Uncaught error while navigating

[mistic100]

Describe the bug
Hi
I am trying to generate the HTML report for a TypeScript project. The setup is rather complex and involves tsup (esbuild) + a custom plugin to instrument each source file + Cypress + @lcov-viewer/istanbul-report

The report generates correctly but I cannot open any file details and the following error is visible in the console.

It corresponds to this line

lcov-viewer/packages/report/src/highlight/tokenize.js

Line 130 in da1e167

const lineTextBefore = lines[line].slice(0, col);

I debugued this piece of code and found that the line variable is NaN. The iterated variable mergedInsertions contains valid and invalid values.

Here is my report-data.js, by the look of it, it contains the source code and no NaN anywhere
report-data.zip

Also the default IstanbulJS lcov HTML report works perfectly.

Thank you for your time

[mistic100]

My setup was inspired by https://www.npmjs.com/package/esbuild-plugin-istanbul which instrument each source file individually.

I then tried to just call nyc instrument on the final bundled file and now the report is working.

I keep this issue open if you want to check why there are NaNs floating arround but feel free to close if its because my report-data is corrupted somehow.