Use TypeScript and NCC

src/index.ts

@@ -0,0 +1,37 @@
+const core = require("@actions/core");
+const { execSync } = require("child_process");
+
+function runCommand(command: string): Buffer {
+    console.log(`Running command: ${command}`);
+    return execSync(command);
+}
+
+function main() {
+    const install = core.getInput("install");
+    const envVar = core.getInput("env-var");
+    const command = core.getInput("command");
+    const args = core.getInput("args");
+
+    if (install === "none") {
+        // No install.
+    } else if (install === "latest") {
+        runCommand("pip install dunamai");
+    } else {
+        runCommand(`pip install dunamai==${install}`);
+    }
+
+    const version = runCommand(`${command} ${args}`).toString();
+    core.setOutput("version", version);
+    console.log(`Dynamic version: ${version}`);
+
+    if (envVar !== "") {
+        console.log(`Setting environment variable: ${envVar}`);
+        core.exportVariable(envVar, version);
+    }
+}
+
+try {
+    main();
+} catch (error) {
+    core.setFailed(error.message);
+}