Resolve import.meta.{filename,dirname} in files imported from config (#5520)

Use correct import.meta.{filename,dirname} in relative imports from transpiled config files

Author: BPScott

cli/run/loadConfigFile.ts

@@ -118,8 +118,14 @@ async function loadTranspiledConfigFile(
 					if (property === 'url') {
 						return `'${pathToFileURL(moduleId).href}'`;
 					}
+					if (property == 'filename') {
+						return `'${moduleId}'`;
+					}
+					if (property == 'dirname') {
+						return `'${path.dirname(moduleId)}'`;
+					}
 					if (property == null) {
-						return `{url:'${pathToFileURL(moduleId).href}'}`;
+						return `{url:'${pathToFileURL(moduleId).href}', filename: '${moduleId}', dirname: '${path.dirname(moduleId)}'}`;
 					}
 				}
 			}

test/cli/samples/config-import-meta/_config.js

@@ -1,4 +1,4 @@
 module.exports = defineTest({
-	description: 'uses correct import.meta.url in config files',
+	description: 'uses correct import.meta.{url,filename,dirname} in config files',
 	command: 'rollup -c --bundleConfigAsCjs'
 });

test/cli/samples/config-import-meta/plugin/plugin.js

@@ -9,6 +9,8 @@ const fileName = `test.txt`;
 
 function validateImportMeta(importMeta) {
 	assert.strictEqual(importMeta.url, import.meta.url);
+	assert.strictEqual(importMeta.filename, import.meta.filename);
+	assert.strictEqual(importMeta.dirname, import.meta.dirname);
 }
 
 validateImportMeta(import.meta);