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?
130 Views Asked by Switch386 At
1
There are 1 best solutions below
Related Questions in JAVASCRIPT
- MAX and GROUP BY - SQL
- How to get maximum value from a column in a data.frame and get ALL records
- join 2 tables and get some columns from 1st table and max timestamp value from second table
- Excel with AND, IF, MAX
- SQL MAX expression Function
- MySQL Group By - Get row associated with max() amount
- Increase the maximum size of char array
- Postgresql : Check if the last number is the highest
- modelica: compute minimum/maximum of continuous variable over time
- exception is not coming with sql max function
Related Questions in NODE.JS
- MAX and GROUP BY - SQL
- How to get maximum value from a column in a data.frame and get ALL records
- join 2 tables and get some columns from 1st table and max timestamp value from second table
- Excel with AND, IF, MAX
- SQL MAX expression Function
- MySQL Group By - Get row associated with max() amount
- Increase the maximum size of char array
- Postgresql : Check if the last number is the highest
- modelica: compute minimum/maximum of continuous variable over time
- exception is not coming with sql max function
Related Questions in ECMASCRIPT-6
- MAX and GROUP BY - SQL
- How to get maximum value from a column in a data.frame and get ALL records
- join 2 tables and get some columns from 1st table and max timestamp value from second table
- Excel with AND, IF, MAX
- SQL MAX expression Function
- MySQL Group By - Get row associated with max() amount
- Increase the maximum size of char array
- Postgresql : Check if the last number is the highest
- modelica: compute minimum/maximum of continuous variable over time
- exception is not coming with sql max function
Related Questions in NODE-MODULES
- MAX and GROUP BY - SQL
- How to get maximum value from a column in a data.frame and get ALL records
- join 2 tables and get some columns from 1st table and max timestamp value from second table
- Excel with AND, IF, MAX
- SQL MAX expression Function
- MySQL Group By - Get row associated with max() amount
- Increase the maximum size of char array
- Postgresql : Check if the last number is the highest
- modelica: compute minimum/maximum of continuous variable over time
- exception is not coming with sql max function
Related Questions in ECMA
- MAX and GROUP BY - SQL
- How to get maximum value from a column in a data.frame and get ALL records
- join 2 tables and get some columns from 1st table and max timestamp value from second table
- Excel with AND, IF, MAX
- SQL MAX expression Function
- MySQL Group By - Get row associated with max() amount
- Increase the maximum size of char array
- Postgresql : Check if the last number is the highest
- modelica: compute minimum/maximum of continuous variable over time
- exception is not coming with sql max function
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 # Hahtags
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.