Function map always returns column 0 as starting column

[kristijanstefanoski]

I have a very minimal reproduction of using this module and I noticed one thing, the function start column is always reported as 0, when using nyc directly the column is correctly mapped (for ex. 9).

I have the following file called utils.js:

function testUtil() {
  console.log("util");
}

module.exports = {
  testUtil,
};

Then from a file index.js I import this util and call it, and then convert the coverage like so:

const { CoverageInstrumenter } = require("collect-v8-coverage");
const v8toIstanbul = require("v8-to-istanbul");
const converter = v8toIstanbul("./utils.js");

const instrumenter = new CoverageInstrumenter();
const utils = require("./utils");

(async () => {
  await instrumenter.startInstrumenting();

  utils.testUtil();

  const coverage = await instrumenter.stopInstrumenting();
  const utilsCov = coverage.find((cov) => cov.url.includes("utils.js"));

  await converter.load();
  converter.applyCoverage(utilsCov.functions);
  console.info(JSON.stringify(converter.toIstanbul()));
})();

The output for the fnMap is as follows:

      "fnMap":{
         "0":{
            "name":"testUtil",
            "decl":{
               "start":{
                  "line":1,
                  "column":0
               },
               "end":{
                  "line":3,
                  "column":1
               }
            },
            "loc":{
               "start":{
                  "line":1,
                  "column":0
               },
               "end":{
                  "line":3,
                  "column":1
               }
            },
            "line":1
         }
      },

You can notice the declaration part is obviously wrong as the column is not 0, it should actually be 9? The length of the function keyword + 1 probably?