Variable BaseDefinitions`Const`

BaseDefinitions: [
    BuiltInConstantDefinition<null>,
    BuiltInConstantDefinition<{ type: symbol }>,
    BuiltInConstantDefinition<number>,
    BuiltInConstantDefinition<{ type: symbol }>,
    BuiltInConstantDefinition<boolean>,
] = ...

The built-in definitions of the base package.