CHANGELOG

2.0.1

This release adds support for esmodule imports (see #4).

This release improves the performance of parsing the response stream and fixes some corner cases to better match the spec.

The id, event, and data fields are now initialized to empty strings, per the spec (they were previously undefined)
The onmessage callback is now called for all messages (it was previously triggered only for messages with a data field)
If a message contains multiple data fields, they will be concatenated together into a single string. For example, the following message:
```
data: Foo
data:Bar
data
data: Baz
```
will result in { data: 'Foo\nBar\n\nBaz' }
If the server sends an id field with an empty value, the last-event-id header will no longer be sent on the next reconnect.

The internal parseStream function has been removed. The parse implementation was previously based on async generators, which required a lot of supporting code in both the typescript-generated polyfill as well as the javascript engine. The new implementation is based on simple callbacks, which should be much faster.

Updated examples in readme to fix typos, added more comments.
Changed if statements in parse.ts to test for specific values instead of truthy/falsy values.

Changed the default onOpen validator to allow charset and boundary directives in the content-type