add extended types for "node:test"

Author: progfay

tsconfig.json

@@ -31,7 +31,9 @@
 		// "baseUrl": "./",                                  /* Specify the base directory to resolve non-relative module names. */
 		// "paths": {},                                      /* Specify a set of entries that re-map imports to additional lookup locations. */
 		// "rootDirs": [],                                   /* Allow multiple folders to be treated as one when resolving modules. */
-		// "typeRoots": [],                                  /* Specify multiple folders that act like './node_modules/@types'. */
+		"typeRoots": [
+			"./types"
+		] /* Specify multiple folders that act like './node_modules/@types'. */,
 		// "types": [],                                      /* Specify type package names to be included without being referenced in a source file. */
 		// "allowUmdGlobalAccess": true,                     /* Allow accessing UMD globals from modules. */
 		// "moduleSuffixes": [],                             /* List of file name suffixes to search when resolving a module. */

types/node-test.d.ts

@@ -0,0 +1,20 @@
+import "node:test";
+
+declare module "node:test" {
+	interface TestContext {
+		readonly assert: {
+			equal(actual: unknown, expected: unknown, message?: string | Error): void;
+			strictEqual(
+				actual: unknown,
+				expected: unknown,
+				message?: string | Error,
+			): void;
+			deepStrictEqual(
+				actual: unknown,
+				expected: unknown,
+				message?: string | Error,
+			): void;
+			snapshot(v: unknown): void;
+		};
+	}
+}