Class Env<T, StringEnvs, IntegerEnvs, BooleanEnvs>

Reads a boolean environment variable. Only the exact string "1" is true. Every other value is false, including "true", "TRUE", "yes" and "", and so is an unset variable.

// FEATURE_FLAG=1
AppEnv.boolean('FEATURE_FLAG') // true

// FEATURE_FLAG=true
AppEnv.boolean('FEATURE_FLAG') // false
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Sets a boolean environment variable to "1", the only value Env.boolean reads as true.

Deletes a boolean environment variable. Env.boolean reads an unset variable as false, since only the exact string "1" is true.