Function defaultLeafHook

packages/effect/src/SchemaIssue.ts:912–939

(issue)

 * @since 4.0.0
 */
export const defaultLeafHook: LeafHook = (issue): string => {
  const message = findMessage(issue)
  if (message !== undefined) return message
  switch (issue._tag) {
    case "InvalidType":
      return getExpectedMessage(InternalAnnotations.getExpected(issue.ast), issue)
    case "InvalidValue": {
      const expected = findExpected(issue)
      if (expected !== undefined) return getExpectedMessage(expected, issue)
      const input = formatInput(issue)
      return input === undefined ? "Expected a valid value" : `Invalid data ${input}`
    }
    case "MissingKey":
      return "Missing key"
    case "UnexpectedKey": {
      const input = formatInput(issue)
      return input === undefined ? "Expected no excess property" : `Unexpected key with value ${input}`
    }
    case "Forbidden":
      return "Forbidden operation"
    case "OneOf": {
      const input = formatInput(issue)
      return input === undefined
        ? "Expected exactly one member to match"
        : `Expected exactly one member to match the input ${input}`
    }
  }
}

/**
 * Callback type used to format {@link Filter} issues into strings.