Typescript: Mis-parsing of variables named `enum`

[kitsonk]

TypeScript Version: 2.8.3

Search Terms:

• enum variable name

Code

interface Foo {
    enum: string;
}

function bar({ enum }: Foo) {
    if (enum) {
        //
    }
}

Expected behavior:

Code compiles without issue.

Actual behavior:

Error at 5: Enum declarations can only merge with namespace or other enum declarations.
Error at 5: ':' expected.
Error at 6: Enum declarations can only merge with namespace or other enum declarations.
Error at 6: Expression expected.
Error at 6: Identifier expected.

Playground Link:
Playground

[andy-ms]

function bar({ enum }) {} doesn't work in the node.js console either.

[RyanCavanaugh]

Illegal code but we should issue a better parse error here

[kitsonk]

I was scratching my head, because the following is valid:

function bar({ enum: e }) {}

But then I remembered that enum is a reserved word in ECMAScript these days...

[Kingwl]

related #11648