nl_tokens: Turns an IPC channel into an Observable
pl_tokens: function listenToIpc ( channel ) { return Observable . create ( ( subj ) => { let listener = ( event , ... args ) => { d ( ` ${ channel } ${ JSON . stringify ( args ) } ` ) ; subj . next ( args ) ; } ; d ( ` ${ <mask> } ` ) ; ipc . on ( channel , listener ) ; return new Subscription ( ( ) => ipc . removeListener ( channel , listener ) ) ; } ) ; }