error TS2339: Property 'split' does not exist on type 'string | string[]'. Property 'split' does not exist on type 'string[]'

Question

When I build my application I get. error TS2339: Property \'split\' does not exist on type \'string | string[]\'. Property \'split\' does not exist on type \'string[

Answer 1

Brian Ball's solution is working, another approach for handling this situation is square brackets [ ].

For instance

req.headers.authorization[split](//define your conditions here)

For exmaple:

req.headers.authorization[split](",")