clojure.java.io/reader

(clojure.java.io/reader path) / (jio/reader path) with [clojure.java.io :as jio]

Opens a buffered reader over the file, through the same file-stream runtime slurp reads through. line-seq reads its lines without closing it; with-open closes it. Wires like clojure.string (:as, :refer, or the fully-qualified spelling); it is the only clojure.java.io var, and any other is an error. Runs on the interpreter and the JVM; on wasm it needs a --dir preopen covering the path -- without one the open signals the file-error. As a value a one-argument lambda over the same open.

clojure> (ns demo (:require [clojure.java.io :as jio]))
nil
clojure> (with-open [r (jio/reader "/tmp/note.txt")] (line-seq r))
("a" "b")