Fix tsconfig types and added some fs tests

src/fs/is-dir.ts

@@ -0,0 +1,17 @@
+import { statSync } from 'node:fs';
+
+/**
+ * Determines if a directory exists and that it is indeed a directory.
+ *
+ * @param dir - The directory to check
+ * @returns `true` if the directory exists and is a directory, otherwise
+ * `false`
+ */
+export function isDir(dir: string) {
+	try {
+		return statSync(dir).isDirectory();
+	} catch (e) {
+		// squelch
+	}
+	return false;
+}

src/fs/is-file.ts

@@ -0,0 +1,14 @@
+import { statSync } from 'node:fs';
+
+/**
+ * Determines if a file exists and that it is indeed a file.
+ *
+ * @param file - The file to check
+ * @returns `true` if the file exists and is a file, otherwise `false`
+ */
+export function isFile(file: string) {
+	try {
+		return statSync(file).isFile();
+	} catch {}
+	return false;
+}

test/fs/is-dir.test.ts

@@ -0,0 +1,23 @@
+import { describe, expect, it } from 'vitest';
+import { isDir } from '../../src/fs/is-dir.js';
+import { dirname, join } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+describe('fs', () => {
+	describe('isDir()', () => {
+		it('should succeed if a directory exists', () => {
+			const thisDir = dirname(fileURLToPath(import.meta.url));
+			expect(isDir(thisDir)).to.be.true;
+		});
+
+		it('should fail if a directory does not exist', () => {
+			const thisDir = dirname(fileURLToPath(import.meta.url));
+			expect(isDir(join(thisDir, 'doesnotexist'))).to.be.false;
+		});
+
+		it('should fail if a directory is a file', () => {
+			const thisFile = fileURLToPath(import.meta.url);
+			expect(isDir(thisFile)).to.be.false;
+		});
+	});
+});

test/fs/is-file.test.ts

@@ -0,0 +1,23 @@
+import { describe, expect, it } from 'vitest';
+import { isFile } from '../../src/fs/is-file.js';
+import { dirname, join } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+describe('fs', () => {
+	describe('isFile()', () => {
+		it('should succeed if a file exists', () => {
+			const thisFile = fileURLToPath(import.meta.url);
+			expect(isFile(thisFile)).to.be.true;
+		});
+
+		it('should fail if a file does not exist', () => {
+			const thisDir = dirname(fileURLToPath(import.meta.url));
+			expect(isFile(join(thisDir, 'doesnotexist'))).to.be.false;
+		});
+
+		it('should fail if a file is a directory', () => {
+			const thisDir = dirname(fileURLToPath(import.meta.url));
+			expect(isFile(thisDir)).to.be.false;
+		});
+	});
+});

tsconfig.base.json

@@ -19,6 +19,8 @@
     "skipLibCheck": true,
     "strict": true,
     "sourceMap": true,
-    "target": "esnext"
+    "target": "esnext",
+    "typeRoots": ["./node_modules/@types"],
+    "types": ["node"]
   }
 }

tsconfig.json

@@ -7,5 +7,9 @@
     "esModuleInterop": true,
     "sourceMap": false
   },
-  "include": ["./rollup.config.ts", "./rollup.dts.config.ts"]
+  "include": [
+    "./rollup.config.ts",
+    "./rollup.dts.config.ts",
+    "./src/**/*.ts",
+  ]
 }