test(fs): replace jest with vitest

libs/fs/.eslintignore

@@ -1,3 +1,3 @@
 build
 coverage
-jest.config.js
+vitest.config.ts

libs/fs/package.json

@@ -18,9 +18,9 @@
     "lint:fix": "pnpm type-check && eslint . --fix",
     "pre-commit": "lint-staged",
     "test": "is-ci test:ci test:watch",
-    "test:ci": "pnpm build && pnpm test:coverage --reporters=default --reporters=jest-junit --maxWorkers=6",
-    "test:coverage": "jest --coverage",
-    "test:watch": "jest --watch",
+    "test:ci": "pnpm build && vitest run --coverage",
+    "test:coverage": "vitest --coverage",
+    "test:watch": "vitest",
     "type-check": "tsc --build"
   },
   "dependencies": {
@@ -35,22 +35,19 @@
   },
   "devDependencies": {
     "@types/debug": "4.1.8",
-    "@types/jest": "^29.5.3",
     "@types/node": "20.16.0",
     "@types/tmp": "0.2.4",
+    "@vitest/coverage-istanbul": "^2.1.8",
     "@votingworks/fixtures": "workspace:*",
     "@votingworks/test-utils": "workspace:*",
     "eslint-plugin-vx": "workspace:*",
     "fast-check": "2.23.2",
     "is-ci-cli": "2.2.0",
-    "jest": "^29.6.2",
-    "jest-junit": "^16.0.0",
-    "jest-watch-typeahead": "^2.2.2",
     "lint-staged": "11.0.0",
     "memory-streams": "^0.1.3",
     "sort-package-json": "^1.50.0",
     "tmp": "^0.2.1",
-    "ts-jest": "29.1.1"
+    "vitest": "^2.1.8"
   },
   "packageManager": "[email protected]"
 }

libs/fs/src/election.test.ts

@@ -1,3 +1,4 @@
+import { expect, test } from 'vitest';
 import { err, ok, typedAs } from '@votingworks/basics';
 import { electionFamousNames2021Fixtures } from '@votingworks/fixtures';
 import { writeFileSync } from 'node:fs';

libs/fs/src/index.ts

@@ -1,4 +1,4 @@
-/* istanbul ignore file */
+/* istanbul ignore file - @preserve */
 export * from './election';
 export * from './list_directory';
 export * from './open_file';

libs/fs/src/list_directory.test.ts

@@ -1,3 +1,4 @@
+import { describe, expect, test } from 'vitest';
 import { err, iter, ok } from '@votingworks/basics';
 import { symlinkSync } from 'node:fs';
 import tmp from 'tmp';

libs/fs/src/list_directory.ts

@@ -32,7 +32,7 @@ export interface FileSystemEntry {
 /**
  * Finds the {@link FileSystemEntryType} of a directory entity.
  */
-/* istanbul ignore next */
+/* istanbul ignore next - @preserve */
 function getDirentType(dirent: Dirent): FileSystemEntryType {
   if (dirent.isFile()) return FileSystemEntryType.File;
   if (dirent.isDirectory()) return FileSystemEntryType.Directory;
@@ -84,7 +84,7 @@ export async function* listDirectory(
     }
   } catch (e) {
     const error = e as { code: string };
-    /* istanbul ignore next */
+    /* istanbul ignore next - @preserve */
     switch (error.code) {
       case 'ENOENT':
         yield err({

libs/fs/src/open_file.test.ts

@@ -1,3 +1,4 @@
+import { expect, test } from 'vitest';
 import { err } from '@votingworks/basics';
 import { makeTmpFile } from '../test/utils';
 import { open } from './open_file';

libs/fs/src/read_file.test.ts

@@ -1,3 +1,4 @@
+import { expect, test } from 'vitest';
 import { Buffer } from 'node:buffer';
 import { writeFileSync } from 'node:fs';
 import { err, ok, typedAs } from '@votingworks/basics';

libs/fs/src/read_file.ts

@@ -68,7 +68,7 @@ export async function readFile(
   const buffer = Buffer.allocUnsafe(stat.size);
   const readResult = await fd.read(buffer, 0, stat.size, 0);
 
-  /* istanbul ignore next */
+  /* istanbul ignore next - @preserve */
   if (readResult.bytesRead !== stat.size) {
     await fd.close();
     return err({

libs/fs/test/utils.ts

@@ -1,3 +1,4 @@
+import { afterEach } from 'vitest';
 import { unlinkSync } from 'node:fs';
 import { tmpNameSync } from 'tmp';
 

libs/fs/vitest.config.ts

@@ -0,0 +1,3 @@
+import { defineConfig } from '../../vitest.config.shared.mjs';
+
+export default defineConfig();