Function isSingleStringType

packages/platform/src/HttpApiBuilder.ts:599–624

(ast: AST.AST, key?: PropertyKey)

}

function isSingleStringType(ast: AST.AST, key?: PropertyKey): boolean {
  switch (ast._tag) {
    case "StringKeyword":
    case "Literal":
    case "TemplateLiteral":
    case "Enums":
      return true
    case "TypeLiteral": {
      if (key !== undefined) {
        const ps = ast.propertySignatures.find((ps) => ps.name === key)
        return ps !== undefined
          ? isSingleStringType(ps.type, key)
          : ast.indexSignatures.some((is) => Schema.is(Schema.make(is.parameter))(key) && isSingleStringType(is.type))
      }
      return false
    }
    case "Union":
      return ast.types.some((type) => isSingleStringType(type, key))
    case "Suspend":
      return isSingleStringType(ast.f(), key)
    case "Refinement":
    case "Transformation":
      return isSingleStringType(ast.from, key)
  }
  return false
}

/**
 * Normalizes the url parameters so that if a key is expected to be an array,