[eslint config] [*] improve prepublish script

Author: ljharb

packages/eslint-config-airbnb-base/package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "lint": "eslint .",
     "tests-only": "babel-tape-runner ./test/test-*.js",
-    "prepublish": "not-in-publish || (eslint-find-rules --unused && npm test)",
+    "prepublish": "(in-install || eslint-find-rules --unused) && (not-in-publish || npm test)",
     "pretest": "npm run --silent lint",
     "test": "npm run --silent tests-only",
     "travis": "npm run --silent test"

packages/eslint-config-airbnb/package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "lint": "eslint .",
     "tests-only": "babel-tape-runner ./test/test-*.js",
-    "prepublish": "not-in-publish || (eslint-find-rules --unused && npm test)",
+    "prepublish": "(in-install || eslint-find-rules --unused) && (not-in-publish || npm test)",
     "pretest": "npm run --silent lint",
     "test": "npm run --silent tests-only",
     "travis": "cd ../eslint-config-airbnb-base && npm install && npm link && cd - && npm link eslint-config-airbnb-base && npm run --silent test ; npm unlink eslint-config-airbnb-base >/dev/null &"