chore: Remove gulp and correct pack pipeline (#2525)

Our build scripts are now only in npm scripts and 
npm pack now includes source maps for debugging

NODE-2779

Author: nbbeeken

.gitignore

@@ -49,3 +49,5 @@ build/Release
 node_modules
 yarn.lock
 lib/
+*.tgz
+*.d.ts

.npmignore

@@ -30,12 +30,15 @@ performance/
 public/
 .coverage_data/
 .coveralls.yml
-.eslintrc
+.eslintrc.json
 docs/public
 .nyc_output/
-typings/
 jsconfig.json
 manual_tests/
 
 external-libs/bson/build/
 external-libs/bson/build/.wafpickle-7
+
+src/
+*.json
+Makefile

Gulpfile.ts

@@ -9,7 +9,7 @@
   },
   "dtsRollup": {
     "enabled": true,
-    "untrimmedFilePath": "<projectFolder>/types/<unscopedPackageName>.d.ts"
+    "untrimmedFilePath": "<projectFolder>/<unscopedPackageName>.d.ts"
   },
   "tsdocMetadata": {
     "enabled": false

api-extractor.json

@@ -3,7 +3,7 @@ var cp = require('child_process');
 var fs = require('fs');
 
 if (fs.existsSync('src')) {
-  cp.spawn('npx', ['gulp', 'compile'], { stdio: 'inherit' });
+  cp.spawn('npm', ['run', 'build:dts'], { stdio: 'inherit' });
 } else {
   if (!fs.existsSync('lib')) {
     console.warn('MongoDB: No compiled javascript present, the driver is not installed correctly.');