From bdf4fc0819986e414891851aa8b707ccd659ce1b Mon Sep 17 00:00:00 2001
From: Dobes Vandermeer <dobesv@gmail.com>
Date: Thu, 14 Jun 2018 14:57:05 -0700
Subject: [PATCH] Fix generate() return type

`ObjectID().generate()` returns a `Buffer`, not a `string`

@horiuchi @CaselIT

See https://github.com/mongodb/js-bson/blob/master/lib/bson/objectid.js#L149 for the source code of bson, excerpted here:

```
/**
 * Generate a 12 byte id buffer used in ObjectID's
 *
 * @method
 * @param {number} [time] optional parameter allowing to pass in a second based timestamp.
 * @return {Buffer} return the 12 byte id buffer string.
 */
ObjectID.prototype.generate = function(time) {
  if ('number' !== typeof time) {
    time = ~~(Date.now() / 1000);
  }

  // Use pid
  var pid =
    (typeof process === 'undefined' || process.pid === 1
      ? Math.floor(Math.random() * 100000)
      : process.pid) % 0xffff;
  var inc = this.get_inc();
  // Buffer used
  var buffer = new Buffer(12);
  // Encode time
  buffer[3] = time & 0xff;
  buffer[2] = (time >> 8) & 0xff;
  buffer[1] = (time >> 16) & 0xff;
  buffer[0] = (time >> 24) & 0xff;
  // Encode machine
  buffer[6] = MACHINE_ID & 0xff;
  buffer[5] = (MACHINE_ID >> 8) & 0xff;
  buffer[4] = (MACHINE_ID >> 16) & 0xff;
  // Encode pid
  buffer[8] = pid & 0xff;
  buffer[7] = (pid >> 8) & 0xff;
  // Encode index
  buffer[11] = inc & 0xff;
  buffer[10] = (inc >> 8) & 0xff;
  buffer[9] = (inc >> 16) & 0xff;
  // Return the buffer
  return buffer;
};
```
---
 types/bson/index.d.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/types/bson/index.d.ts b/types/bson/index.d.ts
index 3b0feb0113..4d30097478 100644
--- a/types/bson/index.d.ts
+++ b/types/bson/index.d.ts
@@ -182,7 +182,7 @@ export class ObjectID {
      * @param {number} time optional parameter allowing to pass in a second based timestamp.
      * @return {string} return the 12 byte id binary string.
      */
-    generate(time?: number): string;
+    generate(time?: number): Buffer;
     /**
      * Returns the generation date (accurate up to the second) that this ID was generated.
      * @return {date} the generation date