diff --git a/Makefile b/Makefile
index 7bc661e64..72890b6b1 100644
--- a/Makefile
+++ b/Makefile
@@ -7,6 +7,7 @@ PCRE ?= 8.45
 ZLIB ?= 1.2.13
 LUAROCKS ?= 3.9.2
 PROXY_WASM_GO_SDK ?= v0.21.0
+PROXY_WASM_ASSEMBLYSCRIPT_SDK ?= v0.0.5
 
 # util/runtime.sh - no makefile target
 NGX_BUILD_WASMER_RUSTFLAGS ?= -g -C opt-level=0 -C debuginfo=1
diff --git a/util/_lib.sh b/util/_lib.sh
index aea179948..51a0a5a7e 100644
--- a/util/_lib.sh
+++ b/util/_lib.sh
@@ -7,6 +7,7 @@ DIR_NOPOOL=$DIR_DOWNLOAD/no-pool-nginx
 DIR_NGX_ECHO_MODULE=$DIR_DOWNLOAD/echo-nginx-module
 DIR_NGX_HEADERS_MORE_MODULE=$DIR_DOWNLOAD/headers-more-nginx-module
 DIR_MOCKEAGAIN=$DIR_DOWNLOAD/mockeagain
+DIR_PROXY_WASM_ASSEMBLYSCRIPT_SDK=$DIR_DOWNLOAD/proxy-wasm-assemblyscript-sdk
 DIR_PROXY_WASM_GO_SDK=$DIR_DOWNLOAD/proxy-wasm-go-sdk
 DIR_PATCHED_PROXY_WASM_GO_SDK=$DIR_DOWNLOAD/proxy-wasm-go-sdk-patched
 DIR_BUILDROOT=$DIR_WORK/buildroot
diff --git a/util/sdks/as.sh b/util/sdks/as.sh
deleted file mode 100644
index e69de29bb..000000000
diff --git a/util/sdks/assemblyscript.sh b/util/sdks/assemblyscript.sh
new file mode 100755
index 000000000..2375a8b3b
--- /dev/null
+++ b/util/sdks/assemblyscript.sh
@@ -0,0 +1,91 @@
+#!/usr/bin/env bash
+set -e
+
+SCRIPT_NAME=$(basename $0)
+NGX_WASM_DIR=${NGX_WASM_DIR:-"$(
+    cd $(dirname $(dirname $(dirname ${0})))
+    pwd -P
+)"}
+if [[ ! -f "${NGX_WASM_DIR}/util/_lib.sh" ]]; then
+    echo "Unable to source util/_lib.sh" >&2
+    exit 1
+fi
+
+source $NGX_WASM_DIR/util/_lib.sh
+
+###############################################################################
+
+download_assemblyscript_sdk() {
+    local version="$1"
+    local clean="$2"
+
+    if [[ "$clean" = "clean" ]]; then
+        rm -rfv "$DIR_PROXY_WASM_ASSEMBLYSCRIPT_SDK"
+    fi
+
+    if [[ -d "$DIR_PROXY_WASM_ASSEMBLYSCRIPT_SDK" ]]; then
+        notice "updating the proxy-wasm-assemblyscript-sdk repository..."
+        pushd $DIR_PROXY_WASM_ASSEMBLYSCRIPT_SDK
+            git fetch
+            git reset --hard $version
+        popd
+    else
+        notice "cloning proxy-wasm-assemblyscript-sdk repository, version ${version}..."
+        git clone \
+            -c advice.detachedHead=false --depth 1 \
+            --branch $version \
+            https://github.com/Kong/proxy-wasm-assemblyscript-sdk.git \
+            $DIR_PROXY_WASM_ASSEMBLYSCRIPT_SDK
+    fi
+}
+
+build_assemblyscript_sdk() {
+    local version="$1"
+    local clean="$2"
+
+    if [[ ! -x "$(command -v npm)" ]]; then
+        fatal "missing 'npm', is Node.js installed?"
+        exit 1
+    fi
+
+    local hasher=sha1sum
+    if [[ ! -x "$(command -v $hasher)" ]]; then
+        hasher=shasum
+    fi
+
+    local hash_src=$(find $DIR_PROXY_WASM_ASSEMBLYSCRIPT_SDK -type f \( -name '*.ts' -or -name 'package*.json' \) -exec $hasher {} \; \
+                     | $hasher | awk '{ print $1 }')
+
+    if [[ -f "$DIR_PROXY_WASM_ASSEMBLYSCRIPT_SDK/.hash" \
+          && $(cat "$DIR_PROXY_WASM_ASSEMBLYSCRIPT_SDK/.hash") == $(echo $hash_src) ]];
+    then
+        exit
+    fi
+
+    echo $hash_src > "$DIR_PROXY_WASM_ASSEMBLYSCRIPT_SDK/.hash"
+
+    notice "compiling AssemblyScript examples..."
+
+    for example in $DIR_PROXY_WASM_ASSEMBLYSCRIPT_SDK/examples/*; do
+        name=$(basename $example)
+        name=$(echo $name | sed 's/-/_/g')
+
+        pushd $example
+            npm install
+            npm run asbuild
+            cp build/debug.wasm $DIR_TESTS_LIB_WASM/assemblyscript_$name.wasm
+        popd
+    done
+}
+
+###############################################################################
+
+mode="$1"
+version="$2"
+clean="$3"
+
+if [ "$mode" = "download" ]; then
+    download_assemblyscript_sdk "$version" "$clean"
+else
+    build_assemblyscript_sdk "$version" "$clean"
+fi