[babel 8] ObjectTypeAnnotation fields must always be arrays
#14465
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JLHwung
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Apr 21, 2022
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Ok, I put all the changes behind the flag. Is there a document where all breaking changes/migrations steps are recorded? |
…are always present BREAKING CHANGE: The 2., 3., and 4. parameter to the builder for `ObjectTypeAnnotation` do not accept null anymore. Use undefined.
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Yes, see #10746. |
existentialism
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Apr 22, 2022
nicolo-ribaudo
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ObjectTypeAnnotation are always presentObjectTypeAnnotation fields must always be arrays
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@danez Even if something is not tracked in this issue (for example, this PR is a very small breaking change), we are marking all these changes with the same label so that we can go through them when preparing Babel 8. |
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Ok cool. |
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PR: Breaking Change 💥
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The fields
indexers,callProperties, andinternalSlotsin the nodeObjectTypeAnnotationare currently marked as optional. This is correct for the builder, they should be optional there.For the TS types, this is not quite correct, because the babel parser always initializes these fields with empty arrays (https://github.com/babel/babel/blob/main/packages/babel-parser/src/plugins/flow/index.js#L1085-L1088).
The only way to set these fields to null is with the builder currently.
The change here is to not mark these fields as optional but instead provide an empty array as a default value. This way the builder still has these params as optional, but cannot be set to
nullanymore.The Typescript types on the other hand now do not mark these fields as optional which is correct, as they are always an array, even if it might be empty.
Do you think this is a reasonable change?
Now, is this breaking? Only the builder might be considered as a breaking change, as it does not allownullanymore for these fields (see change generator tests). If you think this is breaking enough I could move that behind the BABEL8 flag. Please let me know.After thinking about this a little more I now think this should be considered breaking. Which Flag should I use?
BABEL_TYPES_8_BREAKINGorBABEL_8_BREAKING