GeezerVison is showing github.com — feat: add undefinedAsNil option to Encoder by eberlitz · Pull Request #278 · msgpack/msgpack-javascript
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eberlitz
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Jun 12, 2025
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Closes #150
Adds a new option to Encoder that is true by default ( to keep current behaviour). With this flag when ignoreUndefined is false, allows to distinguish null from undefined. It requires a custom extension to send undefined like :
extensionCodec.register({
type: 0,
encode: (value) => (value === undefined ? new Uint8Array([0]) : null),
decode: () => undefined,
});
I also found another implementation (msgpackr) implements this as fixint 1 type 0 data 0, but I guess the consumer can decide in his custom extension
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