ErrorCode: "ALIAS_PROPS" | "BAD_ALIAS" | "BAD_DIRECTIVE" | "BAD_DQ_ESCAPE" | "BAD_INDENT" | "BAD_PROP_ORDER" | "BAD_SCALAR_START" | "BLOCK_AS_IMPLICIT_KEY" | "BLOCK_IN_FLOW" | "DUPLICATE_KEY" | "IMPOSSIBLE" | "KEY_OVER_1024_CHARS" | "MISSING_CHAR" | "MULTILINE_IMPLICIT_KEY" | "MULTIPLE_ANCHORS" | "MULTIPLE_DOCS" | "MULTIPLE_TAGS" | "TAB_AS_INDENT" | "TAG_RESOLVE_FAILED" | "UNEXPECTED_TOKEN"