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Bad inference for destructured object parameter with default value #22644
Description
TypeScript Version: 2.7.2
Search Terms: object literal parameter inference destructuring default value
Code
const fn1 = (options: { headers?: {} }) => {};
// No error as expected
fn1({ headers: { foo: 1 } });
const fn2 = ({ headers = {} }) => {};
// Unexpected error: Property 'foo' does not exist on type '{}'.
fn2({ headers: { foo: 1 } });
Activity
RyanCavanaugh commentedon Mar 16, 2018
Regression from 2.6 -> 2.7
ahejlsberg commentedon Mar 17, 2018
This is an issue exposed by #19513. We're not properly widening types in types implied by object destructuring patterns. Looks like a fairly simple fix.
OliverJAsh commentedon Mar 18, 2018
Thank you!