Update:Remove read-chunk dependency

server/libs/readChunk/index.js

@@ -0,0 +1,42 @@
+'use strict';
+
+// https://github.com/sindresorhus/read-chunk
+
+const fs = require('fs');
+const pify = require('./pify');
+const withOpenFile = require('./withOpenFile');
+
+const fsReadP = pify(fs.read, { multiArgs: true });
+
+const readChunk = (filePath, startPosition, length) => {
+  const buffer = Buffer.alloc(length);
+
+  return withOpenFile(filePath, 'r', fileDescriptor =>
+    fsReadP(fileDescriptor, buffer, 0, length, startPosition)
+  )
+    .then(([bytesRead, buffer]) => {
+      if (bytesRead < length) {
+        buffer = buffer.slice(0, bytesRead);
+      }
+
+      return buffer;
+    });
+};
+
+module.exports = readChunk;
+// TODO: Remove this for the next major release
+module.exports.default = readChunk;
+
+module.exports.sync = (filePath, startPosition, length) => {
+  let buffer = Buffer.alloc(length);
+
+  const bytesRead = withOpenFile.sync(filePath, 'r', fileDescriptor =>
+    fs.readSync(fileDescriptor, buffer, 0, length, startPosition)
+  );
+
+  if (bytesRead < length) {
+    buffer = buffer.slice(0, bytesRead);
+  }
+
+  return buffer;
+};