const TextTheme({TextStyle display4, TextStyle display3, TextStyle display2, TextStyle display1, TextStyle headline, TextStyle title, TextStyle subhead, TextStyle body2, TextStyle body1, TextStyle caption, TextStyle button })

Create a text theme that uses the given values.

Rather than creating a new text theme, consider using Typography.black or Typography.white, which implement the typography styles in the material design specification:

material.google.com/style/typography.html#typography-styles

If you do decide to create your own text theme, consider using one of those predefined themes as a starting point for copyWith or apply.

Source 

const TextTheme({
  this.display4,
  this.display3,
  this.display2,
  this.display1,
  this.headline,
  this.title,
  this.subhead,
  this.body2,
  this.body1,
  this.caption,
  this.button
});