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torch.ValidatedEinsumShape

export type ValidatedEinsumShape<E extends string, Shapes extends readonly Shape[]> =
  // Step 1: Check if validation failed (returned an error type)
  ValidateEinsum<E, Shapes> extends { readonly __isShapeError: true }
    ? // Validation failed: extract and return the error type
      ValidateEinsum<E, Shapes> & readonly number[]
    : // Validation passed: return the output shape
      EinsumOutputShape<E, Shapes> & readonly number[];

Eextends string

Shapesextends readonly Shape[]

Validated einsum output shape.

This type is designed to:

Return error types that show clearly in TypeScript error messages
Return output shapes that preserve exact dimensions
Always satisfy the Shape constraint (readonly number[])

When validation fails, returns an error shape like einsum_error_operand_count_mismatch. When validation passes, returns the computed output shape.

The intersection with readonly number[] ensures TypeScript knows the result is always a valid Shape, while the branded properties on error types still cause assignability errors that show the error type name.

ValidateChunkDim