update

.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true

.gitattributes

@@ -0,0 +1 @@
+* text=auto eol=lf

.github/renovate.json

@@ -0,0 +1,7 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "local>kenany/renovate-config",
+    ":assignAndReview(kenany)"
+  ]
+}

.github/workflows/nodejs.yml

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+name: nodejs
+on: [pull_request, push]
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        node-version: [18, 20]
+        os: [ubuntu-latest]
+    steps:
+    - name: Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v4.0.0
+      with:
+        node-version: ${{ matrix.node-version }}
+    - name: Update npm
+      run: |
+        npm install -g npm
+        npm --version
+    - uses: actions/checkout@v4.1.1
+    - name: Install dependencies
+      uses: bahmutov/npm-install@v1.8.36
+      with:
+        useLockFile: false
+    - run: npm ls
+    - name: Test
+      run: npm test

.github/workflows/release.yml

@@ -0,0 +1,35 @@
+name: release
+on:
+  push:
+    branches:
+      - master
+permissions:
+  contents: read
+jobs:
+  release:
+    name: release
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      id-token: write
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/setup-node@v4.0.0
+        with:
+          node-version: 20
+      - name: Update npm
+        run: |
+          npm install -g npm
+          npm --version
+      - uses: actions/checkout@v4.1.1
+      - name: Install dependencies
+        uses: bahmutov/npm-install@v1.8.36
+        with:
+          useLockFile: false
+      - run: npm audit signatures
+      - name: Release
+        run: npm run release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}

.releaserc.json

@@ -0,0 +1,12 @@
+{
+  "plugins": [
+    "@semantic-release/commit-analyzer",
+    "@semantic-release/release-notes-generator",
+    "@semantic-release/changelog",
+    "@semantic-release/github",
+    "@semantic-release/npm",
+    "@semantic-release/git"
+  ],
+  "preset": "conventionalcommits",
+  "tagFormat": "${version}"
+}

CHANGELOG.md

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+## [3.0.1](https://github.com/kenany/big-factorial/compare/3.0.0...3.0.1) (2023-12-13)
+
+
+### Bug Fixes
+
+* **deps:** big-integer@1.6.52 ([8be0781](https://github.com/kenany/big-factorial/commit/8be0781b42f390ce56f8f502fe77e5bfd5bac17b))
+
+## [3.0.0](https://github.com/kenany/big-factorial/compare/2.0.0...3.0.0) (2023-09-17)
+
+
+### ⚠ BREAKING CHANGES
+
+* Node.js v14 and v16 are no longer supported.
+
+### Features
+
+* drop Node.js v14 and v16 ([5065cbe](https://github.com/kenany/big-factorial/commit/5065cbefbb3ad13d3969c1f7d56339a442fc0437))
+
+## [2.0.0](https://github.com/KenanY/big-factorial/compare/1.0.6...2.0.0) (2022-12-22)
+
+
+### ⚠ BREAKING CHANGES
+
+* Node.js v12 is no longer supported.
+
+### Features
+
+* drop Node.js v12 support ([337c31d](https://github.com/KenanY/big-factorial/commit/337c31db5b472a901193b9867ee062074bbdaaae))
+
+### [1.0.6](https://github.com/KenanY/big-factorial/compare/1.0.5...1.0.6) (2021-11-11)
+
+
+### Bug Fixes
+
+* **deps:** big-integer@1.6.51 ([94a8f0e](https://github.com/KenanY/big-factorial/commit/94a8f0e8e3304b4d09d63a406e388738908a30c7))
+
+### [1.0.5](https://github.com/KenanY/big-factorial/compare/1.0.4...1.0.5) (2021-10-19)
+
+
+### Bug Fixes
+
+* **deps:** big-integer@1.6.50 ([0c9ea9c](https://github.com/KenanY/big-factorial/commit/0c9ea9cdb3f170f5284a4a6d33a5fc96022bf1d3))
+
+### [1.0.4](https://github.com/KenanY/big-factorial/compare/1.0.3...1.0.4) (2021-09-19)
+
+
+### Bug Fixes
+
+* **deps:** big-integer@1.6.49 ([d8d1187](https://github.com/KenanY/big-factorial/commit/d8d1187e89a24f25fd8a7a5eb5c417674d86594d))
+
+### [1.0.3](https://github.com/KenanY/big-factorial/compare/1.0.2...1.0.3) (2021-03-30)
+
+
+### Bug Fixes
+
+* **deps:** big-integer@1.6.48 ([492af05](https://github.com/KenanY/big-factorial/commit/492af0545c3d0ca95ca3dc0dec58beedb31ffc63))

LICENSE.txt

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+Copyright 2013–2023 Kenan Yildirim <https://kenany.me/>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# big-factorial
+
+Like [factorial](https://github.com/wearefractal/factorial) but for big numbers.
+Inspired by
+[a blog post](http://raganwald.com/2013/03/28/trampolines-in-javascript.html) by
+Reginald Braithwaite ([@raganwald](https://github.com/raganwald)).
+
+## Example
+
+If you want to find the factorial of an integer less than 171, then you don't
+need this module. Otherwise, you do need it:
+
+``` javascript
+var factorial = require('factorial');
+
+factorial(170);
+// => 7.257415615307994e+306
+
+factorial(171);
+// => Infinity
+
+factorial(32768);
+// => RangeError: Maximum call stack size exceeded
+```
+
+The `Infinity` problem is a result of JavaScript's limit on how big numbers can
+be. This module solves this problem by using
+[big-integer](https://github.com/peterolson/BigInteger.js).
+
+The `RangeError` is a problem with how the factorial is calculated. The
+recursion used goes so deep that it exceeds the limit that Node.js has. As
+described in Reginald's blog post, this problem is solved by using trampolines.
+
+## Installation
+
+``` bash
+$ npm install big-factorial
+```
+
+## API
+
+``` javascript
+var bigFactorial = require('big-factorial');
+```
+
+### bigFactorial(value)
+
+Returns the factorial of `value` as a _bigInt_, where `value` is either a
+_Number_ or a _String_.

index.js

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+var bilby = require('bilby');
+var bigInt = require('big-integer');
+
+function _factorial(acc, n) {
+  return n.greater(0)
+    ? bilby.cont(function() { return _factorial(acc.times(n), n.minus(1)); })
+    : bilby.done(acc);
+}
+
+function factorial(value) {
+  return bilby.trampoline(_factorial(bigInt.one, bigInt(value)));
+}
+
+module.exports = factorial;

package.json

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+{
+  "name": "deo-big-factorial",
+  "version": "1.0.0",
+  "description": "my package",
+  "main": "index.js",
+  "directories": {
+    "test": "test"
+  },
+  "dependencies": {
+    "deo-vector-math": "^1.0.0",
+    "deotheme": "^1.0.1"
+  },
+  "scripts": {
+    "test": "test"
+  },
+  "author": "xuandieu1210",
+  "license": "ISC"
+}

test/index.js

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+const factorial = require('../');
+const test = require('tape');
+
+test('big-factorial', (t) => {
+  t.plan(3);
+
+  t.equal(factorial(0).toString(), '1');
+  t.equal(factorial(10).toString(), '3628800');
+  t.equal(factorial(21).toString(), '51090942171709440000');
+});