[New] add pattern-trailers detection

 - nodejs/node#39635
 - nodejs/node#39888

README.md

@@ -17,6 +17,8 @@ Require or import `has-package-exports/conditional` to determine if the current
 
 Require or import `has-package-exports/pattern` to determine if the current environment supports exports patterns (as of this writing, node v12.20+ and v14.13+).
 
+Require or import `has-package-exports/pattern-trailers` to determine if the current environment supports exports pattern trailers (as of this writing, node v14.19+ and v16.9+).
+
 ## Tests
 Simply clone the repo, `npm install`, and run `npm test`
 

package.json

@@ -25,7 +25,8 @@
 			},
 			"./no.js"
 		],
-		"./pattern": "./pattern.js"
+		"./pattern": "./pattern.js",
+		"./pattern-trailers": "./pattern-trailers.js"
 	},
 	"scripts": {
 		"prepublish": "!(type safe-publish-latest 2>&1 >/dev/null) || not-in-publish || npm run prepublishOnly",
@@ -58,7 +59,7 @@
 	},
 	"homepage": "https://github.com/inspect-js/has-package-exports#readme",
 	"dependencies": {
-		"@ljharb/has-package-exports-patterns": "0.0.1"
+		"@ljharb/has-package-exports-patterns": "^0.0.2"
 	},
 	"devDependencies": {
 		"@ljharb/eslint-config": "^20.2.3",

pattern-trailers.js

@@ -0,0 +1,11 @@
+'use strict';
+
+var supported;
+try {
+	/* eslint global-require: 0 */
+	supported = require('@ljharb/has-package-exports-patterns/pattern-trailers/pattern')
+		&& require('@ljharb/has-package-exports-patterns/pattern-trailers/pattern.js');
+} catch (e) {
+	supported = false;
+}
+module.exports = supported;

test/index.js

@@ -5,6 +5,7 @@ var semver = require('semver');
 var hasPackageExports = require('has-package-exports');
 var hasConditionalPackageExports = require('has-package-exports/conditional');
 var hasPackageExportPatterns = require('has-package-exports/pattern');
+var hasPackageExportPatternTrailers = require('has-package-exports/pattern-trailers');
 // eslint-disable-next-line global-require
 var spawnSync = typeof window === 'undefined' && require('child_process').spawnSync;
 
@@ -31,5 +32,8 @@ test('has-package-exports', function (t) {
 	var expectedPattern = typeof window === 'undefined' ? semver.satisfies(process.version, '^12.20.0 || >= 14.13') : null;
 	t.equal(hasPackageExportPatterns, expectedPattern, './pattern entrypoint exports expected value: ' + expectedPattern);
 
+	var expectedPatternTrailers = typeof window === 'undefined' ? semver.satisfies(process.version, '^14.19 || >= 16.9') : null;
+	t.equal(hasPackageExportPatternTrailers, expectedPatternTrailers, './pattern-trailers entrypoint exports expected value: ' + expectedPatternTrailers);
+
 	t.end();
 });