Deprecated classes

[organicnz]

How could I fix these deprecations, guys?

For example TextButton highlights shape and color properties in VScode.

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      width: double.infinity,
      height: getProportionateScreenHeight(56),
      child: TextButton(
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
        color: kPrimaryColor,
        onPressed: press,
        child: Text(
          text,
          style: TextStyle(
            fontSize: getProportionateScreenWidth(18),
            color: Colors.white,
          ),
        ),
      ),
    );
  }

flutter analyze

Analyzing E-commerce-Complete-Flutter-UI...                             

   info • 'FlatButton' is deprecated and shouldn't be used. Use TextButton
          instead. See the migration guide in
          flutter.dev/go/material-button-migration-guide). This feature
          was deprecated after v1.25.0-8.1.pre. •
          lib/components/default_button.dart:20:14 • deprecated_member_use
   info • 'FlatButton' is deprecated and shouldn't be used. Use TextButton
          instead. See the migration guide in
          flutter.dev/go/material-button-migration-guide). This feature
          was deprecated after v1.25.0-8.1.pre. •
          lib/components/rounded_icon_btn.dart:33:14 •
          deprecated_member_use
   info • Unused import:
          'package:shop_app/screens/profile/profile_screen.dart' •
          lib/main.dart:3:8 • unused_import
   info • Duplicate import • lib/models/Cart.dart:4:8 • duplicate_import
   info • 'FlatButton' is deprecated and shouldn't be used. Use TextButton
          instead. See the migration guide in
          flutter.dev/go/material-button-migration-guide). This feature
          was deprecated after v1.25.0-8.1.pre. •
          lib/screens/details/components/custom_app_bar.dart:26:22 •
          deprecated_member_use
   info • 'overflow' is deprecated and shouldn't be used. Use clipBehavior
          instead. See the migration guide in
          flutter.dev/go/clip-behavior. This feature was deprecated after
          v1.22.0-12.0.pre. •
          lib/screens/home/components/icon_btn_with_counter.dart:25:9 •
          deprecated_member_use
   info • 'Overflow' is deprecated and shouldn't be used. Use clipBehavior
          instead. See the migration guide in
          flutter.dev/go/clip-behavior. This feature was deprecated after
          v1.22.0-12.0.pre. •
          lib/screens/home/components/icon_btn_with_counter.dart:25:19 •
          deprecated_member_use
   info • 'FlatButton' is deprecated and shouldn't be used. Use TextButton
          instead. See the migration guide in
          flutter.dev/go/material-button-migration-guide). This feature
          was deprecated after v1.25.0-8.1.pre. •
          lib/screens/profile/components/profile_menu.dart:21:14 •
          deprecated_member_use
   info • 'overflow' is deprecated and shouldn't be used. Use clipBehavior
          instead. See the migration guide in
          flutter.dev/go/clip-behavior. This feature was deprecated after
          v1.22.0-12.0.pre. •
          lib/screens/profile/components/profile_pic.dart:16:9 •
          deprecated_member_use
   info • 'Overflow' is deprecated and shouldn't be used. Use clipBehavior
          instead. See the migration guide in
          flutter.dev/go/clip-behavior. This feature was deprecated after
          v1.22.0-12.0.pre. •
          lib/screens/profile/components/profile_pic.dart:16:19 •
          deprecated_member_use
   info • 'FlatButton' is deprecated and shouldn't be used. Use TextButton
          instead. See the migration guide in
          flutter.dev/go/material-button-migration-guide). This feature
          was deprecated after v1.25.0-8.1.pre. •
          lib/screens/profile/components/profile_pic.dart:27:22 •
          deprecated_member_use
   info • Name non-constant identifiers using lowerCamelCase •
          lib/screens/sign_up/components/sign_up_form.dart:20:10 •
          non_constant_identifier_names

12 issues found. (ran in 2.5s)