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yaml breaking changes

Every breaking API change we have recorded in yaml on npm: 15 breaking changes in 2 versions. Below are its newest 2 versions, removals and renames first, each with its source.

Newest change March 21, 2026

On this page

2.8.3

8 breaking changes, first published March 21, 2026.

  • Removed Alias.__@NODE_TYPE@5236991
    Alias.__@NODE_TYPE@5236991 was removed in yaml 2.8.3 npmjs.com
  • Removed Pair.__@NODE_TYPE@5236991
    Pair.__@NODE_TYPE@5236991 was removed in yaml 2.8.3 npmjs.com
  • Removed Schema.__@MAP@5237127
    Schema.__@MAP@5237127 was removed in yaml 2.8.3 npmjs.com
  • Removed Schema.__@SCALAR@5237130
    Schema.__@SCALAR@5237130 was removed in yaml 2.8.3 npmjs.com
  • Removed Schema.__@SEQ@5237133
    Schema.__@SEQ@5237133 was removed in yaml 2.8.3 npmjs.com
  • Removed YAMLMap.__@NODE_TYPE@5236991
    YAMLMap.__@NODE_TYPE@5236991 was removed in yaml 2.8.3 npmjs.com
  • Signature changed ErrorCode
    Was type 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' |... npmjs.com
  • Signature changed ToStringOptions
    Was type ToStringOptions = {blockQuote?: boolean | 'folded' | 'literal'; collectionStyle?: 'any' | 'block' | 'flow'; commentString?: (comment: string) => string; defaultKeyType?: Scalar.Type | null; defaultStringType?: Scalar.Type... npmjs.com

2.8.2

7 breaking changes, first published November 30, 2025.

  • Removed Alias.__@NODE_TYPE@5234745
    Alias.__@NODE_TYPE@5234745 was removed in yaml 2.8.2 npmjs.com
  • Removed Pair.__@NODE_TYPE@5234745
    Pair.__@NODE_TYPE@5234745 was removed in yaml 2.8.2 npmjs.com
  • Removed Schema.__@MAP@5234881
    Schema.__@MAP@5234881 was removed in yaml 2.8.2 npmjs.com
  • Removed Schema.__@SCALAR@5234884
    Schema.__@SCALAR@5234884 was removed in yaml 2.8.2 npmjs.com
  • Removed Schema.__@SEQ@5234887
    Schema.__@SEQ@5234887 was removed in yaml 2.8.2 npmjs.com
  • Removed YAMLMap.__@NODE_TYPE@5234745
    YAMLMap.__@NODE_TYPE@5234745 was removed in yaml 2.8.2 npmjs.com
  • Behavior changed
    Negative zero is now written as -0 instead of 0, and empty map values no longer produce doubled newlines in the output. github.com

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