diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 9f95205..30dfc5d 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -7,6 +7,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
+      - uses: mindstorm/setup-emsdk@v11
+
+      - run: emcc -v
+
       - uses: actions/checkout@v2
 
       - uses: actions/setup-node@v2
@@ -14,8 +18,12 @@ jobs:
           node-version: '16.x'
           registry-url: 'https://npm.pkg.github.com'
 
-      - run: yarn
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build package
+        run: ./build.sh package
 
-      - run: yarn publish
+      - run: npm publish
         env:
           NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..849db98
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,49 @@
+{
+  "name": "survex.js",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "isomorphic-unfetch": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/isomorphic-unfetch/-/isomorphic-unfetch-3.1.0.tgz",
+      "integrity": "sha512-geDJjpoZ8N0kWexiwkX8F9NkTsXhetLPVbZFQ+JTW239QNOwvB0gniuR1Wc6f0AMTn7/mFGyXvHTifrCp/GH8Q==",
+      "requires": {
+        "node-fetch": "^2.6.1",
+        "unfetch": "^4.2.0"
+      }
+    },
+    "node-fetch": {
+      "version": "2.6.6",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.6.tgz",
+      "integrity": "sha512-Z8/6vRlTUChSdIgMa51jxQ4lrw/Jy5SOW10ObaA47/RElsAN2c5Pn8bTgFGWn/ibwzXTE8qwr1Yzx28vsecXEA==",
+      "requires": {
+        "whatwg-url": "^5.0.0"
+      }
+    },
+    "tr46": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
+      "integrity": "sha1-gYT9NH2snNwYWZLzpmIuFLnZq2o="
+    },
+    "unfetch": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/unfetch/-/unfetch-4.2.0.tgz",
+      "integrity": "sha512-F9p7yYCn6cIW9El1zi0HI6vqpeIvBsr3dSuRO6Xuppb1u5rXpCPmMvLSyECLhybr9isec8Ohl0hPekMVrEinDA=="
+    },
+    "webidl-conversions": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
+      "integrity": "sha1-JFNCdeKnvGvnvIZhHMFq4KVlSHE="
+    },
+    "whatwg-url": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
+      "integrity": "sha1-lmRU6HZUYuN2RNNib2dCzotwll0=",
+      "requires": {
+        "tr46": "~0.0.3",
+        "webidl-conversions": "^3.0.0"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
index b3bd1ea..629c24f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "survex.js",
-  "version": "1.4.1.0",
+  "version": "1.0.0",
   "description": "Survex JS compatibility layer",
   "main": "index.js",
   "author": "Paul Walko <paulsw.pw@gmail.com>",
diff --git a/yarn.lock b/yarn.lock
deleted file mode 100644
index 9a5e00c..0000000
--- a/yarn.lock
+++ /dev/null
@@ -1,41 +0,0 @@
-# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
-# yarn lockfile v1
-
-
-isomorphic-unfetch@^3.1.0:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/isomorphic-unfetch/-/isomorphic-unfetch-3.1.0.tgz#87341d5f4f7b63843d468438128cb087b7c3e98f"
-  integrity sha512-geDJjpoZ8N0kWexiwkX8F9NkTsXhetLPVbZFQ+JTW239QNOwvB0gniuR1Wc6f0AMTn7/mFGyXvHTifrCp/GH8Q==
-  dependencies:
-    node-fetch "^2.6.1"
-    unfetch "^4.2.0"
-
-node-fetch@^2.6.1:
-  version "2.6.6"
-  resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.6.6.tgz#1751a7c01834e8e1697758732e9efb6eeadfaf89"
-  integrity sha512-Z8/6vRlTUChSdIgMa51jxQ4lrw/Jy5SOW10ObaA47/RElsAN2c5Pn8bTgFGWn/ibwzXTE8qwr1Yzx28vsecXEA==
-  dependencies:
-    whatwg-url "^5.0.0"
-
-tr46@~0.0.3:
-  version "0.0.3"
-  resolved "https://registry.yarnpkg.com/tr46/-/tr46-0.0.3.tgz#8184fd347dac9cdc185992f3a6622e14b9d9ab6a"
-  integrity sha1-gYT9NH2snNwYWZLzpmIuFLnZq2o=
-
-unfetch@^4.2.0:
-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/unfetch/-/unfetch-4.2.0.tgz#7e21b0ef7d363d8d9af0fb929a5555f6ef97a3be"
-  integrity sha512-F9p7yYCn6cIW9El1zi0HI6vqpeIvBsr3dSuRO6Xuppb1u5rXpCPmMvLSyECLhybr9isec8Ohl0hPekMVrEinDA==
-
-webidl-conversions@^3.0.0:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/webidl-conversions/-/webidl-conversions-3.0.1.tgz#24534275e2a7bc6be7bc86611cc16ae0a5654871"
-  integrity sha1-JFNCdeKnvGvnvIZhHMFq4KVlSHE=
-
-whatwg-url@^5.0.0:
-  version "5.0.0"
-  resolved "https://registry.yarnpkg.com/whatwg-url/-/whatwg-url-5.0.0.tgz#966454e8765462e37644d3626f6742ce8b70965d"
-  integrity sha1-lmRU6HZUYuN2RNNib2dCzotwll0=
-  dependencies:
-    tr46 "~0.0.3"
-    webidl-conversions "^3.0.0"