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@scaleleap/config
Advanced tools
Extendable configuration base class for 12 Factor application.
npm i @scaleleap/config
// in ./src/config.ts
import { BaseConfig } from '@scaleleap/config'
class Config extends BaseConfig {
public readonly TEST = this.get('TEST').asString()
}
// in ./src/app.ts
const config = new Config()
console.log(config.TEST)
Parent Config
class exposes a single protected method get
, which maps to
env-var#get method.
The constructor accepts a single argument, which is an dictionary of key-value strings, that
represents the environment. The value defaults to
process.env
.
This is useful, when you'd like to override the values for testing:
const config = new Config({ NODE_ENV: '...' })
This module will automatically read .env
file contents from $PWD/.env
.
You can influence the discovery path of .env
file via DOTENV_CONFIG_PATH
environment variable.
E.g.
DOTENV_CONFIG_PATH=.env.prod node foo.js
Sometimes it is desirable to scope all of the environment variables. This can be achieved through a prefix.
Example:
class Config extends BaseConfig {
protected readonly prefix = 'FOO_'
public readonly TEST = this.get('TEST').asString()
}
Will then look for environment variable named FOO_TEST
instead of just TEST
.
Note: The underscore _
character is not included by default and must be part of your prefix.
Be careful when working with built-in variables, as they would not be discovered, because of the prefix.
It is possible to expand variables:
FOO=bar
BAZ=${FOO}-baz
When the BAZ
value is expanded, the result will be:
FOO=bar
BAZ=bar-baz
There are some universal variables that are included into the config.
For now, there is just one.
NODE_ENV
Valid values are:
development
test
production
Example:
NODE_ENV=production node foo.js
Also comes with convenience boolean assertion getters:
isDevelopment
isTest
isProduction
Example:
const config = new Config()
if (config.isDevelopment) {
// do something destructive
}
NODE_ENV
.readonly
.asBoolStrict
not asBool
.MIT © Scale Leap
FAQs
Extendable configuration base class for 12 Factor application.
The npm package @scaleleap/config receives a total of 9 weekly downloads. As such, @scaleleap/config popularity was classified as not popular.
We found that @scaleleap/config demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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