diff --git a/README.md b/README.md
index 43b3cc2a2..41631abde 100644
--- a/README.md
+++ b/README.md
@@ -25,9 +25,11 @@ individually, resulting in smaller Lambda packages that contain only the code an
 dependencies needed to run the function. This allows the plugin to fully utilize
 WebPack's [Tree-Shaking][link-webpack-tree] optimization.
 * Webpack version 3 and 4 support
+* Support NPM and Yarn for packaging
 
 ## Recent improvements and important changes
 
+* Support Yarn
 * Support Webpack 4
 * Drop Webpack 2 support
 * Cleaned up configuration. You should now use a `custom.webpack` object to configure everything relevant for the plugin. The old configuration still works but will be removed in the next major release. For details see below.
@@ -634,6 +636,11 @@ me to take it over and continue working on the project. That helped to revive it
 
 ## Release Notes
 
+* 5.1.0
+  * Support Yarn [#286][link-286]
+  * Allow local invoke to use existing compiled output [#341][link-341] [#275][link-275]
+  * Support custom packager scripts [#343][link-343] [#342][link-342]
+
 * 5.0.0
   * Support Webpack 4 [#331][link-331] [#328][link-328]
   * BREAKING: Drop support for Webpack 2
@@ -832,3 +839,9 @@ me to take it over and continue working on the project. That helped to revive it
 [link-328]: https://github.com/serverless-heaven/serverless-webpack/pull/328
 [link-336]: https://github.com/serverless-heaven/serverless-webpack/pull/336
 [link-337]: https://github.com/serverless-heaven/serverless-webpack/pull/337
+
+[link-275]: https://github.com/serverless-heaven/serverless-webpack/issues/275
+[link-286]: https://github.com/serverless-heaven/serverless-webpack/issues/286
+[link-341]: https://github.com/serverless-heaven/serverless-webpack/issues/341
+[link-342]: https://github.com/serverless-heaven/serverless-webpack/issues/342
+[link-343]: https://github.com/serverless-heaven/serverless-webpack/issues/343
diff --git a/package-lock.json b/package-lock.json
index 9a276dd64..01184b5da 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "serverless-webpack",
-  "version": "5.0.0",
+  "version": "5.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -1483,9 +1483,9 @@
       }
     },
     "eslint-plugin-promise": {
-      "version": "3.6.0",
-      "resolved": "https://registry.npmjs.org/eslint-plugin-promise/-/eslint-plugin-promise-3.6.0.tgz",
-      "integrity": "sha512-YQzM6TLTlApAr7Li8vWKR+K3WghjwKcYzY0d2roWap4SLK+kzuagJX/leTetIDWsFcTFnKNJXWupDCD6aZkP2Q==",
+      "version": "3.7.0",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-promise/-/eslint-plugin-promise-3.7.0.tgz",
+      "integrity": "sha512-2WO+ZFh7vxUKRfR0cOIMrWgYKdR6S1AlOezw6pC52B6oYpd5WFghN+QHxvrRdZMtbo8h3dfUZ2o1rWb0UPbKtg==",
       "dev": true
     },
     "eslint-scope": {
@@ -2665,15 +2665,15 @@
       }
     },
     "mocha": {
-      "version": "5.0.2",
-      "resolved": "https://registry.npmjs.org/mocha/-/mocha-5.0.2.tgz",
-      "integrity": "sha512-nmlYKMRpJZLxgzk0bRhcvlpjSisbi0x1JiRl7kctadOMPmecUie7WwCZmcyth+PzX5txKbpcMIvDZCAlx9ISxg==",
+      "version": "5.0.4",
+      "resolved": "https://registry.npmjs.org/mocha/-/mocha-5.0.4.tgz",
+      "integrity": "sha512-nMOpAPFosU1B4Ix1jdhx5e3q7XO55ic5a8cgYvW27CequcEY+BabS0kUVL1Cw1V5PuVHZWeNRWFLmEPexo79VA==",
       "dev": true,
       "requires": {
         "browser-stdout": "1.3.1",
         "commander": "2.11.0",
         "debug": "3.1.0",
-        "diff": "3.3.1",
+        "diff": "3.5.0",
         "escape-string-regexp": "1.0.5",
         "glob": "7.1.2",
         "growl": "1.10.3",
@@ -2698,9 +2698,9 @@
           }
         },
         "diff": {
-          "version": "3.3.1",
-          "resolved": "https://registry.npmjs.org/diff/-/diff-3.3.1.tgz",
-          "integrity": "sha512-MKPHZDMB0o6yHyDryUOScqZibp914ksXwAMYMTHj6KO8UeKsRYNJD3oNCKjTqZon+V488P7N/HzXF8t7ZR95ww==",
+          "version": "3.5.0",
+          "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
+          "integrity": "sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA==",
           "dev": true
         },
         "supports-color": {
@@ -2844,9 +2844,9 @@
       "dev": true
     },
     "nyc": {
-      "version": "11.4.1",
-      "resolved": "https://registry.npmjs.org/nyc/-/nyc-11.4.1.tgz",
-      "integrity": "sha512-5eCZpvaksFVjP2rt1r60cfXmt3MUtsQDw8bAzNqNEr4WLvUMLgiVENMf/B9bE9YAX0mGVvaGA3v9IS9ekNqB1Q==",
+      "version": "11.6.0",
+      "resolved": "https://registry.npmjs.org/nyc/-/nyc-11.6.0.tgz",
+      "integrity": "sha512-ZaXCh0wmbk2aSBH2B5hZGGvK2s9aM8DIm2rVY+BG3Fx8tUS+bpJSswUVZqOD1YfCmnYRFSqgYJSr7UeeUcW0jg==",
       "dev": true,
       "requires": {
         "archy": "1.0.0",
@@ -2859,23 +2859,23 @@
         "find-up": "2.1.0",
         "foreground-child": "1.5.6",
         "glob": "7.1.2",
-        "istanbul-lib-coverage": "1.1.1",
+        "istanbul-lib-coverage": "1.2.0",
         "istanbul-lib-hook": "1.1.0",
-        "istanbul-lib-instrument": "1.9.1",
-        "istanbul-lib-report": "1.1.2",
-        "istanbul-lib-source-maps": "1.2.2",
-        "istanbul-reports": "1.1.3",
+        "istanbul-lib-instrument": "1.10.1",
+        "istanbul-lib-report": "1.1.3",
+        "istanbul-lib-source-maps": "1.2.3",
+        "istanbul-reports": "1.3.0",
         "md5-hex": "1.3.0",
-        "merge-source-map": "1.0.4",
+        "merge-source-map": "1.1.0",
         "micromatch": "2.3.11",
         "mkdirp": "0.5.1",
         "resolve-from": "2.0.0",
         "rimraf": "2.6.2",
         "signal-exit": "3.0.2",
         "spawn-wrap": "1.4.2",
-        "test-exclude": "4.1.1",
-        "yargs": "10.0.3",
-        "yargs-parser": "8.0.0"
+        "test-exclude": "4.2.1",
+        "yargs": "11.1.0",
+        "yargs-parser": "8.1.0"
       },
       "dependencies": {
         "align-text": {
@@ -2929,6 +2929,11 @@
           "bundled": true,
           "dev": true
         },
+        "arr-union": {
+          "version": "3.1.0",
+          "bundled": true,
+          "dev": true
+        },
         "array-unique": {
           "version": "0.2.1",
           "bundled": true,
@@ -2939,11 +2944,21 @@
           "bundled": true,
           "dev": true
         },
+        "assign-symbols": {
+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true
+        },
         "async": {
           "version": "1.5.2",
           "bundled": true,
           "dev": true
         },
+        "atob": {
+          "version": "2.0.3",
+          "bundled": true,
+          "dev": true
+        },
         "babel-code-frame": {
           "version": "6.26.0",
           "bundled": true,
@@ -2955,7 +2970,7 @@
           }
         },
         "babel-generator": {
-          "version": "6.26.0",
+          "version": "6.26.1",
           "bundled": true,
           "dev": true,
           "requires": {
@@ -2964,7 +2979,7 @@
             "babel-types": "6.26.0",
             "detect-indent": "4.0.0",
             "jsesc": "1.3.0",
-            "lodash": "4.17.4",
+            "lodash": "4.17.5",
             "source-map": "0.5.7",
             "trim-right": "1.0.1"
           }
@@ -2995,7 +3010,7 @@
             "babel-traverse": "6.26.0",
             "babel-types": "6.26.0",
             "babylon": "6.18.0",
-            "lodash": "4.17.4"
+            "lodash": "4.17.5"
           }
         },
         "babel-traverse": {
@@ -3010,8 +3025,8 @@
             "babylon": "6.18.0",
             "debug": "2.6.9",
             "globals": "9.18.0",
-            "invariant": "2.2.2",
-            "lodash": "4.17.4"
+            "invariant": "2.2.3",
+            "lodash": "4.17.5"
           }
         },
         "babel-types": {
@@ -3021,7 +3036,7 @@
           "requires": {
             "babel-runtime": "6.26.0",
             "esutils": "2.0.2",
-            "lodash": "4.17.4",
+            "lodash": "4.17.5",
             "to-fast-properties": "1.0.3"
           }
         },
@@ -3035,8 +3050,37 @@
           "bundled": true,
           "dev": true
         },
+        "base": {
+          "version": "0.11.2",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "cache-base": "1.0.1",
+            "class-utils": "0.3.6",
+            "component-emitter": "1.2.1",
+            "define-property": "1.0.0",
+            "isobject": "3.0.1",
+            "mixin-deep": "1.3.1",
+            "pascalcase": "0.1.1"
+          },
+          "dependencies": {
+            "define-property": {
+              "version": "1.0.0",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-descriptor": "1.0.2"
+              }
+            },
+            "isobject": {
+              "version": "3.0.1",
+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
         "brace-expansion": {
-          "version": "1.1.8",
+          "version": "1.1.11",
           "bundled": true,
           "dev": true,
           "requires": {
@@ -3059,6 +3103,29 @@
           "bundled": true,
           "dev": true
         },
+        "cache-base": {
+          "version": "1.0.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "collection-visit": "1.0.0",
+            "component-emitter": "1.2.1",
+            "get-value": "2.0.6",
+            "has-value": "1.0.0",
+            "isobject": "3.0.1",
+            "set-value": "2.0.0",
+            "to-object-path": "0.3.0",
+            "union-value": "1.0.0",
+            "unset-value": "1.0.0"
+          },
+          "dependencies": {
+            "isobject": {
+              "version": "3.0.1",
+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
         "caching-transform": {
           "version": "1.0.1",
           "bundled": true,
@@ -3097,6 +3164,83 @@
             "supports-color": "2.0.0"
           }
         },
+        "class-utils": {
+          "version": "0.3.6",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "arr-union": "3.1.0",
+            "define-property": "0.2.5",
+            "isobject": "3.0.1",
+            "static-extend": "0.1.2"
+          },
+          "dependencies": {
+            "define-property": {
+              "version": "0.2.5",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-descriptor": "0.1.6"
+              }
+            },
+            "is-accessor-descriptor": {
+              "version": "0.1.6",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "kind-of": "3.2.2"
+              },
+              "dependencies": {
+                "kind-of": {
+                  "version": "3.2.2",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-buffer": "1.1.6"
+                  }
+                }
+              }
+            },
+            "is-data-descriptor": {
+              "version": "0.1.4",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "kind-of": "3.2.2"
+              },
+              "dependencies": {
+                "kind-of": {
+                  "version": "3.2.2",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-buffer": "1.1.6"
+                  }
+                }
+              }
+            },
+            "is-descriptor": {
+              "version": "0.1.6",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-accessor-descriptor": "0.1.6",
+                "is-data-descriptor": "0.1.4",
+                "kind-of": "5.1.0"
+              }
+            },
+            "isobject": {
+              "version": "3.0.1",
+              "bundled": true,
+              "dev": true
+            },
+            "kind-of": {
+              "version": "5.1.0",
+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
         "cliui": {
           "version": "2.1.0",
           "bundled": true,
@@ -3121,11 +3265,25 @@
           "bundled": true,
           "dev": true
         },
+        "collection-visit": {
+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "map-visit": "1.0.0",
+            "object-visit": "1.0.1"
+          }
+        },
         "commondir": {
           "version": "1.0.1",
           "bundled": true,
           "dev": true
         },
+        "component-emitter": {
+          "version": "1.2.1",
+          "bundled": true,
+          "dev": true
+        },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
@@ -3136,6 +3294,11 @@
           "bundled": true,
           "dev": true
         },
+        "copy-descriptor": {
+          "version": "0.1.1",
+          "bundled": true,
+          "dev": true
+        },
         "core-js": {
           "version": "2.5.3",
           "bundled": true,
@@ -3146,7 +3309,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "lru-cache": "4.1.1",
+            "lru-cache": "4.1.2",
             "which": "1.3.0"
           }
         },
@@ -3168,6 +3331,11 @@
           "bundled": true,
           "dev": true
         },
+        "decode-uri-component": {
+          "version": "0.2.0",
+          "bundled": true,
+          "dev": true
+        },
         "default-require-extensions": {
           "version": "1.0.0",
           "bundled": true,
@@ -3176,6 +3344,22 @@
             "strip-bom": "2.0.0"
           }
         },
+        "define-property": {
+          "version": "2.0.2",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "is-descriptor": "1.0.2",
+            "isobject": "3.0.1"
+          },
+          "dependencies": {
+            "isobject": {
+              "version": "3.0.1",
+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
         "detect-indent": {
           "version": "4.0.0",
           "bundled": true,
@@ -3221,7 +3405,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "lru-cache": "4.1.1",
+                "lru-cache": "4.1.2",
                 "shebang-command": "1.2.0",
                 "which": "1.3.0"
               }
@@ -3244,6 +3428,25 @@
             "fill-range": "2.2.3"
           }
         },
+        "extend-shallow": {
+          "version": "3.0.2",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "assign-symbols": "1.0.0",
+            "is-extendable": "1.0.1"
+          },
+          "dependencies": {
+            "is-extendable": {
+              "version": "1.0.1",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-plain-object": "2.0.4"
+              }
+            }
+          }
+        },
         "extglob": {
           "version": "0.3.2",
           "bundled": true,
@@ -3309,6 +3512,14 @@
             "signal-exit": "3.0.2"
           }
         },
+        "fragment-cache": {
+          "version": "0.2.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "map-cache": "0.2.2"
+          }
+        },
         "fs.realpath": {
           "version": "1.0.0",
           "bundled": true,
@@ -3324,6 +3535,11 @@
           "bundled": true,
           "dev": true
         },
+        "get-value": {
+          "version": "2.0.6",
+          "bundled": true,
+          "dev": true
+        },
         "glob": {
           "version": "7.1.2",
           "bundled": true,
@@ -3398,8 +3614,62 @@
           "bundled": true,
           "dev": true
         },
+        "has-value": {
+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "get-value": "2.0.6",
+            "has-values": "1.0.0",
+            "isobject": "3.0.1"
+          },
+          "dependencies": {
+            "isobject": {
+              "version": "3.0.1",
+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
+        "has-values": {
+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "is-number": "3.0.0",
+            "kind-of": "4.0.0"
+          },
+          "dependencies": {
+            "is-number": {
+              "version": "3.0.0",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "kind-of": "3.2.2"
+              },
+              "dependencies": {
+                "kind-of": {
+                  "version": "3.2.2",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-buffer": "1.1.6"
+                  }
+                }
+              }
+            },
+            "kind-of": {
+              "version": "4.0.0",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-buffer": "1.1.6"
+              }
+            }
+          }
+        },
         "hosted-git-info": {
-          "version": "2.5.0",
+          "version": "2.6.0",
           "bundled": true,
           "dev": true
         },
@@ -3423,7 +3693,7 @@
           "dev": true
         },
         "invariant": {
-          "version": "2.2.2",
+          "version": "2.2.3",
           "bundled": true,
           "dev": true,
           "requires": {
@@ -3435,6 +3705,21 @@
           "bundled": true,
           "dev": true
         },
+        "is-accessor-descriptor": {
+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "kind-of": "6.0.2"
+          },
+          "dependencies": {
+            "kind-of": {
+              "version": "6.0.2",
+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
         "is-arrayish": {
           "version": "0.2.1",
           "bundled": true,
@@ -3453,6 +3738,38 @@
             "builtin-modules": "1.1.1"
           }
         },
+        "is-data-descriptor": {
+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "kind-of": "6.0.2"
+          },
+          "dependencies": {
+            "kind-of": {
+              "version": "6.0.2",
+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
+        "is-descriptor": {
+          "version": "1.0.2",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "is-accessor-descriptor": "1.0.0",
+            "is-data-descriptor": "1.0.0",
+            "kind-of": "6.0.2"
+          },
+          "dependencies": {
+            "kind-of": {
+              "version": "6.0.2",
+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
         "is-dotfile": {
           "version": "1.0.3",
           "bundled": true,
@@ -3485,12 +3802,9 @@
           }
         },
         "is-fullwidth-code-point": {
-          "version": "1.0.0",
+          "version": "2.0.0",
           "bundled": true,
-          "dev": true,
-          "requires": {
-            "number-is-nan": "1.0.1"
-          }
+          "dev": true
         },
         "is-glob": {
           "version": "2.0.1",
@@ -3508,26 +3822,61 @@
             "kind-of": "3.2.2"
           }
         },
-        "is-posix-bracket": {
-          "version": "0.1.1",
-          "bundled": true,
-          "dev": true
-        },
-        "is-primitive": {
+        "is-odd": {
           "version": "2.0.0",
           "bundled": true,
-          "dev": true
-        },
-        "is-stream": {
-          "version": "1.1.0",
-          "bundled": true,
-          "dev": true
+          "dev": true,
+          "requires": {
+            "is-number": "4.0.0"
+          },
+          "dependencies": {
+            "is-number": {
+              "version": "4.0.0",
+              "bundled": true,
+              "dev": true
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+              "dev": true
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+          "bundled": true,
+          "dev": true
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@@ -3547,7 +3896,7 @@
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-          "version": "1.1.1",
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@@ -3560,25 +3909,25 @@
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+            "babel-generator": "6.26.1",
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             "babylon": "6.18.0",
-            "istanbul-lib-coverage": "1.1.1",
-            "semver": "5.4.1"
+            "istanbul-lib-coverage": "1.2.0",
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@@ -3595,12 +3944,12 @@
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@@ -3617,7 +3966,7 @@
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@@ -3685,7 +4034,7 @@
           }
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-          "version": "4.17.4",
+          "version": "4.17.5",
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@@ -3703,7 +4052,7 @@
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@@ -3711,6 +4060,19 @@
             "yallist": "2.1.2"
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+          "bundled": true,
+          "dev": true
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+          "bundled": true,
+          "dev": true,
+          "requires": {
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+          }
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@@ -3729,15 +4091,22 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "mimic-fn": "1.1.0"
+            "mimic-fn": "1.2.0"
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           "dev": true,
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+            "source-map": "0.6.1"
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+              "dev": true
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         "micromatch": {
@@ -3761,7 +4130,7 @@
           }
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@@ -3770,7 +4139,7 @@
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+            "brace-expansion": "1.1.11"
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         "minimist": {
@@ -3778,6 +4147,25 @@
           "bundled": true,
           "dev": true
         },
+        "mixin-deep": {
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+          "bundled": true,
+          "dev": true,
+          "requires": {
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+            "is-extendable": "1.0.1"
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+              }
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           "bundled": true,
@@ -3791,15 +4179,51 @@
           "bundled": true,
           "dev": true
         },
+        "nanomatch": {
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+          "bundled": true,
+          "dev": true,
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+            "snapdragon": "0.8.2",
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-            "semver": "5.4.1",
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+            "semver": "5.5.0",
+            "validate-npm-package-license": "3.0.3"
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@@ -3828,6 +4252,74 @@
           "bundled": true,
           "dev": true
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@@ -3837,6 +4329,21 @@
             "is-extendable": "0.1.1"
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@@ -3875,18 +4382,26 @@
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-          "dev": true
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           "bundled": true,
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           "requires": {
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+            "p-limit": "1.2.0"
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+          "bundled": true,
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           "bundled": true,
@@ -3906,6 +4421,11 @@
             "error-ex": "1.3.1"
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+          "bundled": true,
+          "dev": true
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           "bundled": true,
@@ -3976,6 +4496,11 @@
             }
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           "bundled": true,
@@ -4066,6 +4591,15 @@
             "is-equal-shallow": "0.1.3"
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+          "bundled": true,
+          "dev": true,
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           "bundled": true,
@@ -4104,6 +4638,16 @@
           "bundled": true,
           "dev": true
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@@ -4121,147 +4665,665 @@
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-          "dev": true
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+              "dev": true,
+              "requires": {
+                "ansi-regex": "3.0.0"
+              }
+            }
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "ansi-regex": "2.1.1"
+          }
+        },
+        "strip-bom": {
+          "version": "2.0.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "is-utf8": "0.2.1"
+          }
+        },
+        "strip-eof": {
+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true
+        },
+        "supports-color": {
+          "version": "2.0.0",
+          "bundled": true,
+          "dev": true
+        },
+        "test-exclude": {
+          "version": "4.2.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "arrify": "1.0.1",
+            "micromatch": "3.1.9",
+            "object-assign": "4.1.1",
+            "read-pkg-up": "1.0.1",
+            "require-main-filename": "1.0.1"
+          },
+          "dependencies": {
+            "arr-diff": {
+              "version": "4.0.0",
+              "bundled": true,
+              "dev": true
+            },
+            "array-unique": {
+              "version": "0.3.2",
+              "bundled": true,
+              "dev": true
+            },
+            "braces": {
+              "version": "2.3.1",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "arr-flatten": "1.1.0",
+                "array-unique": "0.3.2",
+                "define-property": "1.0.0",
+                "extend-shallow": "2.0.1",
+                "fill-range": "4.0.0",
+                "isobject": "3.0.1",
+                "kind-of": "6.0.2",
+                "repeat-element": "1.1.2",
+                "snapdragon": "0.8.2",
+                "snapdragon-node": "2.1.1",
+                "split-string": "3.1.0",
+                "to-regex": "3.0.2"
+              },
+              "dependencies": {
+                "define-property": {
+                  "version": "1.0.0",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-descriptor": "1.0.2"
+                  }
+                },
+                "extend-shallow": {
+                  "version": "2.0.1",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-extendable": "0.1.1"
+                  }
+                }
+              }
+            },
+            "expand-brackets": {
+              "version": "2.1.4",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "debug": "2.6.9",
+                "define-property": "0.2.5",
+                "extend-shallow": "2.0.1",
+                "posix-character-classes": "0.1.1",
+                "regex-not": "1.0.2",
+                "snapdragon": "0.8.2",
+                "to-regex": "3.0.2"
+              },
+              "dependencies": {
+                "define-property": {
+                  "version": "0.2.5",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-descriptor": "0.1.6"
+                  }
+                },
+                "extend-shallow": {
+                  "version": "2.0.1",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-extendable": "0.1.1"
+                  }
+                },
+                "is-descriptor": {
+                  "version": "0.1.6",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-accessor-descriptor": "0.1.6",
+                    "is-data-descriptor": "0.1.4",
+                    "kind-of": "5.1.0"
+                  }
+                },
+                "kind-of": {
+                  "version": "5.1.0",
+                  "bundled": true,
+                  "dev": true
+                }
+              }
+            },
+            "extglob": {
+              "version": "2.0.4",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "array-unique": "0.3.2",
+                "define-property": "1.0.0",
+                "expand-brackets": "2.1.4",
+                "extend-shallow": "2.0.1",
+                "fragment-cache": "0.2.1",
+                "regex-not": "1.0.2",
+                "snapdragon": "0.8.2",
+                "to-regex": "3.0.2"
+              },
+              "dependencies": {
+                "define-property": {
+                  "version": "1.0.0",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-descriptor": "1.0.2"
+                  }
+                },
+                "extend-shallow": {
+                  "version": "2.0.1",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-extendable": "0.1.1"
+                  }
+                }
+              }
+            },
+            "fill-range": {
+              "version": "4.0.0",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "extend-shallow": "2.0.1",
+                "is-number": "3.0.0",
+                "repeat-string": "1.6.1",
+                "to-regex-range": "2.1.1"
+              },
+              "dependencies": {
+                "extend-shallow": {
+                  "version": "2.0.1",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-extendable": "0.1.1"
+                  }
+                }
+              }
+            },
+            "is-accessor-descriptor": {
+              "version": "0.1.6",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "kind-of": "3.2.2"
+              },
+              "dependencies": {
+                "kind-of": {
+                  "version": "3.2.2",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-buffer": "1.1.6"
+                  }
+                }
+              }
+            },
+            "is-data-descriptor": {
+              "version": "0.1.4",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "kind-of": "3.2.2"
+              },
+              "dependencies": {
+                "kind-of": {
+                  "version": "3.2.2",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-buffer": "1.1.6"
+                  }
+                }
+              }
+            },
+            "is-number": {
+              "version": "3.0.0",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "kind-of": "3.2.2"
+              },
+              "dependencies": {
+                "kind-of": {
+                  "version": "3.2.2",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-buffer": "1.1.6"
+                  }
+                }
+              }
+            },
+            "isobject": {
+              "version": "3.0.1",
+              "bundled": true,
+              "dev": true
+            },
+            "kind-of": {
+              "version": "6.0.2",
+              "bundled": true,
+              "dev": true
+            },
+            "micromatch": {
+              "version": "3.1.9",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "arr-diff": "4.0.0",
+                "array-unique": "0.3.2",
+                "braces": "2.3.1",
+                "define-property": "2.0.2",
+                "extend-shallow": "3.0.2",
+                "extglob": "2.0.4",
+                "fragment-cache": "0.2.1",
+                "kind-of": "6.0.2",
+                "nanomatch": "1.2.9",
+                "object.pick": "1.3.0",
+                "regex-not": "1.0.2",
+                "snapdragon": "0.8.2",
+                "to-regex": "3.0.2"
+              }
+            }
+          }
+        },
+        "to-fast-properties": {
+          "version": "1.0.3",
           "bundled": true,
           "dev": true
         },
-        "shebang-command": {
-          "version": "1.2.0",
+        "to-object-path": {
+          "version": "0.3.0",
           "bundled": true,
           "dev": true,
           "requires": {
-            "shebang-regex": "1.0.0"
+            "kind-of": "3.2.2"
           }
         },
-        "shebang-regex": {
-          "version": "1.0.0",
-          "bundled": true,
-          "dev": true
-        },
-        "signal-exit": {
+        "to-regex": {
           "version": "3.0.2",
           "bundled": true,
-          "dev": true
-        },
-        "slide": {
-          "version": "1.1.6",
-          "bundled": true,
-          "dev": true
-        },
-        "source-map": {
-          "version": "0.5.7",
-          "bundled": true,
-          "dev": true
-        },
-        "spawn-wrap": {
-          "version": "1.4.2",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "foreground-child": "1.5.6",
-            "mkdirp": "0.5.1",
-            "os-homedir": "1.0.2",
-            "rimraf": "2.6.2",
-            "signal-exit": "3.0.2",
-            "which": "1.3.0"
-          }
-        },
-        "spdx-correct": {
-          "version": "1.0.2",
-          "bundled": true,
           "dev": true,
           "requires": {
-            "spdx-license-ids": "1.2.2"
+            "define-property": "2.0.2",
+            "extend-shallow": "3.0.2",
+            "regex-not": "1.0.2",
+            "safe-regex": "1.1.0"
           }
         },
-        "spdx-expression-parse": {
-          "version": "1.0.4",
-          "bundled": true,
-          "dev": true
-        },
-        "spdx-license-ids": {
-          "version": "1.2.2",
-          "bundled": true,
-          "dev": true
-        },
-        "string-width": {
+        "to-regex-range": {
           "version": "2.1.1",
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-fullwidth-code-point": "2.0.0",
-            "strip-ansi": "4.0.0"
+            "is-number": "3.0.0",
+            "repeat-string": "1.6.1"
           },
           "dependencies": {
-            "ansi-regex": {
+            "is-number": {
               "version": "3.0.0",
               "bundled": true,
-              "dev": true
-            },
-            "is-fullwidth-code-point": {
-              "version": "2.0.0",
-              "bundled": true,
-              "dev": true
-            },
-            "strip-ansi": {
-              "version": "4.0.0",
-              "bundled": true,
               "dev": true,
               "requires": {
-                "ansi-regex": "3.0.0"
+                "kind-of": "3.2.2"
               }
             }
           }
         },
-        "strip-ansi": {
-          "version": "3.0.1",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "ansi-regex": "2.1.1"
-          }
-        },
-        "strip-bom": {
-          "version": "2.0.0",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "is-utf8": "0.2.1"
-          }
-        },
-        "strip-eof": {
-          "version": "1.0.0",
-          "bundled": true,
-          "dev": true
-        },
-        "supports-color": {
-          "version": "2.0.0",
-          "bundled": true,
-          "dev": true
-        },
-        "test-exclude": {
-          "version": "4.1.1",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "arrify": "1.0.1",
-            "micromatch": "2.3.11",
-            "object-assign": "4.1.1",
-            "read-pkg-up": "1.0.1",
-            "require-main-filename": "1.0.1"
-          }
-        },
-        "to-fast-properties": {
-          "version": "1.0.3",
-          "bundled": true,
-          "dev": true
-        },
         "trim-right": {
           "version": "1.0.1",
           "bundled": true,
@@ -4298,13 +5360,106 @@
           "dev": true,
           "optional": true
         },
+        "union-value": {
+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "arr-union": "3.1.0",
+            "get-value": "2.0.6",
+            "is-extendable": "0.1.1",
+            "set-value": "0.4.3"
+          },
+          "dependencies": {
+            "extend-shallow": {
+              "version": "2.0.1",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-extendable": "0.1.1"
+              }
+            },
+            "set-value": {
+              "version": "0.4.3",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "extend-shallow": "2.0.1",
+                "is-extendable": "0.1.1",
+                "is-plain-object": "2.0.4",
+                "to-object-path": "0.3.0"
+              }
+            }
+          }
+        },
+        "unset-value": {
+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "has-value": "0.3.1",
+            "isobject": "3.0.1"
+          },
+          "dependencies": {
+            "has-value": {
+              "version": "0.3.1",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "get-value": "2.0.6",
+                "has-values": "0.1.4",
+                "isobject": "2.1.0"
+              },
+              "dependencies": {
+                "isobject": {
+                  "version": "2.1.0",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "isarray": "1.0.0"
+                  }
+                }
+              }
+            },
+            "has-values": {
+              "version": "0.1.4",
+              "bundled": true,
+              "dev": true
+            },
+            "isobject": {
+              "version": "3.0.1",
+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
+        "urix": {
+          "version": "0.1.0",
+          "bundled": true,
+          "dev": true
+        },
+        "use": {
+          "version": "3.1.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "kind-of": "6.0.2"
+          },
+          "dependencies": {
+            "kind-of": {
+              "version": "6.0.2",
+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
         "validate-npm-package-license": {
-          "version": "3.0.1",
+          "version": "3.0.3",
           "bundled": true,
           "dev": true,
           "requires": {
-            "spdx-correct": "1.0.2",
-            "spdx-expression-parse": "1.0.4"
+            "spdx-correct": "3.0.0",
+            "spdx-expression-parse": "3.0.0"
           }
         },
         "which": {
@@ -4340,6 +5495,14 @@
             "strip-ansi": "3.0.1"
           },
           "dependencies": {
+            "is-fullwidth-code-point": {
+              "version": "1.0.0",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "number-is-nan": "1.0.1"
+              }
+            },
             "string-width": {
               "version": "1.0.2",
               "bundled": true,
@@ -4378,11 +5541,11 @@
           "dev": true
         },
         "yargs": {
-          "version": "10.0.3",
+          "version": "11.1.0",
           "bundled": true,
           "dev": true,
           "requires": {
-            "cliui": "3.2.0",
+            "cliui": "4.0.0",
             "decamelize": "1.2.0",
             "find-up": "2.1.0",
             "get-caller-file": "1.0.2",
@@ -4393,35 +5556,49 @@
             "string-width": "2.1.1",
             "which-module": "2.0.0",
             "y18n": "3.2.1",
-            "yargs-parser": "8.0.0"
+            "yargs-parser": "9.0.2"
           },
           "dependencies": {
+            "ansi-regex": {
+              "version": "3.0.0",
+              "bundled": true,
+              "dev": true
+            },
+            "camelcase": {
+              "version": "4.1.0",
+              "bundled": true,
+              "dev": true
+            },
             "cliui": {
-              "version": "3.2.0",
+              "version": "4.0.0",
               "bundled": true,
               "dev": true,
               "requires": {
-                "string-width": "1.0.2",
-                "strip-ansi": "3.0.1",
+                "string-width": "2.1.1",
+                "strip-ansi": "4.0.0",
                 "wrap-ansi": "2.1.0"
-              },
-              "dependencies": {
-                "string-width": {
-                  "version": "1.0.2",
-                  "bundled": true,
-                  "dev": true,
-                  "requires": {
-                    "code-point-at": "1.1.0",
-                    "is-fullwidth-code-point": "1.0.0",
-                    "strip-ansi": "3.0.1"
-                  }
-                }
+              }
+            },
+            "strip-ansi": {
+              "version": "4.0.0",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "ansi-regex": "3.0.0"
+              }
+            },
+            "yargs-parser": {
+              "version": "9.0.2",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "camelcase": "4.1.0"
               }
             }
           }
         },
         "yargs-parser": {
-          "version": "8.0.0",
+          "version": "8.1.0",
           "bundled": true,
           "dev": true,
           "requires": {
@@ -5171,9 +6348,9 @@
       "dev": true
     },
     "sinon": {
-      "version": "4.4.2",
-      "resolved": "https://registry.npmjs.org/sinon/-/sinon-4.4.2.tgz",
-      "integrity": "sha512-cpOHpnRyY3Dk9dTHBYMfVBB0HUCSKIpxW07X6OGW2NiYPovs4AkcL8Q8MzecbAROjbfRA9esJCmlZgikxDz7DA==",
+      "version": "4.4.5",
+      "resolved": "https://registry.npmjs.org/sinon/-/sinon-4.4.5.tgz",
+      "integrity": "sha512-vsg06IyB4gM5ry1qq13cQQk2U5ZqbL40ygDRNklYx2kokZktakyfinPDJP00WY0WjizRg2p0yhKLuTsCRpwCUA==",
       "dev": true,
       "requires": {
         "@sinonjs/formatio": "2.0.0",
diff --git a/package.json b/package.json
index c174c9c14..76306ae84 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "serverless-webpack",
-  "version": "5.0.0",
+  "version": "5.1.0",
   "description": "Serverless plugin to bundle your javascript with Webpack",
   "main": "index.js",
   "author": "Frank Schmid <fschmid740@googlemail.com>",
@@ -60,12 +60,12 @@
     "eslint": "^4.18.2",
     "eslint-plugin-import": "^2.9.0",
     "eslint-plugin-lodash": "^2.6.1",
-    "eslint-plugin-promise": "^3.6.0",
-    "mocha": "^5.0.2",
+    "eslint-plugin-promise": "^3.7.0",
+    "mocha": "^5.0.4",
     "mockery": "^2.1.0",
-    "nyc": "^11.4.1",
+    "nyc": "^11.6.0",
     "serverless": "^1.26.1",
-    "sinon": "^4.4.2",
+    "sinon": "^4.4.5",
     "sinon-chai": "^3.0.0"
   },
   "peerDependencies": {