diff --git a/.github/workflows/ci-supabase-js.yml b/.github/workflows/ci-supabase-js.yml
index 38332e8f2..0a0a500c6 100644
--- a/.github/workflows/ci-supabase-js.yml
+++ b/.github/workflows/ci-supabase-js.yml
@@ -110,6 +110,42 @@ jobs:
           parallel-finished: true
           fail-on-error: false
         continue-on-error: true
+
+  module-resolution:
+    name: Module Resolution Tests
+    runs-on: ubuntu-latest
+    needs: build-package
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          filter: tree:0
+          fetch-depth: 0
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Download build artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: packages-dist
+          path: ./packages/core
+
+      - name: Validate package exports (attw)
+        run: npx nx test:exports supabase-js
+
+      - name: Test ESM imports
+        run: npx nx test:esm supabase-js
+
+      - name: Test CJS requires
+        run: npx nx test:cjs supabase-js
+
   deno-tests:
     name: Deno Tests
     runs-on: ubuntu-latest
diff --git a/deno.lock b/deno.lock
index 2f470b651..ba06d649a 100644
--- a/deno.lock
+++ b/deno.lock
@@ -130,6 +130,7 @@
         "npm:prettier@^3.6.2",
         "npm:ts-jest@^29.4.2",
         "npm:ts-node@^10.9.1",
+        "npm:tsdown@0.18",
         "npm:tslib@^2.3.0",
         "npm:typedoc@~0.27.9",
         "npm:typescript@~5.8.3",
@@ -196,10 +197,7 @@
           "dependencies": [
             "npm:form-data@4",
             "npm:iceberg-js@~0.8.1",
-            "npm:ts-loader@^9.4.2",
-            "npm:tslib@2.8.1",
-            "npm:webpack-cli@^5.0.1",
-            "npm:webpack@^5.75.0"
+            "npm:tslib@2.8.1"
           ]
         }
       },
@@ -214,10 +212,7 @@
             "npm:jsr@~0.13.5",
             "npm:puppeteer@^24.9.0",
             "npm:serve@^14.2.1",
-            "npm:ts-loader@^9.5.4",
-            "npm:tsd@~0.30.4",
-            "npm:webpack-cli@^4.9.2",
-            "npm:webpack@^5.69.1"
+            "npm:tsd@0.33"
           ]
         }
       }
diff --git a/nx.json b/nx.json
index f47da1b91..24ff0dbd3 100644
--- a/nx.json
+++ b/nx.json
@@ -50,6 +50,7 @@
       "{projectRoot}/webpack.config.[jt]s",
       "{projectRoot}/vite.config.[jt]s",
       "{projectRoot}/rollup.config.[jt]s",
+      "{projectRoot}/tsdown.config.[jt]s",
       "{projectRoot}/tsconfig*.json",
       "{projectRoot}/package.json",
       "sharedGlobals"
@@ -74,30 +75,6 @@
       "cache": true,
       "outputs": ["{projectRoot}/dist"]
     },
-    "build:main": {
-      "inputs": ["production", "^production", "buildConfig"],
-      "dependsOn": ["^build:main"],
-      "cache": true,
-      "outputs": ["{projectRoot}/dist/main", "{projectRoot}/dist/tsconfig.tsbuildinfo"]
-    },
-    "build:module": {
-      "inputs": ["production", "^production", "buildConfig"],
-      "dependsOn": ["^build:module"],
-      "cache": true,
-      "outputs": ["{projectRoot}/dist/module", "{projectRoot}/dist/tsconfig.module.tsbuildinfo"]
-    },
-    "build:umd": {
-      "inputs": ["production", "^production", "buildConfig"],
-      "dependsOn": ["^build:umd"],
-      "cache": true,
-      "outputs": ["{projectRoot}/dist/umd"]
-    },
-    "webpack:build": {
-      "inputs": ["production", "^production", "buildConfig"],
-      "dependsOn": ["^webpack:build"],
-      "cache": true,
-      "outputs": ["{projectRoot}/dist"]
-    },
     "test": {
       "inputs": ["testing", "^production"],
       "dependsOn": ["^build"],
@@ -106,7 +83,7 @@
     },
     "test:types": {
       "inputs": ["testing", "^production"],
-      "dependsOn": ["build:module"],
+      "dependsOn": ["build"],
       "cache": true,
       "outputs": []
     },
diff --git a/package-lock.json b/package-lock.json
index 5fc292416..b1ed6f805 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -18,6 +18,7 @@
         "packages/core/supabase-js"
       ],
       "devDependencies": {
+        "@arethetypeswrong/cli": "^0.18.2",
         "@commitlint/cli": "^19.8.1",
         "@commitlint/config-conventional": "^19.8.1",
         "@commitlint/cz-commitlint": "^19.8.1",
@@ -58,6 +59,7 @@
         "prettier": "^3.6.2",
         "ts-jest": "^29.4.2",
         "ts-node": "^10.9.1",
+        "tsdown": "^0.18.0",
         "tslib": "^2.3.0",
         "typedoc": "^0.27.9",
         "typescript": "~5.8.3",
@@ -88,13 +90,13 @@
       "dev": true
     },
     "node_modules/@arethetypeswrong/cli": {
-      "version": "0.16.4",
-      "resolved": "https://registry.npmjs.org/@arethetypeswrong/cli/-/cli-0.16.4.tgz",
-      "integrity": "sha512-qMmdVlJon5FtA+ahn0c1oAVNxiq4xW5lqFiTZ21XHIeVwAVIQ+uRz4UEivqRMsjVV1grzRgJSKqaOrq1MvlVyQ==",
+      "version": "0.18.2",
+      "resolved": "https://registry.npmjs.org/@arethetypeswrong/cli/-/cli-0.18.2.tgz",
+      "integrity": "sha512-PcFM20JNlevEDKBg4Re29Rtv2xvjvQZzg7ENnrWFSS0PHgdP2njibVFw+dRUhNkPgNfac9iUqO0ohAXqQL4hbw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@arethetypeswrong/core": "0.16.4",
+        "@arethetypeswrong/core": "0.18.2",
         "chalk": "^4.1.2",
         "cli-table3": "^0.6.3",
         "commander": "^10.0.1",
@@ -106,7 +108,7 @@
         "attw": "dist/index.js"
       },
       "engines": {
-        "node": ">=18"
+        "node": ">=20"
       }
     },
     "node_modules/@arethetypeswrong/cli/node_modules/commander": {
@@ -120,30 +122,34 @@
       }
     },
     "node_modules/@arethetypeswrong/core": {
-      "version": "0.16.4",
-      "resolved": "https://registry.npmjs.org/@arethetypeswrong/core/-/core-0.16.4.tgz",
-      "integrity": "sha512-RI3HXgSuKTfcBf1hSEg1P9/cOvmI0flsMm6/QL3L3wju4AlHDqd55JFPfXs4pzgEAgy5L9pul4/HPPz99x2GvA==",
+      "version": "0.18.2",
+      "resolved": "https://registry.npmjs.org/@arethetypeswrong/core/-/core-0.18.2.tgz",
+      "integrity": "sha512-GiwTmBFOU1/+UVNqqCGzFJYfBXEytUkiI+iRZ6Qx7KmUVtLm00sYySkfe203C9QtPG11yOz1ZaMek8dT/xnlgg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "@andrewbranch/untar.js": "^1.0.3",
+        "@loaderkit/resolve": "^1.0.2",
         "cjs-module-lexer": "^1.2.3",
         "fflate": "^0.8.2",
-        "lru-cache": "^10.4.3",
+        "lru-cache": "^11.0.1",
         "semver": "^7.5.4",
         "typescript": "5.6.1-rc",
         "validate-npm-package-name": "^5.0.0"
       },
       "engines": {
-        "node": ">=18"
+        "node": ">=20"
       }
     },
     "node_modules/@arethetypeswrong/core/node_modules/lru-cache": {
-      "version": "10.4.3",
-      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-10.4.3.tgz",
-      "integrity": "sha512-JNAzZcXrCt42VGLuYz0zfAzDfAvJWW6AfYlDBQyDV5DClI2m5sAmK+OIO7s59XfsRsWHp02jAJrRadPRGTt6SQ==",
+      "version": "11.2.4",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.2.4.tgz",
+      "integrity": "sha512-B5Y16Jr9LB9dHVkh6ZevG+vAbOsNOYCX+sXvFWFu7B3Iz5mijW3zdbMyhsh8ANd2mSWBYdJgnqi+mL7/LrOPYg==",
       "dev": true,
-      "license": "ISC"
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": "20 || >=22"
+      }
     },
     "node_modules/@arethetypeswrong/core/node_modules/typescript": {
       "version": "5.6.1-rc",
@@ -226,14 +232,14 @@
       }
     },
     "node_modules/@babel/generator": {
-      "version": "7.28.3",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.28.3.tgz",
-      "integrity": "sha512-3lSpxGgvnmZznmBkCRnVREPUFJv2wrv9iAoFDvADJc0ypmdOxdUtcLeBgBJ6zE0PMeTKnxeQzyk0xTBq4Ep7zw==",
+      "version": "7.28.5",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.28.5.tgz",
+      "integrity": "sha512-3EwLFhZ38J4VyIP6WNtt2kUdW9dokXA9Cr4IVIFHuCpZ3H8/YFOl5JjZHisrn1fATPBmKKqXzDFvh9fUwHz6CQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@babel/parser": "^7.28.3",
-        "@babel/types": "^7.28.2",
+        "@babel/parser": "^7.28.5",
+        "@babel/types": "^7.28.5",
         "@jridgewell/gen-mapping": "^0.3.12",
         "@jridgewell/trace-mapping": "^0.3.28",
         "jsesc": "^3.0.2"
@@ -499,9 +505,9 @@
       }
     },
     "node_modules/@babel/helper-validator-identifier": {
-      "version": "7.27.1",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.27.1.tgz",
-      "integrity": "sha512-D2hP9eA+Sqx1kBZgzxZh0y1trbuU+JoDkiEwqhQ36nodYqJwyEIhPSdMNd7lOm/4io72luTPWH20Yda0xOuUow==",
+      "version": "7.28.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.28.5.tgz",
+      "integrity": "sha512-qSs4ifwzKJSV39ucNjsvc6WVHs6b7S03sOh2OcHF9UHfVPqWWALUsNUVzhSBiItjRZoLHx7nIarVjqKVusUZ1Q==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -548,13 +554,13 @@
       }
     },
     "node_modules/@babel/parser": {
-      "version": "7.28.4",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.28.4.tgz",
-      "integrity": "sha512-yZbBqeM6TkpP9du/I2pUZnJsRMGGvOuIrhjzC1AwHwW+6he4mni6Bp/m8ijn0iOuZuPI2BfkCoSRunpyjnrQKg==",
+      "version": "7.28.5",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.28.5.tgz",
+      "integrity": "sha512-KKBU1VGYR7ORr3At5HAtUQ+TV3SzRCXmA/8OdDZiLDBIZxVyzXuztPjfLd3BV1PRAQGCMWWSHYhL0F8d5uHBDQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@babel/types": "^7.28.4"
+        "@babel/types": "^7.28.5"
       },
       "bin": {
         "parser": "bin/babel-parser.js"
@@ -2048,14 +2054,14 @@
       }
     },
     "node_modules/@babel/types": {
-      "version": "7.28.4",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.28.4.tgz",
-      "integrity": "sha512-bkFqkLhh3pMBUQQkpVgWDWq/lqzc2678eUyDlTBhRqhCHFguYYGM0Efga7tYk4TogG/3x0EEl66/OQ+WGbWB/Q==",
+      "version": "7.28.5",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.28.5.tgz",
+      "integrity": "sha512-qQ5m48eI/MFLQ5PxQj4PFaprjyCTLI37ElWMmNs0K8Lk3dVeOdNpB3ks8jc7yM5CDmVC73eMVk/trk3fgmrUpA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "@babel/helper-string-parser": "^7.27.1",
-        "@babel/helper-validator-identifier": "^7.27.1"
+        "@babel/helper-validator-identifier": "^7.28.5"
       },
       "engines": {
         "node": ">=6.9.0"
@@ -2075,6 +2081,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@braidai/lang": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@braidai/lang/-/lang-1.1.2.tgz",
+      "integrity": "sha512-qBcknbBufNHlui137Hft8xauQMTZDKdophmLFv05r2eNmdIv/MlPuP4TdUknHG68UdWLgVZwgxVe735HzJNIwA==",
+      "dev": true,
+      "license": "ISC"
+    },
     "node_modules/@bufbuild/protobuf": {
       "version": "2.7.0",
       "resolved": "https://registry.npmjs.org/@bufbuild/protobuf/-/protobuf-2.7.0.tgz",
@@ -2663,9 +2676,9 @@
       }
     },
     "node_modules/@emnapi/core": {
-      "version": "1.5.0",
-      "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.5.0.tgz",
-      "integrity": "sha512-sbP8GzB1WDzacS8fgNPpHlp6C9VZe+SJP3F90W9rLemaQj2PzIuTEl1qDOYQf58YIpyjViI24y9aPWCjEzY2cg==",
+      "version": "1.7.1",
+      "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.7.1.tgz",
+      "integrity": "sha512-o1uhUASyo921r2XtHYOHy7gdkGLge8ghBEQHMWmyJFoXlpU58kIrhhN3w26lpQb6dspetweapMn2CSNwQ8I4wg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -2674,9 +2687,9 @@
       }
     },
     "node_modules/@emnapi/runtime": {
-      "version": "1.5.0",
-      "resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.5.0.tgz",
-      "integrity": "sha512-97/BJ3iXHww3djw6hYIfErCZFee7qCtrneuLa20UXFCOTCfBM2cvQHjWJ2EG0s0MtdNwInarqCTz35i4wWXHsQ==",
+      "version": "1.7.1",
+      "resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.7.1.tgz",
+      "integrity": "sha512-PVtJr5CmLwYAU9PZDMITZoR5iAOShYREoR45EyyLrbntV50mdePTgUn4AmOw90Ifcj+x2kRjdzr1HP3RrNiHGA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -5056,6 +5069,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@loaderkit/resolve": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/@loaderkit/resolve/-/resolve-1.0.4.tgz",
+      "integrity": "sha512-rJzYKVcV4dxJv+vW6jlvagF8zvGxHJ2+HTr1e2qOejfmGhAApgJHl8Aog4mMszxceTRiKTTbnpgmTO1bEZHV/A==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "@braidai/lang": "^1.0.0"
+      }
+    },
     "node_modules/@napi-rs/wasm-runtime": {
       "version": "0.2.4",
       "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-0.2.4.tgz",
@@ -5760,6 +5783,16 @@
         "yargs-parser": "21.1.1"
       }
     },
+    "node_modules/@oxc-project/types": {
+      "version": "0.101.0",
+      "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.101.0.tgz",
+      "integrity": "sha512-nuFhqlUzJX+gVIPPfuE6xurd4lST3mdcWOhyK/rZO0B9XWMKm79SuszIQEnSMmmDhq1DC8WWVYGVd+6F93o1gQ==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/Boshen"
+      }
+    },
     "node_modules/@parcel/watcher": {
       "version": "2.5.1",
       "resolved": "https://registry.npmjs.org/@parcel/watcher/-/watcher-2.5.1.tgz",
@@ -6143,6 +6176,271 @@
         "node": ">=18"
       }
     },
+    "node_modules/@quansync/fs": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@quansync/fs/-/fs-1.0.0.tgz",
+      "integrity": "sha512-4TJ3DFtlf1L5LDMaM6CanJ/0lckGNtJcMjQ1NAV6zDmA0tEHKZtxNKin8EgPaVX1YzljbxckyT2tJrpQKAtngQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "quansync": "^1.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sxzz"
+      }
+    },
+    "node_modules/@rolldown/binding-android-arm64": {
+      "version": "1.0.0-beta.53",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm64/-/binding-android-arm64-1.0.0-beta.53.tgz",
+      "integrity": "sha512-Ok9V8o7o6YfSdTTYA/uHH30r3YtOxLD6G3wih/U9DO0ucBBFq8WPt/DslU53OgfteLRHITZny9N/qCUxMf9kjQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@rolldown/binding-darwin-arm64": {
+      "version": "1.0.0-beta.53",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-arm64/-/binding-darwin-arm64-1.0.0-beta.53.tgz",
+      "integrity": "sha512-yIsKqMz0CtRnVa6x3Pa+mzTihr4Ty+Z6HfPbZ7RVbk1Uxnco4+CUn7Qbm/5SBol1JD/7nvY8rphAgyAi7Lj6Vg==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@rolldown/binding-darwin-x64": {
+      "version": "1.0.0-beta.53",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-x64/-/binding-darwin-x64-1.0.0-beta.53.tgz",
+      "integrity": "sha512-GTXe+mxsCGUnJOFMhfGWmefP7Q9TpYUseHvhAhr21nCTgdS8jPsvirb0tJwM3lN0/u/cg7bpFNa16fQrjKrCjQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@rolldown/binding-freebsd-x64": {
+      "version": "1.0.0-beta.53",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-freebsd-x64/-/binding-freebsd-x64-1.0.0-beta.53.tgz",
+      "integrity": "sha512-9Tmp7bBvKqyDkMcL4e089pH3RsjD3SUungjmqWtyhNOxoQMh0fSmINTyYV8KXtE+JkxYMPWvnEt+/mfpVCkk8w==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "freebsd"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@rolldown/binding-linux-arm-gnueabihf": {
+      "version": "1.0.0-beta.53",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-1.0.0-beta.53.tgz",
+      "integrity": "sha512-a1y5fiB0iovuzdbjUxa7+Zcvgv+mTmlGGC4XydVIsyl48eoxgaYkA3l9079hyTyhECsPq+mbr0gVQsFU11OJAQ==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@rolldown/binding-linux-arm64-gnu": {
+      "version": "1.0.0-beta.53",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-1.0.0-beta.53.tgz",
+      "integrity": "sha512-bpIGX+ov9PhJYV+wHNXl9rzq4F0QvILiURn0y0oepbQx+7stmQsKA0DhPGwmhfvF856wq+gbM8L92SAa/CBcLg==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
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-        "form-data": "^4.0.0",
-        "ts-loader": "^9.4.2",
-        "webpack": "^5.75.0",
-        "webpack-cli": "^5.0.1"
+        "form-data": "^4.0.0"
       },
       "engines": {
         "node": ">=20.0.0"
@@ -33678,350 +34564,11 @@
         "jsr": "^0.13.5",
         "puppeteer": "^24.9.0",
         "serve": "^14.2.1",
-        "ts-loader": "^9.5.4",
-        "tsd": "^0.30.4",
-        "webpack": "^5.69.1",
-        "webpack-cli": "^4.9.2"
+        "tsd": "^0.33.0"
       },
       "engines": {
         "node": ">=20.0.0"
       }
-    },
-    "packages/core/supabase-js/node_modules/@tsd/typescript": {
-      "version": "5.3.3",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=14.17"
-      }
-    },
-    "packages/core/supabase-js/node_modules/@webpack-cli/configtest": {
-      "version": "1.2.0",
-      "dev": true,
-      "license": "MIT",
-      "peerDependencies": {
-        "webpack": "4.x.x || 5.x.x",
-        "webpack-cli": "4.x.x"
-      }
-    },
-    "packages/core/supabase-js/node_modules/@webpack-cli/info": {
-      "version": "1.5.0",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "envinfo": "^7.7.3"
-      },
-      "peerDependencies": {
-        "webpack-cli": "4.x.x"
-      }
-    },
-    "packages/core/supabase-js/node_modules/@webpack-cli/serve": {
-      "version": "1.7.0",
-      "dev": true,
-      "license": "MIT",
-      "peerDependencies": {
-        "webpack-cli": "4.x.x"
-      },
-      "peerDependenciesMeta": {
-        "webpack-dev-server": {
-          "optional": true
-        }
-      }
-    },
-    "packages/core/supabase-js/node_modules/camelcase-keys": {
-      "version": "6.2.2",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "camelcase": "^5.3.1",
-        "map-obj": "^4.0.0",
-        "quick-lru": "^4.0.1"
-      },
-      "engines": {
-        "node": ">=8"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
-    "packages/core/supabase-js/node_modules/hosted-git-info": {
-      "version": "4.1.0",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "lru-cache": "^6.0.0"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
-    "packages/core/supabase-js/node_modules/interpret": {
-      "version": "2.2.0",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.10"
-      }
-    },
-    "packages/core/supabase-js/node_modules/lru-cache": {
-      "version": "6.0.0",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "yallist": "^4.0.0"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
-    "packages/core/supabase-js/node_modules/meow": {
-      "version": "9.0.0",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@types/minimist": "^1.2.0",
-        "camelcase-keys": "^6.2.2",
-        "decamelize": "^1.2.0",
-        "decamelize-keys": "^1.1.0",
-        "hard-rejection": "^2.1.0",
-        "minimist-options": "4.1.0",
-        "normalize-package-data": "^3.0.0",
-        "read-pkg-up": "^7.0.1",
-        "redent": "^3.0.0",
-        "trim-newlines": "^3.0.0",
-        "type-fest": "^0.18.0",
-        "yargs-parser": "^20.2.3"
-      },
-      "engines": {
-        "node": ">=10"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
-    "packages/core/supabase-js/node_modules/meow/node_modules/type-fest": {
-      "version": "0.18.1",
-      "dev": true,
-      "license": "(MIT OR CC0-1.0)",
-      "engines": {
-        "node": ">=10"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
-    "packages/core/supabase-js/node_modules/meow/node_modules/yargs-parser": {
-      "version": "20.2.9",
-      "dev": true,
-      "license": "ISC",
-      "engines": {
-        "node": ">=10"
-      }
-    },
-    "packages/core/supabase-js/node_modules/normalize-package-data": {
-      "version": "3.0.3",
-      "dev": true,
-      "license": "BSD-2-Clause",
-      "dependencies": {
-        "hosted-git-info": "^4.0.1",
-        "is-core-module": "^2.5.0",
-        "semver": "^7.3.4",
-        "validate-npm-package-license": "^3.0.1"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
-    "packages/core/supabase-js/node_modules/quick-lru": {
-      "version": "4.0.1",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "packages/core/supabase-js/node_modules/read-pkg": {
-      "version": "5.2.0",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@types/normalize-package-data": "^2.4.0",
-        "normalize-package-data": "^2.5.0",
-        "parse-json": "^5.0.0",
-        "type-fest": "^0.6.0"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "packages/core/supabase-js/node_modules/read-pkg-up": {
-      "version": "7.0.1",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "find-up": "^4.1.0",
-        "read-pkg": "^5.2.0",
-        "type-fest": "^0.8.1"
-      },
-      "engines": {
-        "node": ">=8"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
-    "packages/core/supabase-js/node_modules/read-pkg-up/node_modules/type-fest": {
-      "version": "0.8.1",
-      "dev": true,
-      "license": "(MIT OR CC0-1.0)",
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "packages/core/supabase-js/node_modules/read-pkg/node_modules/hosted-git-info": {
-      "version": "2.8.9",
-      "dev": true,
-      "license": "ISC"
-    },
-    "packages/core/supabase-js/node_modules/read-pkg/node_modules/normalize-package-data": {
-      "version": "2.5.0",
-      "dev": true,
-      "license": "BSD-2-Clause",
-      "dependencies": {
-        "hosted-git-info": "^2.1.4",
-        "resolve": "^1.10.0",
-        "semver": "2 || 3 || 4 || 5",
-        "validate-npm-package-license": "^3.0.1"
-      }
-    },
-    "packages/core/supabase-js/node_modules/read-pkg/node_modules/semver": {
-      "version": "5.7.2",
-      "dev": true,
-      "license": "ISC",
-      "bin": {
-        "semver": "bin/semver"
-      }
-    },
-    "packages/core/supabase-js/node_modules/read-pkg/node_modules/type-fest": {
-      "version": "0.6.0",
-      "dev": true,
-      "license": "(MIT OR CC0-1.0)",
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "packages/core/supabase-js/node_modules/rechoir": {
-      "version": "0.7.1",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "resolve": "^1.9.0"
-      },
-      "engines": {
-        "node": ">= 0.10"
-      }
-    },
-    "packages/core/supabase-js/node_modules/redent": {
-      "version": "3.0.0",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "indent-string": "^4.0.0",
-        "strip-indent": "^3.0.0"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "packages/core/supabase-js/node_modules/strip-indent": {
-      "version": "3.0.0",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "min-indent": "^1.0.0"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "packages/core/supabase-js/node_modules/trim-newlines": {
-      "version": "3.0.1",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "packages/core/supabase-js/node_modules/tsd": {
-      "version": "0.30.7",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@tsd/typescript": "~5.3.3",
-        "eslint-formatter-pretty": "^4.1.0",
-        "globby": "^11.0.1",
-        "jest-diff": "^29.0.3",
-        "meow": "^9.0.0",
-        "path-exists": "^4.0.0",
-        "read-pkg-up": "^7.0.0"
-      },
-      "bin": {
-        "tsd": "dist/cli.js"
-      },
-      "engines": {
-        "node": ">=14.16"
-      }
-    },
-    "packages/core/supabase-js/node_modules/webpack-cli": {
-      "version": "4.10.0",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@discoveryjs/json-ext": "^0.5.0",
-        "@webpack-cli/configtest": "^1.2.0",
-        "@webpack-cli/info": "^1.5.0",
-        "@webpack-cli/serve": "^1.7.0",
-        "colorette": "^2.0.14",
-        "commander": "^7.0.0",
-        "cross-spawn": "^7.0.3",
-        "fastest-levenshtein": "^1.0.12",
-        "import-local": "^3.0.2",
-        "interpret": "^2.2.0",
-        "rechoir": "^0.7.0",
-        "webpack-merge": "^5.7.3"
-      },
-      "bin": {
-        "webpack-cli": "bin/cli.js"
-      },
-      "engines": {
-        "node": ">=10.13.0"
-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/webpack"
-      },
-      "peerDependencies": {
-        "webpack": "4.x.x || 5.x.x"
-      },
-      "peerDependenciesMeta": {
-        "@webpack-cli/generators": {
-          "optional": true
-        },
-        "@webpack-cli/migrate": {
-          "optional": true
-        },
-        "webpack-bundle-analyzer": {
-          "optional": true
-        },
-        "webpack-dev-server": {
-          "optional": true
-        }
-      }
-    },
-    "packages/core/supabase-js/node_modules/yallist": {
-      "version": "4.0.0",
-      "dev": true,
-      "license": "ISC"
     }
   }
 }
diff --git a/package.json b/package.json
index 7044b9d36..ae787bb50 100644
--- a/package.json
+++ b/package.json
@@ -19,6 +19,7 @@
   },
   "private": true,
   "devDependencies": {
+    "@arethetypeswrong/cli": "^0.18.2",
     "@commitlint/cli": "^19.8.1",
     "@commitlint/config-conventional": "^19.8.1",
     "@commitlint/cz-commitlint": "^19.8.1",
@@ -59,6 +60,7 @@
     "prettier": "^3.6.2",
     "ts-jest": "^29.4.2",
     "ts-node": "^10.9.1",
+    "tsdown": "^0.18.0",
     "tslib": "^2.3.0",
     "typedoc": "^0.27.9",
     "typescript": "~5.8.3",
diff --git a/packages/core/postgrest-js/package.json b/packages/core/postgrest-js/package.json
index e8ebfe94d..18c116375 100644
--- a/packages/core/postgrest-js/package.json
+++ b/packages/core/postgrest-js/package.json
@@ -14,38 +14,40 @@
     "dist",
     "src"
   ],
-  "main": "dist/cjs/index.js",
-  "module": "dist/esm/wrapper.mjs",
+  "main": "dist/index.cjs",
+  "module": "dist/index.mjs",
+  "types": "dist/index.d.cts",
   "exports": {
-    "import": {
-      "types": "./dist/cjs/index.d.ts",
-      "default": "./dist/esm/wrapper.mjs"
+    ".": {
+      "import": {
+        "types": "./dist/index.d.mts",
+        "default": "./dist/index.mjs"
+      },
+      "require": {
+        "types": "./dist/index.d.cts",
+        "default": "./dist/index.cjs"
+      }
     },
-    "require": {
-      "types": "./dist/cjs/index.d.ts",
-      "default": "./dist/cjs/index.js"
-    }
+    "./dist/*": "./dist/*",
+    "./package.json": "./package.json"
   },
-  "types": "./dist/cjs/index.d.ts",
   "repository": {
     "type": "git",
     "url": "https://github.com/supabase/supabase-js.git",
     "directory": "packages/core/postgrest-js"
   },
   "scripts": {
-    "build": "npm run build:cjs && npm run build:esm",
+    "build": "tsdown",
+    "build:watch": "tsdown --watch",
     "format": "node scripts/format.js",
     "format:check": "node scripts/format.js check",
-    "build:cjs": "tsc -p tsconfig.json",
-    "build:esm": "node scripts/copy-wrapper.cjs",
-    "build:module": "npm run build:cjs",
     "docs": "typedoc src/index.ts --out docs/v2",
     "docs:json": "typedoc --json docs/v2/spec.json --excludeExternals src/index.ts",
     "test:ci:postgrest": "npm run db:clean && npm run db:run && npm run test:run && npm run db:clean && npm run test:smoke",
     "test:run": "jest --runInBand --coverage -u",
     "test:smoke": "node test/smoke.cjs && node test/smoke.mjs",
     "test:update": "npm run db:clean && npm run db:run && npm run db:generate-test-types && jest --runInBand --updateSnapshot && npm run db:clean",
-    "test:types": "npm run build && tstyche",
+    "test:types": "tstyche",
     "test:types:ci": "tstyche --target '4.7,5.5,latest'",
     "test:types:watch": "chokidar 'src/**/*.ts' 'test/**/*.ts' -c 'npm run test:types'",
     "type-check": "tsc --noEmit --project tsconfig.json",
diff --git a/packages/core/postgrest-js/scripts/copy-wrapper.cjs b/packages/core/postgrest-js/scripts/copy-wrapper.cjs
deleted file mode 100644
index 9c4939081..000000000
--- a/packages/core/postgrest-js/scripts/copy-wrapper.cjs
+++ /dev/null
@@ -1,9 +0,0 @@
-const fs = require('fs')
-const path = require('path')
-
-const src = path.join(__dirname, '..', 'wrapper.mjs')
-const destDir = path.join(__dirname, '..', 'dist', 'esm')
-const dest = path.join(destDir, 'wrapper.mjs')
-
-fs.mkdirSync(destDir, { recursive: true })
-fs.copyFileSync(src, dest)
diff --git a/packages/core/postgrest-js/tsdown.config.ts b/packages/core/postgrest-js/tsdown.config.ts
new file mode 100644
index 000000000..c19358fbb
--- /dev/null
+++ b/packages/core/postgrest-js/tsdown.config.ts
@@ -0,0 +1,14 @@
+import { defineConfig } from 'tsdown'
+
+export default defineConfig({
+  entry: ['src/index.ts'],
+  format: ['cjs', 'esm'],
+  dts: true,
+  sourcemap: true,
+  clean: true,
+  outDir: 'dist',
+  external: ['tslib'],
+  fixedExtension: true,
+  hash: false,
+  target: 'es2017',
+})
diff --git a/packages/core/postgrest-js/wrapper.mjs b/packages/core/postgrest-js/wrapper.mjs
deleted file mode 100644
index 4f5b8da84..000000000
--- a/packages/core/postgrest-js/wrapper.mjs
+++ /dev/null
@@ -1,28 +0,0 @@
-import * as index from '../cjs/index.js'
-const {
-  PostgrestClient,
-  PostgrestQueryBuilder,
-  PostgrestFilterBuilder,
-  PostgrestTransformBuilder,
-  PostgrestBuilder,
-  PostgrestError,
-} = index.default || index
-
-export {
-  PostgrestBuilder,
-  PostgrestClient,
-  PostgrestFilterBuilder,
-  PostgrestQueryBuilder,
-  PostgrestTransformBuilder,
-  PostgrestError,
-}
-
-// compatibility with CJS output
-export default {
-  PostgrestClient,
-  PostgrestQueryBuilder,
-  PostgrestFilterBuilder,
-  PostgrestTransformBuilder,
-  PostgrestBuilder,
-  PostgrestError,
-}
diff --git a/packages/core/realtime-js/example/package-lock.json b/packages/core/realtime-js/example/package-lock.json
index efa32fbcc..fc1a54bdb 100644
--- a/packages/core/realtime-js/example/package-lock.json
+++ b/packages/core/realtime-js/example/package-lock.json
@@ -31,7 +31,6 @@
         "ws": "^8.18.2"
       },
       "devDependencies": {
-        "@arethetypeswrong/cli": "^0.16.4",
         "@vitest/coverage-v8": "^3.1.4",
         "esm": "^3.2.25",
         "jsdom": "^16.7.0",
diff --git a/packages/core/realtime-js/package.json b/packages/core/realtime-js/package.json
index 721b2edee..4e360d499 100644
--- a/packages/core/realtime-js/package.json
+++ b/packages/core/realtime-js/package.json
@@ -46,7 +46,6 @@
     "ws": "^8.18.2"
   },
   "devDependencies": {
-    "@arethetypeswrong/cli": "^0.16.4",
     "@vitest/coverage-v8": "^3.1.4",
     "esm": "^3.2.25",
     "jsdom": "^16.7.0",
diff --git a/packages/core/storage-js/README.md b/packages/core/storage-js/README.md
index a76629de8..866c35ad1 100644
--- a/packages/core/storage-js/README.md
+++ b/packages/core/storage-js/README.md
@@ -1157,121 +1157,17 @@ This package is part of the [Supabase JavaScript monorepo](https://github.com/su
 
 #### Build Scripts Overview
 
-The storage-js package uses multiple build scripts to generate different module formats for various JavaScript environments:
-
-| Script         | Description                 | Output                                                          |
-| -------------- | --------------------------- | --------------------------------------------------------------- |
-| `build`        | **Complete build pipeline** | Runs all build steps in sequence                                |
-| `build:main`   | **CommonJS build**          | `dist/main/` - Node.js compatible CommonJS modules              |
-| `build:module` | **ES Modules build**        | `dist/module/` - Modern ES6 modules with TypeScript definitions |
-| `build:umd`    | **UMD build**               | `dist/umd/` - Universal Module Definition for browsers/CDN      |
-| `clean`        | **Clean build artifacts**   | Removes `dist/` and `docs/v2/` directories                      |
-
-#### Running Builds
-
-##### Complete Build (Recommended)
-
 ```bash
-# From the monorepo root
+# Build the package
 npx nx build storage-js
-```
 
-This command executes the full build pipeline:
-
-1. **Cleans** - Removes any existing build artifacts
-2. **Formats** - Ensures consistent code formatting
-3. **Builds CommonJS** - For Node.js environments (`dist/main/`)
-4. **Builds ES Modules** - For modern bundlers (`dist/module/`)
-5. **Builds UMD** - For browser script tags (`dist/umd/`)
-
-##### Development Build with Watch Mode
-
-```bash
-# Continuously rebuild on file changes (from monorepo root)
+# Watch mode for development
 npx nx build storage-js --watch
-```
-
-##### Individual Build Targets
-
-For specific build outputs during development:
-
-```bash
-# Build CommonJS only (Node.js)
-npx nx build:main storage-js
-
-# Build ES Modules only (Modern bundlers)
-npx nx build:module storage-js
-
-# Build UMD only (Browser/CDN)
-npx nx build:umd storage-js
-```
-
-##### Other Useful Commands
-
-```bash
-# Clean build artifacts
-npx nx clean storage-js
-
-# Format code
-npx nx format storage-js
-
-# Type checking
-npx nx typecheck storage-js
 
 # Generate documentation
 npx nx docs storage-js
 ```
 
-#### Build Outputs Explained
-
-##### CommonJS (`dist/main/`)
-
-- **Used by:** Node.js applications, older build tools
-- **Entry point:** `dist/main/index.js`
-- **Module format:** `require()` and `module.exports`
-- **TypeScript definitions:** Included
-
-##### ES Modules (`dist/module/`)
-
-- **Used by:** Modern bundlers (Webpack, Rollup, Vite)
-- **Entry point:** `dist/module/index.js`
-- **Module format:** `import` and `export`
-- **TypeScript definitions:** `dist/module/index.d.ts`
-- **Benefits:** Tree-shaking, better static analysis
-
-##### UMD (`dist/umd/`)
-
-- **Used by:** Browser `<script>` tags, CDNs
-- **Entry point:** `dist/umd/supabase.js`
-- **Global variable:** `window.supabase`
-- **Size:** Larger (includes all dependencies)
-- **Usage example:**
-  ```html
-  <script src="https://unpkg.com/@supabase/storage-js/dist/umd/supabase.js"></script>
-  <script>
-    const { StorageClient } = window.supabase
-  </script>
-  ```
-
-#### Package Exports
-
-The package.json exports are configured to provide the right format for each environment:
-
-```json
-{
-  "main": "dist/main/index.js",
-  "module": "dist/module/index.js",
-  "types": "dist/module/index.d.ts",
-  "jsdelivr": "dist/umd/supabase.js",
-  "unpkg": "dist/umd/supabase.js"
-}
-```
-
-- **main** → Node.js environments (CommonJS format)
-- **module** → Modern bundlers like Webpack, Vite, Rollup (ES Modules)
-- **types** → TypeScript type definitions
-- **jsdelivr/unpkg** → CDN usage via `<script>` tags (UMD format)
-
 ### Testing
 
 **Important:** The storage-js tests require a local test infrastructure running in Docker. This is **NOT** the same as a regular Supabase instance - it's a specialized test setup with its own storage API, database, and Kong gateway.
diff --git a/packages/core/storage-js/package.json b/packages/core/storage-js/package.json
index 19a6a2b41..76dd269b0 100644
--- a/packages/core/storage-js/package.json
+++ b/packages/core/storage-js/package.json
@@ -15,9 +15,23 @@
     "dist",
     "src"
   ],
-  "main": "dist/main/index.js",
-  "module": "dist/module/index.js",
-  "types": "dist/module/index.d.ts",
+  "main": "dist/index.cjs",
+  "module": "dist/index.mjs",
+  "types": "dist/index.d.cts",
+  "exports": {
+    ".": {
+      "import": {
+        "types": "./dist/index.d.mts",
+        "default": "./dist/index.mjs"
+      },
+      "require": {
+        "types": "./dist/index.d.cts",
+        "default": "./dist/index.cjs"
+      }
+    },
+    "./dist/*": "./dist/*",
+    "./package.json": "./package.json"
+  },
   "sideEffects": false,
   "repository": {
     "type": "git",
@@ -25,10 +39,8 @@
     "directory": "packages/core/storage-js"
   },
   "scripts": {
-    "build": "npm run build:main && npm run build:module && npm run build:umd",
-    "build:main": "tsc -p tsconfig.json",
-    "build:module": "tsc -p tsconfig.module.json",
-    "build:umd": "webpack",
+    "build": "tsdown",
+    "build:watch": "tsdown --watch",
     "test:storage": "npx nx test:clean storage-js && npx nx test:infra storage-js && npx nx test:suite storage-js && npx nx test:clean storage-js",
     "test:suite": "jest --runInBand --coverage",
     "test:infra": "cd infra && docker compose down && docker compose up -d --build && sleep 10",
@@ -41,10 +53,7 @@
     "tslib": "2.8.1"
   },
   "devDependencies": {
-    "form-data": "^4.0.0",
-    "ts-loader": "^9.4.2",
-    "webpack": "^5.75.0",
-    "webpack-cli": "^5.0.1"
+    "form-data": "^4.0.0"
   },
   "jsdelivr": "dist/umd/supabase.js",
   "unpkg": "dist/umd/supabase.js",
diff --git a/packages/core/storage-js/tsconfig.module.json b/packages/core/storage-js/tsconfig.module.json
deleted file mode 100644
index 65a348eb4..000000000
--- a/packages/core/storage-js/tsconfig.module.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "extends": "./tsconfig.lib.json",
-  "compilerOptions": {
-    "module": "ES2020",
-    "outDir": "./dist/module"
-  }
-}
diff --git a/packages/core/storage-js/tsdown.config.ts b/packages/core/storage-js/tsdown.config.ts
new file mode 100644
index 000000000..2a0c57442
--- /dev/null
+++ b/packages/core/storage-js/tsdown.config.ts
@@ -0,0 +1,32 @@
+import { defineConfig } from 'tsdown'
+
+export default defineConfig([
+  // CJS and ESM builds
+  {
+    entry: ['src/index.ts'],
+    format: ['cjs', 'esm'],
+    dts: true,
+    sourcemap: true,
+    clean: true,
+    outDir: 'dist',
+    external: ['iceberg-js'],
+    fixedExtension: true,
+    hash: false,
+    target: 'es2017',
+  },
+  // IIFE build for CDN (jsdelivr/unpkg)
+  {
+    entry: { supabase: 'src/index.ts' },
+    format: ['iife'],
+    globalName: 'supabase',
+    outDir: 'dist/umd',
+    noExternal: [/.*/],
+    minify: true,
+    platform: 'browser',
+    // Rename to supabase.js for backward compatibility (can remove in v3)
+    onSuccess: async () => {
+      const { rename } = await import('fs/promises')
+      await rename('dist/umd/supabase.iife.js', 'dist/umd/supabase.js')
+    },
+  },
+])
diff --git a/packages/core/storage-js/webpack.config.js b/packages/core/storage-js/webpack.config.js
deleted file mode 100644
index a9653327d..000000000
--- a/packages/core/storage-js/webpack.config.js
+++ /dev/null
@@ -1,39 +0,0 @@
-const webpack = require('webpack')
-const path = require('path')
-
-module.exports = {
-  entry: './src/index.ts',
-  output: {
-    path: path.resolve(__dirname, 'dist/umd'),
-    filename: 'supabase.js',
-    library: {
-      type: 'umd',
-      name: 'supabase',
-    },
-  },
-  module: {
-    rules: [
-      {
-        test: /\.ts$/,
-        loader: 'ts-loader',
-        options: {
-          transpileOnly: true,
-        },
-      },
-      {
-        test: /\.m?js$/,
-        resolve: {
-          fullySpecified: false,
-        },
-      },
-    ],
-  },
-  resolve: {
-    extensions: ['.ts', '.js', '.json'],
-  },
-  plugins: [
-    new webpack.DefinePlugin({
-      process: 'process/browser',
-    }),
-  ],
-}
diff --git a/packages/core/supabase-js/package.json b/packages/core/supabase-js/package.json
index 8aa1557df..a46ee6b84 100644
--- a/packages/core/supabase-js/package.json
+++ b/packages/core/supabase-js/package.json
@@ -15,16 +15,21 @@
     "dist",
     "src"
   ],
-  "main": "dist/main/index.js",
-  "module": "dist/esm/wrapper.mjs",
-  "types": "dist/module/index.d.ts",
+  "main": "dist/index.cjs",
+  "module": "dist/index.mjs",
+  "types": "dist/index.d.cts",
   "exports": {
     ".": {
-      "types": "./dist/module/index.d.ts",
-      "import": "./dist/esm/wrapper.mjs",
-      "require": "./dist/main/index.js"
+      "import": {
+        "types": "./dist/index.d.mts",
+        "default": "./dist/index.mjs"
+      },
+      "require": {
+        "types": "./dist/index.d.cts",
+        "default": "./dist/index.cjs"
+      }
     },
-    "./dist/module/*": "./dist/module/*",
+    "./dist/*": "./dist/*",
     "./package.json": "./package.json"
   },
   "sideEffects": false,
@@ -34,11 +39,8 @@
     "directory": "packages/core/supabase-js"
   },
   "scripts": {
-    "build": "npm run build:main && npm run build:module && npm run build:esm && npm run build:umd",
-    "build:main": "tsc -p tsconfig.json",
-    "build:module": "tsc -p tsconfig.module.json && node scripts/fix-esm-extensions.cjs",
-    "build:esm": "node scripts/copy-wrapper.cjs",
-    "build:umd": "webpack --env mode=production",
+    "build": "tsdown",
+    "build:watch": "tsdown --watch",
     "test": "npm run test:types && npm run test:run",
     "test:all": "npm run test:types && npm run test:run && npm run test:integration && npm run test:integration:browser",
     "test:run": "jest --runInBand --detectOpenHandles",
@@ -54,6 +56,10 @@
     "test:expo": "cd test/integration/expo && npm test",
     "test:next": "cd test/integration/next && npm test",
     "test:types": "tsd --files test/types/*.test-d.ts && jsr publish --dry-run --allow-dirty",
+    "test:exports": "attw --pack .",
+    "test:esm": "node test/module-resolution.test.mjs",
+    "test:cjs": "node test/module-resolution.test.cjs",
+    "test:module-resolution": "npm run test:exports && npm run test:esm && npm run test:cjs",
     "docs": "typedoc --entryPoints src/index.ts --out docs/v2",
     "docs:json": "typedoc --entryPoints src/index.ts --json docs/v2/spec.json --excludeExternals",
     "serve:coverage": "npx nx test:coverage supabase-js && serve test/coverage",
@@ -74,10 +80,7 @@
     "jsr": "^0.13.5",
     "puppeteer": "^24.9.0",
     "serve": "^14.2.1",
-    "ts-loader": "^9.5.4",
-    "tsd": "^0.30.4",
-    "webpack": "^5.69.1",
-    "webpack-cli": "^4.9.2"
+    "tsd": "^0.33.0"
   },
   "jsdelivr": "dist/umd/supabase.js",
   "unpkg": "dist/umd/supabase.js",
diff --git a/packages/core/supabase-js/scripts/copy-wrapper.cjs b/packages/core/supabase-js/scripts/copy-wrapper.cjs
deleted file mode 100644
index 9c4939081..000000000
--- a/packages/core/supabase-js/scripts/copy-wrapper.cjs
+++ /dev/null
@@ -1,9 +0,0 @@
-const fs = require('fs')
-const path = require('path')
-
-const src = path.join(__dirname, '..', 'wrapper.mjs')
-const destDir = path.join(__dirname, '..', 'dist', 'esm')
-const dest = path.join(destDir, 'wrapper.mjs')
-
-fs.mkdirSync(destDir, { recursive: true })
-fs.copyFileSync(src, dest)
diff --git a/packages/core/supabase-js/scripts/fix-esm-extensions.cjs b/packages/core/supabase-js/scripts/fix-esm-extensions.cjs
deleted file mode 100644
index c340b6160..000000000
--- a/packages/core/supabase-js/scripts/fix-esm-extensions.cjs
+++ /dev/null
@@ -1,37 +0,0 @@
-/**
- * Post-build script to add .js extensions to relative imports in ESM output.
- *
- * Node.js ESM requires explicit file extensions for relative imports.
- * TypeScript doesn't add these by default, so we add them after compilation.
- *
- * This fixes:
- * - Node.js direct ESM imports (import { createClient } from '@supabase/supabase-js')
- * - jsDelivr CDN ESM imports (when bundled with the module build)
- */
-const fs = require('fs')
-const path = require('path')
-
-function addJsExtensions(dir) {
-  const files = fs.readdirSync(dir, { withFileTypes: true })
-  for (const file of files) {
-    const fullPath = path.join(dir, file.name)
-    if (file.isDirectory()) {
-      addJsExtensions(fullPath)
-    } else if (file.name.endsWith('.js')) {
-      let content = fs.readFileSync(fullPath, 'utf8')
-      // Add .js to relative imports that don't already have an extension
-      // Matches: from './foo' or from '../foo/bar' but not from './foo.js'
-      content = content.replace(/(from\s+['"])(\.\.?\/[^'"]+)(?<!\.js)(['"])/g, '$1$2.js$3')
-      fs.writeFileSync(fullPath, content)
-    }
-  }
-}
-
-const targetDir = path.resolve(__dirname, '../dist/module')
-if (fs.existsSync(targetDir)) {
-  addJsExtensions(targetDir)
-  console.log('✓ Added .js extensions to ESM imports in dist/module/')
-} else {
-  console.error('Error: dist/module directory not found')
-  process.exit(1)
-}
diff --git a/packages/core/supabase-js/test/deno/edge-functions-integration.test.ts b/packages/core/supabase-js/test/deno/edge-functions-integration.test.ts
index 183623fa7..b9a658043 100644
--- a/packages/core/supabase-js/test/deno/edge-functions-integration.test.ts
+++ b/packages/core/supabase-js/test/deno/edge-functions-integration.test.ts
@@ -1,6 +1,6 @@
 import 'node:buffer'
 import { assertEquals, assertExists } from 'https://deno.land/std@0.220.1/assert/mod.ts'
-import { createClient } from '../../dist/module/index.js'
+import { createClient } from '../../dist/index.mjs'
 
 // These tests are for integration testing with actual deployed edge functions
 // To run these tests, you need to:
diff --git a/packages/core/supabase-js/test/deno/integration.test.ts b/packages/core/supabase-js/test/deno/integration.test.ts
index 853f17b44..7c6f4ea6d 100644
--- a/packages/core/supabase-js/test/deno/integration.test.ts
+++ b/packages/core/supabase-js/test/deno/integration.test.ts
@@ -1,7 +1,7 @@
 import 'node:buffer'
 import { assertEquals, assertExists } from 'https://deno.land/std@0.220.1/assert/mod.ts'
-import { createClient, SupabaseClient } from '../../dist/module/index.js'
-import type { RealtimeChannel } from '../../dist/module/index.js'
+import { createClient, SupabaseClient } from '../../dist/index.mjs'
+import type { RealtimeChannel } from '../../dist/index.mjs'
 
 // These tests assume that a local Supabase server is already running
 // Start a local Supabase instance with 'supabase start' before running these tests
diff --git a/packages/core/supabase-js/test/deno/setup-deps.js b/packages/core/supabase-js/test/deno/setup-deps.js
index e5971cd43..f6961bbf7 100755
--- a/packages/core/supabase-js/test/deno/setup-deps.js
+++ b/packages/core/supabase-js/test/deno/setup-deps.js
@@ -49,7 +49,7 @@ denoJson.imports = {
   '@supabase/functions-js': `npm:@supabase/functions-js@${versions.functions}`,
   '@supabase/postgrest-js': `npm:@supabase/postgrest-js@${versions.postgrest}`,
   '@supabase/auth-js': `npm:@supabase/auth-js@${versions.auth}`,
-  '@supabase/storage-js': `npm:@supabase/storage-js@${versions.storage}/dist/module/index.js`,
+  '@supabase/storage-js': `npm:@supabase/storage-js@${versions.storage}`,
 }
 
 // Ensure Node types are available for Deno type-checking of .d.ts files
diff --git a/packages/core/supabase-js/test/integration.browser.test.ts b/packages/core/supabase-js/test/integration.browser.test.ts
index 418cf95e9..bdb5a0473 100644
--- a/packages/core/supabase-js/test/integration.browser.test.ts
+++ b/packages/core/supabase-js/test/integration.browser.test.ts
@@ -93,7 +93,7 @@ beforeAll(async () => {
   await new Deno.Command('supabase', { args: ['start'], stderr }).output()
   await new Deno.Command('npm', { args: ['install'], stderr }).output()
   await new Deno.Command('npm', {
-    args: ['run', 'build:umd', '--', '--mode', 'production'],
+    args: ['run', 'build'],
     stderr,
   }).output()
 
diff --git a/packages/core/supabase-js/test/integration/next/package.json b/packages/core/supabase-js/test/integration/next/package.json
index 02f46f779..fdd3fac18 100644
--- a/packages/core/supabase-js/test/integration/next/package.json
+++ b/packages/core/supabase-js/test/integration/next/package.json
@@ -9,7 +9,7 @@
     "test": "playwright test",
     "test:ui": "playwright test --ui",
     "test:debug": "playwright test --debug",
-    "test:types": "npx tsd --files tests/types/*.test-d.ts"
+    "test:types": "tsd --files tests/types/*.test-d.ts"
   },
   "dependencies": {
     "@radix-ui/react-checkbox": "^1.3.1",
diff --git a/packages/core/supabase-js/test/integration/node-browser/index.html b/packages/core/supabase-js/test/integration/node-browser/index.html
index f10f18daf..320ee2634 100644
--- a/packages/core/supabase-js/test/integration/node-browser/index.html
+++ b/packages/core/supabase-js/test/integration/node-browser/index.html
@@ -81,6 +81,19 @@
           return originalSetInterval.apply(this, [fn, delay, ...args])
         }
 
+        // Verify all clients are bundled (catches AuthClient null bug from 2.86.1)
+        log('Verifying bundled clients...')
+        const testClient = createClient('https://example.supabase.co', 'test-key')
+        if (!testClient.auth) throw new Error('auth client missing (AuthClient null bug)')
+        if (typeof testClient.auth.signUp !== 'function') throw new Error('auth.signUp missing')
+        if (typeof testClient.auth.getSession !== 'function')
+          throw new Error('auth.getSession missing')
+        if (!testClient.storage) throw new Error('storage client missing')
+        if (!testClient.functions) throw new Error('functions client missing')
+        if (typeof testClient.from !== 'function') throw new Error('postgrest client missing')
+        if (typeof testClient.channel !== 'function') throw new Error('realtime client missing')
+        log('All clients bundled correctly')
+
         log('Creating Supabase client with WebSocket transport and vsn: ' + vsn + '...')
         const supabase = createClient(
           'http://127.0.0.1:54321',
diff --git a/packages/core/supabase-js/test/module-resolution.test.cjs b/packages/core/supabase-js/test/module-resolution.test.cjs
new file mode 100644
index 000000000..3fa4d250f
--- /dev/null
+++ b/packages/core/supabase-js/test/module-resolution.test.cjs
@@ -0,0 +1,70 @@
+/**
+ * Module Resolution Tests (CommonJS)
+ *
+ * Tests that the package works correctly when required via CommonJS.
+ * This catches issues like the wrapper.mjs bug that broke jsdelivr CDN imports.
+ *
+ * Run with: node test/module-resolution.test.cjs
+ */
+
+const assert = require('assert')
+
+console.log('Testing CommonJS require...\n')
+
+// Test 1: Main export works
+console.log('1. Testing main export...')
+const supabase = require('../dist/index.cjs')
+assert(supabase, 'Main export should exist')
+assert(typeof supabase.createClient === 'function', 'createClient should be a function')
+console.log('   ✅ Main export works\n')
+
+// Test 2: createClient works
+console.log('2. Testing createClient...')
+const { createClient } = supabase
+const client = createClient('https://example.supabase.co', 'test-key')
+assert(client, 'Client should be created')
+console.log('   ✅ createClient works\n')
+
+// Test 3: Auth client exists and has methods
+console.log('3. Testing Auth client...')
+assert(client.auth, 'client.auth should exist')
+assert(typeof client.auth.signUp === 'function', 'auth.signUp should be a function')
+assert(
+  typeof client.auth.signInWithPassword === 'function',
+  'auth.signInWithPassword should be a function'
+)
+assert(typeof client.auth.signOut === 'function', 'auth.signOut should be a function')
+assert(typeof client.auth.getSession === 'function', 'auth.getSession should be a function')
+assert(typeof client.auth.getUser === 'function', 'auth.getUser should be a function')
+assert(
+  typeof client.auth.onAuthStateChange === 'function',
+  'auth.onAuthStateChange should be a function'
+)
+console.log('   ✅ Auth client works\n')
+
+// Test 4: PostgREST client exists
+console.log('4. Testing PostgREST client...')
+assert(typeof client.from === 'function', 'client.from should be a function')
+const query = client.from('test')
+assert(query, 'from() should return a query builder')
+console.log('   ✅ PostgREST client works\n')
+
+// Test 5: Storage client exists
+console.log('5. Testing Storage client...')
+assert(client.storage, 'client.storage should exist')
+assert(typeof client.storage.from === 'function', 'storage.from should be a function')
+console.log('   ✅ Storage client works\n')
+
+// Test 6: Functions client exists
+console.log('6. Testing Functions client...')
+assert(client.functions, 'client.functions should exist')
+assert(typeof client.functions.invoke === 'function', 'functions.invoke should be a function')
+console.log('   ✅ Functions client works\n')
+
+// Test 7: Realtime client exists
+console.log('7. Testing Realtime client...')
+assert(typeof client.channel === 'function', 'client.channel should be a function')
+assert(typeof client.removeChannel === 'function', 'client.removeChannel should be a function')
+console.log('   ✅ Realtime client works\n')
+
+console.log('🎉 All CommonJS tests passed!')
diff --git a/packages/core/supabase-js/test/module-resolution.test.mjs b/packages/core/supabase-js/test/module-resolution.test.mjs
new file mode 100644
index 000000000..ae2102f65
--- /dev/null
+++ b/packages/core/supabase-js/test/module-resolution.test.mjs
@@ -0,0 +1,76 @@
+/**
+ * Module Resolution Tests (ESM)
+ *
+ * Tests that the package works correctly when imported via ESM.
+ * This catches issues like the wrapper.mjs bug that broke jsdelivr CDN imports.
+ *
+ * Run with: node test/module-resolution.test.mjs
+ */
+
+import assert from 'assert'
+
+console.log('Testing ESM import...\n')
+
+// Test 1: Named exports work
+console.log('1. Testing named exports...')
+const { createClient } = await import('../dist/index.mjs')
+assert(typeof createClient === 'function', 'createClient should be a function')
+console.log('   ✅ Named exports work\n')
+
+// Test 2: createClient works
+console.log('2. Testing createClient...')
+const client = createClient('https://example.supabase.co', 'test-key')
+assert(client, 'Client should be created')
+console.log('   ✅ createClient works\n')
+
+// Test 3: Auth client exists and has methods (this is what broke in 2.86.1)
+console.log('3. Testing Auth client (AuthClient null bug check)...')
+assert(client.auth, 'client.auth should exist (was null in 2.86.1 bug)')
+assert(typeof client.auth.signUp === 'function', 'auth.signUp should be a function')
+assert(
+  typeof client.auth.signInWithPassword === 'function',
+  'auth.signInWithPassword should be a function'
+)
+assert(typeof client.auth.signOut === 'function', 'auth.signOut should be a function')
+assert(typeof client.auth.getSession === 'function', 'auth.getSession should be a function')
+assert(typeof client.auth.getUser === 'function', 'auth.getUser should be a function')
+assert(
+  typeof client.auth.onAuthStateChange === 'function',
+  'auth.onAuthStateChange should be a function'
+)
+console.log('   ✅ Auth client works (no AuthClient null bug)\n')
+
+// Test 4: PostgREST client exists
+console.log('4. Testing PostgREST client...')
+assert(typeof client.from === 'function', 'client.from should be a function')
+const query = client.from('test')
+assert(query, 'from() should return a query builder')
+console.log('   ✅ PostgREST client works\n')
+
+// Test 5: Storage client exists
+console.log('5. Testing Storage client...')
+assert(client.storage, 'client.storage should exist')
+assert(typeof client.storage.from === 'function', 'storage.from should be a function')
+console.log('   ✅ Storage client works\n')
+
+// Test 6: Functions client exists
+console.log('6. Testing Functions client...')
+assert(client.functions, 'client.functions should exist')
+assert(typeof client.functions.invoke === 'function', 'functions.invoke should be a function')
+console.log('   ✅ Functions client works\n')
+
+// Test 7: Realtime client exists
+console.log('7. Testing Realtime client...')
+assert(typeof client.channel === 'function', 'client.channel should be a function')
+assert(typeof client.removeChannel === 'function', 'client.removeChannel should be a function')
+console.log('   ✅ Realtime client works\n')
+
+// Test 8: Type exports (check they don't throw)
+console.log('8. Testing type re-exports...')
+const mod = await import('../dist/index.mjs')
+// These should all be importable without errors
+const exports = Object.keys(mod)
+assert(exports.includes('createClient'), 'Should export createClient')
+console.log(`   ✅ Module exports ${exports.length} items\n`)
+
+console.log('🎉 All ESM tests passed!')
diff --git a/packages/core/supabase-js/tsconfig.module.json b/packages/core/supabase-js/tsconfig.module.json
deleted file mode 100644
index 8726ca43b..000000000
--- a/packages/core/supabase-js/tsconfig.module.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "extends": "./tsconfig",
-  "compilerOptions": {
-    "module": "ES2020",
-    "outDir": "dist/module"
-  }
-}
diff --git a/packages/core/supabase-js/tsdown.config.ts b/packages/core/supabase-js/tsdown.config.ts
new file mode 100644
index 000000000..21e2d7cde
--- /dev/null
+++ b/packages/core/supabase-js/tsdown.config.ts
@@ -0,0 +1,40 @@
+import { defineConfig } from 'tsdown'
+
+export default defineConfig([
+  // CJS and ESM builds - keep @supabase/* external
+  {
+    entry: ['src/index.ts'],
+    format: ['cjs', 'esm'],
+    dts: true,
+    sourcemap: true,
+    clean: true,
+    outDir: 'dist',
+    // CRITICAL: Keep @supabase/* packages external - not bundled
+    external: [
+      '@supabase/auth-js',
+      '@supabase/functions-js',
+      '@supabase/postgrest-js',
+      '@supabase/realtime-js',
+      '@supabase/storage-js',
+    ],
+    fixedExtension: true,
+    hash: false,
+    target: 'es2017',
+  },
+  // IIFE build for CDN (jsdelivr/unpkg) - bundles EVERYTHING
+  {
+    entry: { supabase: 'src/index.ts' },
+    format: ['iife'],
+    globalName: 'supabase',
+    outDir: 'dist/umd',
+    // Bundle all dependencies including @supabase/*
+    noExternal: [/.*/],
+    minify: true,
+    platform: 'browser',
+    // Rename to supabase.js for backward compatibility (can remove in v3)
+    onSuccess: async () => {
+      const { rename } = await import('fs/promises')
+      await rename('dist/umd/supabase.iife.js', 'dist/umd/supabase.js')
+    },
+  },
+])
diff --git a/packages/core/supabase-js/webpack.config.js b/packages/core/supabase-js/webpack.config.js
deleted file mode 100644
index 857e44041..000000000
--- a/packages/core/supabase-js/webpack.config.js
+++ /dev/null
@@ -1,36 +0,0 @@
-const webpack = require('webpack')
-const path = require('path')
-
-module.exports = (env) => ({
-  mode: env?.mode || 'production',
-  entry: './src/index.ts',
-  output: {
-    path: path.resolve(__dirname, 'dist/umd'),
-    filename: 'supabase.js',
-    library: {
-      type: 'umd',
-      name: 'supabase',
-    },
-  },
-  module: {
-    rules: [
-      {
-        test: /\.ts$/,
-        loader: 'ts-loader',
-        options: {
-          transpileOnly: true,
-        },
-      },
-      {
-        test: /\.m?js$/,
-        resolve: {
-          fullySpecified: false,
-        },
-      },
-    ],
-  },
-  resolve: {
-    extensions: ['.ts', '.js', '.json'],
-  },
-  plugins: [],
-})
diff --git a/packages/core/supabase-js/wrapper.mjs b/packages/core/supabase-js/wrapper.mjs
deleted file mode 100644
index 74c9664a4..000000000
--- a/packages/core/supabase-js/wrapper.mjs
+++ /dev/null
@@ -1,94 +0,0 @@
-import * as index from '../module/index.js'
-const {
-  PostgrestError,
-  FunctionsHttpError,
-  FunctionsFetchError,
-  FunctionsRelayError,
-  FunctionsError,
-  FunctionRegion,
-  SupabaseClient,
-  createClient,
-  GoTrueAdminApi,
-  GoTrueClient,
-  AuthAdminApi,
-  AuthClient,
-  navigatorLock,
-  NavigatorLockAcquireTimeoutError,
-  lockInternals,
-  processLock,
-  SIGN_OUT_SCOPES,
-  AuthError,
-  AuthApiError,
-  AuthUnknownError,
-  CustomAuthError,
-  AuthSessionMissingError,
-  AuthInvalidTokenResponseError,
-  AuthInvalidCredentialsError,
-  AuthImplicitGrantRedirectError,
-  AuthPKCEGrantCodeExchangeError,
-  AuthRetryableFetchError,
-  AuthWeakPasswordError,
-  AuthInvalidJwtError,
-  isAuthError,
-  isAuthApiError,
-  isAuthSessionMissingError,
-  isAuthImplicitGrantRedirectError,
-  isAuthRetryableFetchError,
-  isAuthWeakPasswordError,
-  RealtimePresence,
-  RealtimeChannel,
-  RealtimeClient,
-  REALTIME_LISTEN_TYPES,
-  REALTIME_POSTGRES_CHANGES_LISTEN_EVENT,
-  REALTIME_PRESENCE_LISTEN_EVENTS,
-  REALTIME_SUBSCRIBE_STATES,
-  REALTIME_CHANNEL_STATES,
-} = index.default || index
-
-export {
-  PostgrestError,
-  FunctionsHttpError,
-  FunctionsFetchError,
-  FunctionsRelayError,
-  FunctionsError,
-  FunctionRegion,
-  SupabaseClient,
-  createClient,
-  GoTrueAdminApi,
-  GoTrueClient,
-  AuthAdminApi,
-  AuthClient,
-  navigatorLock,
-  NavigatorLockAcquireTimeoutError,
-  lockInternals,
-  processLock,
-  SIGN_OUT_SCOPES,
-  AuthError,
-  AuthApiError,
-  AuthUnknownError,
-  CustomAuthError,
-  AuthSessionMissingError,
-  AuthInvalidTokenResponseError,
-  AuthInvalidCredentialsError,
-  AuthImplicitGrantRedirectError,
-  AuthPKCEGrantCodeExchangeError,
-  AuthRetryableFetchError,
-  AuthWeakPasswordError,
-  AuthInvalidJwtError,
-  isAuthError,
-  isAuthApiError,
-  isAuthSessionMissingError,
-  isAuthImplicitGrantRedirectError,
-  isAuthRetryableFetchError,
-  isAuthWeakPasswordError,
-  RealtimePresence,
-  RealtimeChannel,
-  RealtimeClient,
-  REALTIME_LISTEN_TYPES,
-  REALTIME_POSTGRES_CHANGES_LISTEN_EVENT,
-  REALTIME_PRESENCE_LISTEN_EVENTS,
-  REALTIME_SUBSCRIBE_STATES,
-  REALTIME_CHANNEL_STATES,
-}
-
-export default index.default || index