Jco transpile: implementation of wasi-filesystem for Node.js

[yoshuawuyts]

Tasks

• preopens.get-directories
• types.descriptor.read-via-stream
• types.descriptor.write-via-stream
• types.descriptor.append-via-stream
• types.descriptor.advise
• types.descriptor.sync-data
• types.descriptor.get-flags
• types.descriptor.get-type
• types.descriptor.set-size
• types.descriptor.set-times
• types.descriptor.read
• types.descriptor.write
• types.descriptor.read-directory
• types.descriptor.sync
• types.descriptor.create-directory-at
• types.descriptor.stat
• types.descriptor.stat-at
• types.descriptor.set-times-at
• types.descriptor.link-at
• types.descriptor.open-at
• types.descriptor.readlink-at
• types.descriptor.remove-directory-at
• types.descriptor.rename-at
• types.descriptor.symlink-at
• types.descriptor.access-at
• types.descriptor.unlink-file-at
• types.descriptor.is-same-object
• types.descriptor.metadata-hash
• types.descriptor.metadata-hash-at
• types.directory-entry-stream.read-directory-entry
• types.filesystem-error-code

Conformance Tests

• api_read_only
• cli_directory_list
• cli_file_append
• cli_file_dir_sync
• cli_file_read
• preview1_close_preopen
• preview1_dangling_fd
• preview1_dangling_symlink
• preview1_dir_fd_op_failures
• preview1_directory_seek
• preview1_fd_advise
• preview1_fd_filestat_get
• preview1_fd_filestat_set
• preview1_fd_flags_set
• preview1_fd_readdir
• preview1_file_allocate
• preview1_file_pread_pwrite
• preview1_file_seek_tell
• preview1_file_truncation
• preview1_file_unbuffered_write
• preview1_interesting_paths
• preview1_nofollow_errors
• preview1_overwrite_preopen
• preview1_path_exists
• preview1_path_filestat
• preview1_path_link
• preview1_path_open_create_existing
• preview1_path_open_dirfd_not_dir
• preview1_path_open_missing
• preview1_path_open_nonblock
• preview1_path_open_preopen
• preview1_path_open_read_write
• preview1_path_rename
• preview1_path_rename_dir_trailing_slashes
• preview1_path_rename_file_trailing_slashes
• preview1_path_symlink_trailing_slashes
• preview1_poll_oneoff_files
• preview1_readlink
• preview1_regular_file_isatty
• preview1_remove_directory_trailing_slashes
• preview1_remove_nonempty_directory
• preview1_renumber
• preview1_symlink_create
• preview1_symlink_filestat
• preview1_symlink_loop
• preview1_unlink_file_trailing_slashes

[yoshuawuyts]

To implement the lock functions, we can probably (re)-use https://www.npmjs.com/package/fd-lock

[manekinekko]

Looks like lock methods have been removed from Preview 2 for now.

[yoshuawuyts]

From today's sync meeting: once #244 this should mostly be an exercise in checkboxes. Implement a function, write a test, check in.