diff --git a/chapter04/gulp-grunt-webpack-compare/package-lock.json b/chapter04/gulp-grunt-webpack-compare/package-lock.json
index 02a6d2d..6a49419 100644
--- a/chapter04/gulp-grunt-webpack-compare/package-lock.json
+++ b/chapter04/gulp-grunt-webpack-compare/package-lock.json
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+              "dev": true,
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+              }
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+            "strip-ansi": "^5.2.0",
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+          "dev": true,
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+            "path-key": "^2.0.1",
+            "semver": "^5.5.0",
+            "shebang-command": "^1.2.0",
+            "which": "^1.2.9"
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+          "dev": true,
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+          "dev": true,
+          "requires": {
+            "detect-file": "^1.0.0",
+            "is-glob": "^4.0.0",
+            "micromatch": "^3.0.4",
+            "resolve-dir": "^1.0.1"
+          }
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+        "get-caller-file": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
+          "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
+          "dev": true
+        },
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+          "resolved": "https://registry.npmjs.org/global-modules/-/global-modules-2.0.0.tgz",
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+          "dev": true,
+          "requires": {
+            "global-prefix": "^3.0.0"
+          }
+        },
+        "global-prefix": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/global-prefix/-/global-prefix-3.0.0.tgz",
+          "integrity": "sha512-awConJSVCHVGND6x3tmMaKcQvwXLhjdkmomy2W+Goaui8YPgYgXJZewhg3fWC+DlfqqQuWg8AwqjGTD2nAPVWg==",
+          "dev": true,
+          "requires": {
+            "ini": "^1.3.5",
+            "kind-of": "^6.0.2",
+            "which": "^1.3.1"
+          }
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+        "interpret": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/interpret/-/interpret-1.2.0.tgz",
+          "integrity": "sha512-mT34yGKMNceBQUoVn7iCDKDntA7SC6gycMAWzGx1z/CMCTV7b2AAtXlo3nRyHZ1FelRkQbQjprHSYGwzLtkVbw==",
+          "dev": true
+        },
+        "invert-kv": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/invert-kv/-/invert-kv-2.0.0.tgz",
+          "integrity": "sha512-wPVv/y/QQ/Uiirj/vh3oP+1Ww+AWehmi1g5fFWGPF6IpCBCDVrhgHRMvrLfdYcwDh3QJbGXDW4JAuzxElLSqKA==",
+          "dev": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+          "dev": true
+        },
+        "is-glob": {
+          "version": "4.0.1",
+          "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-4.0.1.tgz",
+          "integrity": "sha512-5G0tKtBTFImOqDnLB2hG6Bp2qcKEFduo4tZu9MT/H6NQv/ghhy30o55ufafxJ/LdH79LLs2Kfrn85TLKyA7BUg==",
+          "dev": true,
+          "requires": {
+            "is-extglob": "^2.1.1"
+          }
+        },
+        "json5": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/json5/-/json5-1.0.1.tgz",
+          "integrity": "sha512-aKS4WQjPenRxiQsC93MNfjx+nbF4PAdYzmd/1JIj8HYzqfbu86beTuNgXDzPknWk0n0uARlyewZo4s++ES36Ow==",
+          "dev": true,
+          "requires": {
+            "minimist": "^1.2.0"
+          }
+        },
+        "lcid": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/lcid/-/lcid-2.0.0.tgz",
+          "integrity": "sha512-avPEb8P8EGnwXKClwsNUgryVjllcRqtMYa49NTsbQagYuT1DcXnl1915oxWjoyGrXR6zH/Y0Zc96xWsPcoDKeA==",
+          "dev": true,
+          "requires": {
+            "invert-kv": "^2.0.0"
+          }
+        },
+        "loader-utils": {
+          "version": "1.2.3",
+          "resolved": "https://registry.npmjs.org/loader-utils/-/loader-utils-1.2.3.tgz",
+          "integrity": "sha512-fkpz8ejdnEMG3s37wGL07iSBDg99O9D5yflE9RGNH3hRdx9SOwYfnGYdZOUIZitN8E+E2vkq3MUMYMvPYl5ZZA==",
+          "dev": true,
+          "requires": {
+            "big.js": "^5.2.2",
+            "emojis-list": "^2.0.0",
+            "json5": "^1.0.1"
+          }
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "os-locale": {
+          "version": "3.1.0",
+          "resolved": "http://registry.npmjs.org/os-locale/-/os-locale-3.1.0.tgz",
+          "integrity": "sha512-Z8l3R4wYWM40/52Z+S265okfFj8Kt2cC2MKY+xNi3kFs+XGI7WXu/I309QQQYbRW4ijiZ+yxs9pqEhJh0DqW3Q==",
+          "dev": true,
+          "requires": {
+            "execa": "^1.0.0",
+            "lcid": "^2.0.0",
+            "mem": "^4.0.0"
+          }
+        },
+        "p-limit": {
+          "version": "2.2.2",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.2.2.tgz",
+          "integrity": "sha512-WGR+xHecKTr7EbUEhyLSh5Dube9JtdiG78ufaeLxTgpudf/20KqyMioIUZJAezlTIi6evxuoUs9YXc11cU+yzQ==",
+          "dev": true,
+          "requires": {
+            "p-try": "^2.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.0.0"
+          }
+        },
+        "p-try": {
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
+          "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ==",
+          "dev": true
+        },
+        "path-exists": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
+          "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
+          "dev": true
+        },
+        "require-main-filename": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-2.0.0.tgz",
+          "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==",
+          "dev": true
+        },
+        "semver": {
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        },
+        "supports-color": {
+          "version": "6.1.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.1.0.tgz",
+          "integrity": "sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^3.0.0"
+          }
+        },
+        "which-module": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+          "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
+          "dev": true
+        },
+        "wrap-ansi": {
+          "version": "5.1.0",
+          "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
+          "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^3.2.0",
+            "string-width": "^3.0.0",
+            "strip-ansi": "^5.0.0"
+          }
+        },
+        "y18n": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+          "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+          "dev": true
+        },
+        "yargs": {
+          "version": "13.2.4",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.4.tgz",
+          "integrity": "sha512-HG/DWAJa1PAnHT9JAhNa8AbAv3FPaiLzioSjCcmuXXhP8MlpHO5vwls4g4j6n30Z74GVQj8Xa62dWVx1QCGklg==",
+          "dev": true,
+          "requires": {
+            "cliui": "^5.0.0",
+            "find-up": "^3.0.0",
+            "get-caller-file": "^2.0.1",
+            "os-locale": "^3.1.0",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^2.0.0",
+            "set-blocking": "^2.0.0",
+            "string-width": "^3.0.0",
+            "which-module": "^2.0.0",
+            "y18n": "^4.0.0",
+            "yargs-parser": "^13.1.0"
+          }
+        },
+        "yargs-parser": {
+          "version": "13.1.2",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+          "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
+          "dev": true,
+          "requires": {
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
+          }
+        }
+      }
+    },
     "webpack-sources": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/webpack-sources/-/webpack-sources-1.2.0.tgz",
diff --git a/chapter04/gulp-grunt-webpack-compare/yarn.lock b/chapter04/gulp-grunt-webpack-compare/yarn.lock
index c936c43..9ace0d6 100644
--- a/chapter04/gulp-grunt-webpack-compare/yarn.lock
+++ b/chapter04/gulp-grunt-webpack-compare/yarn.lock
@@ -149,8 +149,8 @@ acorn-dynamic-import@^3.0.0:
     acorn "^5.0.0"
 
 acorn@^5.0.0, acorn@^5.6.2:
-  version "5.7.2"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.2.tgz#91fa871883485d06708800318404e72bfb26dcc5"
+  version "5.7.4"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.4.tgz#3e8d8a9947d0599a1796d10225d7432f4a4acf5e"
 
 ajv-errors@^1.0.0:
   version "1.0.0"
@@ -523,7 +523,7 @@ buffer-xor@^1.0.3:
 
 buffer@^4.3.0:
   version "4.9.1"
-  resolved "http://registry.npmjs.org/buffer/-/buffer-4.9.1.tgz#6d1bb601b07a4efced97094132093027c95bc298"
+  resolved "https://registry.npmjs.org/buffer/-/buffer-4.9.1.tgz#6d1bb601b07a4efced97094132093027c95bc298"
   dependencies:
     base64-js "^1.0.2"
     ieee754 "^1.1.4"
@@ -604,7 +604,7 @@ caseless@~0.12.0:
 
 chalk@^1.0.0, chalk@^1.1.1, chalk@^1.1.3:
   version "1.1.3"
-  resolved "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz#a8115c55e4a702fe4d150abd3872822a7e09fc98"
+  resolved "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz#a8115c55e4a702fe4d150abd3872822a7e09fc98"
   dependencies:
     ansi-styles "^2.2.1"
     escape-string-regexp "^1.0.2"
@@ -1197,7 +1197,7 @@ esutils@^2.0.2:
 
 eventemitter2@~0.4.13:
   version "0.4.14"
-  resolved "http://registry.npmjs.org/eventemitter2/-/eventemitter2-0.4.14.tgz#8f61b75cde012b2e9eb284d4545583b5643b61ab"
+  resolved "https://registry.npmjs.org/eventemitter2/-/eventemitter2-0.4.14.tgz#8f61b75cde012b2e9eb284d4545583b5643b61ab"
 
 events@^1.0.0:
   version "1.1.1"
@@ -2514,7 +2514,7 @@ lodash@^4.0.0, lodash@^4.17.10, lodash@~4.17.10, lodash@~4.17.5:
 
 lodash@~1.0.1:
   version "1.0.2"
-  resolved "http://registry.npmjs.org/lodash/-/lodash-1.0.2.tgz#8f57560c83b59fc270bd3d561b690043430e2551"
+  resolved "https://registry.npmjs.org/lodash/-/lodash-1.0.2.tgz#8f57560c83b59fc270bd3d561b690043430e2551"
 
 long@4.0.0:
   version "4.0.0"
@@ -2692,11 +2692,11 @@ minimatch@~0.2.11:
 
 minimist@0.0.8:
   version "0.0.8"
-  resolved "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
+  resolved "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
 
 minimist@^1.1.0, minimist@^1.1.3, minimist@^1.2.0:
   version "1.2.0"
-  resolved "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
+  resolved "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
 
 minipass@^2.2.1, minipass@^2.3.3:
   version "2.3.4"
@@ -2742,7 +2742,7 @@ mixin-object@^2.0.1:
 
 "mkdirp@>=0.5 0", mkdirp@^0.5.0, mkdirp@^0.5.1, mkdirp@~0.5.0, mkdirp@~0.5.1:
   version "0.5.1"
-  resolved "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
+  resolved "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
   dependencies:
     minimist "0.0.8"
 
@@ -3059,7 +3059,7 @@ os-homedir@^1.0.0:
 
 os-locale@^1.4.0:
   version "1.4.0"
-  resolved "http://registry.npmjs.org/os-locale/-/os-locale-1.4.0.tgz#20f9f17ae29ed345e8bde583b13d2009803c14d9"
+  resolved "https://registry.npmjs.org/os-locale/-/os-locale-1.4.0.tgz#20f9f17ae29ed345e8bde583b13d2009803c14d9"
   dependencies:
     lcid "^1.0.0"
 
@@ -4493,7 +4493,7 @@ worker-farm@^1.5.2:
 
 wrap-ansi@^2.0.0:
   version "2.1.0"
-  resolved "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz#d8fc3d284dd05794fe84973caecdd1cf824fdd85"
+  resolved "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz#d8fc3d284dd05794fe84973caecdd1cf824fdd85"
   dependencies:
     string-width "^1.0.1"
     strip-ansi "^3.0.1"