Add eslint and prettier config files

order-syncer/.eslintignore

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+node_modules

order-syncer/.eslintrc.cjs

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+module.exports = {
+    root: true,
+    extends: ['eslint:recommended'],
+    parserOptions: {
+        ecmaVersion: 2020,
+        sourceType: 'module',
+    },
+    rules: {
+        'no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
+        'no-undef': 'error',
+        'no-console': 'error',
+        'no-const-assign': 'error',
+    },
+    env: {
+        es6: true,
+        jest: true,
+        node: true, //adds things like process to global
+    },
+};

order-syncer/.prettierrc

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+{
+    "trailingComma": "es5",
+    "singleQuote": true,
+    "parser": "babel",
+    "overrides": [
+      {
+        "files": "*.json",
+        "options": {
+          "parser": "json"
+        }
+      }
+    ]
+}

order-syncer/babel.config.cjs

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+module.exports = {
+    presets: [['@babel/preset-env', {targets: {node: 'current'}}]],
+};

order-syncer/jest.config.cjs

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+module.exports = {
+    displayName: 'Tests Javascript Application - Service',
+    moduleDirectories: ['node_modules', 'src'],
+    testMatch: ['**/tests/**/*.js?(x)', '**/?(*.)+(spec|test).js?(x)'],
+    testEnvironment: 'node',
+    verbose: true,
+    silent: true,
+};

tax-calculator/.eslintignore

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+node_modules

tax-calculator/.eslintrc.cjs

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+module.exports = {
+    root: true,
+    extends: ['eslint:recommended'],
+    parserOptions: {
+        ecmaVersion: 2020,
+        sourceType: 'module',
+    },
+    rules: {
+        'no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
+        'no-undef': 'error',
+        'no-console': 'error',
+        'no-const-assign': 'error',
+    },
+    env: {
+        es6: true,
+        jest: true,
+        node: true, //adds things like process to global
+    },
+};

tax-calculator/.prettierrc

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+{
+    "trailingComma": "es5",
+    "singleQuote": true,
+    "parser": "babel",
+    "overrides": [
+      {
+        "files": "*.json",
+        "options": {
+          "parser": "json"
+        }
+      }
+    ]
+}

tax-calculator/babel.config.cjs

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+module.exports = {
+    presets: [['@babel/preset-env', {targets: {node: 'current'}}]],
+};

tax-calculator/jest.config.cjs

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+module.exports = {
+    displayName: 'Tests Javascript Application - Service',
+    moduleDirectories: ['node_modules', 'src'],
+    testMatch: ['**/tests/**/*.js?(x)', '**/?(*.)+(spec|test).js?(x)'],
+    testEnvironment: 'node',
+    verbose: true,
+    silent: true,
+};