[v6] Remove @rjsf/material-ui theme (Material UI v4) (#4010)

Author: nickgros

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -26,7 +26,6 @@ body:
         - antd
         - chakra-ui
         - fluent-ui
-        - material-ui
         - mui
         - react-bootstrap
         - semantic-ui

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -20,7 +20,6 @@ body:
         - antd
         - chakra-ui
         - fluent-ui
-        - material-ui
         - mui
         - react-bootstrap
         - semantic-ui

.github/ISSUE_TEMPLATE/question_issue.yml

@@ -20,7 +20,6 @@ body:
         - antd
         - chakra-ui
         - fluent-ui
-        - material-ui
         - mui
         - react-bootstrap
         - semantic-ui

CHANGELOG.md

@@ -21,6 +21,10 @@ should change the heading of the (upcoming) version to include a major version b
 
 - Package has been replaced with `@rjsf/react-bootstrap`. `react-boostrap` v1 / Bootstrap 4 are no longer supported in RJSF v6.
 
+## @rjsf/material-ui
+
+- Removed `@rjsf/material-ui` package. Material UI v4 (`@material-ui/core`) has been deprecated since September 2021. To use Material UI v5 (`@mui/core`) with RJSF, please use the `@rjsf/mui` theme instead.
+
 ## @rjsf/react-bootstrap
 
 - Added new package to replace `@rjsf/bootstrap-4`

README.md

@@ -33,7 +33,6 @@
 - [Chakra UI](https://github.com/rjsf-team/react-jsonschema-form/tree/main/packages/chakra-ui)
 - [Fluent UI](https://github.com/rjsf-team/react-jsonschema-form/tree/main/packages/fluent-ui)
 - [Fluent UI 9](https://github.com/rjsf-team/react-jsonschema-form/tree/main/packages/fluentui-rc)
-- [Material UI 4](https://github.com/rjsf-team/react-jsonschema-form/tree/main/packages/material-ui)
 - [Material UI 5](https://github.com/rjsf-team/react-jsonschema-form/tree/main/packages/mui)
 - [Semantic UI](https://github.com/rjsf-team/react-jsonschema-form/tree/main/packages/semantic-ui)
 

package-lock.json

@@ -66,7 +66,6 @@
     "packages/docs",
     "packages/fluent-ui",
     "packages/fluentui-rc",
-    "packages/material-ui",
     "packages/mui",
     "packages/playground",
     "packages/react-bootstrap",