Documentation of this library should be auto-generated with TypeDoc, this PR ethereumjs/ethereumjs-util#170 can serve as a reference (see also technical docs on documentation).

For this the manual documentation comments in the README (https://github.com/ethereumjs/ethereumjs-account) should be integrated in the code along the way.

Only functionality in index.ts is currently part of the external API and should be publicly exposed (so roughly the currently documented functions, apart from eventually some updates from recent changes or functionality additions).