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The example you give has been supported since day 1. Example: document.createElement("canvas") returns HTMLCanvasElement. A limited form of string literal types
by danielearwicker 10y ago
The example you give has been supported since day 1. Example: document.createElement("canvas") returns HTMLCanvasElement. A limited form of string literal types has always been supported specifically for overloading return types. The newer support added in 1.8 is a way more powerful generalisation.