use tinigo to generate wasm (6MB -> 3MB)

Author: gfx

Makefile

@@ -1,8 +1,11 @@
+build: sqldef.wasm
+.PHONY: build
+
 sqldef.wasm: go.mod go.sum sqldef-wasm.go wasm_exec.js
-	GOOS=js GOARCH=wasm go build $(GOFLAGS) -o sqldef.wasm ./sqldef-wasm.go
+	tinygo build -x -o sqldef.wasm -target=wasm ./sqldef-wasm.go
 
 wasm_exec.js:
-	cp $$(go env GOROOT)/lib/wasm/wasm_exec.js .
+	cp $$(tinygo env TINYGOROOT)/targets/wasm_exec.js .
 
 dev: sqldef.wasm
 	@echo "Starting HTTP server at http://localhost:6543"

README.md

@@ -14,9 +14,19 @@ The Go source (`sqldef-wasm.go`) compiles to WebAssembly and exposes a `diff` fu
 
 ## Development
 
+### Prerequisites
+
+Install [TinyGo](https://tinygo.org/):
+
+```sh
+brew tap tinygo-org/tools && brew install tinygo
+```
+
+### Build
+
 ```sh
 # Build the WASM file
-make
+make build
 
 # Start local dev server at http://localhost:6543
 make dev

sqldef-wasm.go

@@ -74,7 +74,7 @@ func main() {
 	c := make(chan bool)
 
 	exports := map[string]any{
-		"diff": js.FuncOf(sqldefDiff),
+		"diff":           js.FuncOf(sqldefDiff),
 		"getFullVersion": js.FuncOf(sqldefGetFullVersion),
 	}
 	js.Global().Set("_SQLDEF", js.ValueOf(exports))