How to use the @glimmer/syntax.builders.string function in @glimmer/syntax

function constructSwitch(stateExpr: Switch & HasGroup & HasAttrValue, rewrite: IndexedClassRewrite

function constructOutputArgs(rewrite: IndexedClassRewrite): AST.Expression[] {
  let expr = new Array();
  for (let out of rewrite.dynamicClasses) {
    expr.push(builders.string(out));
    expr.push(...constructBoolean(rewrite.dynamicClass(out)!));
  }
  return expr;
}

(arr, val) => {
          if (val.type === "TextNode") {
            arr.push(builders.string(val.chars));
          } else {
            arr.push(val.path);
          }
          return arr;
        },
        new Array()));