Do I need to rerun the build command for `runtimeConfig` items to reflect changes?
I have, for example:
will this be baked in at build time or read at runtime?
5 Replies
Hi @Felix. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
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Based on the knowledge sources provided, I can answer your question about
runtimeConfig in Nuxt.
The runtimeConfig values are not baked in at build time. They are designed to be overridden by environment variables at runtime. This means you don't need to rebuild your application when changing these values.
According to the Nuxt documentation on Runtime Config:
"Runtime config values are automatically replaced by matching environment variables at runtime."
However, there are two important points to note:
1. Your desired variables must be defined in your nuxt.config. This ensures that arbitrary environment variables are not exposed to your application code.
2. Only specially-named environment variables can override a runtime config property. These should be uppercase variables starting with NUXT_ which use _ to separate keys and case changes.
For your specific example:
This setup allows you to set the databaseUrl using an environment variable named NUXT_DATABASE_URL at runtime. You don't need to rebuild your application when changing this value.
It's important to note that setting the default of runtimeConfig values to differently named environment variables (as in your example with DATABASE_URL) will only work during build-time and will break on runtime. The documentation advises using environment variables that match the structure of your runtimeConfig object.
For more detailed information, you can refer to the Nuxt documentation on Runtime Config.
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@kapa.ai is it capable of transforming the env vars somehow? for example turn "true" into a JS boolean?
Let me check the knowledge base for you again. One moment! :books:
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Based on the knowledge sources provided, there isn't specific information about Nuxt's
runtimeConfig capability to automatically transform environment variables, such as converting a string "true" into a JavaScript boolean.
However, I can provide some relevant information based on what we know about runtimeConfig:
1. The Nuxt documentation on Runtime Config mentions that runtime config is serialized before being passed to Nitro (Nuxt's server engine). This suggests that the values are treated as simple serializable types.
2. The same documentation states: "This means that anything that cannot be serialized and then deserialized (such as functions, Sets, Maps, and so on), should not be set in your nuxt.config."
Given this information, it appears that Nuxt does not automatically transform environment variable values into different types. The values would likely be passed as strings, as is typical with environment variables.
If you need to transform environment variable values, you might need to do this manually in your application code after accessing the runtime config. For example:
However, to give a definitive answer about any built-in transformation capabilities, we would need more specific information from the Nuxt documentation or official sources, which is not present in the provided knowledge sources.
kapa.ai: You're right to ask about transforming environment variables in Nuxt's runtimeConfig. Based on the provided knowledge sources, there isn't specific information about Nuxt's ability to automatically transform environment variables like converting "true" to a JavaScript boolean.
The documentation mainly focuses on how runtimeConfig values can be overridden by environment variables at runtime, but it doesn't mention any built-in transformation capabilities.
From the Nuxt documentation on Runtime Config, we know that:
1. Runtime config is serialized before being passed to Nitro.
2. Anything that can't be serialized and deserialized (like functions, Sets, Maps) shouldn't be set in nuxt.config.
This suggests that the values are likely treated as simple serializable types, typically strings for environment variables.
If you need to transform environment variable values, you would probably need to do this manually in your application code after accessing the runtime config. For example:
To get a definitive answer about any built-in transformation capabilities, we would need more specific information from official Nuxt sources, which isn't present in the provided knowledge base. If this functionality is crucial for your project, you might want to check the latest Nuxt documentation or ask in the Nuxt community forums for the most up-to-date information.
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