Run npm install just before running typedoc

to ensure typing packages are installed.

Author: kateinoigakukun

rakelib/doc.rake

@@ -14,6 +14,7 @@ end
 
 desc "Generate TypeScript documentation"
 task :typedoc do
+  sh "npm install"
   mkdir_p "html/npm/@ruby/wasm-wasi"
   sh "npx typedoc packages/npm-packages/ruby-wasm-wasi/src/index.ts --sort source-order --out html/npm/@ruby/wasm-wasi"
 end