append mode

[purplecabbage]

it would be super useful if we could write to a file through the api in append mode, this would allow other use cases like very basic logging without having to read and re-write the entire file

    await files.append('my-static-app/users.log', 'created new user `${newUserId}`')

[aiojbot]

JIRA issue created: https://jira.corp.adobe.com/browse/ACNA-955

[moritzraho]

+1 we can read from a position + length but not write to a specific position

[PulkitChadhaAdobe]

Append mode would be useful for my use case to paralleling processing chunked files and saving the output from multiple workers into a single file.

[meryllblanchet]

@sarahxxu the enhancement could serve multiple use-cases as highlighted.

[sarahxxu]

+1