v.gen.js: add source map creation support (inline only, no src) (#10384)

vlib/builtin/js/jsfns.js.v

@@ -21,6 +21,15 @@ pub struct JS.Array {
 
 pub struct JS.Map {}
 
+// browser: https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Error
+// node: https://nodejs.org/api/errors.html#errors_class_error
+pub struct JS.Error {
+pub:
+	name    string
+	message string
+	stack   string
+}
+
 // Type prototype functions
 fn (v JS.String) toString() JS.String
 fn (v JS.Number) toString() JS.String

vlib/builtin/js/jsfns_node.js.v

@@ -7,6 +7,23 @@
 
 module builtin
 
+pub struct JS.node_process {
+pub:
+	arch     string
+	argsv    []string
+	env      []string
+	platform string
+	version  string
+	// TODO: add all properties
+}
+
+// hack to access  process properties
+pub fn js_node_process() JS.node_process {
+	#return process
+
+	return JS.node_process{}
+}
+
 fn JS.process.exit(int)
 fn JS.process.stdout.write(string) bool
 fn JS.process.stdout.writeln(string) bool