diff --git a/package-lock.json b/package-lock.json
index 34b63a65a..4bff7aec0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,8 +8,8 @@
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       "license": "(LGPL-2.0 OR MIT)",
       "devDependencies": {
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-        "@stryker-mutator/javascript-mutator": "^3.3.1",
+        "@stryker-mutator/core": "^4.2.0",
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@@ -113,6 +113,22 @@
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+      "resolved": "https://registry.npmjs.org/@babel/helper-create-class-features-plugin/-/helper-create-class-features-plugin-7.12.1.tgz",
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+      "dev": true,
+      "dependencies": {
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+        "@babel/helper-member-expression-to-functions": "^7.12.1",
+        "@babel/helper-optimise-call-expression": "^7.10.4",
+        "@babel/helper-replace-supers": "^7.12.1",
+        "@babel/helper-split-export-declaration": "^7.10.4"
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@@ -219,6 +235,12 @@
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       "dev": true
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+    "node_modules/@babel/helper-validator-option": {
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+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-option/-/helper-validator-option-7.12.1.tgz",
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@@ -294,6 +316,46 @@
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+      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-class-properties/-/plugin-proposal-class-properties-7.12.1.tgz",
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+      "dependencies": {
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+      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-decorators/-/plugin-proposal-decorators-7.12.1.tgz",
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+      "dev": true,
+      "dependencies": {
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+        "@babel/helper-plugin-utils": "^7.10.4",
+        "@babel/plugin-syntax-decorators": "^7.12.1"
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+    "node_modules/@babel/plugin-proposal-private-methods": {
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+      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-private-methods/-/plugin-proposal-private-methods-7.12.1.tgz",
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+      "dev": true,
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@@ -330,6 +392,18 @@
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+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-decorators/-/plugin-syntax-decorators-7.12.1.tgz",
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@@ -438,6 +512,46 @@
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+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-typescript/-/plugin-syntax-typescript-7.12.1.tgz",
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+      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-typescript/-/plugin-transform-typescript-7.12.1.tgz",
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+      "dependencies": {
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+        "@babel/helper-plugin-utils": "^7.10.4",
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+    "node_modules/@babel/preset-typescript": {
+      "version": "7.12.7",
+      "resolved": "https://registry.npmjs.org/@babel/preset-typescript/-/preset-typescript-7.12.7.tgz",
+      "integrity": "sha512-nOoIqIqBmHBSEgBXWR4Dv/XBehtIFcw9PqZw6rFYuKrzsZmOQm3PR5siLBnKZFEsDb03IegG8nSjU/iXXXYRmw==",
+      "dev": true,
+      "dependencies": {
+        "@babel/helper-plugin-utils": "^7.10.4",
+        "@babel/helper-validator-option": "^7.12.1",
+        "@babel/plugin-transform-typescript": "^7.12.1"
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       "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.10.4.tgz",
@@ -1129,12 +1243,12 @@
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+      "resolved": "https://registry.npmjs.org/@stryker-mutator/api/-/api-4.2.0.tgz",
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       "dependencies": {
-        "mutation-testing-report-schema": "~1.3.0",
+        "mutation-testing-report-schema": "~1.4.3",
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@@ -1143,36 +1257,39 @@
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+      "resolved": "https://registry.npmjs.org/@stryker-mutator/core/-/core-4.2.0.tgz",
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-        "ajv": "^6.12.0",
-        "chalk": "~4.0.0",
-        "commander": "~5.1.0",
+        "@stryker-mutator/api": "4.2.0",
+        "@stryker-mutator/instrumenter": "4.2.0",
+        "@stryker-mutator/util": "4.2.0",
+        "ajv": "~6.12.0",
+        "chalk": "~4.1.0",
+        "commander": "~6.2.0",
+        "execa": "~4.0.2",
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-        "lodash.flatmap": "^4.5.0",
-        "lodash.groupby": "^4.6.0",
-        "log4js": "6.2.1",
+        "inquirer": "~7.3.2",
+        "lodash.flatmap": "~4.5.0",
+        "lodash.groupby": "~4.6.0",
+        "log4js": "~6.2.1",
+        "minimatch": "~3.0.4",
         "mkdirp": "~1.0.3",
-        "mutation-testing-elements": "~1.3.0",
-        "mutation-testing-metrics": "~1.3.0",
+        "mutation-testing-elements": "~1.4.3",
+        "mutation-testing-metrics": "~1.4.3",
+        "npm-run-path": "~4.0.1",
         "progress": "~2.0.0",
         "rimraf": "~3.0.0",
         "rxjs": "~6.6.0",
         "source-map": "~0.7.3",
         "surrial": "~2.0.2",
-        "tree-kill": "~1.2.0",
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         "tslib": "~2.0.0",
-        "typed-inject": "~2.2.1",
-        "typed-rest-client": "~1.7.1"
+        "typed-inject": "~3.0.0",
+        "typed-rest-client": "~1.8.0"
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       "bin": {
         "stryker": "bin/stryker"
@@ -1182,9 +1299,9 @@
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@@ -1197,6 +1314,58 @@
         "url": "https://github.com/chalk/chalk?sponsor=1"
       }
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+    "node_modules/@stryker-mutator/core/node_modules/cross-spawn": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.3.tgz",
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+      "dependencies": {
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+        "shebang-command": "^2.0.0",
+        "which": "^2.0.1"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
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+    "node_modules/@stryker-mutator/core/node_modules/execa": {
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+      "resolved": "https://registry.npmjs.org/execa/-/execa-4.0.3.tgz",
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+        "get-stream": "^5.0.0",
+        "human-signals": "^1.1.1",
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+        "onetime": "^5.1.0",
+        "signal-exit": "^3.0.2",
+        "strip-final-newline": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sindresorhus/execa?sponsor=1"
+      }
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+    "node_modules/@stryker-mutator/core/node_modules/get-stream": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-5.2.0.tgz",
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+      "dependencies": {
+        "pump": "^3.0.0"
+      },
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+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
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@@ -1206,101 +1375,101 @@
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@@ -17125,15 +17451,15 @@
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diff --git a/package.json b/package.json
index 104ade89d..7c9b0ee50 100644
--- a/package.json
+++ b/package.json
@@ -38,8 +38,8 @@
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