chore: add project dependencies and configuration files

Initial setup of project dependencies including axios, express, dotenv, and other supporting packages. Added configuration files and documentation for project setup and usage.

node_modules/axios/lib/helpers/validator.js

@@ -0,0 +1,99 @@
+'use strict';
+
+import {VERSION} from '../env/data.js';
+import AxiosError from '../core/AxiosError.js';
+
+const validators = {};
+
+// eslint-disable-next-line func-names
+['object', 'boolean', 'number', 'function', 'string', 'symbol'].forEach((type, i) => {
+  validators[type] = function validator(thing) {
+    return typeof thing === type || 'a' + (i < 1 ? 'n ' : ' ') + type;
+  };
+});
+
+const deprecatedWarnings = {};
+
+/**
+ * Transitional option validator
+ *
+ * @param {function|boolean?} validator - set to false if the transitional option has been removed
+ * @param {string?} version - deprecated version / removed since version
+ * @param {string?} message - some message with additional info
+ *
+ * @returns {function}
+ */
+validators.transitional = function transitional(validator, version, message) {
+  function formatMessage(opt, desc) {
+    return '[Axios v' + VERSION + '] Transitional option \'' + opt + '\'' + desc + (message ? '. ' + message : '');
+  }
+
+  // eslint-disable-next-line func-names
+  return (value, opt, opts) => {
+    if (validator === false) {
+      throw new AxiosError(
+        formatMessage(opt, ' has been removed' + (version ? ' in ' + version : '')),
+        AxiosError.ERR_DEPRECATED
+      );
+    }
+
+    if (version && !deprecatedWarnings[opt]) {
+      deprecatedWarnings[opt] = true;
+      // eslint-disable-next-line no-console
+      console.warn(
+        formatMessage(
+          opt,
+          ' has been deprecated since v' + version + ' and will be removed in the near future'
+        )
+      );
+    }
+
+    return validator ? validator(value, opt, opts) : true;
+  };
+};
+
+validators.spelling = function spelling(correctSpelling) {
+  return (value, opt) => {
+    // eslint-disable-next-line no-console
+    console.warn(`${opt} is likely a misspelling of ${correctSpelling}`);
+    return true;
+  }
+};
+
+/**
+ * Assert object's properties type
+ *
+ * @param {object} options
+ * @param {object} schema
+ * @param {boolean?} allowUnknown
+ *
+ * @returns {object}
+ */
+
+function assertOptions(options, schema, allowUnknown) {
+  if (typeof options !== 'object') {
+    throw new AxiosError('options must be an object', AxiosError.ERR_BAD_OPTION_VALUE);
+  }
+  const keys = Object.keys(options);
+  let i = keys.length;
+  while (i-- > 0) {
+    const opt = keys[i];
+    const validator = schema[opt];
+    if (validator) {
+      const value = options[opt];
+      const result = value === undefined || validator(value, opt, options);
+      if (result !== true) {
+        throw new AxiosError('option ' + opt + ' must be ' + result, AxiosError.ERR_BAD_OPTION_VALUE);
+      }
+      continue;
+    }
+    if (allowUnknown !== true) {
+      throw new AxiosError('Unknown option ' + opt, AxiosError.ERR_BAD_OPTION);
+    }
+  }
+}
+
+export default {
+  assertOptions,
+  validators
+};