//// [inferentialTypingWithObjectLiteralProperties.ts] function f(x: T, y: T): T { return x; } f({ x: [null] }, { x: [1] }).x[0] = "" // ok f({ x: [1] }, { x: [null] }).x[0] = "" // was error TS2011: Cannot convert 'string' to 'number'. //// [inferentialTypingWithObjectLiteralProperties.js] function f(x, y) { return x; } f({ x: [null] }, { x: [1] }).x[0] = ""; // ok f({ x: [1] }, { x: [null] }).x[0] = ""; // was error TS2011: Cannot convert 'string' to 'number'.