Function eval_str_captured 

pub fn eval_str_captured(
    src: &str,
    globals: &[(&str, &str)],
) -> (Result<Value, String>, String)

Run a JS source string on a fresh host with globals bound and the program’s output captured in-process, returning the program’s outcome alongside everything it wrote.

This is the entry point for an embedder rather than for the node binary, and it exists because eval_str cannot serve one: it resets the host first, which wipes any global installed beforehand, and it lets console.log reach the real stdout, which corrupts a host that owns the terminal. Both are fixed here — the globals are seeded after the reset, and every write the program makes lands in the returned string.

The outcome and the output are returned separately (rather than the output only on success) because a program that prints and then throws produced both, and an embedder generally wants to show both.

Globals are given as text and interned as real JS strings here. They are deliberately not Value: strings live on this host’s heap as JsObj::Str, so a Value::Str a caller builds is at best coerced and at worst method-less. Handing the host text and letting it intern removes that trap, and matches the sibling runtimes’ embedder entry points.

let (result, out) = nodejs::eval_str_captured("console.log(stdin.toUpperCase())", &[("stdin", "hi")]);
assert!(result.is_ok());
assert_eq!(out, "HI\n");