v4.0.0

Major Changes

• #33 39cf365 Thanks @rexxars! - Require Node.js 22.12 or higher, drop the CommonJS build, and discard invalid lines instead of buffering them

  Breaking changes

  • Node.js 18 and 20 are no longer supported. engines now requires >=22.12, and the browserslist target moved from node >= 18 to node >= 22.12. Older versions may keep working, but they are no longer tested or guaranteed.
  • The CommonJS build has been removed. The main field and the require export conditions are gone, so the package resolves to ./dist/index.js and ./dist/stream.js only. Node 22.12 and above supports require(esm) transparently, so require('eventsource-parser') continues to work there.
  • The root stream.js file has been removed. It re-exported ./dist/stream.cjs for React Native and other bundlers without package exports support. Import eventsource-parser/stream instead, and make sure your bundler resolves the exports field.
  • Invalid lines are now discarded as soon as the parser can tell they cannot become a valid SSE field, rather than being buffered until the line terminator arrives. onError is not called for these, and no line, field, or value is retained. Only lines that are complete when found to be invalid still produce a ParseError with type: 'unknown-field'. This also means reset({consume: true}) no longer reports pending data that was already discarded.
  • Partial comment lines (starting with :) are only buffered when an onComment callback is configured. Without one, they are discarded like any other line the parser has no use for.

  Other changes

  • A leading byte order mark is now stripped whether it arrives as a decoded U+FEFF (for example from a TextDecoder created with ignoreBOM) or as the raw three byte 0xEF 0xBB 0xBF sequence. Previously only the raw form was handled.
  • The README documented an invalid-field error type that the parser never emitted. The ErrorType union is unchanged; the documentation now correctly refers to unknown-field.