mongodb-js / devtools-shared / 28812441817

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Pull #817

github

feat(mongodb-constants): add $$IDX system variable for MongoDB 8.3 MONGOSH-3244

Adds the $$IDX system variable introduced in MongoDB 8.3, which exposes
the index of the current element in $map, $filter, and $reduce expressions.
Users can use arrayIndexAs to assign a custom name instead.

Also adds an integration test verifying arrayIndexAs is suggested by the
TS-based autocompleter for all three operators. Note: $filter requires the
prefix 'arrayIn' rather than 'array' to avoid TypeScript resolving JavaScript
built-ins (Array, ArrayBuffer) ahead of the operator-specific field — a known
TypeScript inference limitation with $filter's recursive generic type.

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