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"