swc/crates/swc_ecma_parser/tests/tsc/validMultipleVariableDeclarations.ts

// all expected to be valid

var x: number;
var x = 2;
if (true) {
    var x = 3;
    for (var x = 0; ;) { }
}
var x = <number>undefined;

// new declaration space, making redeclaring x as a string valid
function declSpace() {
    var x = 'this is a string';
}

interface Point { x: number; y: number; }

var p: Point;
var p = { x: 1, y: 2 };
var p: Point = { x: 0, y: undefined };
var p = { x: 1, y: <number>undefined };
var p: { x: number; y: number; } = { x: 1, y: 2 };
var p = <{ x: number; y: number; }>{ x: 0, y: undefined };
var p: typeof p;

var fn = function (s: string) { return 42; }
var fn = (s: string) => 3;
var fn: (s: string) => number;
var fn: { (s: string): number };
var fn = <(s: string) => number> null;
var fn: typeof fn;

var a: string[]; 
var a = ['a', 'b']
var a = <string[]>[];
var a: string[] = [];
var a = new Array<string>();
var a: typeof a;