fix: build js declarations (#141)

Argcfile.sh

@@ -162,6 +162,9 @@ build-declarations@tool() {
         json_data="$(generate-declarations@tool "$name" | jq -r '.[0]')" || {
             build_failed_tools+=("$name")
         }
+        if [[ "$json_data" == "null" ]]; then
+            _die "error: failed to build declartions for tool $name"
+        fi
         json_list+=("$json_data")
     done
     if [[ -n "$not_found_tools" ]]; then

scripts/build-declarations.js

@@ -53,7 +53,7 @@ function extractFunctions(contents, isTool) {
         continue;
       }
       if (isTool) {
-        if (new RegExp(`function ${TOOL_ENTRY_FUNC}`).test(line)) {
+        if (new RegExp(`^export (async )?function ${TOOL_ENTRY_FUNC}|^exports\.${TOOL_ENTRY_FUNC}`).test(line)) {
           output.push({
             funcName: TOOL_ENTRY_FUNC,
             jsdoc,