const pl = require('nodejs-polars');

const dx = pl.DataFrame(
        {
            "foo": ["one", "one", "one", "two", "two", "two"],
            "bar": ["A", "B", "C", "A", "B", "C"],
            "baz": [1, 2, 3, 4, 5, 6],
        }
    );
    
dx.pivot("baz", {index:"foo", columns:"bar"});

 ...\node_modules\nodejs-polars\bin\dataframe.js:361
              return (0, exports._DataFrame)(_df.pivotExpr(values, on, index, fn, maintainOrder, sortColumns, separator));
                                                 ^
  Error: Given napi value is not an array
     at Proxy.pivot (C:\...\node_modules\nodejs-polars\bin\dataframe.js:361:48)
    at Object.<anonymous> (C:\....\app.js)
    at Module._compile (node:internal/modules/cjs/loader:1256:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1310:10)
    at Module.load (node:internal/modules/cjs/loader:1119:32)
    at Module._load (node:internal/modules/cjs/loader:960:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:86:12)
    at node:internal/main/run_main_module:23:47 {
  code: 'InvalidArg'
}

Node.js v18.18.0

  shape: (2, 4)
  ┌─────┬─────┬─────┬─────┐
  │ foo ┆ A   ┆ B   ┆ C   │
  │ --- ┆ --- ┆ --- ┆ --- │
  │ str ┆ f64 ┆ f64 ┆ f64 │
  ╞═════╪═════╪═════╪═════╡
  │ one ┆ 1   ┆ 2   ┆ 3   │
  ├╌╌╌╌╌┼╌╌╌╌╌┼╌╌╌╌╌┼╌╌╌╌╌┤
  │ two ┆ 4   ┆ 5   ┆ 6   │
  └─────┴─────┴─────┴─────┘