upgrade to typescript `3.9.10`

package-lock.json

@@ -5,6 +5,7 @@
   "requires": true,
   "packages": {
     "": {
+      "name": "svelte",
       "version": "3.46.4",
       "license": "MIT",
       "devDependencies": {
@@ -43,7 +44,7 @@
         "sourcemap-codec": "^1.4.8",
         "tiny-glob": "^0.2.6",
         "tslib": "^2.0.3",
-        "typescript": "^3.7.5"
+        "typescript": "^3.9.10"
       },
       "engines": {
         "node": ">= 8"
@@ -4870,9 +4871,9 @@
       "dev": true
     },
     "node_modules/typescript": {
-      "version": "3.7.5",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.7.5.tgz",
-      "integrity": "sha512-/P5lkRXkWHNAbcJIiHPfRoKqyd7bsyCma1hZNUGfn20qm64T6ZBlrzprymeu918H+mB/0rIg2gGK/BXkhhYgBw==",
+      "version": "3.9.10",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.10.tgz",
+      "integrity": "sha512-w6fIxVE/H1PkLKcCPsFqKE7Kv7QUwhU8qQY2MueZXWx5cPZdwFupLgKK3vntcK98BtNHZtAF4LA/yl2a7k8R6Q==",
       "dev": true,
       "bin": {
         "tsc": "bin/tsc",
@@ -8980,9 +8981,9 @@
       "dev": true
     },
     "typescript": {
-      "version": "3.7.5",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.7.5.tgz",
-      "integrity": "sha512-/P5lkRXkWHNAbcJIiHPfRoKqyd7bsyCma1hZNUGfn20qm64T6ZBlrzprymeu918H+mB/0rIg2gGK/BXkhhYgBw==",
+      "version": "3.9.10",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.10.tgz",
+      "integrity": "sha512-w6fIxVE/H1PkLKcCPsFqKE7Kv7QUwhU8qQY2MueZXWx5cPZdwFupLgKK3vntcK98BtNHZtAF4LA/yl2a7k8R6Q==",
       "dev": true
     },
     "unbox-primitive": {

package.json

@@ -148,7 +148,7 @@
     "sourcemap-codec": "^1.4.8",
     "tiny-glob": "^0.2.6",
     "tslib": "^2.0.3",
-    "typescript": "^3.7.5"
+    "typescript": "^3.9.10"
   },
   "nyc": {
     "include": [