fix: Remove overwrite from payload when false

Fixes #23

index.js

@@ -225,6 +225,12 @@ function transformOptions(options) {
     options.tempDir = fs.mkdtempSync('bugsnag-sourcemaps');
     return transformSourcesMap(options);
   }
+  if (!options.overwrite) {
+    // the presence of any value for this flag causes the API to interpret it as
+    // true, so once it has been parsed and set remove it from the payload entirely
+    // if false(y)
+    delete options.overwrite
+  }
   return options;
 }
 

index.test.js

@@ -3,6 +3,7 @@
 const stripProjectRoot = require('./index').stripProjectRoot
 const upload = require('./index').upload
 const validateOptions = require('./index').validateOptions
+const transformOptions = require('./index').transformOptions
 
 test('upload function exists', () => {
   expect(typeof upload).toBe('function');
@@ -71,3 +72,12 @@ describe('validateOptions', () => {
     }).toThrow('You must provide a path to the source map you want to upload.');
   });
 });
+
+describe('transformOptions', () => {
+  test('removes options.overwrite when false', () => {
+    expect(transformOptions({ overwrite: false })).toEqual({});
+  });
+  test('does not remove options.overwrite when true', () => {
+    expect(transformOptions({ overwrite: true })).toEqual({ overwrite: true });
+  });
+});