Core Foundation

/**
 * Declares that a file provides a namespace
 * @param {string} name - The namespace being provided
 */
goog.provide = function(name) {};

/**
 * Declares a dependency on another module
 * @param {string} name - The namespace being required
 */
goog.require = function(name) {};

/**
 * Declares an ES6-style module
 * @param {string} name - The module name
 */
goog.module = function(name) {};

/**
 * Gets a module by ID
 * @param {string} id - The module ID
 * @return {*} The module
 */
goog.module.get = function(id) {};

/**
 * Declares a module ID for ES6 modules
 * @param {string} id - The module ID
 */
goog.declareModuleId = function(id) {};

/**
 * Declares legacy namespace for ES6 modules
 */
goog.module.declareLegacyNamespace = function() {};

/**
 * Declares type-only dependency (for type annotations)
 * @param {string} namespace - The namespace being required for types only
 */
goog.requireType = function(namespace) {};

/**
 * Forward declares a namespace to avoid circular dependencies
 * @param {string} name - The namespace being forward declared
 */
goog.forwardDeclare = function(name) {};

/**
 * Defines a compile-time constant that can be overridden
 * @param {string} name - The constant name
 * @param {T} defaultValue - The default value
 * @return {T} The defined value
 * @template T
 */
goog.define = function(name, defaultValue) {};

/**
 * Debug mode flag - can be overridden at compile time
 * @type {boolean}
 */
goog.DEBUG;

/**
 * Current locale string
 * @type {string}
 */
goog.LOCALE;

/**
 * Trusted site flag for security features
 * @type {boolean}
 */
goog.TRUSTED_SITE;

/**
 * Browser feature set year baseline
 * @type {number}
 */
goog.FEATURESET_YEAR;

/**
 * Reference to the global object
 * @type {!Global}
 */
goog.global;

/**
 * Base path for script loading
 * @type {string}
 */
goog.basePath;

/**
 * Module type enumeration
 * @enum {string}
 */
goog.ModuleType;

/**
 * Gets the type of a value (more comprehensive than typeof)
 * @param {*} value - Value to get type of
 * @return {string} The type name
 */
goog.typeOf = function(value) {};

/**
 * Tests if a value is an object (not null)
 * @param {*} val - Value to test
 * @return {boolean} True if object and not null
 */
goog.isObject = function(val) {};

/**
 * Tests if a value is array-like (has length property)
 * @param {*} val - Value to test
 * @return {boolean} True if array-like
 */
goog.isArrayLike = function(val) {};

/**
 * Tests if a value is date-like (has getFullYear method)
 * @param {*} val - Value to test
 * @return {boolean} True if date-like
 */
goog.isDateLike = function(val) {};

/**
 * Gets a unique ID for an object
 * @param {Object} obj - Object to get ID for
 * @return {number} Unique ID
 */
goog.getUid = function(obj) {};

/**
 * Tests if an object has a unique ID
 * @param {Object} obj - Object to test
 * @return {boolean} True if has unique ID
 */
goog.hasUid = function(obj) {};

/**
 * Removes the unique ID from an object
 * @param {Object} obj - Object to remove ID from
 */
goog.removeUid = function(obj) {};

/**
 * Shallow clones an object
 * @param {Object} obj - Object to clone
 * @return {Object} Cloned object
 */
goog.cloneObject = function(obj) {};

/**
 * Gets an object by name from a namespace path
 * @param {string} name - Dot-separated object path
 * @param {Object=} opt_obj - Root object (default: global)
 * @return {*} The found object or undefined
 */
goog.getObjectByName = function(name, opt_obj) {};

/**
 * Sets up inheritance between constructor functions
 * @param {Function} childCtor - Child constructor
 * @param {Function} parentCtor - Parent constructor
 */
goog.inherits = function(childCtor, parentCtor) {};

/**
 * Binds a function to an object and optionally pre-fills arguments
 * @param {Function} fn - Function to bind
 * @param {Object} selfObj - Object to bind to
 * @param {...*} var_args - Arguments to pre-fill
 * @return {Function} Bound function
 */
goog.bind = function(fn, selfObj, var_args) {};

/**
 * Partially applies arguments to a function
 * @param {Function} fn - Function to partially apply
 * @param {...*} var_args - Arguments to pre-fill
 * @return {Function} Partially applied function
 */
goog.partial = function(fn, var_args) {};

/**
 * Defines a class using an object literal approach
 * @param {Function} superClass - Super class constructor
 * @param {Object} def - Class definition object
 * @return {Function} The class constructor
 */
goog.defineClass = function(superClass, def) {};

/**
 * Provides a scoped environment for code execution
 * @param {Function} fn - Function to execute in scope
 */
goog.scope = function(fn) {};

/**
 * Marks code as test-only (removed in production builds)
 * @param {string=} opt_message - Optional test-only message
 */
goog.setTestOnly = function(opt_message) {};

/**
 * Throws an error indicating an abstract method was called
 * @throws {Error}
 */
goog.abstractMethod = function() {};

/**
 * Adds a getInstance method to a constructor for singleton pattern
 * @param {Function} ctor - Constructor function
 */
goog.addSingletonGetter = function(ctor) {};

/**
 * Exports a symbol to the global scope
 * @param {string} publicPath - Public path for the symbol
 * @param {*} object - Object to export
 * @param {Object=} objectToExportTo - Target object (defaults to global)
 */
goog.exportSymbol = function(publicPath, object, objectToExportTo) {};

/**
 * Exports a property on an object
 * @param {Object} object - Object to export property on
 * @param {string} publicName - Public name for the property
 * @param {*} symbol - Symbol to export
 */
goog.exportProperty = function(object, publicName, symbol) {};

/**
 * Returns current timestamp in milliseconds
 * @return {number} Current time in milliseconds
 */
goog.now = function() {};

/**
 * Evaluates JavaScript code in global context
 * @param {string} script - JavaScript code to evaluate
 * @return {*} Result of evaluation
 */
goog.globalEval = function(script) {};

/**
 * Gets CSS class name with optional modifier, handles obfuscation
 * @param {string} className - Base CSS class name
 * @param {string=} opt_modifier - Optional modifier string
 * @return {string} CSS class name (possibly obfuscated)
 */
goog.getCssName = function(className, opt_modifier) {};

/**
 * Sets CSS name mapping for obfuscation
 * @param {Object} mapping - Mapping object from original to obfuscated names
 * @param {string=} opt_style - Mapping style ('BY_WHOLE' or 'BY_PART')
 */
goog.setCssNameMapping = function(mapping, opt_style) {};

/**
 * Gets localized message with optional placeholder values
 * @param {string} str - Message template with placeholders
 * @param {Object=} opt_values - Values for placeholders
 * @param {Object=} opt_options - Formatting options
 * @return {string} Localized message
 */
goog.getMsg = function(str, opt_values, opt_options) {};

/**
 * Gets localized message with fallback
 * @param {string} a - Primary message
 * @param {string} b - Fallback message  
 * @return {string} Localized message
 */
goog.getMsgWithFallback = function(a, b) {};

/**
 * Loads a module using provided module definition
 * @param {string} moduleDef - Module definition string
 */
goog.loadModule = function(moduleDef) {};

/**
 * Adds dependency information for a file
 * @param {string} relPath - Relative path to file
 * @param {Array<string>} provides - Namespaces provided by file
 * @param {Array<string>} requires - Namespaces required by file
 * @param {Object=} opt_loadFlags - Loading flags
 */
goog.addDependency = function(relPath, provides, requires, opt_loadFlags) {};

/**
 * Creates a Trusted Types policy for CSP compatibility
 * @param {string} name - Policy name
 * @return {*} Trusted Types policy object
 */
goog.createTrustedTypesPolicy = function(name) {};

// Module system usage
goog.provide('my.namespace.MyClass');
goog.require('goog.dom');

// Type checking
if (goog.isString(userInput)) {
    console.log('Input is a string:', userInput.length);
}

// Class inheritance
function Parent() {}
function Child() {
    Parent.call(this);
}
goog.inherits(Child, Parent);

// Function binding
var boundFunction = goog.bind(this.method, this, arg1, arg2);

// Configuration
goog.define('MY_APP.DEBUG_ENABLED', true);