Library structure

.editorconfig

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+# EditorConfig helps developers define and maintain consistent coding styles between different editors and IDEs
+# editorconfig.org
+root = true
+
+# all files
+[*]
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+charset = utf-8
+trim_trailing_whitespace = true
+max_line_length = 80
+
+[*.{js,ts}]
+quote_type = single
+curly_bracket_next_line = false
+
+# HTML
+[*.html]
+quote_type = double

.eslintrc.json

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+{
+  "env": {
+    "browser": true,
+    "es2021": true,
+    "node": true
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended"
+  ],
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": 12,
+    "sourceType": "module"
+  },
+  "plugins": [
+    "@typescript-eslint"
+  ],
+  "rules": {
+    "indent": [
+      "error",
+      2
+    ],
+    "linebreak-style": [
+      "error",
+      "unix"
+    ],
+    "max-len": [
+      "warn",
+      120
+    ],
+    "quotes": [
+      "error",
+      "single"
+    ],
+    "semi": [
+      "error",
+      "always"
+    ]
+  }
+}

.gitignore

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+*.log
+*.tmp
+*.tmp.*
+.idea
+.DS_Store
+.cache
+node_modules
+
+dist
+coverage

.travis.yml

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+language: node_js
+node_js: 14.15.1
+cache: npm
+notifications:
+  slack:
+    secure: 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
+  email: false

.vscode/settings.json

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+// Place your settings in this file to overwrite default and user settings.
+{
+  "editor.tabSize": 2,
+  "editor.rulers": [
+    120
+  ]
+}

jest.config.ts

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+import type { Config } from '@jest/types';
+
+const config: Config.InitialOptions = {
+  coverageThreshold: {
+    global: {
+      functions: 90,
+      lines: 90,
+      statements: 90,
+    },
+  },
+  preset: 'ts-jest',
+  testEnvironment: 'jsdom', // TODO: run tests through both 'node' and 'jsdom'
+  verbose: true
+};
+export default config;