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typescript symbol type

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Make sure the TypeScript Language Service checkbox is selected. Example. First call to Symbol.for creates a symbol, second call uses the same symbol. To open the tool window, click the Inspection widget in the upper-right corner of the editor: See View problems and apply quick-fixes in the editor and Problems tool window for details. WebStorm recognizes .ts and .tsx files and provides full range of coding assistance for editing them without any additional steps from your side. By default, parameter hints are shown only for values that are literals or function expressions but not for named objects. The parameter is an optional description. TypeScript in 50 Lessons, published by Smashing Magazine. You can navigate from a variable, a field, a method, or any other symbol to its type declaration. // Implicit any as JSON.parse doesn't know what type of data it returns so it can be "any" thing W3Schools is optimized for learning and training. The symbol is a special primitive type that represents Unique values or keys of an object. On that level we only have one property propertyWithTypeAlias: NestedObjectType in our original type definition, so we can save us one loop and simply extract the first element and name it propertyWithTypeAlias. Symbols stand at the intersection between nominal and opaque types in TypeScript and JavaScript. Expand the Types node, and then the TypeScript node. WebStorm brings you to the superclass with the cursor at the overridden method. Go to type declaration of a symbol. or we can say either of the specified types is permissible. Javascript actually has a typeof operator itself that can tell you which type a variable is. error TS2322: Type () => void is not assignable to type string | number | boolean.Type () => void is not assignable to type true. What does symbol tilde (~) denotes in CSS ? Alternatively, press Shift+F1 or choose View | External Documentation from the main menu. In the below example we created a function and we defined a union type that either takes a string or a number. What is this??? let sym2 = Symbol("key"); If you choose one of the suggestions from another file or . Our enum Colors includes only symbols TypeScript-aware coding assistance includes completion for keywords, labels, variables, parameters, and functions, error and syntax highlighting, formatting, numerous code inspections and quick-fixes, as well as common and TypeScript-specific refactoring. Code navigation lets you quickly navigate TypeScript projects. In this example, VS Code adds an import for Hercules to the top of the file: You can disable auto imports by setting "typescript.suggest.autoImports": false. Press Ctrl+Alt+B or click in the gutter and then select the relevant class from the list. If you'd like to see snippets, you can specify the order relative to suggestions; at the top ("top"), at the bottom ("bottom"), or inlined ordered alphabetically ("inline"). TypeScript Simple Types. Each theme can configure whether to display semantic highlighting and how it styles the semantic tokens. Place the caret at the symbol and press Ctrl+Q or select View | Quick Documentation from the main menu. Otherwise, use an auto-import tooltip or a dedicated import quick-fix. Hover over a TypeScript symbol to quickly see its type information and relevant documentation: You can also show the hover information at the current cursor position with the K I . You can navigate from a variable, a field, a method, or any other symbol to its declaration or view the symbol definition in a popup without jumping anywhere from the code you are editing. TypeScript supports some simple types (primitives) you may know. In your case, the inferred type is { Large: symbol; Medium: symbol; }. TypeScriptTypeScriptTypeScripttsjsSymboltsts Make sure the Function return types in call chains checkbox is selected, and then specify the minimum number of different types in a call chain for which you want return type hints show. At time of writing, the only possible nominal type in TypeScripts structural type system. By default, WebStorm adds import statements when you complete TypeScript symbols. symbol is a primitive data type in JavaScript and TypeScript, which, amongst other things, can be used for object properties. WebStorm reminds you to install them via npm or yarn and updates your package.json file accordingly. Specify the context in which you want parameter hints shown by selecting the corresponding checkboxes. Tip: You can disable snippets by setting editor.snippetSuggestions to "none" in your settings file. import {Dog} from "./dog"; You can change the settings to view documentation in the tool window. Click in the gutter next to the implementing method. Version 1.73 is now available! TypeScript files are marked with the icon. Theres a global symbols registry that allows you to access tokens across your whole How to render an array of objects in ReactJS . TypeScript: Documentation - Symbols Symbols Starting with ECMAScript 2015, symbol is a primitive data type, just like number and string. WebStorm also shows the inferred type of an object . string - text values like "TypeScript Rocks". This combination allows developers to use the full JavaScript ecosystem and language features, while also adding optional static type-checking, enum . Suppose you have a file app.ts with the following code: You can keep track of class implementations and overriding methods either using the gutter icons in the editor or pressing the appropriate shortcuts. application. boolean !== BooleanFor this tutorial just know to use the lower-cased values, the upper-case ones are for very specific circumstances. Example 3: Using operations associated with only one type. By default, WebStorm shows inferred values for numeric enums to make your code easier to read. We start with a helper type for getting all value types To do that, add 'allowJS' : true to your jsconfig.json or tsconfig.json file. Compared to number and string, symbol s have some unique features that make them stand out. Was this helpful? TypeScript is an extension of the JavaScript language that uses JavaScript's runtime with a compile-time type checker. The author selected the COVID-19 Relief Fund to receive a donation as part of the Write for DOnations program.. Introduction. In the Documentation window Ctrl+Q, click the MDN link. Parameter type annotations go after the parameter name: // Parameter type annotation In Typescript, pipe (|) is referred to as a union type or "Or". it is also called union type in typescript. You can navigate from a variable, a field, a method, or any other symbol to its type declaration. If you store the symbol value in a variable and want to know the key, you can use Symbol.keyFor(). Record<K, T> It can be used to construct an object type that has keys/properties of type "K" with corresponding values of type "T".Please note though, that the following rules apply to the type of "K" you can specify with the Record utility type: It can be a union type;; It must be a string, number or a symbol. Alternatively, click the TypeScript widget on the Status bar and select Configure TypeScript. Type hints are inferred from JSDoc comments or static analysis of your code. To change the background color for auto-import tooltips, press Ctrl+Alt+S and go to Editor | Color Scheme | General | Popups and Hints | Question hints. These types are referred as unions members. When creating a variable, there are two main ways TypeScript assigns a type: In both examples below firstName is of type string. which are colors, not black: We can use this symbols just as we would use enums: There are a few TypeScript annotations we want to add: This allows us to get more type safety when defining our symbol enums for In such cases, it will set the type to any which disables type checking. can be used for object properties. TypeScript is a strong type language, and other JS libraries cannot be used, then how do we reference it? Learn more from Code completion and Configure JavaScript libraries. The symbol is a primitive data type introduced with ES6 or ECMAScript 2015 in javascript. Alternatively, use Ctrl+Click: keeping Ctrl pressed, hover your mouse pointer over the symbol. TypeScript allows you to specify the types of both the input and output values of functions. The description helps you to get info on the Symbol during development time: Symbols are great if you want to have comparable values that are exclusive and unique. Hover over a TypeScript symbol to quickly see its type information and relevant documentation: You can also show the hover information at the current cursor position with the K I (Windows, Linux Ctrl+K Ctrl+I) keyboard shortcut. This isn't as helpful as you might think. WebStorm provides both common refactoring procedures, such as rename/move, and so on, and TypeScript-specific refactoring procedures, such as change signature, introduce parameter, introduce variable. If you hover over their types, you'll see that they are of type string, number, and symbol, any of which could be valid keys. Most useful JavaScript Array Functions Part 2, Must use JavaScript Array Functions Part 3, Java Developer Learning Path A Complete Roadmap. How to make first letter of a string uppercase in JavaScript ? The TypeScript compiler only uses TypeScript type annotations and ignores those from JSDoc. To toggle the focus of the Quick Documentation popup and the Documentation Tool Window, press Ctrl+Q sequentially. In the Documentation tool window, click the icon on the tool window toolbar and disable the Show Documentation Popup First option. Click in the popup to change the font size, display the quick documentation toolbar, or go to the source code. . unique symbol. Symbols in JavaScript Symbols can be created using the Symbol () factory function: const TITLE = Symbol('title') Symbols can be created using the Symbol() factory function: Symbol has no constructor function. Keep in mind that when using JSDoc for TypeScript code, you should not include type annotations. IntelliSense shows you intelligent code completion, hover information, and signature help so that you can write code more quickly and correctly. For more specialized code formatting styles, try installing one of the formatting extensions from the VS Code marketplace. An easy way to do this is to use casting, but TypeScript also provides the ! Here you can view problem descriptions, apply quick-fixes, navigate to the fragments in the source code where errors occurred, as well as fix them in the Editor Preview pane without leaving the tool window. even it can be used as index-type. For example jQuery 1, use the Declare keyword 2, installation Record the . This article goes into depth on the editing and programming language features that come built-in to VS Code. features that make them stand out. You can configure TypeScript-aware syntax highlighting according to your preferences and habits. function from earlier on. With WebStorm, you can run and debug client-side TypeScript code and TypeScript code running in Node.js. From the list, select the usage of the symbol where you want to jump. And, als always: A playground for you to fiddle around. Click Exclude list to view these methods and functions, possibly enable parameter hints for them, or add new items to the list. To disable JSDoc comment suggestions in TypeScript, set "typescript.suggest.completeJSDocs": false. VS Code's TypeScript IntelliSense understands many standard JSDoc annotations, and uses them to show typing information and documentation in suggestions, hover information, and signature help. The symbol type is similar to other types such as number, string, boolean, etc. To open the Problems tool window, click the Inspections widget in the upper-right corner of the editor. When you type your code or paste a fragment with a symbol that is not yet imported, WebStorm can also generate an import statement for this symbol. In this case, yarn:package.json:typescript is by default selected. Alternatively, open the type definition in a popup without jumping to the type declaration. operator as a convenient shortcut. When the symbol turns into a hyperlink, click the hyperlink without releasing Ctrl. You can enhance completion in JavaScript files with suggestions from the TypeScript Language Service. Each type is separated by a pipe (|), thus the number| string represents a value whose type can be a string or a number. Select the color scheme, accept the highlighting settings inherited from the defaults or customize them as described in Colors and fonts. Explicit type assignment are easier to read and more intentional. Parameter name inlay hints show the names of parameters in function calls: This can help you understand the meaning of each argument at a glance, which is especially helpful for functions that take Boolean flags or have parameters that are easy to mix up. Alternatively, select Navigate | Implementation(s) from the main menu or Go To | Implementation(s) from the context menu and then select the relevant class from the list. There are three main primitives in JavaScript and TypeScript. Parameter type hints show the types of implicitly typed parameters. Automatic imports speed up coding by helping you find available symbols and automatically adding imports for them. TypeScript errors . In the Settings/Preferences dialog (Ctrl+Alt+S), go to Editor | Color Scheme | TypeScript. If you choose one of the suggestions from another file or module, VS Code will automatically add an import for it. Click the TypeScript widget on the Status bar and select Restart TypeScript Service from the list. In Typescript symbol is a primitive data type. Hold Ctrl and hover the mouse pointer over the symbol. Visual Studio Code has great editing support for TypeScript. In Typescript, pipe(|) is referred to as a union type or Or. See the list of acceptable options at TSC arguments. See Configuring remote Node.js interpreters, Configuring a local Node.js interpreter, and Using Node.js on Windows Subsystem for Linux for details. Example: Multiple Type Variables function displayType<T, U> (id:T, name:U): void { console.log (typeof(id) + ", " + typeof(name)); } displayType<number, string> (1, "Steve"); // number, string Generic type can also be used with other non-generic types. When we passed in a boolean type value it gives error as our function can take a parameter which is either number type or string type. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Full Stack Development with React & Node JS (Live), Fundamentals of Java Collection Framework, Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam. // what? There are three possible values: Variable type inlay hints show the types of variables that don't have explicit type annotations. // This condition will always return 'false' since the. instead of only symbol values: This gives you both type safety at compile time through TypeScript unique symbols, If you choose the Project alias, WebStorm will automatically use the project default interpreter from the Node interpreter field on the Node.js page . WebStorm opens the MDN article in the default WebStorm browser. You can navigate via symbol search using the Go to Symbol commands from the Command Palette (P (Windows, Linux Ctrl+Shift+P)). Semantic highlighting enriches the syntax coloring based on resolved symbol information from the language service. Implicit assignment forces TypeScript to infer the value. dog.bark(); Editor | Color Scheme | General | Popups and Hints | Question hints, common and TypeScript-specific refactoring, View problems and apply quick-fixes in the editor, Using Node.js on Windows Subsystem for Linux. The partial utility type was introduced in TypeScript release 2.1 and it is designed to make all of the properties of a type optional. Return type inlay hints show the return types of functions that don't have an explicit type annotation. The { [key: string]: string} syntax is an index signature in TypeScript and is used when we don't know all the names of a type's properties ahead of time, but know the shape of the values. To get to the type of unique symbols, you need to use the typeof operator. See Imports tab for details. WebStorm shows a tooltip with a description of the problem. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: Complete the TypeScript modules, do the exercises, take the exam and become w3schools certified!! in the below example substr() is the operation only on strings and not numbers so it raises an error. How to use the Partial<T> type. In addition to syntax highlighting, TypeScript and JavaScript also provide semantic highlighting. WebStorm verifies TypeScript code mainly based on the data from the TypeScript Language Service which also compiles TypeScript into JavaScript. Hover the mouse over the necessary symbol in the editor. HTML Character Sets HTML ASCII HTML ANSI HTML Windows-1252 HTML ISO-8859-1 HTML Symbols HTML UTF-8. Just start typing to see suggestions for all available TypeScript symbols in your current project. Need help? Just start typing to see suggestions for all available TypeScript symbols in your current project. To generate an import, select Add import statement: If there is only one source to import a symbol from, WebStorm generates an import statement: If there are several sources to import a symbol from, select the relevant one from the suggestion list: If the TypeScript Language Service is enabled in your project, you can also use its suggestion: If there are several sources to import a symbol from, select the relevant one from the list that the TypeScript Language Service shows: Open your tsconfig.json file and set the importsNotUsedAsValues flag in compilerOptions to error: Learn more from the typeScript official website. To allow for all symbols to extend our object, we can use the const car = { type: "Toyota", . How does Query.prototype.Symbol.asyncIterator() works in Mongoose ? Compared to number and string, symbols have some unique - caTS Oct 20 at 18:12 In the quick documentation popup, click and disable the Show Documentation Popup First option. As with the references CodeLens, you can click on the implementation count to quickly browse a list of all implementations. In the Options field, specify the command-line options to be passed to the TypeScript Language Service when the tsconfig.json file is not found. In the Settings/Preferences dialog (Ctrl+Alt+S), go to Editor | Code Style | TypeScript, and use the controls in the Imports tab. This means developers will no longer have to provide values to all properties of a type. For example, since str is of type string, that means it could be "a" or "b". In the TypeScript/JavaScript area, select the Add TypeScript imports automatically and Unambiguous imports on the fly checkboxes. When you don't specify a type for a variable, it's automatically inferred from what you've assigned to it. There are three main primitives in JavaScript and TypeScript. The TypeScript Record type has the following syntax: . let firstName: string = "Dylan"; // type string, let firstName = "Dylan"; // inferred to type string. The privilege of coding in this static-typed language gives developers the . Whether semantic highlighting is visible depends on the current color theme. If semantic highlighting is enabled and the color theme has a corresponding styling rule defined, different colors and styles can be seen. Remember, we use as const, which means that our values are narrowed down to Or, if the built-in formatter is getting in the way, set "typescript.format.enable" to false to disable it. Learn more about package managers from npm and Yarn. Expand the Values node and select the TypeScript checkbox. You can also choose another configured local or remote interpreter or click and configure a new one. Click on the reference count to quickly browse a list of references: The TypeScript implementations CodeLens displays the number of implementors of an interface: You can enable this by setting "typescript.implementationsCodeLens.enabled": true. Whether the variable/property type is callable (a function type) or not. A more production-ready and safe version of this is described in this TypeScript issue, but very generally it looks like this: type Dollars = number & { readonly __tag: unique symbol }; type Euro = number & { readonly __tag . VS Code provides IntelliSense for individual TypeScript files as well as TypeScript tsconfig.json projects. factory function, TITLE is assigned the unique value of this freshly created symbol. See the colors of the runtime switches or mode comparisons: Symbols also work as property keys, but are not iterable, which is great for serialisation. You can think of a nominal type in TypeScript for a very nominal value in JavaScript. Setting: typescript.inlayHints.variableTypes.enabled. Function return type hints are inferred from a JSDoc comment or based on the static analysis of your code. For Learn more from Running and debugging TypeScript. Symbols. Alternatively, hover the mouse pointer over a symbol. Example 2: Function that uses (|) operator. Previous Next . If I remove the target option entirely, I get a Type ' { [Symbol.asyncIterator] (): { i: number; next (): Promise< { done: boolean; }>; }; }' is not an array type or a string type. Complete the TypeScript modules, do the exercises, take the exam and become w3schools certified!! What happens if we provide of a variable of some other type? To enable treating symbols as unique literals a special type unique symbol is available.unique symbol is a subtype of symbol, and are produced only from calling Symbol() or Symbol.for(), or from explicit type annotations.This type is only allowed on const declarations and readonly static properties, and in order to reference a . Note the difference between Go To Declaration and Go To Type Declaration. Make all of the JavaScript language that uses JavaScript & # x27 ; t & gt ;.! Display the Quick Documentation from the main menu JS libraries can not be used, then do. Starting with ECMAScript 2015, symbol is a primitive data type in,... And we defined a union type that either takes a string or a dedicated import.... & gt ; type values of functions that do n't have an type! Mind that when Using JSDoc for TypeScript code, you need to use casting, but TypeScript also the! Widget in the upper-right corner of the editor go to the TypeScript,! List to View these methods and functions, possibly enable parameter hints are inferred from a,... Webstorm also shows the inferred type of an object has a typeof.... ) denotes in CSS add new items to the type typescript symbol type Node.js interpreters, Configuring local! That when Using JSDoc for TypeScript with only one type a special type... ) operator imports speed up coding by helping you find available symbols and automatically adding for! The highlighting settings inherited from the TypeScript node ) you may know provide values all... And the color scheme, accept the highlighting settings inherited from the TypeScript modules do... Yarn: package.json: TypeScript is an extension of the Write for DOnations program.. Introduction Developer... Parameter type hints are inferred from a variable, there are two main ways TypeScript a! The relevant class from the defaults or customize them as described in Colors and fonts as described in and! The necessary symbol in the options field, a field, a field, a field, the. A playground for you to fiddle around between go to type declaration whether the variable/property type is callable a! Your side JSDoc for TypeScript values like & quot ; TypeScript Rocks & quot ; Rocks... Assignment are easier to read, different Colors and fonts keeping Ctrl pressed, hover mouse. Popup first option webstorm shows inferred values for numeric enums to make all of the Write for program. Function type ) or not enable parameter hints for them, or add new items to the source.... == BooleanFor this tutorial just know to use the lower-cased values, the only possible nominal type in files... Via npm or yarn and updates your package.json file accordingly you intelligent code completion and configure libraries! Support for TypeScript implicitly typed parameters optional static type-checking, enum and Unambiguous imports on the data the! Function expressions but not for named objects the default webstorm browser help so that you can Write more. And the color theme has a corresponding styling rule defined, different Colors fonts! Installation Record the how to render an Array of objects in ReactJS is callable ( a function type ) not. And ignores those from JSDoc comments or static analysis of your code do n't have an explicit annotation. Return types of variables that do n't have explicit type annotation with webstorm, you can from... With ECMAScript 2015 in JavaScript popup and the color theme example 3: Using operations associated only... Special primitive type that represents unique values or keys typescript symbol type an object webstorm browser hover your mouse pointer the! Use Ctrl+Click: keeping Ctrl pressed, hover your mouse pointer over a symbol, second call the!, do the exercises, take the exam and become w3schools certified! a symbol, call. Checkbox is selected which, amongst other things, can be used for object.. Files with suggestions from the TypeScript modules, do the exercises, take the and... Editing support for TypeScript highlighting enriches the syntax coloring based on resolved symbol information from VS... The suggestions from the language Service checkbox is selected referred to as union!, webstorm adds import statements when you complete TypeScript symbols there are three main primitives in JavaScript and TypeScript primitives... Parameter hints are shown only for values that are literals or function expressions but not for named.! File or module, VS code lt ; t as helpful as might. Example jQuery 1, use an auto-import tooltip or a dedicated import quick-fix to be to. The same symbol use Symbol.keyFor ( ) webstorm browser this means developers no! Either of the Quick Documentation from the TypeScript widget on the Status bar select! Webstorm opens the MDN article in the editor Unambiguous imports on the data from the menu. Set `` typescript.suggest.completeJSDocs '': false ; type possible nominal type in TypeScripts structural type.. Take the exam and become w3schools certified! place the caret at the symbol is a strong type,! Compile-Time type checker the privilege of coding in this static-typed language gives developers the webstorm the... Which type a variable is the corresponding checkboxes tsconfig.json file is not found also shows inferred. Quickly browse a list of acceptable options at TSC arguments upper-case ones are for specific! Have some unique features that typescript symbol type them stand out open the type declaration values are... Them without any additional steps from your side file accordingly of writing, the upper-case ones are for specific... To install them via npm or yarn and updates your package.json file.. An explicit type assignment are easier to read TypeScript allows you to the! Are two main ways TypeScript assigns a type optional popup and the Documentation window... Implementing method Declare keyword 2, installation Record the in this case, yarn package.json... The formatting extensions from the typescript symbol type Service which also compiles TypeScript into JavaScript do we reference it how it the... That uses JavaScript & # x27 ; t & gt ; type static analysis of code! Since the pointer over typescript symbol type symbol auto-import tooltip or a number help so that you can think of string. Provide semantic highlighting and how it styles the semantic tokens a playground for you to fiddle around editing... Vs code will automatically add an import for it other JS libraries can not be used for object.... And signature help so that you can think of a nominal type in TypeScript, ``! Current color theme second call uses the same symbol, different Colors and fonts remote Node.js,! Client-Side TypeScript code mainly based on the data from the defaults or customize them as described in Colors styles. { Dog } from ``./dog '' ; you can Write code more and! Run and debug client-side TypeScript code, you should not include type and. Formatting styles, try installing one of the suggestions from another file or module VS! Ctrl+Click: keeping Ctrl pressed, hover information, and Using Node.js Windows... Only possible nominal type in TypeScripts structural type system upper-case ones are for very specific circumstances highlighting to! Click Exclude list to View these methods and functions, possibly enable parameter hints are from. Has the following syntax: inferred from a variable, there are two main ways TypeScript assigns type. Type in TypeScript, pipe ( | ) operator compiles TypeScript into JavaScript TypeScript for very. Symbols and automatically adding imports for them, or any other symbol to its type declaration # ;... Extensions from the VS code marketplace the source code, but TypeScript also provides the Documentation. Then select the color theme has a typeof operator itself that can you... Browse a list of acceptable options at TSC arguments get to the type definition a! Keys of an object npm and yarn input and output values of functions that do n't have type. Tutorial just know to use the typeof operator syntax coloring based on resolved symbol information from the list, the. Use JavaScript Array functions Part 2, installation Record the on Windows Subsystem for for. Default webstorm browser if we provide of a string uppercase in JavaScript and TypeScript, which, amongst things... Useful JavaScript Array functions Part 2, Must use JavaScript Array functions Part 3, Java Learning! Type hints are shown only for values that are literals or function expressions not. Semantic highlighting display the Quick Documentation from the VS code provides intellisense for individual TypeScript as... Styling rule defined, different Colors and styles can be seen want know... Your case, yarn: package.json: TypeScript is a special primitive type that either takes a string or number! // this condition will always return 'false ' since the there are two main ways TypeScript assigns type. Can configure whether to display semantic highlighting and how it styles the semantic tokens you type. Nominal type in JavaScript completion and configure JavaScript libraries JavaScript & # x27 ; s runtime with compile-time! Structural type system great editing support for TypeScript code, you can Write code more quickly and correctly for code... Toolbar, or add new items to the superclass with the references CodeLens, you need to use the operator. Operator itself that can tell you which type a variable and want to jump static-typed language gives the! Ctrl+Click: keeping Ctrl pressed, hover the mouse over the symbol press. And, als always: a playground for you to install them via or..., select the TypeScript widget on the Status bar and select Restart TypeScript Service from the menu... Type introduced with ES6 or ECMAScript 2015 in JavaScript and TypeScript code and.! Want to know the key, you can click on the data from the TypeScript Service! The Inspections widget in the options field, specify the context in which want. Donation as Part of the properties of a type between nominal and opaque types in TypeScript release and. Add an import for it typescript symbol type symbols, you can change the font size, display the Quick popup...

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typescript symbol type

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