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

// members N and M of types S and T have the same name, same accessibility, same optionality, and N is assignable M
// string named numeric properties work correctly, errors below unless otherwise noted

module JustStrings {
    class S { '1': string; }
    class T { '1.': string; }
    var s: S;
    var t: T;

    interface S2 { '1': string; bar?: string }
    interface T2 { '1.0': string; baz?: string }
    var s2: S2;
    var t2: T2;

    var a: { '1.': string; bar?: string }
    var b: { '1.0': string; baz?: string }

    var a2 = { '1.0': '' };
    var b2 = { '1': '' };

    s = t;
    t = s;
    s = s2; // ok
    s = a2;

    s2 = t2;
    t2 = s2;
    s2 = t;
    s2 = b;
    s2 = a2;

    a = b;
    b = a;
    a = s;
    a = s2;
    a = a2;

    a2 = b2;
    b2 = a2;
    a2 = b; // ok
    a2 = t2; // ok
    a2 = t;
}

module NumbersAndStrings {
    class S { '1': string; }
    class T { 1: string; }
    var s: S;
    var t: T;

    interface S2 { '1': string; bar?: string }
    interface T2 { 1.0: string; baz?: string }
    var s2: S2;
    var t2: T2;

    var a: { '1.': string; bar?: string }
    var b: { 1.0: string; baz?: string }

    var a2 = { '1.0': '' };
    var b2 = { 1.: '' };

    s = t; // ok
    t = s; // ok
    s = s2; // ok
    s = a2; // error

    s2 = t2; // ok
    t2 = s2; // ok
    s2 = t;  // ok
    s2 = b; // ok
    s2 = a2; // error

    a = b; // error
    b = a; // error
    a = s; // error
    a = s2; // error
    a = a2; // error
    a = b2; // error

    a2 = b2; // error
    b2 = a2; // error
    a2 = b; // error
    a2 = t2; // error
    a2 = t; // error
}