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feat: support empty mapped types #1261

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merged 2 commits into from May 26, 2022
Merged

feat: support empty mapped types #1261

merged 2 commits into from May 26, 2022

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daanboer
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@daanboer daanboer commented May 24, 2022 •
edited by github-actions bot

Currently, types such as:

export type MappedNever = {
  [K in never]?: never;
};

and

export type MappedExclude = {
  [K in Exclude<"key", "key">]?: never;
};

Result in the respective errors :

Error: Unexpected key type "never" for type "{ [K in never]?: never }" (expected "UnionType" or "StringType")

and

Error: Unexpected key type "undefined" for type "{ [K in Exclude<"key", "key">]?: never }" (expected "UnionType" or "StringType")

Instead, both scenarios should result in an empty object. This change simply adds the needed clauses to handle these types in MappedTypeNodeParser.

Ideally, both cases are handled in a single clause, as the second example should be equal to the first (both result in a never key type). This is currently not the case, since resolving an empty union results in undefined instead of new NeverType(), as mentioned in #1154 (comment). However, properly propagating NeverType is hard as it results in regressions, e.g. see #650 (review). The second clause can probably be removed once these issues are solved.

Version

Published prerelease version: v1.1.0-next.5

Changelog

馃帀 This release contains work from new contributors! 馃帀

Thanks for all your work!

鉂わ笍 null@daanboer

鉂わ笍 null@filipomar

鉂わ笍 Remi Cattiau (@loopingz)

鉂わ笍 Hadrien Milano (@hmil)

馃殌 Enhancement

馃悰 Bug Fix

馃敥 Dependency Updates

Authors: 9

@domoritz
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Can you add a test case?

@daanboer
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I added two test cases, one for either example.

@domoritz domoritz merged commit 0b04c7d into vega:next May 26, 2022
@domoritz
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Thank you

@daanboer daanboer mentioned this pull request Aug 18, 2022
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This was referenced Sep 21, 2022
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馃殌 PR was released in v1.1.0 馃殌

@github-actions github-actions bot added released This issue/pull request has been released. and removed prerelease labels Sep 21, 2022
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@daanboer @domoritz