Thanks for your PR! 🎉

Ace Editor code looks good.
Regarding Tabs I have some comments.

1. Let's keep typings close to the components and remove typings.ts file.

2. type ITabListItemDefaultProps = Readonly<typeof styledTabListItemDefaultProps>; is not needed. Could you move default props back to Tabs.tsx?

3. We try to stick to the convention of not prefixing interfaces with I.

4. We need to provide more exhaustive typings for Tabs and StyledTabs.

Right now Tabs accepts tabsData and [propsName: string]: any;. Let's narrow this type. It should accept tabsData, all style props accepted by StyledTab and all HTML div element attributes.

In order to have this, we should do the following:

• Crate component Box and interface BoxProps in Tabs.ts. Another PR adds it to the separate folder, but as it's not yet merged, we can keep it Tabs.ts file.

interface BoxProps extends Omit<React.ComponentPropsWithRef<'div'>, 'color'> {}
const Box = ('div' as any) as React.FC<BoxProps>;

We are doing this because styled-components and TypeScript doesn't work well together, and there are some type conflicts (the type of prop color from styled-system conflicts with div element's color.)

• Create an interface StyledTabOwnProps:

export interface StyledTabOwnProps
  extends ColorProps,
    BorderProps,
    FlexboxProps,
    TypographyProps,
    LayoutProps,
    SpaceProps,
    ShadowProps {}

All the types used here are imported from styled-system.

• Use Box and StyledTabOwnProps to declare StyledTab:

const StyledTab = styled(Box)<StyledTabOwnProps>`
  ${color}
  ${border}
  ${typography}
  ${layout}
  ${space}
  ${shadow}
`;

• Export interface StyledTabProps that extends both tab's own props (styled) and HTML div element attributes.

export interface StyledTabProps extends StyledTabOwnProps, BoxProps {}

• Use newly created interface to declare TabsProps in index.ts:

export interface TabsProps extends StyledTabProps {
  tabsData: Array<{
    title: string;
    tabContent: any;
  }>;
}

export const Tabs: React.FC<TabsProps> = props => { ...