Int64 and Uint64 methods and types are not supported in Dart2JS's typeddata

[vsmenon]

ByteData.[getInt64/setInt64/getUint64/setUint64] all throw unsupported exceptions in Dart2JS (they work in the VM).

Similarly, Int64List and Uint64List fail on construction.

It's not clear how to expose this in a way that works on Dart2JS. The only 64-bit int type we have is fixnum:int64, but that does not subtype num or int. We have no unsigned 64-bit int type for dart2js.

E.g., here's a signature:

abstract int getUint64(int byteOffset, [Endianness endian = Endianness.BIG_ENDIAN])

If we implement this in Dart2JS, what should the return type be?

[vsmenon]

Issue #10254 has been merged into this issue.

[lrhn]

In my opinion, they should throw UnimplementedError.

This can't be implemented correctly in dart2js without proper 64-bit integers, so it is really blocked on issue #1533.

[vsmenon]

Blocking on 1533 as Lasse suggests.

Note, current behavior is UnsupportedError as we cannot correctly implement it today, and it's not clear yet whether 1533 will be resolved in a way that lets us correctly implement it as is (given the current API).

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Marked this as being blocked by #1533.

[kasperl]

Added this to the Later milestone.

[kasperl]

Added TriageForM5 label.

[kasperl]

Removed TriageForM5 label.

[kasperl]

Removed this from the Later milestone.
Added Oldschool-Milestone-Later label.

[kasperl]

Removed Oldschool-Milestone-Later label.

[Bluenuance]

what is the state of the issue
it says it is blocked because of #1533 but this issue is closed

[sigmundch]

Thanks for following up @Bluenuance!

For the same reason we closed #1533, we won't be able to provide the 64-bit variants in typeddata from dart2js.

I'll shortly close this issue as well, since we currently have no plans to change the current behavior.

[fawdlstty]

Hello everyone. Is there a new plan for this issue? This problem continues to affect developers.

[lrhn]

There is no known plan for allowing Uint64List/Int64List on the web, because there is no 64-bit integer values, so int operator[](int index) would not be able to return the values of a 64-bit integer list.

If the web version of Uint64List could return a BigInt, then it would be useful, but it wouldn't match the Dart type system since a JavaScript BigInt is not compatible with an int represented as a JavaScript Number.