Deno offers some nice utilities out of the box like reading in the contents of
a file from the filesystem. The readTextFile function is available on the
Deno object.
// Read a file using Deno
const text: string = await Deno.readTextFile("./first_input.txt");You use a top-level await with the function call and, assuming the file exists,
it will read the contents in. In this case, I assign them to the text
variable.
For the file reading to work when the program is executed, you must use the
--allow-read flag.
$ deno run --allow-read program.ts