Change Rust tiny-secp256k1 lib and remove wasm-pack

.gitignore

@@ -1,7 +1,6 @@
-.DS_Store
-package-lock.json
 /node_modules
 /pkg
-/rust/target
-/rust/pkg
-/tmp
+/target
+
+.DS_Store
+package-lock.json

Cargo.toml

@@ -0,0 +1,12 @@
+[workspace]
+members = [
+  "secp256k1",
+  "secp256k1-wasm"
+]
+
+[profile.release]
+# https://rust-embedded.github.io/book/unsorted/speed-vs-size.html#optimize-for-size
+# Before activate "s", need to verify with benchmark that performance change is acceptable.
+# opt-level = "s"
+lto = true
+codegen-units = 1

Makefile

@@ -0,0 +1,20 @@
+build:
+	cargo build --release -p secp256k1-wasm --target wasm32-unknown-unknown
+	wasm-bindgen --out-dir pkg --target nodejs target/wasm32-unknown-unknown/release/secp256k1_wasm.wasm
+	wasm-opt -O4 pkg/secp256k1_wasm_bg.wasm --output pkg/secp256k1_wasm_bg.wasm
+
+build-debug:
+	cargo build -p secp256k1-wasm --target wasm32-unknown-unknown
+	wasm-bindgen --out-dir pkg --target nodejs --debug --no-demangle --keep-debug target/wasm32-unknown-unknown/debug/secp256k1_wasm.wasm
+
+clean:
+	rm -rf node_modules pkg target 
+
+# TODO: add js format (prettier?)
+format:
+	cargo-fmt
+
+# TODO: add js linter (same as fmt, prettier?)
+lint:
+	cargo fmt -- --check
+	cargo clippy