Env file support

Version:

The JSS CLI supports loading environment variables from .env files that can be used to populate environment variables.

Variables are loaded from .env files with the following priority:

.env.${NODE_ENV}.local.
.env.local, unless the value of NODE_ENV is "test".
.env.${NODE_ENV}.
.env.

The CLI automatically expands variables inside of your .env* files. This allows you to reference other values. If you are attempting to use a $ in a variable value, it needs to be escaped with a backslash \. For example:

PASSWORD=b

# becomes 'adminb'
EXPANDED=admin$PASSWORD

# becomes 'admin$PASSWORD'
ESCAPED=admin\$PASSWORD

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