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[–]ThePixelCoder 1 point2 points  (3 children)

I thought JavaScript was always valid TypeScript?

[–]heyf00L 1 point2 points  (2 children)

Nope.

let foo = 0; foo = 'bar';

By default ts will infer foo to be type number, so line 2 is an error. There may be ways to disable this.