What is the best way to utilize the Moment.js TypeScript definition file in a website that already has moment.min.js integrated?

Question

What is the best way to utilize the Moment.js TypeScript definition file in a website that already has moment.min.js integrated?

Currently, I am in the process of transitioning a website to utilize TypeScript by converting one JavaScript file at a time. All pages on my site are already linked to moment.js, such as:

<script src="/scripts/moment.min.js"></script>

I have successfully added other TypeScript definition files using the following command:

npm install --save-dev @types/jquery

However, it seems that this approach may not be suitable for Moment.js. After running the above command with 'moment' instead of 'jquery', a readme file is downloaded indicating:

This is a stub types definition for Moment (https://github.com/moment/moment). Moment provides its own type definitions, so you don't need @types/moment installed!

As an alternative solution, I attempted to save the moment.d.ts file from its GitHub repository and reference it in the TypeScript file like this:

///<reference path="../../Scripts/typeDeclarations/moment.d.ts"/>
var now:any = moment.utc();

However, TypeScript issued a warning:

Cannot find the name 'moment'

typescript momentjs

Answer 1

Answer №1

Summary:

To simplify integration, download the moment.d.ts file from the Moment GitHub repository and remember to disable the final line.

 //export = moment;

I conducted a brief test project to confirm this method, and it proved successful for me.

Here is the project layout:

--
  |
  -typings/
     -moment/
       -moment.d.ts   <-- //export = moment; commented out
  -typescript/
     -main.ts
  -tsconfig.json

Both the typings and typescript directories are included in the compilation target, as they are not excluded in the tsconfig.json file shown below:

{
    "compilerOptions": {
        "target": "es5",
        "declaration": false,
        "noImplicitAny": true,
        "removeComments": true,
        "outDir": "dist",
        "jsx": "react",
        "sourceMap": true,
        "experimentalDecorators": true
    },
    "compileOnSave": true,
    "exclude": [
        "node_modules",
        "dist"
    ]
}

The main.ts file entails:

const now: moment.Moment = moment.utc();

This code compiles smoothly, with my IDE providing autocomplete functionality based on the definition file. (Avoid using ///<reference tags)

By eliminating the export statement at the end of the definition file, it transforms into an internally accessible yet globally recognized module declaration document.

Answer 2

Summary:

To simplify integration, download the moment.d.ts file from the Moment GitHub repository and remember to disable the final line.

 //export = moment;

I conducted a brief test project to confirm this method, and it proved successful for me.

Here is the project layout:

--
  |
  -typings/
     -moment/
       -moment.d.ts   <-- //export = moment; commented out
  -typescript/
     -main.ts
  -tsconfig.json

Both the typings and typescript directories are included in the compilation target, as they are not excluded in the tsconfig.json file shown below:

{
    "compilerOptions": {
        "target": "es5",
        "declaration": false,
        "noImplicitAny": true,
        "removeComments": true,
        "outDir": "dist",
        "jsx": "react",
        "sourceMap": true,
        "experimentalDecorators": true
    },
    "compileOnSave": true,
    "exclude": [
        "node_modules",
        "dist"
    ]
}

The main.ts file entails:

const now: moment.Moment = moment.utc();

This code compiles smoothly, with my IDE providing autocomplete functionality based on the definition file. (Avoid using ///<reference tags)

By eliminating the export statement at the end of the definition file, it transforms into an internally accessible yet globally recognized module declaration document.

Answer 3

Answer №2

To achieve this, you can create a unique typing by making a custom file, for example custom-typings/moment.d.ts:

export * from 'moment'
export as namespace moment

Then, add that folder to your tsconfig.json:

{
  include: [
    "custom-typings"
  ]
}

Answer 4

To achieve this, you can create a unique typing by making a custom file, for example custom-typings/moment.d.ts:

export * from 'moment'
export as namespace moment

Then, add that folder to your tsconfig.json:

{
  include: [
    "custom-typings"
  ]
}

Answer 5

Answer №3

Regrettably, the type declarations for momentjs are structured in a purely modular syntax. This is due to the prevalent use of npm for acquiring JavaScript packages nowadays, with module loaders like Webpack or Browserify used to bundle these npm modules into a format suitable for web browsers.

In your scenario, you are not utilizing modules but simply importing browser scripts in a global context. To accommodate this, the creators of the definition files should have crafted the definitions following UMD guidelines, which enable them to support both modular and global ambient usage.

Fortunately, it is quite straightforward for you to incorporate this into your version of the definitions. Just include the following line at the beginning of moment.d.ts

export as namespace moment;

By doing this, you essentially declare that when referencing moment.d.ts with a triple-slash directive, everything exported from the module will be accessible under a global namespace named 'moment'.

This implies that there should now be a global variable moment available in the global context, thereby resolving the issue of encountering a Cannot find the name 'moment' error.

Following these steps should suffice to address the matter at hand.

Answer 6

Regrettably, the type declarations for momentjs are structured in a purely modular syntax. This is due to the prevalent use of npm for acquiring JavaScript packages nowadays, with module loaders like Webpack or Browserify used to bundle these npm modules into a format suitable for web browsers.

In your scenario, you are not utilizing modules but simply importing browser scripts in a global context. To accommodate this, the creators of the definition files should have crafted the definitions following UMD guidelines, which enable them to support both modular and global ambient usage.

Fortunately, it is quite straightforward for you to incorporate this into your version of the definitions. Just include the following line at the beginning of moment.d.ts

export as namespace moment;

By doing this, you essentially declare that when referencing moment.d.ts with a triple-slash directive, everything exported from the module will be accessible under a global namespace named 'moment'.

This implies that there should now be a global variable moment available in the global context, thereby resolving the issue of encountering a Cannot find the name 'moment' error.

Following these steps should suffice to address the matter at hand.

Answer 7

Answer №4

Starting from version 2.13.0, Moment now comes with a typescript definition file included. If you are using this specific version, you can proceed as follows:

import * as moment from 'moment';


let currentDateTime = moment().format('LLLL');

Important Tip: In case you encounter issues while importing moment, consider adding

"allowSyntheticDefaultImports": true

to the compilerOptions inside your tsconfig.json file.

For detailed information, please check out the official documentation on this page.

Answer 8

Starting from version 2.13.0, Moment now comes with a typescript definition file included. If you are using this specific version, you can proceed as follows:

import * as moment from 'moment';


let currentDateTime = moment().format('LLLL');

Important Tip: In case you encounter issues while importing moment, consider adding

"allowSyntheticDefaultImports": true

to the compilerOptions inside your tsconfig.json file.

For detailed information, please check out the official documentation on this page.

Answer 9

Answer №5

@Samantha Jones
Please make a note that if you encounter any difficulties while importing moment, consider adding
"allowSyntheticDefaultImports": true
to the compilerOptions section in your tsconfig.json file.

👍 This works for version 2.29.4 however, the import statement should be as follows:

import moment from 'moment';

Answer 10

@Samantha Jones
Please make a note that if you encounter any difficulties while importing moment, consider adding
"allowSyntheticDefaultImports": true
to the compilerOptions section in your tsconfig.json file.

👍 This works for version 2.29.4 however, the import statement should be as follows:

import moment from 'moment';

What is the best way to utilize the Moment.js TypeScript definition file in a website that already has moment.min.js integrated?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Similar questions

The argument provided is a string type, which cannot be assigned to a parameter expecting an object with a 'results' property of type string

Is TypeScript's Structural Typing the exception to the rule?

Why isn't useEffect recognizing the variable change?

Steps for displaying a 404 page on a server-side rendered dynamic route following a client-side page transition

Error: The data received from the Axios GET request cannot be assigned to the parameter type of SetState

What is the best way to employ the pick function with optional types within nested TypeScript structures?

Anticipated the object to be a type of ScalarObservable, yet it turned out to be an

What is the correct way to use Observables in Angular to send an array from a Parent component to a Child

ngx-capture : Issue with capturing the entire page

What is the proper way to define the Typescript type of the return value from the dispatch function in a Redux application?

What is the best way to implement react-password-checklist with zod?

Building a single page web application using TypeScript and webpack - a step-by-step guide

Launching Node Application

Using node-fetch version 3.0.0 with jest results in a SyntaxError stating that import statements cannot be used outside a module

Unsteady movement of Three JS OrbitControls during rotation

Obtain a Spotify Token and showcase information in next.js

"Error message: Trying to import a component in Angular, but encountering a message stating that the component has no exported

Expanding the table to display additional rows using pagination in an Angular application

Show information from the state using React and Typescript

Can one generate an enum based on a specific type?