Version 0.5.0

Add support for the new TypeScript compiler option exactOptionalPropertyTypes. This adds a new construct: ObjWithOptional which mark properties from its second argument as optional in the TypeScript sense. So you get prop?: type for them instead of prop: type | undefined or prop: type.

Optional is renamed to MaybeUndefined to avoid confusion.

Here is an example of the new ObjWithOptional:
```
 ObjWithOptional({
     a: NUMBER,
 }, {
     b: STRING
 })
 // This schema will typecheck values as:
 {
     a: number,
     b?: string
 }

 // If you want b to possibly be undefined you can do instead:
 ObjWithOptional({
     a: NUMBER,
 }, {
     b: MaybeUndefined(STRING)
 })
 // This will typecheck values as:
 {
     a: number,
     b?: string | undefined
 }
```
Note that this only works when the new flag is set to true. If the flag is set to false or if you use an older version of TypeScript then in both case the type will be:
```
{
    a: number,
    b?: string | undefined
}
```
typesafe-schema does not look whether the flag is set to true or not. This means that even though the compiler won't differentiate between the two cases this library will.

Version 0.4.9

Add MinLength helper to require a field to have a minimum length. Supported type are STRING, Arr(..) and Dict(..).

Version 0.4.8

Augment type limit for Enum and EnumObj to accept up to 8 values

Version 0.4.7

Render null as 'null'

Version 0.4.6

No API changes

Version 0.4.5

Add support for dictionaries: arbitrary keys with a validated type.

Version 0.4.4

Add TRUE and FALSE constant to allow narrowing a type with boolean values

Version 0.4.3

Fix a bug when an Obj is expected but a string is provided to the validate function. Error was TypeError: Cannot use 'in' operator to search for 'message' in "Not found";

Version 0.4.2

Remove coverage report from the npm package.

Version 0.4.1

Export ValidationSuccess, ValidationError and ValidationResult types.

Version 0.4.0

Instead of a function we now return an object with two properties:
- validator.validate(): A function that can validate objects.
- validator.schema: The original schema used by the validate function.

Version 0.3.0

Version 0.2 was fundamentaly broken, this release fix a number of issues:
- Possibility to constraint the resulting type
- Default it to TypeOf
- Add a test to make sure this is not broken in the future.

Version 0.2.3

Bug fix. Missing TypeOf in export.

Version 0.2.3

Bug fix. Missing Any in export.

Version 0.2.2

Add a strict argument to validators that reject value that have extra properties.

Version 0.2.0

Add a schema field to validators to reduce boilerplate when using composition
Rename defineSchema to newValidator, the original name was confusing

Version 0.1.1

Initial release.