swc_ecma_transforms_base 41.0.1

rust port of babel and closure compiler.
Documentation 
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function _to_primitive(input, hint) {
    if (_type_of(input) !== "object" || input === null) return input;
    var prim = input[Symbol.toPrimitive];
    if (prim !== undefined) {
        var res = prim.call(input, hint || "default");
        if (_type_of(res) !== "object") return res;
        throw new TypeError("@@toPrimitive must return a primitive value.");
    }
    return (hint === "string" ? String : Number)(input);
}