func os.LookupEnv

4 uses

	os (current package)
		env.go#L112: func LookupEnv(key string) (string, bool) {

	github.com/gotd/td/telegram
		builder.go#L25: 	dir, ok := os.LookupEnv("SESSION_DIR")
		builder.go#L49: 		sessionFile, ok := os.LookupEnv("SESSION_FILE")

	github.com/gotd/td/telegram/auth
		flow.go#L192: 	v, ok := os.LookupEnv(env)

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