Combine code checking scripts into npm run lint

Author: 1j01

README.md

@@ -342,11 +342,7 @@ Install [Node.js][] if you don't have it, then open up a command prompt / termin
 
 ### Testing
 
-Run `npm run lint` to check for code problems.
-
-Run `npm run spellcheck` to check for spelling errors. This may be included in the linting script in the future.
-
-Run `npm run typecheck` to check for type errors. This may be included in the linting script in the future. Not much of the codebase is typechecked yet.
+Run `npm run lint` to check for spelling errors, type errors, code style issues, and other problems.
 
 Run `npm test` to run browser-based tests with Cypress. (It's slow to start up and run tests, unfortunately.)
 

package.json

@@ -117,9 +117,10 @@
     "electron:package": "electron-forge package",
     "electron:make": "electron-forge make",
     "electron:publish": "electron-forge publish",
-    "typecheck": "tsc --noEmit -p jsconfig.json",
-    "spellcheck": "cspell-cli lint .",
-    "lint": "eslint",
+    "lint-cspell": "cspell-cli lint .",
+    "lint-tsc": "tsc --noEmit --project jsconfig.json",
+    "lint-eslint": "eslint",
+    "lint": "npm-run-all --continue-on-error --serial lint-*",
     "build-css": "rtlcss styles/layout.css styles/layout.rtl.css && rtlcss lib/os-gui/build/layout.css lib/os-gui/build/layout.rtl.css && rtlcss lib/98.css/98.custom-build.css lib/98.css/98.custom-build.rtl.css",
     "watch-css": "onchange --initial --poll 100 \"styles/layout.css\" \"lib/os-gui/build/layout.css\" \"lib/98.css/98.custom-build.css\" -- npm run build-css",
     "update-localization": "node ./localization/preprocess.js",