[meta] use prepublishOnly script for npm 7+

Author: ljharb

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

@@ -8,7 +8,8 @@
     "lint": "eslint --report-unused-disable-directives .",
     "pretests-only": "node ./test/requires",
     "tests-only": "babel-tape-runner ./test/test-*.js",
-    "prepublish": "(in-install || eslint-find-rules --unused) && (not-in-publish || npm test) && safe-publish-latest",
+    "prepublishOnly": "eslint-find-rules --unused && npm test && safe-publish-latest",
+    "prepublish": "not-in-publish || npm run prepublishOnly",
     "pretest": "npm run --silent lint",
     "test": "npm run --silent tests-only",
     "pretravis": ":",

packages/eslint-config-airbnb/package.json

@@ -8,7 +8,8 @@
     "lint": "eslint .",
     "pretests-only": "node ./test/requires",
     "tests-only": "babel-tape-runner ./test/test-*.js",
-    "prepublish": "(in-install || eslint-find-rules --unused) && (not-in-publish || npm test) && safe-publish-latest",
+    "prepublishOnly": "eslint-find-rules --unused && npm test && safe-publish-latest",
+    "prepublish": "not-in-publish || npm run prepublishOnly",
     "pretest": "npm run --silent lint",
     "test": "npm run --silent tests-only",
     "link:eslint": "cd node_modules/eslint && npm link --production && cd -",