feat: adds initial app implementation

Author: anthonydmays

lesson_10/libraries/.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+insert_final_newline = true
+quote_type = single

lesson_10/libraries/.eslintignore

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+build/

lesson_10/libraries/.prettierignore

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+# Ignore artifacts:
+build
+coverage

lesson_10/libraries/.prettierrc

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+{}

lesson_10/libraries/eslint.config.js

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+// @ts-check
+
+import eslint from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import eslintConfigPrettier from 'eslint-config-prettier';
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  ...tseslint.configs.strict,
+  ...tseslint.configs.stylistic,
+  eslintConfigPrettier,
+  {
+    ignores: ['build'],
+  },
+);

lesson_10/libraries/jest.config.js

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+/** @type {import('ts-jest').JestConfigWithTsJest} **/
+export default {
+  testEnvironment: 'node',
+  transform: {
+    '^.+.tsx?$': ['ts-jest', { useESM: true }],
+  },
+  moduleNameMapper: {
+    '^(\\.\\.?\\/.+)\\.js$': '$1',
+  },
+  extensionsToTreatAsEsm: ['.ts'],
+};