[meta] add npmignore

Author: ljharb

.gitignore

@@ -64,3 +64,5 @@ typings/
 npm-shrinkwrap.json
 package-lock.json
 yarn.lock
+
+.npmignore

.npmignore

@@ -5,8 +5,7 @@
 	"main": "index.js",
 	"sideEffects": false,
 	"scripts": {
-		"version": "auto-changelog && git add CHANGELOG.md",
-		"postversion": "auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f \"v$(node -e \"console.log(require('./package.json').version)\")\"",
+		"prepack": "npmignore --auto --commentLines=autogenerated",
 		"prepublishOnly": "safe-publish-latest",
 		"prepublish": "not-in-publish || npm run prepublishOnly",
 		"pretest": "npm run lint",
@@ -16,7 +15,9 @@
 		"tests:shims": "nyc tape --require=es5-shim --require=es5-shim 'test/**/*.js'",
 		"tests:corejs": "nyc tape --require=core-js 'test/**/*.js'",
 		"test": "npm run tests-only && npm run tests:shims && npm run tests:corejs",
-		"posttest": "npx npm@\">= 10.2\" audit --production"
+		"posttest": "npx npm@\">= 10.2\" audit --production",
+		"version": "auto-changelog && git add CHANGELOG.md",
+		"postversion": "auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f \"v$(node -e \"console.log(require('./package.json').version)\")\""
 	},
 	"repository": {
 		"type": "git",
@@ -54,13 +55,17 @@
 		"eslint": "=8.8.0",
 		"for-each": "^0.3.3",
 		"in-publish": "^2.0.1",
+		"npmignore": "^0.3.1",
 		"nyc": "^10.3.2",
 		"object-inspect": "^1.13.3",
 		"safe-publish-latest": "^2.0.0",
 		"safeset": "^1.0.1",
 		"tape": "^5.9.0",
 		"typescript": "next"
 	},
+	"engines": {
+		"node": ">= 0.4"
+	},
 	"auto-changelog": {
 		"output": "CHANGELOG.md",
 		"template": "keepachangelog",
@@ -69,7 +74,12 @@
 		"backfillLimit": false,
 		"hideCredit": true
 	},
-	"engines": {
-		"node": ">= 0.4"
+	"publishConfig": {
+		"ignore": [
+			".github/workflows"
+		]
+	},
+	"testling": {
+		"files": "test/index.js"
 	}
 }