Code Style. Dart

Tabs and Indents

Item	Description
Use tab character	If this check box is selected, tab characters are used: On pressing the TabTabTabTabTabTabTabTabTabTabTab key For indentation For code reformatting When the check box is cleared, WebStorm uses spaces instead of tabs.
Smart tabs	If this check box is selected, WebStorm inserts tabs for indentation and reformatting, but fine alignment to a necessary column is done only via spaces without replacing them with tabs. This is done in order to preserve visual representation of the source code, when the Tab Size is changed. If this check box is cleared, only tabs are used. This means that a group of spaces that fits the specified tab size is automatically replaced with a tab, which may result in breaking fine alignment. The Smart Tabs check box is available if the Use Tab Character check box is selected.
Tab size	In this text box, specify the number of spaces included in a tab.
Indent	In this text box, specify the number of spaces (or tabs if the Use Tab Character check box is selected) to be inserted for each indent level.
Continuation indent	In this text box, specify the number of spaces (or tabs if the Use Tab Character check box is selected) to be inserted at the next line in case of a construct break.

Spaces

Use this tab to specify where you want spaces in your code. To have WebStorm automatically insert a space at a location, select the check box next to this location in the list. The results are displayed in the Preview pane.

Wrapping and Braces

In this tab, customize the code style options, which WebStorm will apply on reformatting the source code. The left-hand pane contains the list of exceptions (Keep when reformatting), and placement and alignment options for the various code constructs (lists, statements, operations, annotations, etc.). The right-hand pane shows preview.

Keep when reformatting

Use the check boxes to configure exceptions that WebStorm will make when reformatting the source code.

Blank lines

Use this tab to define where and how many blank lines you want WebStorm to retain and insert in your code after reformatting. For each type of location, specify the number of blank lines to be inserted. The results are displayed in the Preview pane.

Item	Description
Keep Maximum Blank Lines	In this area, specify the number of blank lines to be kept after reformatting in the specified locations.