deno-proc

Abstractions for running processes in Deno.

This is still very early. Things are going to change. A lot. Functionality is limited. The API is unstable.

Deno has all the right parts for working with processes, but I really want something that is a better version of what I get in bash scripts. I want stdin and stdout pipes, decent default error handling, and minimal need to manually close things. I want all this to work with a fluent API.

documentation

deno doc -q https://deno.land/x/proc/mod.ts

stdout from a process as lines

for await (const line of run({ cmd: ["ls", "-la"] }).stdoutLines()) {
  console.log(line);
}

pipe stdout to stdin

const fileCount = await first(
  run({ cmd: ["ls", "-1"] })
    .pipe(run({ cmd: ["wc", "-l"] }))
    .stdoutLines(),
);

console.info(
  `Total number of files and folders in ${resolve(".")} is ${
    parseInt(fileCount!, 10)
  }.`,
);

process stderr lines

I’ve implemented .stderrLines() to allow access to the standard error stream. To gain access to this, you have to pass in pipeStderr: true when you create the process.

I don’t like this need for a-priori knowledge, and use of this is still more awkward than I would like. I am putting it in because it solves the problem, but expect API changes around this.