Headers decoder with type checking (for express and fastify).
typia.http.isHeaders() is a function decoding an header instance, with
automatic type casting to the expected type. When property type be defined as
boolean or number type, typia.http.headers() will cast the value to the
expected type.
Also, after decoding, typia.http.isHeaders() performs type checking to the
decoded value by combining with is function. Therefore, when the
decoded value is not following the T type, null value would be returned.
By the way, as HTTP headers are not enough to express complex data structures,
typia.http.headers() function has some limitations. If target type T is not
following those restrictions, compilation errors would be occured.
Type T must be an object type
Do not allow dynamic property
Property key must be lower case
Property value cannot be null, but undefined is possible
Only boolean, bigint, number, string or their array types are allowed
Headers decoder with type checking (for express and fastify).
typia.http.isHeaders()is a function decoding an header instance, with automatic type casting to the expected type. When property type be defined asbooleanornumbertype,typia.http.headers()will cast the value to the expected type.Also, after decoding,
typia.http.isHeaders()performs type checking to the decoded value by combining with is function. Therefore, when the decoded value is not following theTtype,nullvalue would be returned.By the way, as HTTP headers are not enough to express complex data structures,
typia.http.headers()function has some limitations. If target typeTis not following those restrictions, compilation errors would be occured.Tmust be an object typenull, butundefinedis possibleboolean,bigint,number,stringor their array types are allowedset-cookiemust be array type