diff --git a/.gitignore b/.gitignore
index fa96d744..4a98b3c4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,3 +34,6 @@
 !/pkg/*/pnpm-lock.yaml
 !/pkg/*/tsconfig.json
 !/pkg/*/.npmignore
+
+# build script
+!/fixup.sh
diff --git a/.npmignore b/.npmignore
index b3fbb208..fa98df65 100644
--- a/.npmignore
+++ b/.npmignore
@@ -10,3 +10,4 @@
 !/build/cjs/src/**/*.js
 !/build/cjs/src/**/*.js.map
 !/build/cjs/src/**/*.d.ts
+!/build/cjs/package.json
diff --git a/fixup.sh b/fixup.sh
new file mode 100755
index 00000000..eb61ddd6
--- /dev/null
+++ b/fixup.sh
@@ -0,0 +1,9 @@
+#!/bin/env bash
+
+for f in pkg/*; do
+	cat <<EOF > ${f}/build/cjs/package.json
+{
+	"type": "commonjs"
+}
+EOF
+done
diff --git a/package.json b/package.json
index ba774c42..1634f247 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
 		"clean": "rm -rf .coverage && pnpm -F @slangroom/* exec -- rm -rf build",
 		"build": "pnpm build:esm",
 		"build:dual": "pnpm build:esm && pnpm build:cjs",
-		"build:cjs": "pnpm -F @slangroom/* exec tsc --outDir build/cjs --module commonjs",
+		"build:cjs": "pnpm -F @slangroom/* exec tsc --outDir build/cjs --module commonjs && ./fixup.sh",
 		"build:esm": "pnpm -F @slangroom/* exec tsc --outdir build/esm --module node16",
 		"build-all": "pnpm build"
 	},
diff --git a/pkg/shared/src/index.ts b/pkg/shared/src/index.ts
index daaa119f..bfcd998b 100644
--- a/pkg/shared/src/index.ts
+++ b/pkg/shared/src/index.ts
@@ -1,4 +1,3 @@
-export * from '@slangroom/shared/gen-types';
 export * from '@slangroom/shared/jsonable';
 export * from '@slangroom/shared/tokens';
 export * from '@slangroom/shared/zenroom';