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// https://github.com/Microsoft/TypeScript/issues/29006
export interface A { type: 'a' }
export interface B { type: 'b' }
export type AB = A | B
const itemId = 'some-id'
// --- test on first level ---
const items: { [id: string]: AB } = {}
const { [itemId]: itemOk1 } = items
typeof itemOk1 // pass
// --- test on second level ---
interface ObjWithItems {
items: {[s: string]: AB}
}
const objWithItems: ObjWithItems = { items: {}}
const itemOk2 = objWithItems.items[itemId]
typeof itemOk2 // pass
const {
items: { [itemId]: itemWithTSError } = {} /*happens when default value is provided*/
} = objWithItems
// in order to re-produce the error, uncomment next line:
typeof itemWithTSError // :(
// will result in:
// Error from compilation: TypeError: Cannot read property 'charCodeAt' of undefined TypeError: Cannot read property 'charCodeAt' of undefined
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