Add `@types/jest` npm package as a dev dependency

In vscode, and I assume in other IDEs, adding `@types/jest` enables both
intellisense and documentation for jest test files (`*_spec.js).

package.json

@@ -204,6 +204,7 @@
     "@gitlab/stylelint-config": "4.0.0",
     "@graphql-eslint/eslint-plugin": "3.0.0",
     "@testing-library/dom": "^7.16.2",
+    "@types/jest": "^26.0.24",
     "@vue/test-utils": "1.3.0",
     "acorn": "^6.3.0",
     "axios-mock-adapter": "^1.15.0",

yarn.lock

@@ -1379,6 +1379,17 @@
     "@types/yargs" "^15.0.0"
     chalk "^4.0.0"
 
+"@jest/types@^26.6.2":
+  version "26.6.2"
+  resolved "https://registry.yarnpkg.com/@jest/types/-/types-26.6.2.tgz#bef5a532030e1d88a2f5a6d933f84e97226ed48e"
+  integrity sha512-fC6QCp7Sc5sX6g8Tvbmj4XUTbyrik0akgRy03yjXbQaBWWNWGE7SGtJk98m0N8nzegD/7SggrUlivxo5ax4KWQ==
+  dependencies:
+    "@types/istanbul-lib-coverage" "^2.0.0"
+    "@types/istanbul-reports" "^3.0.0"
+    "@types/node" "*"
+    "@types/yargs" "^15.0.0"
+    chalk "^4.0.0"
+
 "@miragejs/pretender-node-polyfill@^0.1.0":
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/@miragejs/pretender-node-polyfill/-/pretender-node-polyfill-0.1.2.tgz#d26b6b7483fb70cd62189d05c95d2f67153e43f2"
@@ -1929,6 +1940,14 @@
   dependencies:
     "@types/istanbul-lib-report" "*"
 
+"@types/jest@^26.0.24":
+  version "26.0.24"
+  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-26.0.24.tgz#943d11976b16739185913a1936e0de0c4a7d595a"
+  integrity sha512-E/X5Vib8BWqZNRlDxj9vYXhsDwPYbPINqKF9BsnSoon4RQ0D9moEuLD8txgyypFLH7J4+Lho9Nr/c8H0Fi+17w==
+  dependencies:
+    jest-diff "^26.0.0"
+    pretty-format "^26.0.0"
+
 "@types/json-schema@^7.0.3", "@types/json-schema@^7.0.5", "@types/json-schema@^7.0.8", "@types/json-schema@^7.0.9":
   version "7.0.9"
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.9.tgz#97edc9037ea0c38585320b28964dde3b39e4660d"
@@ -4841,6 +4860,11 @@ diff-sequences@^26.5.0:
   resolved "https://registry.yarnpkg.com/diff-sequences/-/diff-sequences-26.5.0.tgz#ef766cf09d43ed40406611f11c6d8d9dd8b2fefd"
   integrity sha512-ZXx86srb/iYy6jG71k++wBN9P9J05UNQ5hQHQd9MtMPvcqXPx/vKU69jfHV637D00Q2gSgPk2D+jSx3l1lDW/Q==
 
+diff-sequences@^26.6.2:
+  version "26.6.2"
+  resolved "https://registry.yarnpkg.com/diff-sequences/-/diff-sequences-26.6.2.tgz#48ba99157de1923412eed41db6b6d4aa9ca7c0b1"
+  integrity sha512-Mv/TDa3nZ9sbc5soK+OoA74BsS3mL37yixCvUAQkiuA4Wz6YtwP/K47n2rv2ovzHZvoiQeA5FTQOschKkEwB0Q==
+
 diff-sequences@^27.4.0:
   version "27.4.0"
   resolved "https://registry.yarnpkg.com/diff-sequences/-/diff-sequences-27.4.0.tgz#d783920ad8d06ec718a060d00196dfef25b132a5"
@@ -7201,6 +7225,16 @@ jest-config@^26.5.2:
     micromatch "^4.0.2"
     pretty-format "^26.5.2"
 
+jest-diff@^26.0.0:
+  version "26.6.2"
+  resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-26.6.2.tgz#1aa7468b52c3a68d7d5c5fdcdfcd5e49bd164394"
+  integrity sha512-6m+9Z3Gv9wN0WFVasqjCL/06+EFCMTqDEUl/b87HYK2rAPTyfz4ZIuSlPhY51PIQRWx5TaxeF1qmXKe9gfN3sA==
+  dependencies:
+    chalk "^4.0.0"
+    diff-sequences "^26.6.2"
+    jest-get-type "^26.3.0"
+    pretty-format "^26.6.2"
+
 jest-diff@^26.5.2:
   version "26.5.2"
   resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-26.5.2.tgz#8e26cb32dc598e8b8a1b9deff55316f8313c8053"
@@ -9530,6 +9564,16 @@ prettier@^1.18.2:
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.18.2.tgz#6823e7c5900017b4bd3acf46fe9ac4b4d7bda9ea"
   integrity sha512-OeHeMc0JhFE9idD4ZdtNibzY0+TPHSpSSb9h8FqtP+YnoZZ1sl8Vc9b1sasjfymH3SonAF4QcA2+mzHPhMvIiw==
 
+pretty-format@^26.0.0, pretty-format@^26.6.2:
+  version "26.6.2"
+  resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-26.6.2.tgz#e35c2705f14cb7fe2fe94fa078345b444120fc93"
+  integrity sha512-7AeGuCYNGmycyQbCqd/3PWH4eOoX/OiCa0uphp57NVTeAGdJGaAliecxwBDHYQCIvrW7aDBZCYeNTP/WX69mkg==
+  dependencies:
+    "@jest/types" "^26.6.2"
+    ansi-regex "^5.0.0"
+    ansi-styles "^4.0.0"
+    react-is "^17.0.1"
+
 pretty-format@^26.4.2, pretty-format@^26.5.2:
   version "26.5.2"
   resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-26.5.2.tgz#5d896acfdaa09210683d34b6dc0e6e21423cd3e1"