Json Schema doesn't support additionalProperties as expected

[madhavmurthy93]

The definition of additional properties is:
The additionalProperties keyword is used to control the handling of extra stuff, that is, properties whose names are not listed in the properties keyword. By default any additional properties are allowed.

The additionalProperties keyword may be either a boolean or an object. If additionalProperties is a boolean and set to false, no additional properties will be allowed.

If additionalProperties is an object, that object is a schema that will be used to validate any additional properties not listed in properties.

Reference: https://json-schema.org/understanding-json-schema/reference/object.html#properties

When I try to use it as described above:

capabilityValues: {
    type: JsonSchemaType.OBJECT,
    additionalProperties: {
        type: [JsonSchemaType.STRING, JsonSchemaType.NUMBER, JsonSchemaType.BOOLEAN]
    }
}

I get the following error

error TS2322: Type '{ type: JsonSchemaType[]; }' is not assignable to type 'boolean | undefined'.
  Type '{ type: JsonSchemaType[]; }' is not assignable to type 'true'.

91                                 additionalProperties: {
                                   ~~~~~~~~~~~~~~~~~~~~

Code reference:

aws-cdk/packages/@aws-cdk/aws-apigateway/lib/json-schema.ts

Line 66 in 613df1b

readonly additionalProperties?: boolean;

[nija-at]

Re-classifying this as a bug.

[nikolajwestergaard]

Any reason why was supporting JsonSchema as additionalProperties removed in september 2019? See: #3997
Using additionalProperties seems to be part of the Json Schema standard and part of the Swagger / OpenAPI standard (https://swagger.io/docs/specification/data-models/dictionaries/).
It's pretty importing if the serving of dictionaries or indexes of complex data.

[madhavmurthy93]

@nikolajwestergaard yes definitely important for defining dictionaries and we need support for that right now. @nija-at any update on when this will get worked on?