spread operator in combination with Set reports error 'error TS2461: Type 'Set<string>' is not an array type.'

[basti1253]

Code

let data: string[] = [];
data.push('foo');
data.push('foo');
data.push('bar');
data = [...new Set(data)];

Expected behavior:
data = [...new Set(data)] should match data = Array.from(new Set(data));
=> ["foo", "bar"]

Actual behavior:
typescript compilation error "error TS2461: Type 'Set' is not an array type."

[basti1253]

additional information:
appears in typescript V2.6.2 & typescript@next

[ajafff]

To make spread work, you either need "target": "ES6" (or higher) or "downlevelIteration": "true" in the compilerOptions of your tsconfig.json

[basti1253]

This worked. Thank you very much for the hint.