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I used a create-react-app.
And created environment variable files. .env.local, .env.development.local
I found that .env.development ispreferred over .env.local
And env.development.local seems to have prioty over .env.development.
If so, .env.development.local is used to override .env.development what is the purpose of .env.local?
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In . env. local you can set up environment variables that are specific to your local machine and it doesn't have to be on development mode to work, so variables there will work for both development and production .
Make sure you have the . env file in your root folder(same place where you have your package. json) and NOT in your src folder.
Using environment variables is a somewhat common practice during Development but it is actually not a healthy practice to use with Production. While there are several reasons for this, one of the main reasons is that using environment variables can cause unexpected persistence of variable values.
NEXT_PUBLIC is a new feature added. Before, in order to set up environment variables, we had to set up both for server and client. environment variables that are placed in the . env file would be available only on the server-side, if you want to make your env variables available at client-side you had to use next.
Local Environment variables maintain state only while the flow progresses (along a single propagated path). The Local Environment variables are available to all nodes on the same propagated path, but changes are only passed out of a Computenode if the ComputeMode property includes Local Environment.
For most circumstances, using local variables with the node is the optimal solution. This section covers the use of Local Environment to store the variables when more than a flat structure is required. All data that is stored in the Environment tree is stored in memory during the whole message flow, and is not freed after it is out of scope.
This section covers the use of Local Environment to store the variables when more than a flat structure is required. All data that is stored in the Environment tree is stored in memory during the whole message flow, and is not freed after it is out of scope.
In your project directory, check there is a file named .env.local. Now check, if there is also a file named .env. If there is a file named .env then, simply copy the content from .env.local and paste it in .env file. Otherwise, if there is no such file named .env then first create a file named .env.
Here's the priority of the files for the development build and the production build:
Dev.: (npm start): .env.development.local, .env.local, .env.development, .env
Prod.: (npm run build): .env.production.local, .env.local, .env.production, .env
If you ever want to use something in your local environment without being specific to the development build or the production build, you can add some variables to your .env.local file.
Source : https://create-react-app.dev/docs/adding-custom-environment-variables/#what-other-env-files-can-be-used
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In .env.local you can set up environment variables that are specific to your local machine and it doesn't have to be on development mode to work, so variables there will work for both development and production.
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