switch source to ESM, migrate off Jest to UVU, drop Node 16

.eslintrc.json

@@ -7,7 +7,6 @@
   "plugins": ["jest", "prettier"],
   "extends": [
     "eslint:recommended",
-    "plugin:jest/recommended",
     "plugin:prettier/recommended"
   ],
   "parserOptions": {

.github/workflows/main.yml

@@ -8,7 +8,7 @@ jobs:
       pull-requests: write
     steps:
       - name: '🚚 Checkout'
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: '🔏 Yarn Lock Changes'
         uses: ./
         with:

.github/workflows/tests.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [16, 18, 20]
+        node: [18, 20, 21]
     name: Testing on Node ${{ matrix.node }}
     steps:
     - name: '🚚 Checkout'

package.json

@@ -9,7 +9,7 @@
     "build": "ncc build ./src/action.js -m --target es2021",
     "lint": "eslint .",
     "optimize": "svgo -f ./assets",
-    "test": "jest"
+    "test": "uvu tests -i .cjs -i testUtils"
   },
   "dependencies": {
     "@actions/core": "^1.10.1",
@@ -19,17 +19,14 @@
     "semver": "^7.5.4"
   },
   "devDependencies": {
-    "@babel/core": "^7.23.7",
-    "@babel/preset-env": "^7.23.8",
     "@vercel/ncc": "^0.38.1",
     "@yarnpkg/lockfile": "^1.1.0",
-    "babel-jest": "^29.7.0",
     "eslint": "^8.56.0",
     "eslint-config-prettier": "^9.1.0",
     "eslint-plugin-jest": "^27.6.3",
     "eslint-plugin-prettier": "^5.1.3",
-    "jest": "^29.7.0",
     "prettier": "^3.2.4",
-    "svgo": "^3.2.0"
+    "svgo": "^3.2.0",
+    "uvu": "^0.5.6"
   }
 }

src/action.js

@@ -1,11 +1,11 @@
-const { debug, getBooleanInput, getInput, setFailed, warning } = require('@actions/core');
-const { context, getOctokit } = require('@actions/github');
-const fs = require('fs');
-const { Base64 } = require('js-base64');
-const path = require('path');
-
-const { STATUS, countStatuses, diffLocks, parseLock } = require('./utils');
-const { createTable, createSummary } = require('./comment');
+import { debug, getBooleanInput, getInput, setFailed, warning } from '@actions/core';
+import { context, getOctokit } from '@actions/github';
+import { Base64 } from 'js-base64';
+import fs from 'node:fs';
+import path from 'node:path';
+
+import { createTable, createSummary } from './comment.mjs';
+import { STATUS, countStatuses, diffLocks, parseLock } from './utils.mjs';
 
 const getCommentId = async (octokit, oktokitParams, issueNumber, commentHeader) => {
   const currentComments = await octokit.rest.issues.listComments({

src/comment.js → src/comment.mjs

@@ -1,6 +1,6 @@
-const { markdownTable } = require('markdown-table');
+import { markdownTable }from 'markdown-table';
 
-const { STATUS_ORDER, countStatuses } = require('./utils');
+import { STATUS_ORDER, countStatuses } from './utils.mjs';
 
 const ASSETS_URL = {
   ADDED: 'https://git.io/J38HP',

src/utils.js → src/utils.mjs

@@ -1,8 +1,8 @@
-const { warning } = require('@actions/core');
+import { warning } from '@actions/core';
 
-const semverCompare = require('semver/functions/compare');
-const semverCoerce = require('semver/functions/coerce');
-const semverValid = require('semver/functions/valid');
+import semverCompare from 'semver/functions/compare.js';
+import semverCoerce from 'semver/functions/coerce.js';
+import semverValid from 'semver/functions/valid.js';
 
 export const STATUS = {
   ADDED: 'ADDED',

tests/performance/parse.test.js → tests/performance/parse.test.mjs

@@ -1,7 +1,9 @@
-const lockfile = require('@yarnpkg/lockfile');
+import lockfile from '@yarnpkg/lockfile';
+import { test } from 'uvu';
+import { is } from 'uvu/assert';
 
-const { getTestLockContent } = require('../testUtils');
-const { parseLock } = require('../../src/utils');
+import { getTestLockContent } from '../testUtils.mjs';
+import { parseLock }from '../../src/utils.mjs';
 
 test('naive performance test', () => {
   const contentA = getTestLockContent('classic-downgrade', 'a.lock');
@@ -25,5 +27,7 @@ test('naive performance test', () => {
   const internalEnd = performance.now();
   console.timeEnd('Internal parser');
 
-  expect(end - start).toBeGreaterThan(internalEnd - internalStart);
+  is((end - start) > (internalEnd - internalStart), true);
 });
+
+test.run();

tests/unit/unit.test.mjs

@@ -0,0 +1,63 @@
+import { test } from 'uvu';
+import { is } from 'uvu/assert';
+
+import { diffLocks, STATUS, countStatuses, parseLock } from '../../src/utils.mjs';
+import { getTestLockContent } from '../testUtils.mjs';
+
+test('Yarn Classic - detect changes', () => {
+  const contentA = getTestLockContent('classic-downgrade', 'a.lock');
+  const contentB = getTestLockContent('classic-downgrade', 'b.lock');
+
+  const result = diffLocks(parseLock(contentA), parseLock(contentB));
+
+  is(Object.keys(result).length, 52);
+
+  is(countStatuses(result, STATUS.ADDED), 3);
+  is(countStatuses(result, STATUS.UPDATED), 49);
+  is(countStatuses(result, STATUS.DOWNGRADED), 0);
+  is(countStatuses(result, STATUS.REMOVED), 0);
+});
+
+test('Yarn Classic - no downgrade detected, multiple cases', () => {
+  const contentA = getTestLockContent('classic-downgrade-complex', 'a.lock');
+  const contentB = getTestLockContent('classic-downgrade-complex', 'b.lock');
+
+  const result = diffLocks(parseLock(contentA), parseLock(contentB));
+
+  is(Object.keys(result).length, 389);
+
+  is(countStatuses(result, STATUS.ADDED), 357);
+  is(countStatuses(result, STATUS.UPDATED), 32);
+  is(countStatuses(result, STATUS.DOWNGRADED), 0);
+  is(countStatuses(result, STATUS.REMOVED), 0);
+});
+
+test('Yarn Berry (v2) - detect changes', () => {
+  const contentA = getTestLockContent('berry-v2', 'a.lock');
+  const contentB = getTestLockContent('berry-v2', 'b.lock');
+
+  const result = diffLocks(parseLock(contentA), parseLock(contentB));
+
+  is(Object.keys(result).length, 6);
+
+  is(countStatuses(result, STATUS.ADDED), 1);
+  is(countStatuses(result, STATUS.UPDATED), 4);
+  is(countStatuses(result, STATUS.DOWNGRADED), 0);
+  is(countStatuses(result, STATUS.REMOVED), 1);
+});
+
+test('Yarn Berry (v3) - detect changes', () => {
+  const contentA = getTestLockContent('berry-v3', 'a.lock');
+  const contentB = getTestLockContent('berry-v3', 'b.lock');
+
+  const result = diffLocks(parseLock(contentA), parseLock(contentB));
+
+  is(Object.keys(result).length, 7);
+
+  is(countStatuses(result, STATUS.ADDED), 1);
+  is(countStatuses(result, STATUS.UPDATED), 5);
+  is(countStatuses(result, STATUS.DOWNGRADED), 0);
+  is(countStatuses(result, STATUS.REMOVED), 1);
+});
+
+test.run();