src/vs/workbench/contrib/terminal/browser/terminalTypeAheadAddon.ts/TypeAheadStyle/onUpdate
class TypeAheadStyle:	onUpdate(style: ITerminalConfiguration['localEchoStyle']) {
		const { applyArgs, undoArgs } = this._getArgs(style);
		this._applyArgs = applyArgs;
		this._undoArgs = this._originalUndoArgs = undoArgs;
		this.apply = TypeAheadStyle._compileArgs(this._applyArgs);
		this.undo = TypeAheadStyle._compileArgs(this._undoArgs);
	}