_arch = "wasm32"))]
+pub mod wasm;