[meta] add npmignore and safe-publish-latest

Author: ljharb

.gitignore

@@ -4,3 +4,5 @@ node_modules
 npm-shrinkwrap.json
 package-lock.json
 yarn.lock
+
+.npmignore

package.json

@@ -4,6 +4,9 @@
 "description": "abstract base class for crypto-streams",
 "main": "index.js",
 "scripts": {
+"prepack": "npmignore --auto --commentLines=autogenerated",
+"prepublishOnly": "safe-publish-latest",
+"prepublish": "not-in-publish || npm run prepublishOnly",
 "lint": "eslint --ext=js,.mjs .",
 "pretest": "npm run lint",
 "test": "npm run tests-only",
@@ -31,8 +34,16 @@
 "devDependencies": {
 "@ljharb/eslint-config": "^21.1.1",
 "eslint": "=8.8.0",
+"in-publish": "^2.0.1",
+"npmignore": "^0.3.1",
+"safe-publish-latest": "^2.0.0",
 "tape": "^5.9.0"
 },
+"publishConfig": {
+"ignore": [
+".github/workflows"
+]
+},
 "engines": {
 "node": ">= 0.10"
 }