Add support for displaying default param values

packages/react-docs/src/components/signature.tsx

@@ -91,6 +91,7 @@ function renderParameters(
 ) {
     const params = _.map(parameters, (p: Parameter) => {
         const isOptional = p.isOptional;
+        const hasDefaultValue = !_.isUndefined(p.defaultValue);
         const type = (
             <Type
                 type={p.type}
@@ -103,6 +104,7 @@ function renderParameters(
             <span key={`param-${p.type}-${p.name}`}>
                 {p.name}
                 {isOptional && '?'}: {type}
+                {hasDefaultValue && ` = ${p.defaultValue}`}
             </span>
         );
     });

packages/react-docs/src/types.ts

@@ -140,6 +140,7 @@ export interface Parameter {
     comment: string;
     isOptional: boolean;
     type: Type;
+    defaultValue?: string;
 }
 
 export interface TypeParameter {

packages/react-docs/src/utils/typedoc_utils.ts

@@ -395,6 +395,7 @@ export const typeDocUtils = {
             name: entity.name,
             comment,
             isOptional,
+            defaultValue: entity.defaultValue,
             type,
         };
         return parameter;