Function createFieldDefinition

createFieldDefinition<FD extends FieldDefinition>(
    messageDef: MessageDefinition<FD>,
): {
    createNewMessage: (mti: number) => Message<FD>;
    fields: FD;
    mtiField: Field<number>;
    parse: (iso: Buffer) => Message<FD>;
    prepare: (message: Message<FD>) => Buffer<ArrayBufferLike>;
}
Create a MessageDefinition object while coercing it's type
Type Parameters
- FD extends FieldDefinition
Parameters
- messageDef: MessageDefinition<FD>
  an object that define the fields of the ISO message. It's type will be used as the base to type the result of this function and provide type safety
Returns {
    createNewMessage: (mti: number) => Message<FD>;
    fields: FD;
    mtiField: Field<number>;
    parse: (iso: Buffer) => Message<FD>;
    prepare: (message: Message<FD>) => Buffer<ArrayBufferLike>;
}
a strongly typed message definition
Example
```
const IsoDefinition = createFieldDefinition({"2": {name: "PAN", field: AN({length: 19})}});
```
- Defined in lib/message.ts:160