update inlinePathParameters and useBigInt

Author: devalog

fern/products/sdks/pages/typescript/configuration.mdx

@@ -307,7 +307,20 @@ public async post(
 
 </ParamField>
 
-<ParamField path="inlinePathParameters" type="boolean">
+<ParamField path="inlinePathParameters" type="boolean" default="true">
+Inline path parameters into request types.
+
+`inlinePathParameters: false`:
+
+```typescript
+await service.getFoo("pathParamValue", { id: "SOME_ID" });
+```
+
+`inlinePathParameters: true`:
+```typescript
+await service.getFoo({ pathParamName: "pathParamValue", id: "SOME_ID" });
+```
+
 </ParamField>
 
 <ParamField path="namespaceExport" type="string">
@@ -388,7 +401,55 @@ By default, names are based on the organization and API names in the Fern Defini
 
 </ParamField>
 
-<ParamField path="useBigInt" type="boolean">
+<ParamField path="useBigInt" type="boolean" default="false">
+When `useBigInt` is set to `true`, a customized JSON serializer & deserializer is used that will preserve the precision of `bigint`'s, as opposed to the native `JSON.stringify` and `JSON.parse` function which converts `bigint`'s to number's losing precision.
+
+When combining `useBigInt` with our serialization layer (`no-serde: false`), both the request and response properties that are marked as `long` and `bigint` in OpenAPI/Fern spec, will consistently be `bigint`'s.
+However, when disabling the serialization layer (`no-serde: true`), they will be typed as `number | bigint`.
+
+Here's an overview of what to expect from the generated types when combining `useBigInt` and `noSerde` with the following Fern definition:
+
+*Fern definition*:
+
+```yaml
+types:
+  ObjectWithOptionalField:
+    properties:
+      longProp: long
+      bigIntProp: bigint
+```
+
+*TypeScript output*:
+
+```typescript
+// useBigInt: true
+// noSerde: false
+interface ObjectWithLongAndBigInt {
+  longProp: bigint;
+  bigIntProp: bigint;
+}
+
+// useBigInt: true
+// noSerde: true
+interface ObjectWithLongAndBigInt {
+  longProp: bigint | number;
+  bigIntProp: bigint | number;
+}
+
+// useBigInt: false
+// noSerde: false
+interface ObjectWithLongAndBigInt {
+  longProp: number;
+  bigIntProp: string;
+}
+
+// useBigInt: false
+// noSerde: true
+interface ObjectWithLongAndBigInt {
+  longProp: number;
+  bigIntProp: string;
+}
+```
 </ParamField>
 
 <ParamField path="useBrandedStringAliases" type="boolean" default="false">