add emscripten support

.cargo/config.toml

@@ -1,2 +1,12 @@
 [target.'cfg(target_arch = "wasm32")']
 runner = 'cargo run -p wasm-bindgen-cli --bin wasm-bindgen-test-runner --'
+
+[build]
+
+[target.'cfg(all(target_arch = "wasm32", target_os = "emscripten"))']
+rustflags = [
+  "-Cllvm-args=-enable-emscripten-cxx-exceptions=0",
+  "-Clink-arg=-sERROR_ON_UNDEFINED_SYMBOLS=0",
+  "-Clink-arg=-Wno-undefined",
+  "-Crelocation-model=static",
+]

crates/cli-support/Cargo.toml

@@ -18,6 +18,7 @@ anyhow = "1.0"
 base64 = "0.22"
 leb128 = "0.2"
 log = "0.4"
+regex = "1"
 rustc-demangle = "0.1.13"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"