tests/cases/conformance/types/spread/objectSpreadStrictNull.ts(9,9): error TS2322: Type '{ sn: string | number | undefined; }' is not assignable to type '{ sn: string | number; }'.
  Types of property 'sn' are incompatible.
    Type 'string | number | undefined' is not assignable to type 'string | number'.
      Type 'undefined' is not assignable to type 'string | number'.
tests/cases/conformance/types/spread/objectSpreadStrictNull.ts(10,9): error TS2322: Type '{ sn: string | number | undefined; }' is not assignable to type '{ sn: string | number; }'.
  Types of property 'sn' are incompatible.
    Type 'string | number | undefined' is not assignable to type 'string | number'.
      Type 'undefined' is not assignable to type 'string | number'.
tests/cases/conformance/types/spread/objectSpreadStrictNull.ts(14,9): error TS2322: Type '{ sn: number | undefined; }' is not assignable to type '{ sn: string | number; }'.
  Types of property 'sn' are incompatible.
    Type 'number | undefined' is not assignable to type 'string | number'.
      Type 'undefined' is not assignable to type 'string | number'.
tests/cases/conformance/types/spread/objectSpreadStrictNull.ts(15,9): error TS2322: Type '{ sn: number | undefined; }' is not assignable to type '{ sn: string | number; }'.
  Types of property 'sn' are incompatible.
    Type 'number | undefined' is not assignable to type 'string | number'.
      Type 'undefined' is not assignable to type 'string | number'.
tests/cases/conformance/types/spread/objectSpreadStrictNull.ts(18,9): error TS2322: Type '{ sn: string | number | undefined; }' is not assignable to type '{ sn: string | number | boolean; }'.
  Types of property 'sn' are incompatible.
    Type 'string | number | undefined' is not assignable to type 'string | number | boolean'.
      Type 'undefined' is not assignable to type 'string | number | boolean'.
tests/cases/conformance/types/spread/objectSpreadStrictNull.ts(28,7): error TS2322: Type '{ title: undefined; yearReleased: number; }' is not assignable to type 'Movie'.
  Types of property 'title' are incompatible.
    Type 'undefined' is not assignable to type 'string'.


==== tests/cases/conformance/types/spread/objectSpreadStrictNull.ts (6 errors) ====
    function f(
        definiteBoolean: { sn: boolean },
        definiteString: { sn: string },
        optionalString: { sn?: string },
        optionalNumber: { sn?: number },
        undefinedString: { sn: string | undefined },
        undefinedNumber: { sn: number | undefined }) {
        // optional
        let optionalUnionStops: { sn: string | number } = { ...definiteBoolean, ...definiteString, ...optionalNumber };
            ~~~~~~~~~~~~~~~~~~
!!! error TS2322: Type '{ sn: string | number | undefined; }' is not assignable to type '{ sn: string | number; }'.
!!! error TS2322:   Types of property 'sn' are incompatible.
!!! error TS2322:     Type 'string | number | undefined' is not assignable to type 'string | number'.
!!! error TS2322:       Type 'undefined' is not assignable to type 'string | number'.
        let optionalUnionDuplicates: { sn: string | number } = { ...definiteBoolean, ...definiteString, ...optionalString, ...optionalNumber };
            ~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2322: Type '{ sn: string | number | undefined; }' is not assignable to type '{ sn: string | number; }'.
!!! error TS2322:   Types of property 'sn' are incompatible.
!!! error TS2322:     Type 'string | number | undefined' is not assignable to type 'string | number'.
!!! error TS2322:       Type 'undefined' is not assignable to type 'string | number'.
        let allOptional: { sn?: string | number } = { ...optionalString, ...optionalNumber };
    
        // undefined
        let undefinedUnionStops: { sn: string | number } = { ...definiteBoolean, ...definiteString, ...undefinedNumber };
            ~~~~~~~~~~~~~~~~~~~
!!! error TS2322: Type '{ sn: number | undefined; }' is not assignable to type '{ sn: string | number; }'.
!!! error TS2322:   Types of property 'sn' are incompatible.
!!! error TS2322:     Type 'number | undefined' is not assignable to type 'string | number'.
!!! error TS2322:       Type 'undefined' is not assignable to type 'string | number'.
        let undefinedUnionDuplicates: { sn: string | number } = { ...definiteBoolean, ...definiteString, ...undefinedString, ...undefinedNumber };
            ~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2322: Type '{ sn: number | undefined; }' is not assignable to type '{ sn: string | number; }'.
!!! error TS2322:   Types of property 'sn' are incompatible.
!!! error TS2322:     Type 'number | undefined' is not assignable to type 'string | number'.
!!! error TS2322:       Type 'undefined' is not assignable to type 'string | number'.
        let allUndefined: { sn: string | number | undefined } = { ...undefinedString, ...undefinedNumber };
    
        let undefinedWithOptionalContinues: { sn: string | number | boolean } = { ...definiteBoolean, ...undefinedString, ...optionalNumber };
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2322: Type '{ sn: string | number | undefined; }' is not assignable to type '{ sn: string | number | boolean; }'.
!!! error TS2322:   Types of property 'sn' are incompatible.
!!! error TS2322:     Type 'string | number | undefined' is not assignable to type 'string | number | boolean'.
!!! error TS2322:       Type 'undefined' is not assignable to type 'string | number | boolean'.
    }
    
    type Movie = {
        title: string;
        yearReleased: number;
    }
    
    const m = { title: "The Matrix", yearReleased: 1999 };
    // should error here because title: undefined is not assignable to string
    const x: Movie = { ...m, title: undefined };
          ~
!!! error TS2322: Type '{ title: undefined; yearReleased: number; }' is not assignable to type 'Movie'.
!!! error TS2322:   Types of property 'title' are incompatible.
!!! error TS2322:     Type 'undefined' is not assignable to type 'string'.
    