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externs-and-exports

Closure Compiler Closure Compiler Home Products Closure Tools Closure Compiler Was this helpful? Externs and Exports Purpose of Externs Externs are declarations that tell Closure Compiler the names of symbols that should not be renamed during advanced compilation. They are called externs because these symbols are most often defined by code outside the compilation, such a native code, or third-party libraries. For this reason, externs often also have type annotations, so that Closure Compiler can typecheck your use of those symbols. In general, it is best to think of externs as an API contract between the implementor and the consumers of some piece of compiled code. The externs define what the implementor promises to supply, and what the consumers can depend on using. Both sides need a copy of the contract. Externs are similar to header files in other languages. Externs Syntax Externs are files that look very much like normal JavaScript annotated for Closure Compiler. The main difference is that their contents are never printed as part of the compiled output, so none of the values are meaningful, only the names and types. Below is an example of an externs file for a simple library. // The `@externs` annotation is the best way to indicate a file contains externs. /** * @fileoverview Public API of my_math.js. * @externs */ // Externs often declare global namespaces. const myMath = {}; // Externs can declare functions, most importantly their names. /** * @param {number} x * @param {number} y * @return {!myMath.DivResult} */ myMath.div = function(x, y) {}; // Note the empty body. // Externs can contain type declarations, such as classes and interfaces. /** The result of an integer division. */ myMath.DivResult = class { // Constructors are special; member fields can be declared in their bodies. constructor() { /** @type {number} */ this.quotient; /** @type {number} */ this.remainder; } // Methods can be declared as usual; their bodies are meaningless though. /** @return {!Array<number>} */ toPair() {} }; // Fields and methods can also be declared using prototype notation. /** * @override * @param {number=} radix */ myMath.DivResult.prototype.toString = function(radix) {}; The --externs Flag Generally, the @externs annotation is the best way to inform the compiler that a file contains externs. Such files can be included as normal source files using the --js command-line flag, However, there is another, older way, to specify externs files. The --externs command-line flag can be used to pass externs files explicitly. This method is not recommended. Using Externs The externs from above can be consumed as follows. /** * @fileoverview Do some math. */ /** * @param {number} x * @param {number} y * @return {number} */ export function greatestCommonDivisor(x, y) { while (y != 0) { const temp = y; // `myMath` is a global, it and `myMath.div` are never renamed. const result = myMath.div(x, y); // `remainder` is also never renamed on instances of `DivResult`. y = result.remainder; x = temp; } return x; } How to Include Externs with the Closure Compiler Service API Both the Closure Compiler application and the Closure Compiler service API allow extern declarations. However, the Closure Compiler service UI does not provide an interface element for specifying externs files. There are three ways to send an extern declaration to the Closure Compiler service: Pass a file containing the @externs annotation as a source file. Pass JavaScript to the Closure Compiler service in the js_externs parameter. Pass the URL of a JavaScript file to the Closure Compiler service in the externs_url parameter. The only difference between using js_externs and using externs_url is how the JavaScript gets communicated to the Closure Compiler service. Purpose of Exports Exports are another mechanism for giving symbols consistent names after compilation. They are less useful than externs and often confusing. For all but simple cases they are best avoided. Exports rely on the fact that Closure Compiler doesn't modify string literals. By assigning an object to a property named using a literal, the object will be available through that property name even after compilation. Below is a simple example. /** * @fileoverview Do some math. */ // Note that the concept of module exports is totally unrelated. /** @return {number} */ export function myFunction() { return 5; } // This assignment ensures `myFunctionAlias` will be a global alias exposing `myFunction`, // even after compilation. window['myFunctionAlias'] = myFunction; If you are using Closure Library, exports can also be declared using the goog.exportSymbol and goog.exportProperty functions. More information is available in the Closure Library documentation of these functions. However, be aware they have special compiler support and will be totally transformed in the compiled output. Issues with Exports Exports are different from externs in that they only create an exposed alias for consumers to reference. Within the compiled code, the exported symbol will still be renamed. For this reason, exported symbols must be constant, since reassigning them in your code would cause the exposed alias to point to the wrong thing. This subtlety in renaming is especially complicated with respect to exported instance properties. In theory, exports can allow smaller code-size compared to externs, since long names can still be changed to shorter ones within your code. In practice, these improvements are often very minor, and don't justify the confusion exports create. Exports also don't provide an API for consumers to follow in the way externs do. Compared to exports, externs document the symbols you intend to expose, their types, and give you a place to add usage information. Additionally, if your consumers are also using Closure Compiler, they will need externs to compile against.

google-chat-app

Events in Google Chat Most Apps Script interactions with Google Chat are event-driven. The interaction between the user, the Chat app, and Google Chat typically follows this sequence: A user initiates an action, like adding a Chat app to a space, starting a direct message (DM) with a Chat app, or removing a Chat app from a space. The action raises an event aimed at the Chat app in Google Chat. Google Chat calls the corresponding event handler defined in the Chat app's script. Google Chat raises four events that your app can listen for: ADDED_TO_SPACE: This event occurs when a human user adds a Chat app to a space or a direct message (DM). In Apps Script, you define an onAddToSpace() function to handle this event. REMOVED_FROM_SPACE: This event occurs when a user removes the Chat app from a space or DM. This event does not post a response back to Google Chat. In Apps Script, you define an onRemoveFromSpace() function to handle this event. MESSAGE: This event occurs when a user messages the Chat app, either directly in a DM or as an @mention in a space. In Apps Script, you define an onMessage() function to respond to this event. CARD_CLICKED: This event occurs when the user clicks a button with a custom action assigned to it. In Apps Script, you define an onCardClick() function to respond to this event. Replace the contents of the Code.gs file with the following code that defines handlers for the ADDED_TO_SPACE and REMOVE_FROM_SPACE events. (You'll add handlers for the MESSAGE and CARD_CLICKED events later in this codelab.)

google-cloud-documentation

Find guides, code samples, architectural diagrams, best practices, tutorials, API references, and more to learn how to build on Google Cloud. Get started Start using Google Cloud. Learn more Code samples Browse all available Google Cloud code samples. Learn more Cloud Architecture Center Discover best practices and tutorials. Learn more Release notes View recent changes to Google Cloud products. Learn more

idetrust

HOME » SOFTWARE SOLUTIONS » IDETRUST VERIFICATION APP MOBILE VEHICLE IDENTIFICATION ON YOUR SMARTPHONE

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npm-install-firebase

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pay-server-demos

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ToolsGoogle Workspace Status DashboardGoogle Workspace Status DashboardData ExportData ExportTransfer tool for unmanaged usersTransfer tool for unmanaged usersGoogle Meet video setupGoogle Meet video setupGoogle Workspace MarketplaceGoogle Workspace MarketplaceGet help from a partnerGet help from a partner

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visualstudio-docs

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wordpress.com

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