npm install env-vars```
var env = require('env-vars')
var pgPassword = env.string('PGPASS')
var pgPort = env.integer('PGPORT', 5552)
- string(key[, defaultValue]): Returns a string for the given key. Fallsback to theboolean(key[, defaultValue])
optional default value if the environment variable is not defined.
- : Returns a boolean environment variable for the given key.number(key[, defaultValue])
- : Returns a number environment variable for the given key.integer(key[, defaultValue])`: Returns an integer environment variable for the given key.
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