js: codegen & vlib fixes, replace the Game of Life CLI example (#12272)

vlib/os/os.js.v

@@ -10,8 +10,10 @@ pub const (
 	args           = []string{}
 )
 
-$if js_node {
-	#$process.argv.forEach(function(val,index) { os__args.arr[index] = new string(val); })
+fn init() {
+	$if js_node {
+		#$process.argv.forEach(function(val,index) { os__args.arr[index] = new string(val); })
+	}
 }
 
 // real_path returns the full absolute path for fpath, with all relative ../../, symlinks and so on resolved.

vlib/rand/constants/constants.v

@@ -4,7 +4,7 @@ module constants
 pub const (
 	lower_mask     = u64(0x00000000FFFFFFFF)
 	max_u32        = 0xFFFFFFFF
-	max_u64        = 0xFFFFFFFFFFFFFFFF
+	max_u64        = u64(0xFFFFFFFFFFFFFFFF)
 	max_u32_as_f32 = f32(max_u32) + 1
 	max_u64_as_f64 = f64(max_u64) + 1
 	u31_mask       = u32(0x7FFFFFFF)

vlib/time/time.js.v

@@ -36,3 +36,9 @@ pub fn (t Time) local() Time {
 	// if it is not we should try to use Intl for getting local time.
 	return t
 }
+
+pub fn sleep(dur Duration) {
+	#let now = new Date().getTime()
+	#let toWait = BigInt(dur.val) / BigInt(time__millisecond)
+	#while (new Date().getTime() < now + Number(toWait)) {}
+}

vlib/v/gen/js/builtin_types.v

@@ -325,7 +325,7 @@ fn (mut g JsGen) gen_builtin_type_defs() {
 					typ_name: typ_name
 					default_value: 'new Number(0)'
 					// mask <=32 bit numbers with 0xffffffff
-					constructor: 'this.val = Number(val) & 0xffffffff'
+					constructor: 'this.val = Math.round(Number(val)) & 0xffffffff'
 					value_of: 'Number(this.val)'
 					to_string: 'this.valueOf().toString()'
 					eq: 'new bool(self.valueOf() === other.valueOf())'
@@ -359,7 +359,7 @@ fn (mut g JsGen) gen_builtin_type_defs() {
 				g.gen_builtin_prototype(
 					typ_name: typ_name
 					default_value: 'new Number(0)'
-					constructor: 'if (typeof(val) == "string") { this.val = val.charCodeAt() } else if (val instanceof string) { this.val = val.str.charCodeAt(); } else { this.val =  val | 0 }'
+					constructor: 'if (typeof(val) == "string") { this.val = val.charCodeAt() } else if (val instanceof string) { this.val = val.str.charCodeAt(); } else { this.val =  Math.round(val) }'
 					value_of: 'this.val | 0'
 					to_string: 'new string(this.val + "")'
 					eq: 'new bool(self.valueOf() === other.valueOf())'

vlib/v/gen/js/js.v

@@ -86,6 +86,7 @@ mut:
 	array_sort_fn          map[string]bool
 	wasm_export            map[string][]string
 	wasm_import            map[string][]string
+	init_global            map[string]map[string]ast.Expr // initializers for constants or globals, should be invoked before module init.
 }
 
 fn (mut g JsGen) write_tests_definitions() {
@@ -204,6 +205,11 @@ pub fn gen(files []&ast.File, table &ast.Table, pref &pref.Preferences) string {
 
 	for mod_name in g.table.modules {
 		g.writeln('// Initializations for module $mod_name')
+		for global, expr in g.init_global[mod_name] {
+			g.write('$global = ')
+			g.expr(expr)
+			g.writeln(';')
+		}
 		init_fn_name := '${mod_name}.init'
 		if initfn := g.table.find_fn(init_fn_name) {
 			if initfn.return_type == ast.void_type && initfn.params.len == 0 {
@@ -213,6 +219,7 @@ pub fn gen(files []&ast.File, table &ast.Table, pref &pref.Preferences) string {
 			}
 		}
 	}
+
 	if !g.pref.is_shared {
 		g.write('loadRoutine().then(_ => js_main());')
 	}
@@ -1214,7 +1221,7 @@ fn (mut g JsGen) gen_assert_stmt(orig_node ast.AssertStmt) {
 fn (mut g JsGen) gen_assign_stmt(stmt ast.AssignStmt, semicolon bool) {
 	if stmt.left.len > stmt.right.len {
 		// multi return
-		g.write('const [')
+		g.write('let [')
 		for i, left in stmt.left {
 			if !left.is_blank_ident() {
 				g.expr(left)
@@ -1469,8 +1476,17 @@ fn (mut g JsGen) gen_const_decl(it ast.ConstDecl) {
 		if field.is_pub {
 			g.push_pub_var(field.name)
 		}
-		g.write('const ${g.js_name(field.name)} = ')
-		g.expr(field.expr)
+
+		if field.expr is ast.StringInterLiteral || field.expr is ast.StringLiteral
+			|| field.expr is ast.IntegerLiteral || field.expr is ast.FloatLiteral
+			|| field.expr is ast.BoolLiteral {
+			g.write('const ${g.js_name(field.name)} = ')
+			g.expr(field.expr)
+		} else {
+			g.write('let ${g.js_name(field.name)} = ')
+			g.write('undefined')
+			g.init_global[g.ns.name][g.js_name(field.name)] = field.expr
+		}
 		g.writeln(';')
 	}
 	g.writeln('')