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deno_core can provide ECMAScript built-ins but doesn’t expose Web APIs or Deno-specific APIs directly. You can either manually import Web APIs (like setTimeout, performance) or use Deno’s runtime in combination with deno_core to provide them.

Use Deno’s permission system to manage access to sensitive operations. For example:

const permission = await Deno.permissions.query({ name: "read", path: "./file.txt" });
if (permission.state === "granted") {
  // Allow access
}

Use FFI to call Rust functions from JS via deno_core. Create a Rust extension and interface with it in JS:

#[op_sync]
fn my_rust_function() -> String {
  "Hello from Rust!".to_string()
}

const result = await rustExtension.my_rust_function();
console.log(result); // "Hello from Rust!"

Run JS plugins with Deno's permission model, and interface with both Deno’s system APIs and Web APIs. Use deno_core for managing execution and permissions.

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