diff --git a/gen-tsd.json b/gen-tsd.json
deleted file mode 100644
index 475d21b2cf..0000000000
--- a/gen-tsd.json
+++ /dev/null
@@ -1,46 +0,0 @@
-{
-  "excludeFiles": [
-    "dist/**",
-    "externs/**",
-    "gulpfile.js",
-    "test/**",
-    "util/**",
-    "index.html"
-  ],
-  "excludeIdentifiers": [
-    "templatizedBase",
-    "setAttribute"
-  ],
-  "removeReferences": [
-    "../shadycss/apply-shim.d.ts",
-    "../shadycss/custom-style-interface.d.ts"
-  ],
-  "renameTypes": {
-    "Polymer_PropertyEffects": "PropertyEffects",
-    "PolymerDomApi": "DomApi",
-    "PolymerDomApi.ObserveHandle": "FlattenedNodesObserver"
-  },
-  "autoImport": {
-    "./interfaces": [
-      "PolymerElementPropertiesMeta",
-      "PolymerElementProperties",
-      "PolymerInit",
-      "StampedTemplate",
-      "NodeInfo",
-      "TemplateInfo",
-      "LiteralBindingPart",
-      "MethodArg",
-      "MethodSignature",
-      "ExpressionBindingPart",
-      "BindingPart",
-      "Binding",
-      "AsyncInterface",
-      "GestureRecognizer",
-      "IdleDeadline",
-      "PolymerElementConstructor"
-    ],
-    "./lib/utils/debounce.js": [
-      "Debouncer"
-    ]
-  }
-}
diff --git a/lib/legacy/legacy-element-mixin.d.ts b/lib/legacy/legacy-element-mixin.d.ts
index 87a95f00c7..93a70881be 100644
--- a/lib/legacy/legacy-element-mixin.d.ts
+++ b/lib/legacy/legacy-element-mixin.d.ts
@@ -115,6 +115,13 @@ interface LegacyElementMixin extends ElementMixin, PropertyEffects, TemplateStam
    */
   created(): void;
 
+  /**
+   * Sets the value of an attribute.
+   * @param name The name of the attribute to change.
+   * @param value The new attribute value.
+   */
+  setAttribute(name: string, value: string): void;
+
   /**
    * Removes an attribute.
    *
diff --git a/lib/legacy/legacy-element-mixin.js b/lib/legacy/legacy-element-mixin.js
index c443ca7ef8..efbbcc92e0 100644
--- a/lib/legacy/legacy-element-mixin.js
+++ b/lib/legacy/legacy-element-mixin.js
@@ -145,12 +145,6 @@ export const LegacyElementMixin = dedupingMixin((base) => {
 
     /**
      * Sets the value of an attribute.
-     *
-     * NOTE: This function is explicitly excluded when running
-     * gen-typescript-declarations because the function it overrides has
-     * different signatures in Closure and TypeScript's built-in types. This
-     * function's signature should match the signature from Closure:
-     * https://github.com/google/closure-compiler/blob/8972fd4e9b0689e7ebdeea53580521c819f6aecc/externs/browser/w3c_dom1.js#L686-L694
      * @override
      * @param {string} name The name of the attribute to change.
      * @param {string|number|boolean|!TrustedHTML|!TrustedScriptURL|!TrustedURL} value The new attribute value.
diff --git a/package-lock.json b/package-lock.json
index 93199ea4a2..fc6677cf2f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,22 +14,23 @@
       }
     },
     "@babel/core": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.8.3.tgz",
-      "integrity": "sha512-4XFkf8AwyrEG7Ziu3L2L0Cv+WyY47Tcsp70JFmpftbAA1K7YL/sgE9jh9HyNj08Y/U50ItUchpN0w6HxAoX1rA==",
+      "version": "7.9.6",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.9.6.tgz",
+      "integrity": "sha512-nD3deLvbsApbHAHttzIssYqgb883yU/d9roe4RZymBCDaZryMJDbptVpEpeQuRh4BJ+SYI8le9YGxKvFEvl1Wg==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.8.3",
-        "@babel/generator": "^7.8.3",
-        "@babel/helpers": "^7.8.3",
-        "@babel/parser": "^7.8.3",
-        "@babel/template": "^7.8.3",
-        "@babel/traverse": "^7.8.3",
-        "@babel/types": "^7.8.3",
+        "@babel/generator": "^7.9.6",
+        "@babel/helper-module-transforms": "^7.9.0",
+        "@babel/helpers": "^7.9.6",
+        "@babel/parser": "^7.9.6",
+        "@babel/template": "^7.8.6",
+        "@babel/traverse": "^7.9.6",
+        "@babel/types": "^7.9.6",
         "convert-source-map": "^1.7.0",
         "debug": "^4.1.0",
         "gensync": "^1.0.0-beta.1",
-        "json5": "^2.1.0",
+        "json5": "^2.1.2",
         "lodash": "^4.17.13",
         "resolve": "^1.3.2",
         "semver": "^5.4.1",
@@ -37,20 +38,14 @@
       },
       "dependencies": {
         "json5": {
-          "version": "2.1.1",
-          "resolved": "https://registry.npmjs.org/json5/-/json5-2.1.1.tgz",
-          "integrity": "sha512-l+3HXD0GEI3huGq1njuqtzYK8OYJyXMkOLtQ53pjWh89tvWS2h6l+1zMkYWqlb57+SiQodKZyvMEFb2X+KrFhQ==",
+          "version": "2.1.3",
+          "resolved": "https://registry.npmjs.org/json5/-/json5-2.1.3.tgz",
+          "integrity": "sha512-KXPvOm8K9IJKFM0bmdn8QXh7udDh1g/giieX0NLCaMnb4hEiVFqnop2ImTXCc5e0/oHz3LTqmHGtExn5hfMkOA==",
           "dev": true,
           "requires": {
-            "minimist": "^1.2.0"
+            "minimist": "^1.2.5"
           }
         },
-        "minimist": {
-          "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
-          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
-          "dev": true
-        },
         "source-map": {
           "version": "0.5.7",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
@@ -60,12 +55,12 @@
       }
     },
     "@babel/generator": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.8.3.tgz",
-      "integrity": "sha512-WjoPk8hRpDRqqzRpvaR8/gDUPkrnOOeuT2m8cNICJtZH6mwaCo3v0OKMI7Y6SM1pBtyijnLtAL0HDi41pf41ug==",
+      "version": "7.9.6",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.9.6.tgz",
+      "integrity": "sha512-+htwWKJbH2bL72HRluF8zumBxzuX0ZZUFl3JLNyoUjM/Ho8wnVpPXM6aUz8cfKDqQ/h7zHqKt4xzJteUosckqQ==",
       "dev": true,
       "requires": {
-        "@babel/types": "^7.8.3",
+        "@babel/types": "^7.9.6",
         "jsesc": "^2.5.1",
         "lodash": "^4.17.13",
         "source-map": "^0.5.0"
@@ -98,25 +93,15 @@
         "@babel/types": "^7.8.3"
       }
     },
-    "@babel/helper-call-delegate": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/helper-call-delegate/-/helper-call-delegate-7.8.3.tgz",
-      "integrity": "sha512-6Q05px0Eb+N4/GTyKPPvnkig7Lylw+QzihMpws9iiZQv7ZImf84ZsZpQH7QoWN4n4tm81SnSzPgHw2qtO0Zf3A==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-hoist-variables": "^7.8.3",
-        "@babel/traverse": "^7.8.3",
-        "@babel/types": "^7.8.3"
-      }
-    },
     "@babel/helper-create-regexp-features-plugin": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/helper-create-regexp-features-plugin/-/helper-create-regexp-features-plugin-7.8.3.tgz",
-      "integrity": "sha512-Gcsm1OHCUr9o9TcJln57xhWHtdXbA2pgQ58S0Lxlks0WMGNXuki4+GLfX0p+L2ZkINUGZvfkz8rzoqJQSthI+Q==",
+      "version": "7.8.8",
+      "resolved": "https://registry.npmjs.org/@babel/helper-create-regexp-features-plugin/-/helper-create-regexp-features-plugin-7.8.8.tgz",
+      "integrity": "sha512-LYVPdwkrQEiX9+1R29Ld/wTrmQu1SSKYnuOk3g0CkcZMA1p0gsNxJFj/3gBdaJ7Cg0Fnek5z0DsMULePP7Lrqg==",
       "dev": true,
       "requires": {
+        "@babel/helper-annotate-as-pure": "^7.8.3",
         "@babel/helper-regex": "^7.8.3",
-        "regexpu-core": "^4.6.0"
+        "regexpu-core": "^4.7.0"
       }
     },
     "@babel/helper-define-map": {
@@ -141,14 +126,14 @@
       }
     },
     "@babel/helper-function-name": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.8.3.tgz",
-      "integrity": "sha512-BCxgX1BC2hD/oBlIFUgOCQDOPV8nSINxCwM3o93xP4P9Fq6aV5sgv2cOOITDMtCfQ+3PvHp3l689XZvAM9QyOA==",
+      "version": "7.9.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.9.5.tgz",
+      "integrity": "sha512-JVcQZeXM59Cd1qanDUxv9fgJpt3NeKUaqBqUEvfmQ+BCOKq2xUgaWZW2hr0dkbyJgezYuplEoh5knmrnS68efw==",
       "dev": true,
       "requires": {
         "@babel/helper-get-function-arity": "^7.8.3",
         "@babel/template": "^7.8.3",
-        "@babel/types": "^7.8.3"
+        "@babel/types": "^7.9.5"
       }
     },
     "@babel/helper-get-function-arity": {
@@ -160,15 +145,6 @@
         "@babel/types": "^7.8.3"
       }
     },
-    "@babel/helper-hoist-variables": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/helper-hoist-variables/-/helper-hoist-variables-7.8.3.tgz",
-      "integrity": "sha512-ky1JLOjcDUtSc+xkt0xhYff7Z6ILTAHKmZLHPxAhOP0Nd77O+3nCsd6uSVYur6nJnCI029CrNbYlc0LoPfAPQg==",
-      "dev": true,
-      "requires": {
-        "@babel/types": "^7.8.3"
-      }
-    },
     "@babel/helper-member-expression-to-functions": {
       "version": "7.8.3",
       "resolved": "https://registry.npmjs.org/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.8.3.tgz",
@@ -188,16 +164,17 @@
       }
     },
     "@babel/helper-module-transforms": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/helper-module-transforms/-/helper-module-transforms-7.8.3.tgz",
-      "integrity": "sha512-C7NG6B7vfBa/pwCOshpMbOYUmrYQDfCpVL/JCRu0ek8B5p8kue1+BCXpg2vOYs7w5ACB9GTOBYQ5U6NwrMg+3Q==",
+      "version": "7.9.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-module-transforms/-/helper-module-transforms-7.9.0.tgz",
+      "integrity": "sha512-0FvKyu0gpPfIQ8EkxlrAydOWROdHpBmiCiRwLkUiBGhCUPRRbVD2/tm3sFr/c/GWFrQ/ffutGUAnx7V0FzT2wA==",
       "dev": true,
       "requires": {
         "@babel/helper-module-imports": "^7.8.3",
+        "@babel/helper-replace-supers": "^7.8.6",
         "@babel/helper-simple-access": "^7.8.3",
         "@babel/helper-split-export-declaration": "^7.8.3",
-        "@babel/template": "^7.8.3",
-        "@babel/types": "^7.8.3",
+        "@babel/template": "^7.8.6",
+        "@babel/types": "^7.9.0",
         "lodash": "^4.17.13"
       }
     },
@@ -239,15 +216,15 @@
       }
     },
     "@babel/helper-replace-supers": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/helper-replace-supers/-/helper-replace-supers-7.8.3.tgz",
-      "integrity": "sha512-xOUssL6ho41U81etpLoT2RTdvdus4VfHamCuAm4AHxGr+0it5fnwoVdwUJ7GFEqCsQYzJUhcbsN9wB9apcYKFA==",
+      "version": "7.9.6",
+      "resolved": "https://registry.npmjs.org/@babel/helper-replace-supers/-/helper-replace-supers-7.9.6.tgz",
+      "integrity": "sha512-qX+chbxkbArLyCImk3bWV+jB5gTNU/rsze+JlcF6Nf8tVTigPJSI1o1oBow/9Resa1yehUO9lIipsmu9oG4RzA==",
       "dev": true,
       "requires": {
         "@babel/helper-member-expression-to-functions": "^7.8.3",
         "@babel/helper-optimise-call-expression": "^7.8.3",
-        "@babel/traverse": "^7.8.3",
-        "@babel/types": "^7.8.3"
+        "@babel/traverse": "^7.9.6",
+        "@babel/types": "^7.9.6"
       }
     },
     "@babel/helper-simple-access": {
@@ -269,6 +246,12 @@
         "@babel/types": "^7.8.3"
       }
     },
+    "@babel/helper-validator-identifier": {
+      "version": "7.9.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.9.5.tgz",
+      "integrity": "sha512-/8arLKUFq882w4tWGj9JYzRpAlZgiWUJ+dtteNTDqrRBz9Iguck9Rn3ykuBDoUwh2TO4tSAJlrxDUOXWklJe4g==",
+      "dev": true
+    },
     "@babel/helper-wrap-function": {
       "version": "7.8.3",
       "resolved": "https://registry.npmjs.org/@babel/helper-wrap-function/-/helper-wrap-function-7.8.3.tgz",
@@ -282,24 +265,24 @@
       }
     },
     "@babel/helpers": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.8.3.tgz",
-      "integrity": "sha512-LmU3q9Pah/XyZU89QvBgGt+BCsTPoQa+73RxAQh8fb8qkDyIfeQnmgs+hvzhTCKTzqOyk7JTkS3MS1S8Mq5yrQ==",
+      "version": "7.9.6",
+      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.9.6.tgz",
+      "integrity": "sha512-tI4bUbldloLcHWoRUMAj4g1bF313M/o6fBKhIsb3QnGVPwRm9JsNf/gqMkQ7zjqReABiffPV6RWj7hEglID5Iw==",
       "dev": true,
       "requires": {
         "@babel/template": "^7.8.3",
-        "@babel/traverse": "^7.8.3",
-        "@babel/types": "^7.8.3"
+        "@babel/traverse": "^7.9.6",
+        "@babel/types": "^7.9.6"
       }
     },
     "@babel/highlight": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.8.3.tgz",
-      "integrity": "sha512-PX4y5xQUvy0fnEVHrYOarRPXVWafSjTW9T0Hab8gVIawpl2Sj0ORyrygANq+KjcNlSSTw0YCLSNA8OyZ1I4yEg==",
+      "version": "7.9.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.9.0.tgz",
+      "integrity": "sha512-lJZPilxX7Op3Nv/2cvFdnlepPXDxi29wxteT57Q965oc5R9v86ztx0jfxVrTcBk8C2kcPkkDa2Z4T3ZsPPVWsQ==",
       "dev": true,
       "requires": {
+        "@babel/helper-validator-identifier": "^7.9.0",
         "chalk": "^2.0.0",
-        "esutils": "^2.0.2",
         "js-tokens": "^4.0.0"
       },
       "dependencies": {
@@ -317,9 +300,9 @@
       }
     },
     "@babel/parser": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.8.3.tgz",
-      "integrity": "sha512-/V72F4Yp/qmHaTALizEm9Gf2eQHV3QyTL3K0cNfijwnMnb1L+LDlAubb/ZnSdGAVzVSWakujHYs1I26x66sMeQ==",
+      "version": "7.9.6",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.9.6.tgz",
+      "integrity": "sha512-AoeIEJn8vt+d/6+PXDRPaksYhnlbMIiejioBZvvMQsOjW/JYK6k/0dKnvvP3EhK5GfMBWDPtrxRtegWdAcdq9Q==",
       "dev": true
     },
     "@babel/plugin-external-helpers": {
@@ -343,13 +326,14 @@
       }
     },
     "@babel/plugin-proposal-object-rest-spread": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-object-rest-spread/-/plugin-proposal-object-rest-spread-7.8.3.tgz",
-      "integrity": "sha512-8qvuPwU/xxUCt78HocNlv0mXXo0wdh9VT1R04WU8HGOfaOob26pF+9P5/lYjN/q7DHOX1bvX60hnhOvuQUJdbA==",
+      "version": "7.9.6",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-object-rest-spread/-/plugin-proposal-object-rest-spread-7.9.6.tgz",
+      "integrity": "sha512-Ga6/fhGqA9Hj+y6whNpPv8psyaK5xzrQwSPsGPloVkvmH+PqW1ixdnfJ9uIO06OjQNYol3PMnfmJ8vfZtkzF+A==",
       "dev": true,
       "requires": {
         "@babel/helper-plugin-utils": "^7.8.3",
-        "@babel/plugin-syntax-object-rest-spread": "^7.8.0"
+        "@babel/plugin-syntax-object-rest-spread": "^7.8.0",
+        "@babel/plugin-transform-parameters": "^7.9.5"
       }
     },
     "@babel/plugin-syntax-async-generators": {
@@ -428,17 +412,17 @@
       }
     },
     "@babel/plugin-transform-classes": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-classes/-/plugin-transform-classes-7.8.3.tgz",
-      "integrity": "sha512-SjT0cwFJ+7Rbr1vQsvphAHwUHvSUPmMjMU/0P59G8U2HLFqSa082JO7zkbDNWs9kH/IUqpHI6xWNesGf8haF1w==",
+      "version": "7.9.5",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-classes/-/plugin-transform-classes-7.9.5.tgz",
+      "integrity": "sha512-x2kZoIuLC//O5iA7PEvecB105o7TLzZo8ofBVhP79N+DO3jaX+KYfww9TQcfBEZD0nikNyYcGB1IKtRq36rdmg==",
       "dev": true,
       "requires": {
         "@babel/helper-annotate-as-pure": "^7.8.3",
         "@babel/helper-define-map": "^7.8.3",
-        "@babel/helper-function-name": "^7.8.3",
+        "@babel/helper-function-name": "^7.9.5",
         "@babel/helper-optimise-call-expression": "^7.8.3",
         "@babel/helper-plugin-utils": "^7.8.3",
-        "@babel/helper-replace-supers": "^7.8.3",
+        "@babel/helper-replace-supers": "^7.8.6",
         "@babel/helper-split-export-declaration": "^7.8.3",
         "globals": "^11.1.0"
       }
@@ -453,9 +437,9 @@
       }
     },
     "@babel/plugin-transform-destructuring": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-destructuring/-/plugin-transform-destructuring-7.8.3.tgz",
-      "integrity": "sha512-H4X646nCkiEcHZUZaRkhE2XVsoz0J/1x3VVujnn96pSoGCtKPA99ZZA+va+gK+92Zycd6OBKCD8tDb/731bhgQ==",
+      "version": "7.9.5",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-destructuring/-/plugin-transform-destructuring-7.9.5.tgz",
+      "integrity": "sha512-j3OEsGel8nHL/iusv/mRd5fYZ3DrOxWC82x0ogmdN/vHfAP4MYw+AFKYanzWlktNwikKvlzUV//afBW5FTp17Q==",
       "dev": true,
       "requires": {
         "@babel/helper-plugin-utils": "^7.8.3"
@@ -481,9 +465,9 @@
       }
     },
     "@babel/plugin-transform-for-of": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-for-of/-/plugin-transform-for-of-7.8.3.tgz",
-      "integrity": "sha512-ZjXznLNTxhpf4Q5q3x1NsngzGA38t9naWH8Gt+0qYZEJAcvPI9waSStSh56u19Ofjr7QmD0wUsQ8hw8s/p1VnA==",
+      "version": "7.9.0",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-for-of/-/plugin-transform-for-of-7.9.0.tgz",
+      "integrity": "sha512-lTAnWOpMwOXpyDx06N+ywmF3jNbafZEqZ96CGYabxHrxNX8l5ny7dt4bK/rGwAh9utyP2b2Hv7PlZh1AAS54FQ==",
       "dev": true,
       "requires": {
         "@babel/helper-plugin-utils": "^7.8.3"
@@ -518,14 +502,14 @@
       }
     },
     "@babel/plugin-transform-modules-amd": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-modules-amd/-/plugin-transform-modules-amd-7.8.3.tgz",
-      "integrity": "sha512-MadJiU3rLKclzT5kBH4yxdry96odTUwuqrZM+GllFI/VhxfPz+k9MshJM+MwhfkCdxxclSbSBbUGciBngR+kEQ==",
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-        "regjsgen": "^0.5.0",
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+        "regjsgen": "^0.5.1",
+        "regjsparser": "^0.6.4",
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@@ -22684,9 +22496,9 @@
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+      "resolved": "https://registry.npmjs.org/regjsparser/-/regjsparser-0.6.4.tgz",
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@@ -22913,21 +22725,18 @@
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-      "dev": true,
-      "requires": {
-        "is-promise": "^2.1.0"
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+      "version": "2.4.1",
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+      "dev": true
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@@ -23059,9 +22868,9 @@
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-      "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.3.tgz",
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@@ -23270,13 +23079,20 @@
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+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.4.18.tgz",
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-        "buffer-from": "^1.0.0",
-        "source-map": "^0.6.0"
+        "source-map": "^0.5.6"
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+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        }
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@@ -23302,9 +23118,9 @@
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-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.2.0.tgz",
-      "integrity": "sha512-2XQACfElKi9SlVb1CYadKDXvoajPgBVPn/gOQLrTvHdElaVhr7ZEbqJaRnJLVNeaI4cMEAgVCeBMKF6MWRDCRA==",
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.3.0.tgz",
+      "integrity": "sha512-/tTrYOC7PPI1nUAgx34hUpqXuyJG+DTHJTnIULG4rDygi4xu/tfgmq1e1cIRwRzwZgo4NLySi+ricLkZkw4i5A==",
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@@ -23437,26 +23253,6 @@
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-    "string.prototype.trimright": {
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-      "resolved": "https://registry.npmjs.org/string.prototype.trimright/-/string.prototype.trimright-2.1.1.tgz",
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@@ -24001,15 +23797,15 @@
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     "unicode-match-property-value-ecmascript": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/unicode-match-property-value-ecmascript/-/unicode-match-property-value-ecmascript-1.1.0.tgz",
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+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/unicode-match-property-value-ecmascript/-/unicode-match-property-value-ecmascript-1.2.0.tgz",
+      "integrity": "sha512-wjuQHGQVofmSJv1uVISKLE5zO2rNGzM/KCYZch/QQvez7C1hUhBIuZ701fYXExuufJFMPhv2SyL8CyoIfMLbIQ==",
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     },
     "unicode-property-aliases-ecmascript": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/unicode-property-aliases-ecmascript/-/unicode-property-aliases-ecmascript-1.0.5.tgz",
-      "integrity": "sha512-L5RAqCfXqAwR3RriF8pM0lU0w4Ryf/GgzONwi6KnL1taJQa7x1TCxdJnILX59WIGOwR57IVxn7Nej0fz1Ny6fw==",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/unicode-property-aliases-ecmascript/-/unicode-property-aliases-ecmascript-1.1.0.tgz",
+      "integrity": "sha512-PqSoPh/pWetQ2phoj5RLiaqIk4kCNwoV3CI+LfGmWLKI3rE3kl1h59XpX2BjgDrmbxD9ARtQobPGU1SguCYuQg==",
       "dev": true
     },
     "union-value": {
@@ -24166,15 +23962,14 @@
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-      "resolved": "https://registry.npmjs.org/util/-/util-0.12.1.tgz",
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+      "version": "0.12.2",
+      "resolved": "https://registry.npmjs.org/util/-/util-0.12.2.tgz",
+      "integrity": "sha512-XE+MkWQvglYa+IOfBt5UFG93EmncEMP23UqpgDvVZVFBPxwmkK10QRp6pgU4xICPnWRf/t0zPv4noYSUq9gqUQ==",
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diff --git a/package.json b/package.json
index 8a7e850a65..31d3427976 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,6 @@
   },
   "devDependencies": {
     "@polymer/gen-closure-declarations": "^0.5.0",
-    "@polymer/gen-typescript-declarations": "^1.5.1",
     "@polymer/iron-component-page": "^3.0.0-pre.12",
     "@polymer/test-fixture": "^3.0.0-pre.12",
     "@webcomponents/webcomponentsjs": "^2.2.10",
@@ -42,7 +41,7 @@
     "test": "npm run lint && polymer test --npm --module-resolution=node",
     "serve": "polymer serve --npm --module-resolution=node",
     "lint": "gulp lint",
-    "generate-types": "gen-typescript-declarations --outDir . --deleteExisting --verify && gulp generate-externs",
+    "generate-types": "gulp generate-externs",
     "regen-package-lock": "rm -rf node_modules package-lock.json; npm install",
     "prepare": "npm run generate-types"
   },