I'm wondering what the scope of a module is in both browsers and Node. I'm specifically trying to understand whether a module-level variable is created once per app, or many times. Is a new instance of the module created on each import, or is it the exact same module shared across all imports? Many thanks!
In browsers + Node, what is the scope of a module?
186 Views Asked by Switch386 At
1
There are 1 best solutions below
Related Questions in JAVASCRIPT
- Angular Show All When No Filter Is Supplied
- Why does a function show up as not defined
- I count the time the user takes to solve my quiz using Javascript but I want the same time displayed on another page
- Set "More" "Less" font size
- Using pagination on a table in AngularJS
- How to sort these using Javascript or Jquery Most effectively
- how to fill out the table with next values in array with one button
- State with different subviews
- Ajax jQuery firing multiple time display event for the same result
- Getting and passing MVC Model data to AngularJS controller
- Disable variable in eval
- javascript nested loops waiting for user input
- .hover() seems to overwrite .click()
- How to sort a multi-dimensional array by the second array in descending order?
- How do I find the fonts that are not loading in a CORS situation ( MoovWeb )?
Related Questions in NODE.JS
- How to solve CERT_UNTRUSTED error in nodemailer
- Run a loop over a callback, node js
- Implementing prerender.io middleware in sails.js
- Token based authorization in nodejs/ExpressJs and Angular(Single Page Application)
- formatting path string in javascript
- One to One screensharing using WEBRTC
- Create polygon from grid (for collisions)
- Strange npm behavior when installing packages like grunt
- Convert JSON.gz to JSON in node js
- "Your npm version is outdated." but it's not. While install yo
- Why put methods on the prototype of a class instead of declaring them in the constructor?
- Node JS Async Response
- mongoose get property from nested schema after `group`
- Cannot Receive Incoming call on Twilio android Client
- How can I change a specific line in a file with node js?
Related Questions in ECMASCRIPT-6
- React, ES6 - getInitialState was defined on a plain JavaScript class
- jspm does not transpile code from ES6 to ES5
- XHR progress event microtask queue
- Compiling ES6 arrow functions to Es5 using Babel.js
- How to properly bind current object context in ES6 using babelify
- Mixins for ES6 classes, transpiled with babel
- How do I support jasmine and es6 syntax in Visual studio Code?
- can es6 class have public properties as well as functions?
- is there any way to obtain a reference to (and use) an es6/2015 import in the same expression?
- ES6 classes with Angular 1 DI issue with $inject
- Recursive Tree Walk with ES6 Promise
- Do I have to call super.componentDidUpdate in React?
- How to check if a variable is an ES6 class declaration?
- The this-variable is the Window object or undefined in the then-method of a promise
- Webstorm: Debugging Mocha tests written in ES6
Related Questions in NODE-MODULES
- How to use preinstalled node modules from laravel-elixir in Laravel 5
- Using the shell provided with NodeJS
- How to determine what min/max node version my node app supports based on my dependencies
- scope of "this" in module.exports
- Why are npm install && npm install <pack-name> both required?
- How to reference node modules in AngularJs file
- NodeJS server side application deployment cosiderations
- What will be the flow of execution in this node.js code?
- How to read value from JSON object?
- Export NativeModules for NPM in React-Native
- Can you export multiple classes from a single Nodejs Module?
- Rendered HTML output using nodejs
- How can i import angular-2-local-storage in my angular 2 app (angular-cli)
- Electron + Angular2 - import modules
- how to install node modules for node app on public web server?
Related Questions in ECMA
- What is special about .NET primitive types?
- Do javascript numbers follow IEEE 754 double precision?
- Standard Data Types
- How to allow '@' keyword in Javascript
- get instance of load() function in nashorn
- Increment or decrement a value in react array while mapping
- In browsers + Node, what is the scope of a module?
- How to check object is present in JSON or not Using Javascript
- What does mean for loop with one semicolon?
- JS Regex for Parsing SGF (Meta)data
- JS string destructuring: rest parameter returning inconsistent data
- Is there a way to create local scope variable names from all of an object's properties without listing the property names?
- Validation rule for object like array
- When JS code from different sources (Scripts or Modules) must shares the same Realm object?
- @typescript-eslint/parser parserOptions.ecmaVersion ignored / not linting
Trending Questions
- UIImageView Frame Doesn't Reflect Constraints
- Is it possible to use adb commands to click on a view by finding its ID?
- How to create a new web character symbol recognizable by html/javascript?
- Why isn't my CSS3 animation smooth in Google Chrome (but very smooth on other browsers)?
- Heap Gives Page Fault
- Connect ffmpeg to Visual Studio 2008
- Both Object- and ValueAnimator jumps when Duration is set above API LvL 24
- How to avoid default initialization of objects in std::vector?
- second argument of the command line arguments in a format other than char** argv or char* argv[]
- How to improve efficiency of algorithm which generates next lexicographic permutation?
- Navigating to the another actvity app getting crash in android
- How to read the particular message format in android and store in sqlite database?
- Resetting inventory status after order is cancelled
- Efficiently compute powers of X in SSE/AVX
- Insert into an external database using ajax and php : POST 500 (Internal Server Error)
Popular Questions
- How do I undo the most recent local commits in Git?
- How can I remove a specific item from an array in JavaScript?
- How do I delete a Git branch locally and remotely?
- Find all files containing a specific text (string) on Linux?
- How do I revert a Git repository to a previous commit?
- How do I create an HTML button that acts like a link?
- How do I check out a remote Git branch?
- How do I force "git pull" to overwrite local files?
- How do I list all files of a directory?
- How to check whether a string contains a substring in JavaScript?
- How do I redirect to another webpage?
- How can I iterate over rows in a Pandas DataFrame?
- How do I convert a String to an int in Java?
- Does Python have a string 'contains' substring method?
- How do I check if a string contains a specific word?
There are several JS module flavours - ESM, CommonJS, AMD. Their common trait is that they are evaluated once on first import, at least under normal circumstances. Doing the opposite would make them inefficient for sharing data.
Exporting class instance is a common way to share one instance across the application without making a class a singleton.
The ways that can make a module be evaluated multiple times (intentionally or not) include having many copies of a module, different filename case on import in case-insensitive system, the modification of Node module cache.