diff --git a/lib/carto/tree/rule.js b/lib/carto/tree/rule.js
index 3824eb9aa..61941117d 100644
--- a/lib/carto/tree/rule.js
+++ b/lib/carto/tree/rule.js
@@ -37,7 +37,7 @@ tree.Rule.prototype.updateID = function() {
 };
 
 tree.Rule.prototype.toString = function() {
-    return '[' + tree.Zoom.toString(this.zoom) + '] ' + this.name + ': ' + this.value;
+    return '[' + (this.zoom ? this.zoom.toString() : (new tree.Zoom()).toString()) + '] ' + this.name + ': ' + this.value;
 };
 
 tree.Rule.prototype.validate = function (env) {
diff --git a/package-lock.json b/package-lock.json
index 3cf92aa77..f12bd1af2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -7,8 +7,7 @@
     "@types/color-name": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
-      "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
-      "dev": true
+      "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ=="
     },
     "abbrev": {
       "version": "1.0.9",
@@ -57,28 +56,17 @@
       "integrity": "sha1-YXmX/F9gV2iUxDX5QNgZ4TW4B2I=",
       "dev": true
     },
-    "align-text": {
-      "version": "0.1.4",
-      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
-      "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "kind-of": "^3.0.2",
-        "longest": "^1.0.1",
-        "repeat-string": "^1.5.2"
-      }
-    },
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       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
       "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "ansi-colors": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
-      "integrity": "sha512-JoX0apGbHaUJBNl6yF+p6JAFYZ666/hhCGKN5t9QFjbJQKUU/g8MNbFDbvfrgKXvI1QpZplPOnwIo99lX/AAmA==",
+      "version": "3.2.3",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.2.3.tgz",
+      "integrity": "sha512-LEHHyuhlPY3TmuUYMh2oz89lTShfvgbmzaBcxve9t/9Wuy7Dwf4yoAKcND7KFT1HAQfqZ12qtc+DUrBMeKF9nw==",
       "dev": true
     },
     "ansi-escapes": {
@@ -90,7 +78,8 @@
     "ansi-regex": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
-      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg="
+      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+      "dev": true
     },
     "ansi-styles": {
       "version": "2.2.1",
@@ -116,18 +105,6 @@
         "sprintf-js": "~1.0.2"
       }
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-    "array.prototype.map": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/array.prototype.map/-/array.prototype.map-1.0.2.tgz",
-      "integrity": "sha512-Az3OYxgsa1g7xDYp86l0nnN4bcmuEITGe1rbdEBVkrqkzMgDcbdQ2R7r41pNzti+4NMces3H8gMmuioZUilLgw==",
-      "dev": true,
-      "requires": {
-        "define-properties": "^1.1.3",
-        "es-abstract": "^1.17.0-next.1",
-        "es-array-method-boxes-properly": "^1.0.0",
-        "is-string": "^1.0.4"
-      }
-    },
     "asn1": {
       "version": "0.2.4",
       "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
@@ -246,9 +223,9 @@
       "dev": true
     },
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-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
-      "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0="
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
+      "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg=="
     },
     "caseless": {
       "version": "0.12.0",
@@ -256,17 +233,6 @@
       "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
       "dev": true
     },
-    "center-align": {
-      "version": "0.1.3",
-      "resolved": "https://registry.npmjs.org/center-align/-/center-align-0.1.3.tgz",
-      "integrity": "sha1-qg0yYptu6XIgBBHL1EYckHvCt60=",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "align-text": "^0.1.3",
-        "lazy-cache": "^1.0.3"
-      }
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     "chalk": {
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       "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
@@ -304,19 +270,19 @@
       "dev": true
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-      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.4.2.tgz",
-      "integrity": "sha512-IZHaDeBeI+sZJRX7lGcXsdzgvZqKv6sECqsbErJA4mHWfpRrD8B97kSFN4cQz6nGBGiuFia1MKR4d6c1o8Cv7A==",
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.3.0.tgz",
+      "integrity": "sha512-dGmKLDdT3Gdl7fBUe8XK+gAtGmzy5Fn0XkkWQuYxGIgWVPPse2CxFA5mtrlD0TOHaHjEUqkWNyP1XdHoJES/4A==",
       "dev": true,
       "requires": {
         "anymatch": "~3.1.1",
         "braces": "~3.0.2",
-        "fsevents": "~2.1.2",
+        "fsevents": "~2.1.1",
         "glob-parent": "~5.1.0",
         "is-binary-path": "~2.1.0",
         "is-glob": "~4.0.1",
         "normalize-path": "~3.0.0",
-        "readdirp": "~3.4.0"
+        "readdirp": "~3.2.0"
       }
     },
     "chroma-js": {
@@ -346,13 +312,43 @@
       "dev": true
     },
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-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-4.1.0.tgz",
-      "integrity": "sha1-NIQi2+gtgAswIu709qwQvy5NG0k=",
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-6.0.0.tgz",
+      "integrity": "sha512-t6wbgtoCXvAzst7QgXxJYqPt0usEfbgQdftEPbLL/cvv6HPE5VgvqCuAIDR0NgU52ds6rFwqrgakNLrHEjCbrQ==",
       "requires": {
-        "string-width": "^2.1.1",
-        "strip-ansi": "^4.0.0",
-        "wrap-ansi": "^2.0.0"
+        "string-width": "^4.2.0",
+        "strip-ansi": "^6.0.0",
+        "wrap-ansi": "^6.2.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
+          "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg=="
+        },
+        "is-fullwidth-code-point": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
+          "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg=="
+        },
+        "string-width": {
+          "version": "4.2.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
+          "integrity": "sha512-zUz5JD+tgqtuDjMhwIg5uFVV3dtqZ9yQJlZVfq4I01/K5Paj5UHj7VyrQOJvzawSVlKpObApbfD0Ed6yJc+1eg==",
+          "requires": {
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^6.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+          "requires": {
+            "ansi-regex": "^5.0.0"
+          }
+        }
       }
     },
     "co": {
@@ -361,11 +357,6 @@
       "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
       "dev": true
     },
-    "code-point-at": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
-      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
-    },
     "color-convert": {
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       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
@@ -431,6 +422,7 @@
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       "integrity": "sha1-6L0O/uWPz/b4+UUQoKVUu/ojVEk=",
+      "dev": true,
       "requires": {
         "lru-cache": "^4.0.1",
         "shebang-command": "^1.2.0",
@@ -458,8 +450,7 @@
     "decamelize": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
-      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
-      "dev": true
+      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA="
     },
     "deep-is": {
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@@ -471,7 +462,6 @@
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       "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.1.3.tgz",
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-      "dev": true,
       "requires": {
         "object-keys": "^1.0.12"
       }
@@ -483,9 +473,9 @@
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-      "resolved": "https://registry.npmjs.org/diff/-/diff-4.0.2.tgz",
-      "integrity": "sha512-58lmxKSA4BNyLz+HHMUzlOEpg09FV+ev6ZMe3vJihgdxzgcwZ8VoEEPmALCZG9LmqfVoNMMKpttIYTVG6uDY7A==",
+      "version": "3.5.0",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
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@@ -510,54 +500,76 @@
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-      "dev": true
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A=="
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-      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.17.6.tgz",
-      "integrity": "sha512-Fr89bON3WFyUi5EvAeI48QTWX0AyekGgLA8H+c+7fbfCkJwRWRMLd8CQedNEyJuoYYhmtEqY92pgte1FAhBlhw==",
-      "dev": true,
+      "version": "1.17.7",
+      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.17.7.tgz",
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-        "is-regex": "^1.1.0",
-        "object-inspect": "^1.7.0",
+        "is-callable": "^1.2.2",
+        "is-regex": "^1.1.1",
+        "object-inspect": "^1.8.0",
         "object-keys": "^1.1.1",
-        "object.assign": "^4.1.0",
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         "string.prototype.trimend": "^1.0.1",
         "string.prototype.trimstart": "^1.0.1"
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+        "es-abstract": {
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+          "requires": {
+            "es-to-primitive": "^1.2.1",
+            "function-bind": "^1.1.1",
+            "has": "^1.0.3",
+            "has-symbols": "^1.0.1",
+            "is-callable": "^1.2.2",
+            "is-negative-zero": "^2.0.0",
+            "is-regex": "^1.1.1",
+            "object-inspect": "^1.8.0",
+            "object-keys": "^1.1.1",
+            "object.assign": "^4.1.1",
+            "string.prototype.trimend": "^1.0.1",
+            "string.prototype.trimstart": "^1.0.1"
+          }
+        },
+        "object.assign": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/object.assign/-/object.assign-4.1.1.tgz",
+          "integrity": "sha512-VT/cxmx5yaoHSOTSyrCygIDFco+RsibY2NM0a4RdEeY/4KgqezwFtK1yr3U67xYhqJSlASm2pKhLVzPj2lr4bA==",
+          "requires": {
+            "define-properties": "^1.1.3",
+            "es-abstract": "^1.18.0-next.0",
+            "has-symbols": "^1.0.1",
+            "object-keys": "^1.1.1"
+          },
+          "dependencies": {
+            "es-abstract": {
+              "version": "1.18.0-next.1",
+              "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.18.0-next.1.tgz",
+              "integrity": "sha512-I4UGspA0wpZXWENrdA0uHbnhte683t3qT/1VFH9aX2dA5PPSf6QW5HHXf5HImaqPmjXaVeVk4RGWnaylmV7uAA==",
+              "requires": {
+                "es-to-primitive": "^1.2.1",
+                "function-bind": "^1.1.1",
+                "has": "^1.0.3",
+                "has-symbols": "^1.0.1",
+                "is-callable": "^1.2.2",
+                "is-negative-zero": "^2.0.0",
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+                "object-inspect": "^1.8.0",
+                "object-keys": "^1.1.1",
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+                "string.prototype.trimstart": "^1.0.1"
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@@ -565,7 +577,6 @@
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@@ -781,20 +792,6 @@
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@@ -865,28 +862,21 @@
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-      "integrity": "sha1-SRafHXmTQwZG2mHsxa41XCHJe3M=",
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+      "resolved": "https://registry.npmjs.org/find-up/-/find-up-4.1.0.tgz",
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       "requires": {
-        "locate-path": "^3.0.0"
+        "locate-path": "^5.0.0",
+        "path-exists": "^4.0.0"
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-      "resolved": "https://registry.npmjs.org/flat/-/flat-4.1.0.tgz",
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-      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
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       "requires": {
-        "string-width": "^1.0.1",
-        "strip-ansi": "^3.0.1"
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
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-          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
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-          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+        "ansi-styles": {
+          "version": "4.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.2.1.tgz",
+          "integrity": "sha512-9VGjrMsG1vePxcSweQsN20KY/c4zN0h9fLjqAbwbPfahM3t+NL+M9HC8xeXG2I8pX5NoamTGNuomEUFI7fcUjA==",
           "requires": {
-            "number-is-nan": "^1.0.0"
+            "@types/color-name": "^1.1.1",
+            "color-convert": "^2.0.1"
           }
         },
+        "color-convert": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+          "requires": {
+            "color-name": "~1.1.4"
+          }
+        },
+        "color-name": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+          "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA=="
+        },
+        "is-fullwidth-code-point": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
+          "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg=="
+        },
         "string-width": {
-          "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
-          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "version": "4.2.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
+          "integrity": "sha512-zUz5JD+tgqtuDjMhwIg5uFVV3dtqZ9yQJlZVfq4I01/K5Paj5UHj7VyrQOJvzawSVlKpObApbfD0Ed6yJc+1eg==",
           "requires": {
-            "code-point-at": "^1.0.0",
-            "is-fullwidth-code-point": "^1.0.0",
-            "strip-ansi": "^3.0.0"
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^6.0.0"
           }
         },
         "strip-ansi": {
-          "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
-          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
           "requires": {
-            "ansi-regex": "^2.0.0"
+            "ansi-regex": "^5.0.0"
           }
         }
       }
@@ -3136,11 +2815,6 @@
         "mkdirp": "^0.5.1"
       }
     },
-    "xregexp": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/xregexp/-/xregexp-4.0.0.tgz",
-      "integrity": "sha1-5pgYneSd0qGMxWh7BeF8jkOUMCA="
-    },
     "y18n": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
@@ -3149,56 +2823,75 @@
     "yallist": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
-      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI="
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
     },
     "yargs": {
-      "version": "12.0.1",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.1.tgz",
-      "integrity": "sha1-ZDLlYSO7Tnw1YhFUAemDdAYCYcI=",
-      "requires": {
-        "cliui": "^4.0.0",
-        "decamelize": "^2.0.0",
-        "find-up": "^3.0.0",
-        "get-caller-file": "^1.0.1",
-        "os-locale": "^2.0.0",
+      "version": "15.4.1",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-15.4.1.tgz",
+      "integrity": "sha512-aePbxDmcYW++PaqBsJ+HYUFwCdv4LVvdnhBy78E57PIor8/OVvhMrADFFEDh8DHDFRv/O9i3lPhsENjO7QX0+A==",
+      "requires": {
+        "cliui": "^6.0.0",
+        "decamelize": "^1.2.0",
+        "find-up": "^4.1.0",
+        "get-caller-file": "^2.0.1",
         "require-directory": "^2.1.1",
-        "require-main-filename": "^1.0.1",
+        "require-main-filename": "^2.0.0",
         "set-blocking": "^2.0.0",
-        "string-width": "^2.0.0",
+        "string-width": "^4.2.0",
         "which-module": "^2.0.0",
-        "y18n": "^3.2.1 || ^4.0.0",
-        "yargs-parser": "^10.1.0"
+        "y18n": "^4.0.0",
+        "yargs-parser": "^18.1.2"
       },
       "dependencies": {
-        "decamelize": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-2.0.0.tgz",
-          "integrity": "sha1-ZW17vICUxMeI6lPFhAkIycfQY8c=",
+        "ansi-regex": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
+          "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg=="
+        },
+        "is-fullwidth-code-point": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
+          "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg=="
+        },
+        "string-width": {
+          "version": "4.2.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
+          "integrity": "sha512-zUz5JD+tgqtuDjMhwIg5uFVV3dtqZ9yQJlZVfq4I01/K5Paj5UHj7VyrQOJvzawSVlKpObApbfD0Ed6yJc+1eg==",
+          "requires": {
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^6.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
           "requires": {
-            "xregexp": "4.0.0"
+            "ansi-regex": "^5.0.0"
           }
         }
       }
     },
     "yargs-parser": {
-      "version": "10.1.0",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-10.1.0.tgz",
-      "integrity": "sha1-cgImW4n36eny5XZeD+c1qQXtuqg=",
+      "version": "18.1.3",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-18.1.3.tgz",
+      "integrity": "sha512-o50j0JeToy/4K6OZcaQmW6lyXXKhq7csREXcDwk2omFPJEwUNOVtJKvmDr9EI1fAJZUyZcRF7kxGBWmRXudrCQ==",
       "requires": {
-        "camelcase": "^4.1.0"
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
       }
     },
     "yargs-unparser": {
-      "version": "1.6.1",
-      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.1.tgz",
-      "integrity": "sha512-qZV14lK9MWsGCmcr7u5oXGH0dbGqZAIxTDrWXZDo5zUr6b6iUmelNKO6x6R1dQT24AH3LgRxJpr8meWy2unolA==",
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
+      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
       "dev": true,
       "requires": {
-        "camelcase": "^5.3.1",
-        "decamelize": "^1.2.0",
         "flat": "^4.1.0",
-        "is-plain-obj": "^1.1.0",
-        "yargs": "^14.2.3"
+        "lodash": "^4.17.15",
+        "yargs": "^13.3.0"
       },
       "dependencies": {
         "ansi-regex": {
@@ -3216,12 +2909,6 @@
             "color-convert": "^1.9.0"
           }
         },
-        "camelcase": {
-          "version": "5.3.1",
-          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
-          "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
-          "dev": true
-        },
         "cliui": {
           "version": "5.0.0",
           "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
@@ -3239,16 +2926,38 @@
           "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
           "dev": true
         },
-        "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
+        "find-up": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^3.0.0"
+          }
         },
-        "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==",
+        "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"
+          }
+        },
+        "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"
+          }
+        },
+        "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
         },
         "string-width": {
@@ -3283,13 +2992,12 @@
           }
         },
         "yargs": {
-          "version": "14.2.3",
-          "resolved": "https://registry.npmjs.org/yargs/-/yargs-14.2.3.tgz",
-          "integrity": "sha512-ZbotRWhF+lkjijC/VhmOT9wSgyBQ7+zr13+YLkhfsSiTriYsMzkTUFP18pFhWwBeMa5gUc1MzbhrO6/VB7c9Xg==",
+          "version": "13.3.2",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+          "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
           "dev": true,
           "requires": {
             "cliui": "^5.0.0",
-            "decamelize": "^1.2.0",
             "find-up": "^3.0.0",
             "get-caller-file": "^2.0.1",
             "require-directory": "^2.1.1",
@@ -3298,13 +3006,13 @@
             "string-width": "^3.0.0",
             "which-module": "^2.0.0",
             "y18n": "^4.0.0",
-            "yargs-parser": "^15.0.1"
+            "yargs-parser": "^13.1.2"
           }
         },
         "yargs-parser": {
-          "version": "15.0.1",
-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-15.0.1.tgz",
-          "integrity": "sha512-0OAMV2mAZQrs3FkNpDQcBk1x5HXb8X4twADss4S0Iuk+2dGnLOE/fRHrsYm542GduMveyA77OF4wrNJuanRCWw==",
+          "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",
diff --git a/package.json b/package.json
index 8a52a5987..b581843ba 100644
--- a/package.json
+++ b/package.json
@@ -35,16 +35,16 @@
   "dependencies": {
     "chroma-js": "~1.3.5",
     "hsluv": "~0.0.1",
-    "js-yaml": "~3.12.0",
+    "js-yaml": "~3.14.0",
     "lodash": "~4.17.10",
     "mapnik-reference": "~8.10.0",
     "semver": "~5.6.0",
-    "yargs": "~12.0.1"
+    "yargs": "~15.4.1"
   },
   "devDependencies": {
     "coveralls": "~3.0.0",
     "istanbul": "~0.4.5",
-    "mocha": "~8.1.3",
+    "mocha": "~7.2.0",
     "mocha-eslint": "^4.0.0",
     "sax": "~1.2.1"
   },
diff --git a/test/rule.test.js b/test/rule.test.js
new file mode 100644
index 000000000..887d8176f
--- /dev/null
+++ b/test/rule.test.js
@@ -0,0 +1,16 @@
+var assert = require('assert');
+var tree = require('../lib/carto/tree.js');
+
+describe('Rule', function() {
+    describe('To string', function() {
+        it('with zoom', function() {
+            const rule = new tree.Rule(new tree.Reference(null), 'name', 'value', 'index', 'filename');
+            rule.zoom = (new tree.Zoom()).setZoom((1 << 2 | 1 << 3 | 1 << 4))
+            assert.equal(rule.toString(), '[..XXX.....................] name: value')
+        });
+        it('without zoom', function() {
+            const rule = new tree.Rule(new tree.Reference(null), 'name', 'value', 'index', 'filename');
+            assert.equal(rule.toString(), '[..........................] name: value')
+        });
+    });
+});