feat: version to print v8 version

Author: Jan Krems

lib/internal/inspect-repl.js

@@ -192,7 +192,7 @@ function aliasProperties(target, mapping) {
 }
 
 function createRepl(inspector) {
-  const { Debugger } = inspector;
+  const { Debugger, Runtime } = inspector;
 
   let repl; // eslint-disable-line prefer-const
   let lastCommand;
@@ -583,6 +583,16 @@ function createRepl(inspector) {
         watchedExpressions.splice(index !== -1 ? index : +expr, 1);
       },
 
+      get version() {
+        return Runtime.evaluate({
+          expression: 'process.versions.v8',
+          contextId: 1,
+          returnByValue: true,
+        }).then(({ result }) => {
+          print(result.value);
+        });
+      },
+
       scripts: listScripts,
       setBreakpoint,
       clearBreakpoint,

test/cli/launch.test.js

@@ -18,6 +18,10 @@ test('examples/empty.js', (t) => {
     .then(() => {
       t.match(cli.output, 'hello world', 'repeats the last command on <enter>');
     })
+    .then(() => cli.command('version'))
+    .then(() => {
+      t.match(cli.output, process.versions.v8, 'version prints the v8 version');
+    })
     .then(() => cli.quit())
     .then((code) => {
       t.equal(code, 0, 'exits with success');