feature_list.md

Wasmnizer-ts feature list

Table column definition:

• feature TypeScript keyword/type/syntax/concepts

• WAMR Whether this feature is supported on WebAssembly Micro Runtime (WAMR)

• chrome Whether this feature is supported on chrome browser

• popularity The frequency of the feature used in TypeScript.

  • empty means less used, or not evaluated
  • ⭐ means frequently used by experienced TypeScript developers
  • ⭐⭐ means frequently used by both experienced and begging TypeScript developers

Primitives

feature	WAMR	chrome	popularity
boolean	✔️	✔️	⭐⭐
number	✔️	✔️	⭐⭐
string	✔️	✔️	⭐⭐
string template	✔️	✔️	⭐⭐
bigint	❌	❌
symbol	❌	❌

Class

feature	WAMR	chrome	popularity
declaration	✔️	✔️	⭐⭐
inherit	✔️	✔️	⭐⭐
method overwrite	✔️	✔️	⭐⭐
static field/method	✔️	✔️	⭐⭐
field initializer	✔️	✔️	⭐⭐
visibility control	✔️	✔️	⭐⭐
getter/setter	✔️	✔️
class as value	❌	❌

Function

feature	WAMR	chrome	popularity
closure	✔️	✔️	⭐⭐
optional parameter	✔️	✔️	⭐⭐
function default parameter	✔️	✔️	⭐⭐
method default parameter	✔️	✔️	⭐⭐
closure default parameter	❌	❌
destructor parameter	❌	❌	⭐⭐
rest parameter	✔️	✔️	⭐
this binding	❌	❌	⭐
overload	❌	❌	⭐

Interface

feature	WAMR	chrome	popularity
explicitly implemented interface	✔️	✔️	⭐⭐
implicitly implemented interface	✔️	❌	⭐⭐
readonly fields	✔️	❌
function signature	❌	❌
indexed signature	❌	❌

Enum

feature	WAMR	chrome	popularity
numeric enum	✔️	✔️	⭐⭐
string enum	✔️	✔️	⭐⭐
heterogeneous enum	❌	❌

Built-in objects/method

feature	WAMR	chrome	popularity	note
console	✔️	❌	⭐⭐	only support log
Object	❌	❌	⭐
Function	❌	❌
JSON	✔️	❌	⭐⭐	fallback to dynamic
Date	✔️	❌	⭐⭐	fallback to dynamic
Math	✔️	✔️	⭐⭐	only support pow, max, min, sqrt, abs, ceil, floor
Number	❌	❌	⭐⭐
String	✔️	✔️	⭐⭐
Array	✔️	❌	⭐⭐
Map	✔️	❌	⭐⭐	fallback to dynamic
Set	✔️	❌	⭐	fallback to dynamic
ArrayBuffer	❌	❌	⭐
RegExp	❌	❌	⭐
... others	❌	❌

Wasm runtime capabilities

feature	WAMR	chrome	popularity	note
exception handling	❌	✔️	⭐⭐
promise	✔️	❌	⭐⭐	fallback to dynamic
source debugging	❌	✔️	⭐⭐
AoT compilation	❌	❌
async/await	❌	❌	⭐⭐
import host API	✔️	✔️		import host API

Dynamics

feature	WAMR	chrome	popularity	note
any	✔️	✔️	⭐
unknown	❌	❌
never	❌	❌
assign static to any	✔️	✔️
assign any to static	✔️	✔️
property access	✔️	✔️	⭐⭐
prototype	✔️	✔️	⭐
comparison	✔️	❌	⭐
arithmetic operation	✔️	✔️	⭐⭐	only support number and string
mixed type	✔️	❌		Box static object to any and add new property on it
dynamic function	❌	❌
eval	❌	❌

Type casting

feature	WAMR	chrome	popularity	note
static to static	✔️	✔️		static type checking
static to dynamic	✔️	✔️		always success
dynamic to static	✔️	✔️		runtime type checking
dynamic to dynamic	✔️	✔️		no check

Misc

feature	WAMR	chrome	popularity	note
typeof	✔️	❌	⭐
instanceof	✔️	✔️	⭐
toString	✔️	❌	⭐⭐
for ... of	✔️	✔️	⭐⭐
for ... in	❌	❌	⭐⭐
generic	❌	❌
module (static import)	✔️	✔️	⭐⭐
module (dynamic import)	❌	❌