Index: src/wp-content/themes/twentynineteen/package-lock.json
===================================================================
--- src/wp-content/themes/twentynineteen/package-lock.json	(revision 45576)
+++ src/wp-content/themes/twentynineteen/package-lock.json	(working copy)
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+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
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+      "requires": {
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-      "integrity": "sha1-u6Y8qGGUiZT/MHc2CJ47lgJsKk8=",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
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@@ -4365,12 +4329,49 @@
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-      "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
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+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
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+          "dev": true
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+        "is-fullwidth-code-point": {
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+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "dev": true,
+          "requires": {
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+          }
+        },
+        "string-width": {
+          "version": "1.0.2",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "dev": true,
+          "requires": {
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
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+          }
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@@ -4379,18 +4380,12 @@
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     },
-    "xregexp": {
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-      "resolved": "https://registry.npmjs.org/xregexp/-/xregexp-4.0.0.tgz",
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+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
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@@ -4398,49 +4393,33 @@
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-      "integrity": "sha1-a6MY6xaWFyf10oT46gA+jWFU0Mg=",
+      "version": "12.0.5",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
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-        "cliui": "^3.2.0",
-        "decamelize": "^1.1.1",
+        "cliui": "^4.0.0",
+        "decamelize": "^1.2.0",
+        "find-up": "^3.0.0",
         "get-caller-file": "^1.0.1",
-        "os-locale": "^1.4.0",
-        "read-pkg-up": "^1.0.1",
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-          "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo=",
-          "dev": true
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+        "string-width": "^2.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^3.2.1 || ^4.0.0",
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-      "integrity": "sha1-J17PDX/+Bcd+ZOfIbkzZS/DhIoo=",
+      "version": "11.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
+      "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
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-          "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo=",
-          "dev": true
-        }
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
       }
     }
   }
Index: src/wp-content/themes/twentynineteen/package.json
===================================================================
--- src/wp-content/themes/twentynineteen/package.json	(revision 45576)
+++ src/wp-content/themes/twentynineteen/package.json	(working copy)
@@ -7,12 +7,12 @@
   },
   "homepage": "https://github.com/WordPress/twentynineteen#readme",
   "devDependencies": {
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-    "autoprefixer": "^9.1.5",
-    "chokidar-cli": "^1.2.1",
-    "node-sass": "^4.9.3",
+    "@wordpress/browserslist-config": "^2.5.0",
+    "autoprefixer": "^9.6.0",
+    "chokidar-cli": "^1.2.2",
+    "node-sass": "^4.12.0",
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-    "postcss-cli": "^6.0.1",
+    "postcss-cli": "^6.1.2",
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