decaffeinate: rename app/coffee dir to app/js

app/js/SafeReader.js

@@ -0,0 +1,47 @@
+/* eslint-disable
+    handle-callback-err,
+    no-unused-vars,
+    node/no-deprecated-api,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS101: Remove unnecessary use of Array.from
+ * DS102: Remove unnecessary code created because of implicit returns
+ * DS207: Consider shorter variations of null checks
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+let SafeReader;
+const fs = require("fs");
+const logger = require("logger-sharelatex");
+
+module.exports = (SafeReader = {
+
+	// safely read up to size bytes from a file and return result as a
+	// string
+
+	readFile(file, size, encoding, callback) {
+		if (callback == null) { callback = function(error, result) {}; }
+		return fs.open(file, 'r', function(err, fd) {
+			if ((err != null) && (err.code === 'ENOENT')) { return callback(); }
+			if (err != null) { return callback(err); }
+
+			// safely return always closing the file
+			const callbackWithClose = (err, ...result) =>
+				fs.close(fd, function(err1) {
+					if (err != null) { return callback(err); }
+					if (err1 != null) { return callback(err1); }
+					return callback(null, ...Array.from(result));
+				})
+			;
+
+			const buff = new Buffer(size, 0); // fill with zeros
+			return fs.read(fd, buff, 0, buff.length, 0, function(err, bytesRead, buffer) {
+				if (err != null) { return callbackWithClose(err); }
+				const result = buffer.toString(encoding, 0, bytesRead);
+				return callbackWithClose(null, result, bytesRead);
+			});
+		});
+	}
+});