std.fs

import std.fs

Function	Signature	Description
fs.read_file	fs.read_file(path: str)	Read file contents (Result)
fs.write_file	fs.write_file(path: str, contents: str)	Write file (Result)
fs.exists	fs.exists(path: str) -> bool	Existence test

import std.fs

match fs.read_file("data.txt") {
    .ok(content) => println(content),
    .err(e) => println("Error: {e}"),
}

match fs.write_file("out.txt", "Hello World") {
    .ok(_) => println("Written"),
    .err(e) => println("Error: {e}"),
}

if fs.exists("config.toml") {
    println("config found")
}

Reads and writes return Result, so the error handling patterns (match, ??, unwrap_or) apply directly.