[noUnusedLocals] JSX spreading with type "any" excludes children from used variables

[alitaheri]

TypeScript Version: 2.4.0-dev.20170429

Code

export function render() {
    const foo = 'foo'; // Gives error when noUnusedLocals are enabled.

    // foo is used here, but the compiler doesn't "see" it
    return <div {...{} as any}>{foo}</div>;
}

Expected behavior:
Since foo is used it should compile properly.

Actual behavior:
'foo' is declared but never used.

[mhegazy]

This is caused by the same underlying issue as #15469. it should be fixed by #15548. The fix should be available in typescript@next tomorrow (5/4), please give it a try and let us know if you are still seeing issues.