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Built-in Objects and Functions

The built-in objects are special. We can call a function, like Object.getOwnPropertyDescriptor(), but not the Object or the function.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects

Some of the JS built-in objects and functions are "not allowed" in FS. It means, an FS compiler rejects code that contains "not allowed" objects and functions.

Object

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object

Function side-effect
assign mutate
create creates a special prototype
defineProperties mutate
defineProperty mutate
entries no
freeze mutate
fromEntries no
getOwnPropertyDescriptor no
getOwnPropertyDescriptors no
getOwnPropertyNames no
getOwnPropertySymbols return symbols
getPrototypeOf return prototypes
groupBy return null-property object
hasOwn no
is no
isExtensible no
isFrozen no
isSealed no
keys no
preventExtensions mutate
seal mutate
setPrototypeOf mutate
values no

Array

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array

Function side-effect
from no
fromAsync ?
isArray no
of no

BigInt

Function side-effect
asIntN no
asUintN no

JSON

Function side-effects
isRawJSON no
parse no
rawJSON no
stringify no

Others

Function side-effect
decodeURI() no
decodeURIComponent() no
encodeURI() no
encodeURIComponent() no
eval() no
Property side-effect
Infinity no
isFinite() no
isNaN() no
NaN no