feat(core): initial code commit

.editorconfig

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+# EditorConfig: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+charset = utf-8
+end_of_line = lf
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+
+# 2 space indentation
+[*.yaml, *.yml]
+indent_style = space
+indent_size = 2

.github/workflows/tests.yml

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+name: Tests
+on: ['push', 'pull_request']
+jobs:
+  test:
+    name: Node.js ${{ matrix.node-version }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [^12, ^14, ^16, ^17]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install
+      - run: npm test

.gitignore

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+# Global
+node_modules/
+
+# OS Generated
+.DS_Store*
+ehthumbs.db
+Icon?
+Thumbs.db
+*.swp
+
+# phpstorm
+.idea/*

CHANGELOG.md

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+<a name="1.0.0"></a>
+# [1.0.0](https://github.com/faker-javascript/letter) (2022-01-08)
+* Initial release

LICENSE

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+MIT License
+
+Copyright (c) Sergey Romanenko
+
+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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-# letter
+<h1 align="center">Letter</h1>
+<p align="center">
 Letter package provides functionality to generate a fake letter value.
+</p>
+
+<p align="center">
+<a href="https://github.com/faker-javascript/letter/releases"><img alt="Version" src="https://img.shields.io/github/release/faker-javascript/letter.svg?label=version&color=green"></a> <a href="https://github.com/faker-javascript/letter"><img src="https://img.shields.io/badge/license-MIT-blue.svg?color=green" alt="License"></a> <img src="https://github.com/faker-javascript/letter/actions/workflows/tests.yml/badge.svg">
+
+## Install
+
+```
+$ npm install --save @fakerjs/letter
+```
+
+## Usage
+
+```js
+import fakeLetter from '@glowyjs/letter';
+
+fakeLetter();
+//=> a
+
+fakeLetter({'casing': 'upper'});
+//=> A
+```
+
+## Tests
+
+Run tests
+
+```
+npm run test
+```
+
+## License
+[The MIT License (MIT)](https://github.com/faker-javascript/letter/blob/master/LICENSE.txt)
+Copyright (c) [Sergey Romanenko](https://github.com/Awilum)

index.js

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+export default function fakeLetter(options) {
+    let keyspace = "abcdefghijklmnopqrstuvwxyz";
+    let letter = keyspace.charAt(Math.floor(Math.random() * keyspace.length));
+    options = options || {};
+    return (options.casing === 'upper' ? letter.toUpperCase() : letter);
+};

package.json

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+{
+  "name": "@fakerjs/letter",
+  "version": "1.0.0",
+  "description": "Letter package provides functionality to generate a fake letter value.",
+  "license": "MIT",
+  "repository": "fakerjs/letter",
+  "author": {
+    "name": "Sergey Romanenko",
+    "email": "[email protected]",
+    "url": "https://github.com/Awilum"
+  },
+  "type": "module",
+  "exports": "./index.js",
+  "engines": {
+    "node": ">=12"
+  },
+  "scripts": {
+    "test": "ava"
+  },
+  "devDependencies": {
+    "ava": "^3.15.0"
+  },
+  "files": [
+    "index.js"
+  ],
+  "keywords": [
+    "fakerjs",
+    "fake",
+    "random",
+    "strings",
+    "string",
+    "letter",
+    "str"
+  ]
+}

test.js

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+import fakeLetter from './index.js';
+import test from 'ava';
+
+test('fakeLetter return type to be string', t => {
+	t.is(typeof fakeLetter(), 'string');
+});
+
+test('fakeLetter string length less eq 1', t => {
+	t.is(fakeLetter().length, 1);
+	t.is(fakeLetter({ casing: 'upper' }).length, 1);
+	t.is(fakeLetter({ casing: 'lower' }).length, 1);
+});