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array.map lose literal types #26999

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@cevek

Description

@cevek

TypeScript Version: 3.1.0-dev.20180906

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Code

interface Item {
    x: number;
    y: 'a' | 'b'
}
var list:Item[] = [].map(it => ({x: 1, y: 'a'}))

Expected behavior:
No error

Actual behavior:
Type 'string' is not assignable to type '"a" | "b"'.

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