Basic files

.editorconfig

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+# EditorConfig is awesome: http://EditorConfig.org
+
+root = true;
+
+[*]
+#  Ensure there's no lingering whitespace
+trim_trailing_whitespace = true
+# Ensure a newline at the end of each file
+insert_final_newline = true
+
+[*.js]
+# Unix-style newlines
+end_of_line = lf
+charset = utf-8
+indent_style = space
+indent_size = 2

.gitignore

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+# Logs
+logs
+*.log
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directory
+# Commenting this out is preferred by some people, see
+# https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git-
+node_modules
+bower_components
+.nyc_output
+coverage
+tmp
+docs
+
+# Users Environment Variables
+.lock-wscript
+
+# Editors
+.idea

package.json

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+{
+  "name": "demo",
+  "version": "0.0.1",
+  "main": "src/index.js",
+  "scripts": {
+
+  }
+}

src/index.js

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+const SIPCalculations = require('./sip');
+
+module.exports = SIPCalculations;

src/sip.js

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+// @ts-check
+
+const Calculations = {
+
+  /**
+   * @description Get minimum SIP amount
+   * @returns {number} - Returns here
+   * @param {Array<number>} priceArray - Input here
+   */
+  getMaxAmount(priceArray) {
+    const maxPrice = Math.max(...priceArray);
+    return maxPrice;
+  },
+
+  /**
+   * Get total value of the order from order config
+   * @returns {number} - Output A
+   * @param {import('./types').OrderConfig} orderConfig - Input A
+   * @param {import('./types').SidPriceMap} sidPriceMap - Input B
+   */
+  calculateOrderTotalValue: function calculateOrderTotalValue(orderConfig, sidPriceMap) {
+    const totalValue = orderConfig.reduce((prevValue, eachSidConfig) => {
+      const sidPrice = sidPriceMap[eachSidConfig.sid];
+      const currentConfigValue = sidPrice * eachSidConfig.shares;
+      return (prevValue + currentConfigValue);
+    }, 0);
+
+    return totalValue;
+  }
+};
+
+module.exports = Calculations;

src/types.ts

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+export type sid = string;
+
+export interface OrderConfigElement {
+    sid: sid;
+    shares: number,
+}
+
+export type OrderConfig = Array<OrderConfigElement>;
+
+export interface SidPriceMap {
+    [sid: string]: number;
+}

tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "allowJs": true
+    },
+    "include": [
+        "src/**/*"
+    ],
+    "exclude": [
+        "node_modules"
+    ]
+}