src/parser.js
function validateProp(key, value) {
    switch (key) {
    case "each":
        return Extender.validateEach(value);
    case "if":
    case "fi":
        return Extender.validateExpr(value);
    default:
        return true;
    }
}
function validateProp(key, value) {
    switch (key) {
    case "each":
        return Extender.validateEach(value);
    case "if":
    case "fi":
        return Extender.validateExpr(value);
    default:
        return true;
    }
}
(string, string) => boolean