Function expectToBeNonNull

  • expectToBeNonNull<T>(arg: T): asserts arg is Exclude<T, null>

  • Equivalent to calling vitest.expect(arg).not.toBeNull() while also asserting arg to non-null.

    Type Parameters

    • T

      The type of arg.

    Parameters

    • arg: T

      The variable to be asserted.

    Returns asserts arg is Exclude<T, null>

    undefined.

    Assert

    arg is not null.

    Example

    const iAmNotNull: number | null = Math.random() < 1 ? 10 : null;
    expectToBeDefined(iAmNotNull);
    expect(iAmNotNull + 1).toBe(11);

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