diff --git a/package.json b/package.json
index 3ee0dad7ee..90d523ad7c 100644
--- a/package.json
+++ b/package.json
@@ -68,8 +68,14 @@
   "license": "LGPL-2.1",
   "browser": "./lib/p5.min.js",
   "exports": {
-    ".": "./dist/app.js",
-    "./core": "./dist/core/main.js",
+    ".": {
+      "types": "./types/p5.d.ts",
+      "default": "./dist/app.js"
+    },
+    "./core": {
+      "types": "./types/core/main.d.ts",
+      "default": "./dist/core/main.js"
+    },
     "./shape": "./dist/shape/index.js",
     "./accessibility": "./dist/accessibility/index.js",
     "./friendlyErrors": "./dist/core/friendlyErrors/index.js",
diff --git a/utils/helper.mjs b/utils/helper.mjs
index 6c340bc1df..bcde260b7f 100644
--- a/utils/helper.mjs
+++ b/utils/helper.mjs
@@ -286,7 +286,8 @@ function generateDeclarationFile(items, organizedData) {
             params: (entry.params || []).map(param => ({
               name: param.name,
               type: generateTypeFromTag(param),
-              optional: param.type?.type === 'OptionalType'
+              optional: param.type?.type === 'OptionalType',
+              rest: param.type?.type === 'RestType'
             })),
             module,
             submodule,
@@ -307,9 +308,14 @@ function generateDeclarationFile(items, organizedData) {
               params: (entry.params || []).map(param => ({
                 name: param.name,
                 type: generateTypeFromTag(param),
-                optional: param.type?.type === 'OptionalType'
+                optional: param.type?.type === 'OptionalType',
+                rest: param.type?.type === 'RestType'
               })),
-              returnType: entry.returns?.[0] ? generateTypeFromTag(entry.returns[0]) : 'void',
+              returnType: entry.tags?.find(tag => tag.title === "chainable")
+                ? "this"
+                : entry.returns?.[0]
+                  ? generateTypeFromTag(entry.returns[0])
+                  : 'void',
               module,
               submodule,
               class: className,
@@ -423,7 +429,7 @@ export function generateTypeFromTag(param) {
 
     let type = param.type;
     let prefix = '';
-    const isOptional = param.type?.type === 'OptionalType';
+    const isOptional = param.optional || param.type?.type === 'OptionalType';
     if (typeof type === 'string') {
       type = normalizeTypeName(type);
     } else if (param.type?.type) {
@@ -432,7 +438,7 @@ export function generateTypeFromTag(param) {
       type = 'any';
     }
 
-    if (param.type?.type === 'RestType') {
+    if (param.rest || param.type?.type === 'RestType') {
       prefix = '...';
     }