feat: add repl demo

Signed-off-by: Christian Stewart <christian@aperture.us>

Author: paralin

.github/renovate.json

@@ -12,6 +12,13 @@
       "matchManagers": ["gomod"],
       "matchDepTypes": ["replace"],
       "enabled": false
+    },
+    {
+      "matchManagers": ["gomod"],
+      "matchPackageNames": [
+        "github.com/paralin/go-quickjs-wasi",
+      ],
+      "enabled": false
     }
   ]
 }

repl/.gitignore

@@ -0,0 +1,2 @@
+vendor
+repl

repl/go.mod

@@ -0,0 +1,8 @@
+module github.com/paralin/go-quickjs-wasi/repl
+
+go 1.24.4
+
+require (
+	github.com/paralin/go-quickjs-wasi v0.10.2-0.20250704023701-828038c31a0f
+	github.com/tetratelabs/wazero v1.9.0
+)

repl/go.sum

@@ -0,0 +1,4 @@
+github.com/paralin/go-quickjs-wasi v0.10.2-0.20250704023701-828038c31a0f h1:aKm7CtT5xA1lbVZ0QiSVZcg8igR8LoUw8BMiwjHrggU=
+github.com/paralin/go-quickjs-wasi v0.10.2-0.20250704023701-828038c31a0f/go.mod h1:xCQtRFXtSfOH63fUqZNtIZRBsYFcpo09xb1vLBD9VgU=
+github.com/tetratelabs/wazero v1.9.0 h1:IcZ56OuxrtaEz8UYNRHBrUa9bYeX9oVY93KspZZBf/I=
+github.com/tetratelabs/wazero v1.9.0/go.mod h1:TSbcXCfFP0L2FGkRPxHphadXPjo1T6W+CseNNY7EkjM=

repl/repl.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"context"
+	"log"
+	"os"
+
+	quickjswasi "github.com/paralin/go-quickjs-wasi"
+	"github.com/tetratelabs/wazero"
+	"github.com/tetratelabs/wazero/imports/wasi_snapshot_preview1"
+	"github.com/tetratelabs/wazero/sys"
+)
+
+func main() {
+	// Choose the context to use for function calls.
+	ctx := context.Background()
+
+	// Create a new WebAssembly Runtime.
+	r := wazero.NewRuntime(ctx)
+	defer r.Close(ctx) // This closes everything this Runtime created.
+
+	// Configure the module with stdin, stdout, and stderr.
+	config := wazero.NewModuleConfig().
+		WithStdin(os.Stdin).
+		WithStdout(os.Stdout).
+		WithStderr(os.Stderr)
+
+	// Instantiate WASI, which implements system call APIs.
+	// This is required for the Wasm module to print to the console.
+	wasi_snapshot_preview1.MustInstantiate(ctx, r)
+
+	// Instantiate the Wasm module with just the wasm filename as argument.
+	// This will automatically run the "_start" function of the module.
+	mod, err := r.InstantiateWithConfig(ctx, quickjswasi.QuickJSWASM, config.WithArgs(quickjswasi.QuickJSWASMFilename))
+	if err != nil {
+		// Note: Most compilers do not exit the module after running "_start",
+		// unless there was an error. This allows you to call exported functions.
+		if exitErr, ok := err.(*sys.ExitError); ok && exitErr.ExitCode() != 0 {
+			log.Panicf("exit_code: %d\n", exitErr.ExitCode())
+		} else if !ok {
+			log.Panicln(err)
+		}
+	}
+	_ = mod
+}