Status and Roadmap

Current state of development is tracked in GitHub projects.

High level status

• Most of TypeScript's AOT-compatible syntax is supported
• Manual memory management is in but GC remains to do
• Classes are still wonky when it comes to the details
• Standard library is very basic and needs a lot of work
• No exception support yet, waiting for WebAssembly/exception-handling to land
• We need more tests (pretty sure this will remain here)

High level goals

• Get a memory manager and GC combo up and running
  • Memory manager
  • GC
• Get a standard library up that "just works" (where AOT-compatible)
• Improve linking, e.g. with C, based on what's supported by common tools
• Compile the AssemblyScript compiler to WebAssembly using itself
• Provide tools to automatically generate glue code and definitions

And, of course, keep up with the state of WebAssembly, most notably at this point:

Proposal	Phase	Status
Sign Extension Operations	implementation	--feature sign-extension
Mutable Globals	implementation	--feature mutable-global
Non-trapping float-to-int Conversions	implementation
Reference Types	implementation
Multi-value	implementation
Bulk Memory Operations	implementation
Exception handling	proposal
Host Bindings	proposal
Threads	proposal
GC	proposal

Standard library compatibility

Feature		Notes
Globals
NaN	✓
Infinity	✓
isFinite	✓
isInteger
isNaN	✓
isSafeInteger
parseFloat	✓	Naive implementation
parseInt	✓
decoreURI
decoreURIComponent
encoreURI
encodeURIComponent
Number		There is no Number object in AssemblyScript, but one for each type instead.
EPSILON	✓
MIN_VALUE	✓
MAX_VALUE	✓
MIN_SAFE_INTEGER	✓
MAX_SAFE_INTEGER	✓
NaN	✓
NEGATIVE_INFINITY	✓
POSITIVE_INFINITY	✓
toExponential
toFixed
toLocaleString
toPrecision
toString
Array
length	✓
from
isArray
of
concat	✓
copyWithin
entries
every	✓
fill	✓
filter	✓
find
findIndex	✓
flat
flatMap
forEach	✓	No closures yet
includes	✓
indexOf	✓
join	✓
keys
lastIndexOf	✓
map	✓	No closures yet
pop	✓
push	✓
reduce	✓
reduceRight	✓
reverse	✓
shift	✓
slice	✓
some	✓
sort	✓
splice	✓
toLocaleString
toString	✓
unshift	✓
values
TypedArray
BYTES_PER_ELEMENT	✓
buffer	✓
byteLength	✓
byteOffset	✓
length	✓
from
of
copyWithin
entries
every
fill	✓
filter
find
findIndex
forEach
includes
indexOf
join
keys
lastIndexOf
map
reduce
reduceRight
reverse
set
slice
some
sort	✓
subarray	✓
toLocaleString
toString
values

ArrayBuffer

• #byteLength
• isView()
• #slice()
• #transfer()
• #toString()

DataView

• #buffer
• #byteLength
• #byteOffset
• #getInt8()
• #getUint8()
• #getInt16()
• #getUint16()
• #getInt32()
• #getUint32()
• #getInt64() ¹
• #getUint64() ¹
• #getFloat32()
• #getFloat64()
• #setInt8()
• #setUint8()
• #setInt16()
• #setUint16()
• #setInt32()
• #setUint32()
• #setInt64() ¹
• #setUint64() ¹
• #setFloat32()
• #setFloat64()
• #toString()

String

• #length
• fromCharCode()
• fromCharCodes() ¹
• fromCodePoint()
• fromCodePoints() ¹
• #charAt()
• #charCodeAt()
• #concat()
• #endsWith()
• #includes()
• #indexOf()
• #lastIndexOf()
• #localeCompare()
• #match()
• #normalize()
• #padEnd()
• #padStart()
• #repeat()
• #replace()
• #search()
• #slice()
• #split()
• #startsWith()
• #substr()
• #substring()
• #toLocaleLowerCase()
• #toLocaleUpperCase()
• #toLowerCase()
• #toUpperCase()
• #toString()
• #trim()
• #trimLeft()/#trimStart()
• #trimRight()/#trimEnd()
• #[Symbol.iterator]()
• raw()

Symbol

• #for()
• #keyFor()

Math/Mathf

• E
• LN10
• LN2
• LOG10E
• LOG2E
• PI
• SQRT1_2
• SQRT2
• abs()
• acos()
• acosh()
• asin()
• asinh()
• atan()
• atan2()
• atanh()
• cbrt()
• ceil()
• clz32()
• cos()
• cosh()
• exp()
• expm1()
• floor()
• fround()
• hypot()
• imul()
• log()
• log10()
• log1p()
• log2()
• max()
• min()
• pow()
• random()
• round()
• sign()
• sin()
• sinh()
• sqrt()
• tan()
• tanh()
• trunc()

Map

• #size
• #clear()
• #delete()
• #entries()
• #forEach()
• #get()
• #has()
• #set()
• #keys()
• #values()
• #toString()
• #[Symbol.iterator]()

Set

• #size
• #add()
• #clear()
• #delete()
• #entries()
• #forEach()
• #has()
• #values()
• #toString()
• #[Symbol.iterator]()

WeakMap

• #delete()
• #get()
• #has()
• #set()
• #toString()

WeakSet

• #add()
• #delete()
• #has()
• #toString()

console

• assert()
• clear()
• count()
• dir()
• error()
• group()
• groupCollapsed()
• groupEnd()
• info()
• log()
• table()
• time()
• timeEnd()
• trace()
• warn()

JSON

• parse()
• stringify()

Object

• is()
• keys()
• assign()
• create()
• entries()
• getOwnPropertyNames()
• getOwnPropertySymbols()
• #toString()

Date

• UTC
• now()
• parse()
• #getDate()
• #getDay()
• #getFullYear()
• #getHours()
• #getMilliseconds()
• #getMinutes()
• #getMonth()
• #getSeconds()
• #getTime()
• #getTimezoneOffset()
• #getUTCDate()
• #getUTCDay()
• #getUTCFullYear()
• #getUTCHours()
• #getUTCMilliseconds()
• #getUTCMinutes()
• #getUTCMonth()
• #getUTCSeconds()
• #setDate()
• #setFullYear()
• #setHours()
• #setMilliseconds()
• #setMinutes()
• #setMonth()
• #setSeconds()
• #setTime()
• #setUTCDate()
• #setUTCFullYear()
• #setUTCHours()
• #setUTCMilliseconds()
• #setUTCMinutes()
• #setUTCMonth()
• #setUTCSeconds()
• #toDateString()
• #toISOString()
• #toJSON()
• #toLocaleDateString()
• #toLocaleString()
• #toLocaleTimeString()
• #toString()
• #toTimeString()
• #toUTCString()

Error/RangeError/TypeError

• #message
• #stack
• #toString()

Promise

• all()
• race()
• reject()
• resolve()
• #catch()
• #finally()
• #then()

RegExp

• $1-$9
• input ($_)
• lastMatch ($&)
• lastParen ($+)
• lastIndex
• leftContext ($`)
• rightContext ($')
• #flags
• #global
• #ignoreCase
• #multiline
• #source
• #sticky
• #unicode
• #exec()
• #test()
• #toSource()
• #toString()
• #[Symbol.replace]()
• #[Symbol.search]()
• #[Symbol.split]()

BigInt

¹ AssemblyScript-specific
² Filler implementation present