Update dependencies and package

This updates the package to modern standards.

Author: nfischer

.eslintrc.json

@@ -2,29 +2,45 @@
   "env": {
     "node": true
   },
-  "extends": "airbnb-base/legacy",
+  "extends": "airbnb-base",
   "rules": {
     "comma-dangle": ["error", "always-multiline"],
     "consistent-return": "off",
     "curly": ["error", "multi-line"],
     "func-names": "off",
+    "function-call-argument-newline": "off",
+    "function-paren-newline": "off",
     "global-require": "off",
+    "import/no-unresolved": "off",
     "indent": "off",
     "max-len": "off",
     "newline-per-chained-call": "off",
+    "no-bitwise": "off",
     "no-console": "off",
+    "no-continue": "off",
     "no-else-return": "off",
     "no-empty": "off",
     "no-mixed-operators": "off",
     "no-multi-spaces": "off",
     "no-multiple-empty-lines": ["error", { "max": 2, "maxBOF": 0, "maxEOF": 0 } ],
     "no-param-reassign": "off",
+    "no-plusplus": "off",
     "no-prototype-builtins": "off",
     "no-throw-literal": "off",
     "no-underscore-dangle": "off",
     "no-use-before-define": "off",
+    "no-var": "off",
+    "operator-linebreak": "off",
+    "prefer-arrow-callback": "off",
+    "prefer-destructuring": "off",
+    "prefer-numeric-literals": "off",
+    "prefer-object-spread": "off",
+    "prefer-rest-params": "off",
+    "prefer-spread": "off",
+    "prefer-template": "off",
     "quote-props": "off",
     "spaced-comment": ["error", "always", { "markers": ["@", "@include"], "exceptions": ["@", "@commands"] }],
+    "strict": "off",
     "vars-on-top": "off",
     "new-cap": ["error", {
       "capIsNewExceptions": [

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,17 @@
+<!--
+Before posting your issue, please check our FAQ:
+    https://github.com/shelljs/shelljs/wiki/FAQ
+-->
+### Node version (or tell us if you're using electron or some other framework):
+
+### ShellJS version (the most recent version/Github branch you see the bug on):
+
+### Operating system:
+
+### Description of the bug:
+
+### Example ShellJS command to reproduce the error:
+
+```javascript
+
+```

.github/SECURITY.md

@@ -0,0 +1,31 @@
+# ShellJS Security Policy
+
+Thank you for reaching out regarding the security of the ShellJS module! Please
+note that this project is maintained on a best-effort basis, however I still
+intend to prioritize reviewing and addressing security issues.
+
+## Supported Versions
+
+I generally only support the latest ShellJS release (see
+https://www.npmjs.com/package/shelljs). My goal is to release security fixes as
+patch releases on top of whatever was most recently shipped.
+
+If breaking changes have already landed on the main development branch, I may
+apply the patch on the relevant release branch (ex.
+[`0.8-release`](https://github.com/shelljs/shelljs/commits/0.8-release)) and
+create a new release from there.
+
+## Reporting a Vulnerability
+
+Please report security vulnerabilities to ntfschr@gmail.com. I should respond
+within a few days. Although it's not strictly required, it helps me out if you
+can include any proof of concept exploit code, suggested fix, etc.
+
+**Please do not publicly disclose the suspected vulnerability** until I have a
+chance to review your report. I'd like a chance to patch the code before the
+issue is known to the public.
+
+Please **only** use this email for security issues. It's also OK to use the
+email if you're legitimately unsure if this is a security issue (better safe
+than sorry). But for all other non-security issues, please use the GitHub issue
+tracker.

.github/workflows/main.yml

@@ -0,0 +1,32 @@
+name: CI
+on:
+  - push
+  - pull_request
+jobs:
+  test:
+    name: Node.js ${{ matrix.node-version }} on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version:
+          - 18
+          - 20
+          - 22
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install
+      - name: test with coverage
+        run: npm run test
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: true