Function optionalObjectKeyParser

editor/src/utils/value-parser-utils.ts:249–266

(
  parser: (v: unknown, k: string) => ParseResult<V>,
  key: string,
)

// Parses a single key out of an object, returning
// undefined if the key doesn't exist.
export function optionalObjectKeyParser<V>(
  parser: (v: unknown, k: string) => ParseResult<V>,
  key: string,
): (v: unknown) => ParseResult<V | undefined> {
  return (value: unknown) => {
    if (typeof value === 'object' && !Array.isArray(value) && value != null) {
      const withErrorParser = objectValueParserWithError(parser)
      const valueAsObject: any = value
      if (key in valueAsObject) {
        return withErrorParser(valueAsObject[key], key)
      } else {
        return right(undefined)
      }
    } else {
      return left(descriptionParseError('Not an object.'))
    }
  }
}

export function parseObject<V>(
  objectValueParser: (v: unknown, key: string) => ParseResult<V>,