fix broken types

Author: runk

src/index.test.ts

@@ -114,7 +114,7 @@ describe('index', () => {
     // it('should check for an error when cannot read database on update', async () => {
     //   var counter = 0;
     //   var cb = function(err, reader) {
-    //     // Indeed couter is kinda gross.
+    //     // Indeed counter is kinda gross.
     //     switch (counter++) {
     //       case 0:
     //         assert.strictEqual(err, null);

src/index.ts

@@ -41,9 +41,15 @@ const readLargeFile = async (filepath: string, size: number): Promise<Buffer> =>
       highWaterMark: STREAM_WATERMARK,
     });
 
-    stream.on('data', (chunk: Buffer) => {
-      chunk.copy(buffer, offset);
-      offset += chunk.length;
+    stream.on('data', (chunk: string | Buffer) => {
+      if (Buffer.isBuffer(chunk)) {
+        chunk.copy(buffer, offset);
+        offset += chunk.length;
+      } else {
+        const bufferChunk = Buffer.from(chunk);
+        bufferChunk.copy(buffer, offset);
+        offset += bufferChunk.length;
+      }
     });
 
     stream.on('end', () => {