diff --git a/vlib/v/gen/js/js.v b/vlib/v/gen/js/js.v
index 8c3121a040..833a0fd595 100644
--- a/vlib/v/gen/js/js.v
+++ b/vlib/v/gen/js/js.v
@@ -1098,6 +1098,7 @@ fn (mut g JsGen) gen_assign_expr(it ast.AssignExpr) {
 		tmp_var := g.new_tmp_var()
 		g.write('const $tmp_var = ')
 		g.expr(it.val)
+		return
 	}
 
 	// NB: The expr has to go *before* inside_map_set as it's defined there
@@ -1326,10 +1327,9 @@ fn (mut g JsGen) gen_selector_expr(it ast.SelectorExpr) {
 }
 
 fn (mut g JsGen) gen_string_inter_literal(it ast.StringInterLiteral) {
-	// TODO Implement `tos3`
-	g.write('tos3(`')
+	g.write('`')
 	for i, val in it.vals {
-		escaped_val := val.replace_each(['`', '\`', '\r\n', '\n'])
+		escaped_val := val.replace('`', '\\`')
 		g.write(escaped_val)
 		if i >= it.exprs.len {
 			continue
@@ -1338,39 +1338,19 @@ fn (mut g JsGen) gen_string_inter_literal(it ast.StringInterLiteral) {
 		sfmt := it.expr_fmts[i]
 		g.write('\${')
 		if sfmt.len > 0 {
-			fspec := sfmt[sfmt.len - 1]
-			if fspec == `s` && it.expr_types[i] == table.string_type {
-				g.expr(expr)
-				g.write('.str')
-			} else {
-				g.expr(expr)
-			}
-		} else if it.expr_types[i] == table.string_type {
-			// `name.str`
+			// TODO: Handle formatting
 			g.expr(expr)
-			g.write('.str')
-		} else if it.expr_types[i] == table.bool_type {
-			// `expr ? "true" : "false"`
-			g.expr(expr)
-			g.write(' ? "true" : "false"')
 		} else {
 			sym := g.table.get_type_symbol(it.expr_types[i])
 
-			match sym.kind {
-				.struct_ {
-					g.expr(expr)
-					if sym.has_method('str') {
-						g.write('.str()')
-					}
-				}
-				else {
-					g.expr(expr)
-				}
+			g.expr(expr)
+			if sym.kind == .struct_ && sym.has_method('str') {
+				g.write('.str()')
 			}
 		}
 		g.write('}')
 	}
-	g.write('`)')
+	g.write('`')
 }
 
 fn (mut g JsGen) gen_struct_init(it ast.StructInit) {
diff --git a/vlib/v/gen/js/tests/interp.js b/vlib/v/gen/js/tests/interp.js
new file mode 100644
index 0000000000..e118984bd6
--- /dev/null
+++ b/vlib/v/gen/js/tests/interp.js
@@ -0,0 +1,260 @@
+// V_COMMIT_HASH 8a24d7d
+// V_CURRENT_COMMIT_HASH 123d788
+// Generated by the V compiler
+
+"use strict";
+
+/** @namespace builtin */
+const builtin = (function () {
+	/**
+	 * @function
+	 * @param {any} s
+	 * @returns {void}
+	*/
+	function println(s) {
+		console.log(s);
+	}
+	
+	/**
+	 * @function
+	 * @param {any} s
+	 * @returns {void}
+	*/
+	function print(s) {
+		process.stdout.write(s);
+	}
+
+	/* module exports */
+	return {
+		println,
+		print
+	};
+})();
+
+/** @namespace main */
+const main = (function () {
+	/**
+	 * @function
+	 * @param {string} s1
+	 * @param {string} s2
+	 * @returns {void}
+	*/
+	function test_fn(s1, s2) {
+		builtin.print((s1 === s2 ? "true" : "false"));
+		builtin.print("\t=> ");
+		builtin.println(`"${s1}", "${s2}"`);
+	}
+	
+	/**
+	 * @function
+	 * @returns {void}
+	*/
+	function simple_string_interpolation() {
+		/** @type {string} */
+		const a = "Hello";
+		/** @type {string} */
+		const b = "World";
+		/** @type {string} */
+		const res = `${a} ${b}`;
+		test_fn(res, "Hello World");
+	}
+	
+	/**
+	 * @function
+	 * @returns {void}
+	*/
+	function mixed_string_interpolation() {
+		/** @type {number} */
+		const num = 7;
+		/** @type {string} */
+		const str = "abc";
+		/** @type {string} */
+		const s1 = `number=${num}`;
+		test_fn(s1, "number=7");
+		/** @type {string} */
+		const s2 = `string=${str}`;
+		test_fn(s2, "string=abc");
+		/** @type {string} */
+		const s3 = `a: ${num} | b: ${str}`;
+		test_fn(s3, "a: 7 | b: abc");
+	}
+	
+	/**
+	 * @function
+	 * @returns {void}
+	*/
+	function formatted_string_interpolation() {
+		/** @type {string} */
+		const x = "abc";
+		/** @type {string} */
+		const axb = `a:${x}:b`;
+		test_fn(axb, "a:abc:b");
+		/** @type {string} */
+		const x_10 = `a:${x}:b`;
+		/** @type {string} */
+		const x10_ = `a:${x}:b`;
+		test_fn(x_10, "a:       abc:b");
+		test_fn(x10_, "a:abc       :b");
+		/** @type {number} */
+		const i = 23;
+		/** @type {string} */
+		const si_right = `${i}`;
+		/** @type {string} */
+		const si__left = `${i}`;
+		test_fn(si_right, "        23");
+		test_fn(si__left, "23        ");
+	}
+	
+	/**
+	 * @function
+	 * @returns {void}
+	*/
+	function implicit_str() {
+		/** @type {number} */
+		const i = 42;
+		test_fn(`int ${i}`, "int 42");
+		test_fn(`${i}`, "42");
+		/** @type {boolean} */
+		const check = `${i}` === "42";
+		/** @type {string} */
+		const text = `${i}` + "42";
+		test_fn(text, "4242");
+	}
+	
+	/**
+	 * @function
+	 * @returns {void}
+	*/
+	function string_interpolation_percent_escaping() {
+		/** @type {string} */
+		const test = "hello";
+		/** @type {string} */
+		const hello = "world";
+		/** @type {string} */
+		const x = `%.*s${hello}${test} |${hello}|`;
+		test_fn(x, "%.*sworldhello |world                         |");
+	}
+	
+	/**
+	 * @function
+	 * @returns {void}
+	*/
+	function string_interpolation_string_prefix() {
+		/** @type {string} */
+		const r = "r";
+		/** @type {string} */
+		const rr = `${r}${r}`;
+		test_fn(rr, "rr");
+		/** @type {string} */
+		const c = "c";
+		/** @type {string} */
+		const cc = `${c}${c}`;
+		test_fn(cc, "cc");
+		/** @type {string} */
+		const js = "js";
+		/** @type {string} */
+		const jsjs = `${js}${js}`;
+		test_fn(jsjs, "jsjs");
+	}
+	
+	/**
+	 * @function
+	 * @returns {void}
+	*/
+	function interpolation_string_prefix_expr() {
+		/** @type {number} */
+		const r = 1;
+		/** @type {number} */
+		const c = 2;
+		/** @type {number} */
+		const js = 1;
+		test_fn(`>${3 + r}<`, ">4<");
+		test_fn(`${r === js} ${js}`, "true 1");
+		test_fn(`>${js + c} ${js + r === c}<`, ">3 true<");
+	}
+	
+	/**
+	 * @function
+	 * @returns {void}
+	*/
+	function utf8_string_interpolation() {
+		/** @type {string} */
+		const a = "à-côté";
+		/** @type {string} */
+		const st = "Sträßle";
+		/** @type {string} */
+		const m = "10€";
+		test_fn(`${a} ${st} ${m}`, "à-côté Sträßle 10€");
+		/** @type {string} */
+		const zz = `>${a}< >${st}< >${m}<-`;
+		/** @type {string} */
+		const zz_expected = ">    à-côté< >Sträßle < >  10€<-";
+		test_fn(zz, zz_expected);
+		/** @type {string} */
+		const e = "€";
+		test_fn(`100.00 ${e}`, "100.00 €");
+		/** @type {string} */
+		const m2 = "Москва́";
+		/** @type {string} */
+		const d = "Antonín Dvořák";
+		test_fn(`:${m2}:${d}:`, ": Москва́:Antonín Dvořák :");
+		/** @type {string} */
+		const g = "Πελοπόννησος";
+		test_fn(`>${g}<`, ">Πελοπόννησος <");
+	}
+	
+	/**
+	 * @constructor
+	 * @param {{v1?: number, v2?: number}} init
+	*/
+	function Sss({ v1 = 0, v2 = 0 }) {
+		this.v1 = v1
+		this.v2 = v2
+	};
+	Sss.prototype = {
+		/** @type {number} */
+		v1: 0,
+		/** @type {number} */
+		v2: 0,
+		/**
+		 * @function
+		 * @returns {string}
+		*/
+		str() {
+			const s = this;
+			return `[${s.v1}, ${s.v2}]`;
+		}
+	};
+
+	
+	/**
+	 * @function
+	 * @returns {void}
+	*/
+	function string_interpolation_str_evaluation() {
+		/** @type {Sss} */
+		let x = new Sss({
+			v1: 17,
+			v2: 13.455893
+		});
+		test_fn(`${x.str()}`, "[17, 13.456]");
+	}
+	
+	/* program entry point */
+	(function() {
+		simple_string_interpolation();
+		mixed_string_interpolation();
+		formatted_string_interpolation();
+		implicit_str();
+		string_interpolation_percent_escaping();
+		string_interpolation_string_prefix();
+		interpolation_string_prefix_expr();
+		utf8_string_interpolation();
+		string_interpolation_str_evaluation();
+	})();
+
+	/* module exports */
+	return {};
+})();
+
+
diff --git a/vlib/v/gen/js/tests/interp.v b/vlib/v/gen/js/tests/interp.v
new file mode 100644
index 0000000000..b5f59bc3f4
--- /dev/null
+++ b/vlib/v/gen/js/tests/interp.v
@@ -0,0 +1,188 @@
+fn test_fn(s1, s2 string) {
+	print(if s1 == s2 {'true'} else {'false'})
+	print('\t=> ')
+	println('"$s1", "$s2"')
+}
+
+fn simple_string_interpolation() {
+	a := 'Hello'
+	b := 'World'
+	res := '$a $b'
+	test_fn(res, 'Hello World')
+}
+
+fn mixed_string_interpolation() {
+	num := 7
+	str := 'abc'
+	s1 := 'number=$num'
+	test_fn(s1, 'number=7')
+	s2 := 'string=$str'
+	test_fn(s2, 'string=abc')
+	s3 := 'a: $num | b: $str'
+	test_fn(s3, 'a: 7 | b: abc')
+}
+
+fn formatted_string_interpolation() {
+	x := 'abc'
+	axb := 'a:$x:b'
+	test_fn(axb, 'a:abc:b')
+	x_10 := 'a:${x:10s}:b'
+	x10_ := 'a:${x:-10s}:b'
+	test_fn(x_10, 'a:       abc:b')
+	test_fn(x10_, 'a:abc       :b')
+	i := 23
+	si_right := '${i:10d}'
+	si__left := '${i:-10d}'
+	test_fn(si_right, '        23')
+	test_fn(si__left, '23        ')
+}
+
+/*
+excape_dollar_in_string()
+fn excape_dollar_in_string() {
+	i := 42
+	test_fn('($i)', '(42)')
+	println('(\$i)'.contains('i') && !'(\$i)'.contains('42'))
+	println(!'(\\$i)'.contains('i') && '(\\$i)'.contains('42') && '(\\$i)'.contains('\\'))
+	println('(\\\$i)'.contains('i') && !'(\\\$i)'.contains('42') && '(\\$i)'.contains('\\'))
+	println(!'(\\\\$i)'.contains('i') && '(\\\\$i)'.contains('42') && '(\\\\$i)'.contains('\\\\'))
+	test_fn('(${i})', '(42)')
+	println('(\${i})'.contains('i') && !'(\${i})'.contains('42'))
+	println(!'(\\${i})'.contains('i') && '(\\${i})'.contains('42') && '(\\${i})'.contains('\\'))
+	println('(\\\${i})'.contains('i') && !'(\\\${i})'.contains('42') && '(\\${i})'.contains('\\'))
+	println(!'(\\\\${i})'.contains('i') && '(\\\\${i})'.contains('42') && '(\\\\${i})'.contains('\\\\'))
+	test_fn(i, 42)
+}
+*/
+
+fn implicit_str() {
+	i := 42
+	test_fn('int $i', 'int 42')
+	test_fn('$i', '42')
+	check := '$i' == '42'
+	//println(check)
+	text := '$i' + '42'
+	test_fn(text, '4242')
+}
+
+fn string_interpolation_percent_escaping() {
+	test := 'hello'
+	hello := 'world'
+	x := '%.*s$hello$test |${hello:-30s}|'
+	test_fn(x, '%.*sworldhello |world                         |')
+}
+
+fn string_interpolation_string_prefix() {
+	// `r`, `c` and `js` are also used as a string prefix.
+	r := 'r'
+	rr := '$r$r'
+	test_fn(rr, 'rr')
+	c := 'c'
+	cc := '$c$c'
+	test_fn(cc, 'cc')
+	js := 'js'
+	jsjs := '$js$js'
+	test_fn(jsjs, 'jsjs')
+}
+
+fn interpolation_string_prefix_expr() {
+	r := 1
+	c := 2
+	js := 1
+	test_fn('>${3+r}<', '>4<')
+	test_fn('${r == js} $js', 'true 1')
+	test_fn('>${js+c} ${js+r==c}<', '>3 true<')
+}
+
+/*
+inttypes_string_interpolation()
+fn inttypes_string_interpolation() {
+	c := i8(-103)
+	uc := byte(217)
+	uc2 := byte(13)
+	s := i16(-23456)
+	us := u16(54321)
+	i := -1622999040
+	ui := u32(3421958087)
+	vp := voidptr(ui)
+	bp := byteptr(15541149836)
+	l := i64(-7694555558525237396)
+	ul := u64(17234006112912956370)
+	test_fn('$s $us', '-23456 54321')
+	test_fn('$ui $i', '3421958087 -1622999040')
+	test_fn('$l $ul', '-7694555558525237396 17234006112912956370')
+	test_fn('>${s:11}:${us:-13}<', '>     -23456:54321        <')
+	test_fn('0x${ul:-19x}:${l:22d}', '0xef2b7d4001165bd2   :  -7694555558525237396')
+	test_fn('${c:5}${uc:-7}x', ' -103217    x')
+	test_fn('${c:x}:${uc:x}:${uc2:02X}', '99:d9:0D')
+	test_fn('${s:X}:${us:x}:${u16(uc):04x}', 'A460:d431:00d9')
+	test_fn('${i:x}:${ui:X}:${int(s):x}', '9f430000:CBF6EFC7:ffffa460')
+	test_fn('${l:x}:${ul:X}', '9537727cad98876c:EF2B7D4001165BD2')
+	// default pointer format is platform dependent, so try a few
+	println("platform pointer format: '${vp:p}:$bp'")
+	test_fn('${vp:p}:$bp', '0xcbf6efc7:0x39e53208c' ||
+		'${vp:p}:$bp' == 'CBF6EFC7:39E53208C' ||
+		'${vp:p}:$bp' == 'cbf6efc7:39e53208c' ||
+		'${vp:p}:$bp' == '00000000CBF6EFC7:000000039E53208C')
+}
+*/
+
+fn utf8_string_interpolation() {
+	a := 'à-côté'
+	st := 'Sträßle'
+	m := '10€'
+	test_fn('$a $st $m', 'à-côté Sträßle 10€')
+	zz := '>${a:10}< >${st:-8}< >${m:5}<-'
+	zz_expected := '>    à-côté< >Sträßle < >  10€<-'
+	//println('         zz: $zz')
+	//println('zz_expected: $zz_expected')
+	test_fn(zz, zz_expected)
+	// e := '\u20AC' // Eurosign doesn' work with MSVC and tcc
+	e := '€'
+	test_fn('100.00 $e', '100.00 €')
+	m2 := 'Москва́' // cyrillic а́: combination of U+0430 and U+0301, UTF-8: d0 b0 cc 81
+	d := 'Antonín Dvořák' // latin á: U+00E1, UTF-8: c3 a1
+	test_fn(':${m2:7}:${d:-15}:', ': Москва́:Antonín Dvořák :')
+	g := 'Πελοπόννησος'
+	test_fn('>${g:-13}<', '>Πελοπόννησος <')
+}
+
+struct Sss {
+	v1 int
+	v2 f64
+}
+
+fn (s Sss) str() string {
+	return '[${s.v1}, ${s.v2:.3f}]'
+}
+
+fn string_interpolation_str_evaluation() {
+	mut x := Sss{17, 13.455893}
+	test_fn('$x', '[17, 13.456]')
+}
+
+/*
+string_interpolation_with_negative_format_width_should_compile_and_run_without_segfaulting()
+fn string_interpolation_with_negative_format_width_should_compile_and_run_without_segfaulting() {
+	// discovered during debugging VLS
+	i := 3
+	input := '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}'
+	println('---------------------------------------------------------------------------------------------')
+	println('+60 ${i:10} | input.len: ${input.len:10} | ${input.bytes().hex():60} | $input')
+	println('-60 ${i:10} | input.len: ${input.len:10} | ${input.bytes().hex():-60} | $input')
+	println('---------------------------------------------------------------------------------------------')
+	println(true)
+}
+*/
+
+fn main() {
+	simple_string_interpolation()
+	mixed_string_interpolation()
+	formatted_string_interpolation()
+	implicit_str()
+	string_interpolation_percent_escaping()
+	string_interpolation_string_prefix()
+	interpolation_string_prefix_expr()
+	utf8_string_interpolation()
+	string_interpolation_str_evaluation()
+}
\ No newline at end of file
diff --git a/vlib/v/gen/js/tests/js.js b/vlib/v/gen/js/tests/js.js
index ef2c001925..1cd2ab78a8 100644
--- a/vlib/v/gen/js/tests/js.js
+++ b/vlib/v/gen/js/tests/js.js
@@ -1,5 +1,5 @@
-// V_COMMIT_HASH 808975f
-// V_CURRENT_COMMIT_HASH 564545d
+// V_COMMIT_HASH 8a24d7d
+// V_CURRENT_COMMIT_HASH 123d788
 // Generated by the V compiler
 
 "use strict";
@@ -214,10 +214,10 @@ const main = (function (hl) {
 		/** @type {string} */
 		const v_debugger = "JS keywords";
 		/** @type {string} */
-		const v_await = v_super + ": " + v_debugger;
+		const v_await = `${v_super}: ${v_debugger}`;
 		/** @type {string} */
 		let v_finally = "implemented";
-		console.log(v_await, v_finally);
+		builtin.println(`${v_await} ${v_finally}`);
 		/** @type {number} */
 		const dun = i_am_a_const * 20;
 		/** @type {string} */
@@ -226,7 +226,7 @@ const main = (function (hl) {
 		}
 		
 		for (let i = 0; i < "hello".length; ++i) {
-			let x = "hello"[i];
+			const x = "hello"[i];
 		}
 		
 		for (let x = 1; x < 10; ++x) {
@@ -235,7 +235,7 @@ const main = (function (hl) {
 		/** @type {number[]} */
 		const arr = [1, 2, 3, 4, 5];
 		for (let _tmp6 = 0; _tmp6 < arr.length; ++_tmp6) {
-			let i = arr[_tmp6];
+			const i = arr[_tmp6];
 		}
 		
 		/** @type {Map<string, string>} */
@@ -255,7 +255,7 @@ const main = (function (hl) {
 		
 		/** @type {(number: number) => void} */
 		const fn_in_var = function (number) {
-			builtin.println(tos3(`number: ${number}`));
+			builtin.println(`number: ${number}`);
 		};
 		hl.v_debugger();
 		anon_consumer(hl.excited(), function (message) {
@@ -294,7 +294,7 @@ const main = (function (hl) {
 	*/
 	function hello(game_on, ...dummy) {
 		for (let _tmp7 = 0; _tmp7 < dummy.length; ++_tmp7) {
-			let dd = dummy[_tmp7];
+			const dd = dummy[_tmp7];
 			/** @type {string} */
 			const l = dd;
 		}
diff --git a/vlib/v/gen/js/tests/js.v b/vlib/v/gen/js/tests/js.v
index 07b7ac3eff..6ee557034f 100644
--- a/vlib/v/gen/js/tests/js.v
+++ b/vlib/v/gen/js/tests/js.v
@@ -47,7 +47,7 @@ fn main() {
     c.a.update('another update')
     println(c)
 
-    _ := "done"
+    _ = "done"
     {
         _ = "block"
     }
@@ -57,10 +57,10 @@ fn main() {
 
     debugger := 'JS keywords'
     // TODO: Implement interpolation
-    await := super + ': ' + debugger
+    await := '$super: $debugger'
     mut finally := 'implemented'
 
-    JS.console.log(await, finally)
+    println('$await $finally')
 
     dun := i_am_a_const * 20
     dunn := hl.hello // External constant