editSong - Chart specification

const editSong: (song, edit) => SongDocument = editSongWithRawAdditions;

Applies a batch of edits to a song’s chart and song.ini and returns the edited song, leaving song unchanged: the earlier document is the undo step. Every byte the edits don’t touch is kept, and an empty batch returns song. Throws if an edit doesn’t fit the chart’s format, such as a length on a .chart text event.

Parameters

Parameter	Type
`song`	`SongDocument`
`edit`	(`batch`) => `void`

Returns