diff --git a/package-lock.json b/package-lock.json
index 49c335b0..a39fc1af 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,7 @@
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@@ -2675,6 +2675,58 @@
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@@ -3025,6 +3077,36 @@
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@@ -3245,6 +3327,209 @@
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@@ -3401,6 +3703,15 @@
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@@ -3432,6 +3743,22 @@
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+      "resolved": "https://registry.npmjs.org/diff/-/diff-8.0.2.tgz",
+      "integrity": "sha512-sSuxWU5j5SR9QQji/o2qMvqRNYRDOcBTgsJ/DeCf4iSN4gW+gNMXM7wFIP+fdXZxoNiAnHUTGjCr+TSWXdRDKg==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.3.1"
+      }
+    },
     "node_modules/dotty": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/dotty/-/dotty-0.1.2.tgz",
@@ -3822,6 +4197,26 @@
       "dev": true,
       "license": "BSD-3-Clause"
     },
+    "node_modules/dts-resolver": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/dts-resolver/-/dts-resolver-2.1.1.tgz",
+      "integrity": "sha512-3BiGFhB6mj5Kv+W2vdJseQUYW+SKVzAFJL6YNP6ursbrwy1fXHRotfHi3xLNxe4wZl/K8qbAFeCDjZLjzqxxRw==",
+      "dev": true,
+      "engines": {
+        "node": ">=20.18.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sxzz"
+      },
+      "peerDependencies": {
+        "oxc-resolver": ">=11.0.0"
+      },
+      "peerDependenciesMeta": {
+        "oxc-resolver": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/eastasianwidth": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/eastasianwidth/-/eastasianwidth-0.2.0.tgz",
@@ -3841,6 +4236,15 @@
       "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
       "dev": true
     },
+    "node_modules/empathic": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/empathic/-/empathic-2.0.0.tgz",
+      "integrity": "sha512-i6UzDscO/XfAcNYD75CfICkmfLedpyPDdozrLMmQc5ORaQcdMoc21OnlEylMIqI7U8eniKrPMxxtj8k0vhmJhA==",
+      "dev": true,
+      "engines": {
+        "node": ">=14"
+      }
+    },
     "node_modules/es5-ext": {
       "version": "0.10.64",
       "resolved": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.64.tgz",
@@ -4159,6 +4563,18 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/get-tsconfig": {
+      "version": "4.10.1",
+      "resolved": "https://registry.npmjs.org/get-tsconfig/-/get-tsconfig-4.10.1.tgz",
+      "integrity": "sha512-auHyJ4AgMz7vgS8Hp3N6HXSmlMdUyhSUrfBF16w153rxtLIEOE+HGqaBppczZvnHLqQJfiHotCYpNhl0lUROFQ==",
+      "dev": true,
+      "dependencies": {
+        "resolve-pkg-maps": "^1.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/privatenumber/get-tsconfig?sponsor=1"
+      }
+    },
     "node_modules/glob": {
       "version": "8.0.3",
       "resolved": "https://registry.npmjs.org/glob/-/glob-8.0.3.tgz",
@@ -4243,6 +4659,12 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/hookable": {
+      "version": "5.5.3",
+      "resolved": "https://registry.npmjs.org/hookable/-/hookable-5.5.3.tgz",
+      "integrity": "sha512-Yc+BQe8SvoXH1643Qez1zqLRmbA5rCL+sSmk6TVos0LWVfNIB7PGncdlId77WzLGSIB5KaWgTaNTs2lNVEI6VQ==",
+      "dev": true
+    },
     "node_modules/iconv-lite": {
       "version": "0.4.24",
       "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
@@ -4751,6 +5173,15 @@
         "url": "https://github.com/chalk/supports-color?sponsor=1"
       }
     },
+    "node_modules/jiti": {
+      "version": "2.5.1",
+      "resolved": "https://registry.npmjs.org/jiti/-/jiti-2.5.1.tgz",
+      "integrity": "sha512-twQoecYPiVA5K/h6SxtORw/Bs3ar+mLUtoPSc7iMXzQzK8d7eJ/R09wmTwAjiamETn1cXYPGfNnu7DMoHgu12w==",
+      "dev": true,
+      "bin": {
+        "jiti": "lib/jiti-cli.mjs"
+      }
+    },
     "node_modules/js-tokens": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
@@ -5168,6 +5599,12 @@
         "node": "14 || >=16.14"
       }
     },
+    "node_modules/pathe": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/pathe/-/pathe-2.0.3.tgz",
+      "integrity": "sha512-WUjGcAqP1gQacoQe+OBJsFA7Ld4DyXuUIjZ5cc75cLHvJ7dtNsTugphxIADwspS+AraAUePCKrSVtPLFj/F88w==",
+      "dev": true
+    },
     "node_modules/picocolors": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
@@ -5214,6 +5651,35 @@
         "url": "https://github.com/prettier/prettier?sponsor=1"
       }
     },
+    "node_modules/quansync": {
+      "version": "0.2.11",
+      "resolved": "https://registry.npmjs.org/quansync/-/quansync-0.2.11.tgz",
+      "integrity": "sha512-AifT7QEbW9Nri4tAwR5M/uzpBuqfZf+zwaEM/QkzEjj7NBuFD2rBuy0K3dE+8wltbezDV7JMA0WfnCPYRSYbXA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/antfu"
+        },
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/sxzz"
+        }
+      ]
+    },
+    "node_modules/readdirp": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-4.1.2.tgz",
+      "integrity": "sha512-GDhwkLfywWL2s6vEjyhri+eXmfH6j1L7JE27WhqLeYzoh/A3DBaYGEj2H/HFZCn/kMfim73FXxEJTw06WtxQwg==",
+      "dev": true,
+      "engines": {
+        "node": ">= 14.18.0"
+      },
+      "funding": {
+        "type": "individual",
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
     "node_modules/rechoir": {
       "version": "0.6.2",
       "resolved": "https://registry.npmjs.org/rechoir/-/rechoir-0.6.2.tgz",
@@ -5328,6 +5794,15 @@
         "node": ">=8"
       }
     },
+    "node_modules/resolve-pkg-maps": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/resolve-pkg-maps/-/resolve-pkg-maps-1.0.0.tgz",
+      "integrity": "sha512-seS2Tj26TBVOC2NIc2rOe2y2ZO7efxITtLZcGSOnHHNOQ7CkiUBfw0Iw2ck6xkIhPwLhKNLS8BO+hEpngQlqzw==",
+      "dev": true,
+      "funding": {
+        "url": "https://github.com/privatenumber/resolve-pkg-maps?sponsor=1"
+      }
+    },
     "node_modules/restore-cursor": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-2.0.0.tgz",
@@ -5397,6 +5872,89 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/rolldown": {
+      "version": "1.0.0-beta.32",
+      "resolved": "https://registry.npmjs.org/rolldown/-/rolldown-1.0.0-beta.32.tgz",
+      "integrity": "sha512-vxI2sPN07MMaoYKlFrVva5qZ1Y7DAZkgp7MQwTnyHt4FUMz9Sh+YeCzNFV9JYHI6ZNwoGWLCfCViE3XVsRC1cg==",
+      "dev": true,
+      "dependencies": {
+        "@oxc-project/runtime": "=0.81.0",
+        "@oxc-project/types": "=0.81.0",
+        "@rolldown/pluginutils": "1.0.0-beta.32",
+        "ansis": "^4.0.0"
+      },
+      "bin": {
+        "rolldown": "bin/cli.mjs"
+      },
+      "optionalDependencies": {
+        "@rolldown/binding-android-arm64": "1.0.0-beta.32",
+        "@rolldown/binding-darwin-arm64": "1.0.0-beta.32",
+        "@rolldown/binding-darwin-x64": "1.0.0-beta.32",
+        "@rolldown/binding-freebsd-x64": "1.0.0-beta.32",
+        "@rolldown/binding-linux-arm-gnueabihf": "1.0.0-beta.32",
+        "@rolldown/binding-linux-arm64-gnu": "1.0.0-beta.32",
+        "@rolldown/binding-linux-arm64-musl": "1.0.0-beta.32",
+        "@rolldown/binding-linux-x64-gnu": "1.0.0-beta.32",
+        "@rolldown/binding-linux-x64-musl": "1.0.0-beta.32",
+        "@rolldown/binding-openharmony-arm64": "1.0.0-beta.32",
+        "@rolldown/binding-wasm32-wasi": "1.0.0-beta.32",
+        "@rolldown/binding-win32-arm64-msvc": "1.0.0-beta.32",
+        "@rolldown/binding-win32-ia32-msvc": "1.0.0-beta.32",
+        "@rolldown/binding-win32-x64-msvc": "1.0.0-beta.32"
+      }
+    },
+    "node_modules/rolldown-plugin-dts": {
+      "version": "0.15.6",
+      "resolved": "https://registry.npmjs.org/rolldown-plugin-dts/-/rolldown-plugin-dts-0.15.6.tgz",
+      "integrity": "sha512-AxQlyx3Nszob5QLmVUjz/VnC5BevtUo0h8tliuE0egddss7IbtCBU7GOe7biRU0fJNRQJmQjPKXFcc7K98j3+w==",
+      "dev": true,
+      "dependencies": {
+        "@babel/generator": "^7.28.0",
+        "@babel/parser": "^7.28.0",
+        "@babel/types": "^7.28.2",
+        "ast-kit": "^2.1.1",
+        "birpc": "^2.5.0",
+        "debug": "^4.4.1",
+        "dts-resolver": "^2.1.1",
+        "get-tsconfig": "^4.10.1"
+      },
+      "engines": {
+        "node": ">=20.18.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sxzz"
+      },
+      "peerDependencies": {
+        "@typescript/native-preview": ">=7.0.0-dev.20250601.1",
+        "rolldown": "^1.0.0-beta.9",
+        "typescript": "^5.0.0",
+        "vue-tsc": "~3.0.3"
+      },
+      "peerDependenciesMeta": {
+        "@typescript/native-preview": {
+          "optional": true
+        },
+        "typescript": {
+          "optional": true
+        },
+        "vue-tsc": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/rolldown-plugin-dts/node_modules/@babel/types": {
+      "version": "7.28.2",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.28.2.tgz",
+      "integrity": "sha512-ruv7Ae4J5dUYULmeXw1gmb7rYRz57OWCPM57pHojnLq/3Z1CK2lNSLTCVjxVk1F/TZHwOZZrOWi0ur95BbLxNQ==",
+      "dev": true,
+      "dependencies": {
+        "@babel/helper-string-parser": "^7.27.1",
+        "@babel/helper-validator-identifier": "^7.27.1"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
     "node_modules/run-async": {
       "version": "2.4.1",
       "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.4.1.tgz",
@@ -5809,6 +6367,57 @@
         "node": ">=0.12"
       }
     },
+    "node_modules/tinyexec": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.0.1.tgz",
+      "integrity": "sha512-5uC6DDlmeqiOwCPmK9jMSdOuZTh8bU39Ys6yidB+UTt5hfZUPGAypSgFRiEp+jbi9qH40BLDvy85jIU88wKSqw==",
+      "dev": true
+    },
+    "node_modules/tinyglobby": {
+      "version": "0.2.14",
+      "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.14.tgz",
+      "integrity": "sha512-tX5e7OM1HnYr2+a2C/4V0htOcSQcoSTH9KgJnVvNm5zm/cyEWKJ7j7YutsH9CxMdtOkkLFy2AHrMci9IM8IPZQ==",
+      "dev": true,
+      "dependencies": {
+        "fdir": "^6.4.4",
+        "picomatch": "^4.0.2"
+      },
+      "engines": {
+        "node": ">=12.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/SuperchupuDev"
+      }
+    },
+    "node_modules/tinyglobby/node_modules/fdir": {
+      "version": "6.5.0",
+      "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.5.0.tgz",
+      "integrity": "sha512-tIbYtZbucOs0BRGqPJkshJUYdL+SDH7dVM8gjy+ERp3WAUjLEFJE+02kanyHtwjWOnwrKYBiwAmM0p4kLJAnXg==",
+      "dev": true,
+      "engines": {
+        "node": ">=12.0.0"
+      },
+      "peerDependencies": {
+        "picomatch": "^3 || ^4"
+      },
+      "peerDependenciesMeta": {
+        "picomatch": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/tinyglobby/node_modules/picomatch": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
+      "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
+      "dev": true,
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/jonschlinkert"
+      }
+    },
     "node_modules/tmp": {
       "version": "0.0.33",
       "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
@@ -5852,6 +6461,82 @@
         "node": ">=8.0"
       }
     },
+    "node_modules/tree-kill": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/tree-kill/-/tree-kill-1.2.2.tgz",
+      "integrity": "sha512-L0Orpi8qGpRG//Nd+H90vFB+3iHnue1zSSGmNOOCh1GLJ7rUKVwV2HvijphGQS2UmhUZewS9VgvxYIdgr+fG1A==",
+      "dev": true,
+      "bin": {
+        "tree-kill": "cli.js"
+      }
+    },
+    "node_modules/tsdown": {
+      "version": "0.14.1",
+      "resolved": "https://registry.npmjs.org/tsdown/-/tsdown-0.14.1.tgz",
+      "integrity": "sha512-/nBuFDKZeYln9hAxwWG5Cm55/823sNIVI693iVi0xRFHzf9OVUq4b/lx9PH1TErFr/IQ0kd2hutFbJIPM0XQWA==",
+      "dev": true,
+      "dependencies": {
+        "ansis": "^4.1.0",
+        "cac": "^6.7.14",
+        "chokidar": "^4.0.3",
+        "debug": "^4.4.1",
+        "diff": "^8.0.2",
+        "empathic": "^2.0.0",
+        "hookable": "^5.5.3",
+        "rolldown": "latest",
+        "rolldown-plugin-dts": "^0.15.6",
+        "semver": "^7.7.2",
+        "tinyexec": "^1.0.1",
+        "tinyglobby": "^0.2.14",
+        "tree-kill": "^1.2.2",
+        "unconfig": "^7.3.2"
+      },
+      "bin": {
+        "tsdown": "dist/run.mjs"
+      },
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sxzz"
+      },
+      "peerDependencies": {
+        "@arethetypeswrong/core": "^0.18.1",
+        "publint": "^0.3.0",
+        "typescript": "^5.0.0",
+        "unplugin-lightningcss": "^0.4.0",
+        "unplugin-unused": "^0.5.0"
+      },
+      "peerDependenciesMeta": {
+        "@arethetypeswrong/core": {
+          "optional": true
+        },
+        "publint": {
+          "optional": true
+        },
+        "typescript": {
+          "optional": true
+        },
+        "unplugin-lightningcss": {
+          "optional": true
+        },
+        "unplugin-unused": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/tsdown/node_modules/semver": {
+      "version": "7.7.2",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.2.tgz",
+      "integrity": "sha512-RF0Fw+rO5AMf9MAyaRXI4AV0Ulj5lMHqVxxdSgiVbixSCXoEmmX/jk0CuJw4+3SqroYO9VoUh+HcuJivvtJemA==",
+      "dev": true,
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/tslib": {
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
@@ -5872,6 +6557,8 @@
       "integrity": "sha512-CWBzXQrc/qOkhidw1OzBTQuYRbfyxDXJMVJ1XNwUHGROVmuaeiEm3OslpZ1RV96d7SKKjZKrSJu3+t/xlw3R9A==",
       "dev": true,
       "license": "Apache-2.0",
+      "optional": true,
+      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -5880,6 +6567,21 @@
         "node": ">=14.17"
       }
     },
+    "node_modules/unconfig": {
+      "version": "7.3.2",
+      "resolved": "https://registry.npmjs.org/unconfig/-/unconfig-7.3.2.tgz",
+      "integrity": "sha512-nqG5NNL2wFVGZ0NA/aCFw0oJ2pxSf1lwg4Z5ill8wd7K4KX/rQbHlwbh+bjctXL5Ly1xtzHenHGOK0b+lG6JVg==",
+      "dev": true,
+      "dependencies": {
+        "@quansync/fs": "^0.1.1",
+        "defu": "^6.1.4",
+        "jiti": "^2.4.2",
+        "quansync": "^0.2.8"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
+      }
+    },
     "node_modules/unicode-canonical-property-names-ecmascript": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-2.0.1.tgz",
diff --git a/package.json b/package.json
index b5980429..c772bed6 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,7 @@
   "publishConfig": {
     "access": "public"
   },
+  "type": "module",
   "files": [
     "cosmos/",
     "cosmos_proto/",
@@ -38,14 +39,12 @@
     "precodegen": "./scripts/exports_protos.sh",
     "codegen": "rm -rf ./src && ./scripts/codegen.js && npm run format",
     "prepare-publishing": "./scripts/prepare-publishing.sh",
-    "build": "rm -rf ./build && tsc && npm run prepare-publishing"
-  },
-  "dependencies": {
+    "build": "tsdown --unbundle --sourcemap 'src/**' -d build/ && npm run prepare-publishing"
   },
   "devDependencies": {
     "@cosmology/telescope": "^1.12.20",
     "@types/node": "^15.6.2",
     "prettier": "^3.6.2",
-    "typescript": "~5.9"
+    "tsdown": "^0.14.1"
   }
 }
diff --git a/scripts/codegen.js b/scripts/codegen.js
index f76e479e..6a0c6d75 100755
--- a/scripts/codegen.js
+++ b/scripts/codegen.js
@@ -106,7 +106,7 @@ telescope({
 
     // Exports we want to provide at the root of the "cosmjs-types" package
 
-    export { DeepPartial, Exact } from "./helpers";
+    export type { DeepPartial, Exact } from "./helpers";
     `;
     writeFileSync(`${outPath}/index.ts`, index_ts);
 
diff --git a/scripts/prepare-publishing.sh b/scripts/prepare-publishing.sh
index eb098184..8eca4486 100755
--- a/scripts/prepare-publishing.sh
+++ b/scripts/prepare-publishing.sh
@@ -12,10 +12,8 @@ FILES=(
   helpers.js.map
   index.d.ts
   index.js
-  index.js.map
   json-safe.d.ts
   json-safe.js
-  json-safe.js.map
   utf8.d.ts
   utf8.js
   utf8.js.map
diff --git a/src/index.ts b/src/index.ts
index e715bb14..bfe8ca12 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -2,4 +2,4 @@
 
 // Exports we want to provide at the root of the "cosmjs-types" package
 
-export { DeepPartial, Exact } from "./helpers";
+export type { DeepPartial, Exact } from "./helpers";
diff --git a/tsconfig.json b/tsconfig.json
index 8769788b..3bd079b1 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,9 +4,9 @@
     "declaration": true,
     "esModuleInterop": true,
     "forceConsistentCasingInFileNames": true,
+    "isolatedModules": true,
     "lib": ["es2020"],
-    "module": "commonjs",
-    "moduleResolution": "node",
+    "module": "node20",
     "newLine": "LF",
     "noEmitOnError": true,
     "noFallthroughCasesInSwitch": true,