Is inspecting import.meta.url a reliable way to distinguish browser and deno contexts?

let data

if(import.meta.url.startsWith('file')){ // we’re in deno
  let jsonstring = await Deno.readTextFile('delete.json')
  data = JSON.parse(jsonstring)  
} else if(import.meta.url.startsWith('http')){ // we’re in the browser
  let response = await fetch('delete.json')
  data = await response.json()
}

export {data}