fix: add explicit module declaration to type definitions (#16219)

web3.js/scripts/typegen.sh

@@ -0,0 +1,19 @@
+set -e
+
+# Generate typescript declarations
+npx tsc -p tsconfig.d.json -d
+
+# Flatten typescript declarations
+npx rollup -c rollup.config.types.js
+
+# Replace export with closing brace for module declaration
+sed -i '$s/export {.*};/}/' lib/index.d.ts
+
+# Replace declare's with export's
+sed -i 's/declare/export/g' lib/index.d.ts
+
+# Prepend declare module line
+sed -i '2s;^;declare module "@solana/web3.js" {\n;' lib/index.d.ts
+
+# Run prettier
+npx prettier --write lib/index.d.ts