[FormControl] Add missing types in useFormControl (mui#35168)

packages/mui-material/src/FormControl/FormControlContext.ts

@@ -0,0 +1,36 @@
+import * as React from 'react';
+import type { FormControlProps } from './FormControl';
+
+type ContextFromPropsKey =
+  | 'color'
+  | 'disabled'
+  | 'error'
+  | 'fullWidth'
+  | 'hiddenLabel'
+  | 'margin'
+  | 'onBlur'
+  | 'onFocus'
+  | 'required'
+  | 'size'
+  | 'variant';
+
+export interface FormControlState extends Pick<FormControlProps, ContextFromPropsKey> {
+  adornedStart: boolean;
+  filled: boolean;
+  focused: boolean;
+  onEmpty: () => void;
+  onFilled: () => void;
+  registerEffect: () => void;
+  setAdornedStart: React.Dispatch<React.SetStateAction<boolean>>;
+}
+
+/**
+ * @ignore - internal component.
+ */
+const FormControlContext = React.createContext<FormControlState | undefined>(undefined);
+
+if (process.env.NODE_ENV !== 'production') {
+  FormControlContext.displayName = 'FormControlContext';
+}
+
+export default FormControlContext;

packages/mui-material/src/FormControl/index.d.ts

@@ -1,7 +1,9 @@
 export { default } from './FormControl';
 export * from './FormControl';
 
-export { default as useFormControl, FormControlState } from './useFormControl';
+export { default as useFormControl } from './useFormControl';
+
+export { FormControlState } from './FormControlContext';
 
 export { default as formControlClasses } from './formControlClasses';
 export * from './formControlClasses';

packages/mui-material/src/FormControl/useFormControl.ts

@@ -0,0 +1,6 @@
+import * as React from 'react';
+import FormControlContext, { FormControlState } from './FormControlContext';
+
+export default function useFormControl(): FormControlState | undefined {
+  return React.useContext(FormControlContext);
+}