Write to virtual file path

Is it possible to provide virtual file paths so that another package writes a file to a variable in memory or to stdout?

I'm using

esbuild.build({ ... })

esbuild.build({ ... })

and I want to take the output of that and give it straight to deno, as in

deno run esbuild.js | deno run -

deno run esbuild.js | deno run -

.

I could solve the problem by writing to a temp file and running that.