WASM

.gitignore

@@ -1,3 +1,4 @@
-node_modules
-target
 *.node
+node_modules/
+target/
+pkg/

.prettierrc

@@ -0,0 +1,6 @@
+{
+  "bracketSpacing": false,
+  "endOfLine": "lf",
+  "singleQuote": true,
+  "trailingComma": "all"
+}

Cargo.toml

@@ -8,8 +8,6 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-napi = { version = "1", features = ["serde-json"] }
-napi-derive = "1"
 serde = { version = "1.0.123", features = ["derive"] }
 serde_bytes = "0.11.5"
 cssparser = "0.28.1"
@@ -23,5 +21,18 @@ bitflags = "*"
 [target.'cfg(target_os = "macos")'.dependencies]
 jemallocator = { version = "0.3.2", features = ["disable_initial_exec_tls"] }
 
-[build-dependencies]
-napi-build = { version = "1" }
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+napi = { version = "1", features = ["serde-json"] }
+napi-derive = "1"
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+js-sys = "0.3"
+serde-wasm-bindgen = "0.3.0"
+wasm-bindgen = "0.2"
+
+[target.'cfg(not(target_arch = "wasm32"))'.build-dependencies]
+napi-build = "1"
+
+[profile.release]
+lto = true
+opt-level = 's'

build.rs

@@ -1,5 +1,7 @@
+#[cfg(not(target_arch = "wasm32"))]
 extern crate napi_build;
 
 fn main() {
+  #[cfg(not(target_arch = "wasm32"))]
   napi_build::setup();
 }

native.js

@@ -13,21 +13,8 @@ if (process.platform === 'linux') {
 }
 
 let name = `parcel-css.${parts.join('-')}.node`;
-if (process.env.PARCEL_BUILD_ENV === 'production') {
-  module.exports = require(`./${name}`);
-} else if (process.env.PARCEL_SWC_WASM) {
-  const {transform} = require('./wasm/dist-node/parcel_js_swc_wasm.js');
-
-  module.exports.transform = function(config) {
-    let result = transform(config);
-    return {
-      ...result,
-      // Hydrate Uint8Array into Buffer
-      code: Buffer.from(result.code.buffer),
-    };
-  };
-} else if (require('fs').existsSync(require('path').join(__dirname, name))) {
-  module.exports = require(`./${name}`);
+if (process.env.CSS_TRANSFORMER_WASM) {
+  module.exports = require(`./pkg`);
 } else {
-  module.exports = require(`self-published/${name}`);
+  module.exports = require(`./${name}`);
 }

package.json

@@ -31,6 +31,8 @@
   },
   "scripts": {
     "build": "napi build --platform",
-    "build-release": "napi build --platform --release"
+    "build-release": "napi build --platform --release",
+    "wasm:build": "wasm-pack build --target nodejs",
+    "wasm:build-release": "wasm-pack build --target nodejs --release"
   }
 }

src/lib.rs

@@ -1,6 +1,3 @@
-extern crate napi;
-#[macro_use]
-extern crate napi_derive;
 extern crate serde;
 extern crate serde_bytes;
 extern crate cssparser;
@@ -24,7 +21,6 @@ mod printer;
 mod traits;
 mod macros;
 
-use napi::{CallContext, JsObject, JsBuffer};
 use serde::{Deserialize, Serialize};
 use cssparser::{Parser, ParserInput, RuleListParser};
 use crate::traits::ToCss;
@@ -36,25 +32,62 @@ use std::collections::HashMap;
 
 use parser::TopLevelRuleParser;
 
-#[derive(Serialize, Debug, Deserialize)]
-struct Config {
-  filename: String,
-  #[serde(with = "serde_bytes")]
-  code: Vec<u8>,
-  targets: Option<Browsers>
+// ---------------------------------------------
+
+#[cfg(target_arch = "wasm32")]
+use serde_wasm_bindgen::{from_value};
+#[cfg(target_arch = "wasm32")]
+use wasm_bindgen::prelude::*;
+
+#[cfg(target_arch = "wasm32")]
+#[wasm_bindgen]
+pub fn transform(config_val: JsValue) -> Result<JsValue, JsValue> {
+  let config: Config = from_value(config_val).map_err(JsValue::from)?;
+
+  let code = unsafe { std::str::from_utf8_unchecked(&config.code) };
+
+  Ok(compile(code, true, config.targets).into())
 }
 
+// ---------------------------------------------
+
+#[cfg(not(target_arch = "wasm32"))]
+extern crate napi;
+#[cfg(not(target_arch = "wasm32"))]
+#[macro_use]
+extern crate napi_derive;
+#[cfg(not(target_arch = "wasm32"))]
+use napi::{CallContext, JsObject, JsBuffer};
+
+#[cfg(not(target_arch = "wasm32"))]
 #[js_function(1)]
 fn transform(ctx: CallContext) -> napi::Result<JsBuffer> {
   let opts = ctx.get::<JsObject>(0)?;
   let config: Config = ctx.env.from_js_value(opts)?;
-
   let code = unsafe { std::str::from_utf8_unchecked(&config.code) };
   let res = compile(code, true, config.targets);
 
   Ok(ctx.env.create_buffer_with_data(res.into_bytes())?.into_raw())
 }
 
+#[cfg(not(target_arch = "wasm32"))]
+#[module_exports]
+fn init(mut exports: JsObject) -> napi::Result<()> {
+  exports.create_named_method("transform", transform)?;
+
+  Ok(())
+}
+
+// ---------------------------------------------
+
+#[derive(Serialize, Debug, Deserialize)]
+struct Config {
+  pub filename: String,
+  #[serde(with = "serde_bytes")]
+  pub code: Vec<u8>,
+  pub targets: Option<Browsers>
+}
+
 fn compile(code: &str, minify: bool, targets: Option<Browsers>) -> String {
   let mut input = ParserInput::new(&code);
   let mut parser = Parser::new(&mut input);
@@ -178,13 +211,6 @@ fn compile(code: &str, minify: bool, targets: Option<Browsers>) -> String {
   dest
 }
 
-#[module_exports]
-fn init(mut exports: JsObject) -> napi::Result<()> {
-  exports.create_named_method("transform", transform)?;
-
-  Ok(())
-}
-
 #[cfg(test)]
 mod tests {
   use super::*;