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tests/cases/compiler/unknownSymbolOffContextualType1.ts(16,18): error TS2339: Property 'xyxyxyx' does not exist on type 'HTMLElement'.
==== tests/cases/compiler/unknownSymbolOffContextualType1.ts (1 errors) ====
declare var document: Document;
interface Document {
getElementById(elementId: string): HTMLElement;
}
interface HTMLElement {
isDisabled: boolean;
}
function getMaxWidth(elementNames: string[]) {
var elements = elementNames.map(function (name) {
return document.getElementById(name);
});
var enabled = elements.filter(function (e) {
return !e.isDisabled;
});
var widths = enabled.map(function (e) {
return e.xyxyxyx; // error expected here
~~~~~~~
!!! error TS2339: Property 'xyxyxyx' does not exist on type 'HTMLElement'.
});
var maxWidth = widths.reduce(function (a, b) {
return a > b ? a : b;
});
return maxWidth;
}
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