The vast majority of these are for APIs that have been around forever and no modern project would need to polyfill. A couple of these may be for newer APIs, but even then it's much better to let your build system add the polyfill rather than adding the polyfill for every single user of the library when most won't need it.
array.prototype.findlast
array.prototype.tosorted
array.prototype.findlastindex
array.prototype.grouptomap
array.prototype.toreversed
array.prototype.tospliced
array.prototype.with
arraybuffer.prototype.detached
arraybuffer.prototype.transfer
arraybuffer.prototype.transfertofixedlength
asynciterator.prototype
document.contains
function.prototype.name
iterator.prototype
set.prototype.difference
set.prototype.intersection
set.prototype.isdisjointfrom
set.prototype.issubsetof
set.prototype.issupersetof
set.prototype.symmetricdifference
set.prototype.union
string.prototype.iswellformed
string.prototype.padleft
string.prototype.padright
string.prototype.replaceall
string.prototype.split
string.prototype.substr
map.groupby
object.groupby
promise.withresolvers
reflect.getprototypeof
reflect.ownkeys
symbol.prototype.description
typedarray.prototype.slice
util.promisify
airbnb-browser-shims
airbnb-js-shims
array-buffer-byte-length
data-view-buffer
data-view-byte-length
data-view-byte-offset
call-bind
define-accessor-property
define-data-property
disposablestack
error-cause
es-abstract
es-array-method-boxes-properly
es-arraybuffer-base64
es-constants
es-create-array-iterator
es-define-property
es-errors
es-get-iterator
es-iterator-helpers
es-object-atoms
es-set-tostringtag
es-shim-unscopables
es-string-html-methods
es-to-primitive
es7-shim
functions-have-names
get-symbol-description
globalthis
gopd
intl-fallback-symbol
iterate-iterator
iterate-value
make-async-function
parseint
suppressed-error
typed-array-buffer
typed-array-byte-length
typed-array-byte-offset
typed-array-length
validate-exports-object
well-known-symbols
The vast majority of these are for APIs that have been around forever and no modern project would need to polyfill. A couple of these may be for newer APIs, but even then it's much better to let your build system add the polyfill rather than adding the polyfill for every single user of the library when most won't need it.
array.prototype.findlast
array.prototype.tosorted
array.prototype.findlastindex
array.prototype.grouptomap
array.prototype.toreversed
array.prototype.tospliced
array.prototype.with
arraybuffer.prototype.detached
arraybuffer.prototype.transfer
arraybuffer.prototype.transfertofixedlength
asynciterator.prototype
document.contains
function.prototype.name
iterator.prototype
set.prototype.difference
set.prototype.intersection
set.prototype.isdisjointfrom
set.prototype.issubsetof
set.prototype.issupersetof
set.prototype.symmetricdifference
set.prototype.union
string.prototype.iswellformed
string.prototype.padleft
string.prototype.padright
string.prototype.replaceall
string.prototype.split
string.prototype.substr
map.groupby
object.groupby
promise.withresolvers
reflect.getprototypeof
reflect.ownkeys
symbol.prototype.description
typedarray.prototype.slice
util.promisify
airbnb-browser-shims
airbnb-js-shims
array-buffer-byte-length
data-view-buffer
data-view-byte-length
data-view-byte-offset
call-bind
define-accessor-property
define-data-property
disposablestack
error-cause
es-abstract
es-array-method-boxes-properly
es-arraybuffer-base64
es-constants
es-create-array-iterator
es-define-property
es-errors
es-get-iterator
es-iterator-helpers
es-object-atoms
es-set-tostringtag
es-shim-unscopables
es-string-html-methods
es-to-primitive
es7-shim
functions-have-names
get-symbol-description
globalthis
gopd
intl-fallback-symbol
iterate-iterator
iterate-value
make-async-function
parseint
suppressed-error
typed-array-buffer
typed-array-byte-length
typed-array-byte-offset
typed-array-length
validate-exports-object
well-known-symbols