Single line text editor. 
When setting column editor, it will specify type as "line". If do not separately specify column editor, this editor object will be used.
    grid.setColumns([
        ...
    {
        fieldName: "fld0",
        editor: {
            type: "line",
            maxLength: 20
        },
        ...
    },
        ...
    ];
    
    // You can also directly specify in column level.
    column.setEditor({
        type: "line",
        maxLength: 20
    });