Add @types/jest for editor completion

npm-shrinkwrap.json

@@ -546,6 +546,21 @@
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       "dev": true
     },
+    "@types/jest": {
+      "version": "24.0.11",
+      "resolved": "https://registry.npmjs.org/@types/jest/-/jest-24.0.11.tgz",
+      "integrity": "sha512-2kLuPC5FDnWIDvaJBzsGTBQaBbnDweznicvK7UGYzlIJP4RJR2a4A/ByLUXEyEgag6jz8eHdlWExGDtH3EYUXQ==",
+      "dev": true,
+      "requires": {
+        "@types/jest-diff": "*"
+      }
+    },
+    "@types/jest-diff": {
+      "version": "20.0.1",
+      "resolved": "https://registry.npmjs.org/@types/jest-diff/-/jest-diff-20.0.1.tgz",
+      "integrity": "sha512-yALhelO3i0hqZwhjtcr6dYyaLoCHbAMshwtj6cGxTvHZAKXHsYGdff6E8EPw3xLKY0ELUTQ69Q1rQiJENnccMA==",
+      "dev": true
+    },
     "@types/node": {
       "version": "11.11.0",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-11.11.0.tgz",

package.json

@@ -49,6 +49,7 @@
     "zive": "*"
   },
   "devDependencies": {
+    "@types/jest": "^24.0.11",
     "eslint": "*",
     "eslint-config-google": "*",
     "eslint-plugin-jest": "^22.3.0",