Adds build-types to watch script (#83)

This PR adds the `build-types` script to the `watch` script, since
`tasks/clean` is currently deleting the types files without
re-generating them.

It also moves the `build-types` script to come before
`tasks/buildsources` in the `build` script, purely for consistency with
the `watch` script.

package.json

@@ -18,9 +18,9 @@
     "lint": "eslint polyfills lib tasks test && tsc --noEmit",
     "lint-config": "node tasks/lint-config/index.js",
     "clean": "node tasks/clean",
-    "build": "npm run clean && node tasks/updatesources && node tasks/buildsources/buildsources && npm run build-types",
+    "build": "npm run clean && node tasks/updatesources && npm run build-types && node tasks/buildsources/buildsources",
     "build-types": "tsc lib/*.js --declaration --allowJs --emitDeclarationOnly --outDir lib",
-    "watch": "npm run clean && node tasks/updatesources && node tasks/buildsources/watchsource",
+    "watch": "npm run clean && node tasks/updatesources && npm run build-types && node tasks/buildsources/watchsource",
     "fmt": "eslint . --fix",
     "test-end-to-end": "node --test 'test/end-to-end/**/*.test.js'",
     "test-node": "node --test 'test/node/**/*.test.js'",