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Deno.resources - Deno documentation
function Deno.resources
resources(): ResourceMap
Deprecated

This will be removed in Deno 2.0.

Returns a map of open resource IDs (rid) along with their string representations. This is an internal API and as such resource representation has unknown type; that means it can change any time and should not be depended upon.

console.log(Deno.resources());
// { 0: "stdin", 1: "stdout", 2: "stderr" }
Deno.openSync('../test.file');
console.log(Deno.resources());
// { 0: "stdin", 1: "stdout", 2: "stderr", 3: "fsFile" }

Return Type