diff --git a/change/@nova-examples-d474789e-8fec-4908-be19-e9417ec6f4df.json b/change/@nova-examples-d474789e-8fec-4908-be19-e9417ec6f4df.json
new file mode 100644
index 0000000..553ab7f
--- /dev/null
+++ b/change/@nova-examples-d474789e-8fec-4908-be19-e9417ec6f4df.json
@@ -0,0 +1,7 @@
+{
+  "type": "none",
+  "comment": "Add nested export conditions",
+  "packageName": "@nova/examples",
+  "email": "stwilczy@microsoft.com",
+  "dependentChangeType": "none"
+}
diff --git a/change/@nova-react-a2b641e3-77cc-4e9c-99f8-8f4db5031ac0.json b/change/@nova-react-a2b641e3-77cc-4e9c-99f8-8f4db5031ac0.json
new file mode 100644
index 0000000..2b10ad8
--- /dev/null
+++ b/change/@nova-react-a2b641e3-77cc-4e9c-99f8-8f4db5031ac0.json
@@ -0,0 +1,7 @@
+{
+  "type": "patch",
+  "comment": "Add .d.mts declarations and nested export conditions for modern moduleResolution",
+  "packageName": "@nova/react",
+  "email": "stwilczy@microsoft.com",
+  "dependentChangeType": "patch"
+}
diff --git a/change/@nova-react-test-utils-70d1decc-1438-42a9-a486-de651f2fa6bd.json b/change/@nova-react-test-utils-70d1decc-1438-42a9-a486-de651f2fa6bd.json
new file mode 100644
index 0000000..abdf84f
--- /dev/null
+++ b/change/@nova-react-test-utils-70d1decc-1438-42a9-a486-de651f2fa6bd.json
@@ -0,0 +1,7 @@
+{
+  "type": "patch",
+  "comment": "Fix exports map: move types condition before import/require for modern moduleResolution compatibility",
+  "packageName": "@nova/react-test-utils",
+  "email": "stwilczy@microsoft.com",
+  "dependentChangeType": "patch"
+}
diff --git a/change/@nova-types-7b01095b-4805-46aa-a17c-a16bcea5de7d.json b/change/@nova-types-7b01095b-4805-46aa-a17c-a16bcea5de7d.json
new file mode 100644
index 0000000..4d268fe
--- /dev/null
+++ b/change/@nova-types-7b01095b-4805-46aa-a17c-a16bcea5de7d.json
@@ -0,0 +1,7 @@
+{
+  "type": "patch",
+  "comment": "Add .d.mts declarations and nested export conditions for modern moduleResolution",
+  "packageName": "@nova/types",
+  "email": "stwilczy@microsoft.com",
+  "dependentChangeType": "patch"
+}
diff --git a/packages/examples/package.json b/packages/examples/package.json
index b795402..17d5f21 100644
--- a/packages/examples/package.json
+++ b/packages/examples/package.json
@@ -70,9 +70,8 @@
   "publishConfig": {
     "exports": {
       ".": {
-        "types": "./lib/index.d.ts",
-        "import": "./lib/index.mjs",
-        "require": "./lib/index.js"
+        "import": { "types": "./lib/index.d.mts", "default": "./lib/index.mjs" },
+        "require": { "types": "./lib/index.d.ts", "default": "./lib/index.js" }
       }
     },
     "main": "./lib/index",
diff --git a/packages/nova-react-test-utils/package.json b/packages/nova-react-test-utils/package.json
index 1f6faed..f7c59a8 100644
--- a/packages/nova-react-test-utils/package.json
+++ b/packages/nova-react-test-utils/package.json
@@ -113,19 +113,16 @@
   "publishConfig": {
     "exports": {
       ".": {
-        "import": "./lib/relay/index.mjs",
-        "require": "./lib/relay/index.js",
-        "types": "./lib/relay/index.d.ts"
+        "import": { "types": "./lib/relay/index.d.mts", "default": "./lib/relay/index.mjs" },
+        "require": { "types": "./lib/relay/index.d.ts", "default": "./lib/relay/index.js" }
       },
       "./relay": {
-        "import": "./lib/relay/index.mjs",
-        "require": "./lib/relay/index.js",
-        "types": "./lib/relay/index.d.ts"
+        "import": { "types": "./lib/relay/index.d.mts", "default": "./lib/relay/index.mjs" },
+        "require": { "types": "./lib/relay/index.d.ts", "default": "./lib/relay/index.js" }
       },
       "./apollo": {
-        "import": "./lib/apollo/index.mjs",
-        "require": "./lib/apollo/index.js",
-        "types": "./lib/apollo/index.d.ts"
+        "import": { "types": "./lib/apollo/index.d.mts", "default": "./lib/apollo/index.mjs" },
+        "require": { "types": "./lib/apollo/index.d.ts", "default": "./lib/apollo/index.js" }
       }
     },
     "main": "./lib/relay/index",
diff --git a/packages/nova-react/package.json b/packages/nova-react/package.json
index 9ae4255..8f54c8f 100644
--- a/packages/nova-react/package.json
+++ b/packages/nova-react/package.json
@@ -41,9 +41,8 @@
   "publishConfig": {
     "exports": {
       ".": {
-        "types": "./lib/index.d.ts",
-        "import": "./lib/index.mjs",
-        "require": "./lib/index.js"
+        "import": { "types": "./lib/index.d.mts", "default": "./lib/index.mjs" },
+        "require": { "types": "./lib/index.d.ts", "default": "./lib/index.js" }
       }
     },
     "main": "./lib/index",
diff --git a/packages/nova-types/package.json b/packages/nova-types/package.json
index 3d308e6..d34fc08 100644
--- a/packages/nova-types/package.json
+++ b/packages/nova-types/package.json
@@ -21,9 +21,8 @@
   "publishConfig": {
     "exports": {
       ".": {
-        "types": "./lib/index.d.ts",
-        "import": "./lib/index.mjs",
-        "require": "./lib/index.js"
+        "import": { "types": "./lib/index.d.mts", "default": "./lib/index.mjs" },
+        "require": { "types": "./lib/index.d.ts", "default": "./lib/index.js" }
       }
     },
     "main": "./lib/index",
diff --git a/scripts/just.config.ts b/scripts/just.config.ts
index 5ea1cbd..264529b 100644
--- a/scripts/just.config.ts
+++ b/scripts/just.config.ts
@@ -4,7 +4,18 @@ import * as path from "path";
 import * as fs from "fs";
 import * as glob from "fast-glob";
 
-export const types = tscTask({ emitDeclarationOnly: true });
+export const types = async () => {
+  await tscTask({ emitDeclarationOnly: true })();
+  // Copy .d.ts -> .d.mts so ESM imports resolve to correct declaration files
+  const dtsFiles = glob.sync(["lib/**/*.d.ts"], { ignore: ["lib/**/*.d.mts"] });
+  for (const file of dtsFiles) {
+    fs.copyFileSync(file, file.replace(/\.d\.ts$/, ".d.mts"));
+  }
+  const mapFiles = glob.sync(["lib/**/*.d.ts.map"]);
+  for (const file of mapFiles) {
+    fs.copyFileSync(file, file.replace(/\.d\.ts\.map$/, ".d.mts.map"));
+  }
+};
 
 export const build = () => {
   const baseEsbuildOptions: EsbuildBuildOptions = {