Closed
Description
The variable in a for-of loop contains undefined
when the target is set to es6. For es5, everything works as expected.
TypeScript Version:
nightly (1.9.0-dev.20160428)
Code
for (const x of ["a", "b"]) {
x.substring;
}
tsconfig.json:
{
"compilerOptions": {
"module": "commonjs",
"target": "es6",
"strictNullChecks": true
}
}
Expected behavior:
Type of x
is string
in the loop body, no compile error.
Actual behavior:
Type of x
is string | undefined
, which gives an error.