Go playground WASM

package main

import "fmt"

func fibonacci(c, quit chan int) {
  x, y := 0, 1
  for {
    select {
    case c <- x:
      x, y = y, x+y
    case <-quit:
      fmt.Println("quit")
      return
    }
  }
}

func main() {
  c := make(chan int)
  quit := make(chan int)
  go func() {
    for i := 0; i < 12; i++ {
      fmt.Println(<-c)
    }
    quit <- 0
  }()
  
  fibonacci(c, quit)
}