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typeAssertionsWithUnionTypes01.ts(14,9): error TS2352: Conversion of type 'I1' to type 'number' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.
==== typeAssertionsWithUnionTypes01.ts (1 errors) ====
interface I1 {
p1: number
}
interface I2 extends I1 {
p2: number;
}
var x = { p1: 10, p2: 20 };
var y: number | I2 = x;
var z: I1 = x;
var a = <number | I2>z;
var b = <number>z;
~~~~~~~~~
!!! error TS2352: Conversion of type 'I1' to type 'number' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.
var c = <I2>z;
var d = <I1>y;
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