Function dotenvExpand

dotenvExpand(value: string | undefined, ref?: ProcessEnv): string | undefined
Recursively expands environment variables in a string. Variables may be presented with optional default as $VAR[:default] or ${VAR[:default]}. Unknown variables will expand to an empty string.
Parameters
- value: string | undefined
  The string to expand.
- ref: ProcessEnv = process.env
  The reference object to use for variable expansion.
Returns string | undefined
The expanded string.
Example
```
process.env.FOO = 'bar';
dotenvExpand('Hello $FOO'); // "Hello bar"
dotenvExpand('Hello $BAZ:world'); // "Hello world"
```
Remarks
The expansion is recursive. If a referenced variable itself contains references, those will also be expanded until a stable value is reached. Escaped references (e.g. \$FOO) are preserved as literals.
- Defined in src/dotenvExpand.ts:96