diff --git a/build.sh b/build.sh
index cb1d75c0..40409d83 100755
--- a/build.sh
+++ b/build.sh
@@ -4,14 +4,18 @@ set -eu
 # Pre-requisites:
 rustup target add wasm32-unknown-unknown
 if ! [[ $(wasm-bindgen --version) ]]; then
-    cargo install wasm-bindgen-cli
+    cargo install -f wasm-bindgen-cli
+fi
+
+if ! [[ -f docs/webassembly.d.ts ]]; then
+	curl https://raw.githubusercontent.com/01alchemist/webassembly-types/master/webassembly.d.ts > docs/webassembly.d.ts
 fi
 
 BUILD=debug
 # BUILD=release
 
 # Clear output from old stuff:
-rm -rf docs/*.d.ts
+# rm -rf docs/*.d.ts
 rm -rf docs/*.js
 rm -rf docs/*.wasm
 
@@ -28,8 +32,9 @@ function build_rust
 	  # --no-modules-global hoboho
 }
 
-echo "Compile typescript:"
 build_rust
+
+echo "Compile typescript:"
 tsc
 
 # wait || exit $?