feat: generate literal types for booleans and numbers

[RinseV]

Status

READY

Description

Allows for the generation of literal types for booleans and numbers. Fixes #1509.

Todos

• Tests
• Documentation
• Changelog Entry (unreleased)

Steps to Test or Reproduce

Outline the steps to test or reproduce the PR here.

> git clone https://github.com/RinseV/orval.git

1. Install dependencies & build the package
2. Generate the default specification in the tests folder: yarn generate:default
3. The generated models will have the correct literal types

Notes

I didn't want to break the current functionality from #1326 where not specifying a type will generate it as a string literal. So, having only const without a type will still generate as a string. The same is true for a type of string. But if the type is either number, integer or boolean, the type will be generated as the literal value of const. This can result in invalid code (like specifying a property with type: number and const: value which will generate as property: value).

Comparison

Schema:

components:
  schemas:
    StringConst:
      type: object
      required:
        - value
        - valueWithoutType
        - valueNullable
      properties:
        value:
          type: string
          const: string
        valueWithoutType:
          const: string
        valueNullable:
          type:
            - string
            - 'null'
          const: string

Before

export type StringConst = {
  value: string;
  valueWithoutType: "string";
  valueNullable: "string" | null;
};

Now

export type StringConst = {
  value: "string";
  valueWithoutType: "string";
  valueNullable: "string" | null;
};