[Refactor] use pacote instead of shelling out to npm

 - remove `versions`/`messages` helpers

index.js

@@ -2,12 +2,11 @@
 
 const every = require('array.prototype.every');
 const fromEntries = require('object.fromentries');
+const entries = require('object.entries');
+const pacote = require('pacote');
 
 const isString = (str) => typeof str === 'string';
 
-const getVersions = require('./versions');
-const getDeprecationMessages = require('./messages');
-
 const { from } = Array;
 
 module.exports = function deprecations(packageName, ...morePackageNames) {
@@ -20,10 +19,13 @@ module.exports = function deprecations(packageName, ...morePackageNames) {
 	}
 
 	return Promise.all(from(arguments, async (name) => {
-		const versions = await getVersions(name);
+		const { versions } = await pacote.packument(name, { fullMetadata: true });
 		return [
 			name,
-			await getDeprecationMessages(name, versions),
+			fromEntries(entries(versions).map(([version, { deprecated }]) => [
+				version,
+				deprecated,
+			])),
 		];
 	})).then(fromEntries);
 };

package.json

@@ -38,7 +38,9 @@
 	],
 	"dependencies": {
 		"array.prototype.every": "^1.1.5",
+		"object.entries": "^1.1.7",
 		"object.fromentries": "^2.0.7",
+		"pacote": "^17.0.6",
 		"string.prototype.trim": "^1.2.8"
 	},
 	"devDependencies": {
@@ -52,7 +54,6 @@
 		"tape": "^5.7.3"
 	},
 	"engines": {
-		"npm": ">= 10",
 		"node": "^18.17.0 || >=20.5.0"
 	},
 	"publishConfig": {

test/index.js

@@ -1,8 +1,5 @@
 'use strict';
 
-require('./messages');
-require('./versions');
-
 const deprecations = require('../');
 const test = require('tape');