How to use the mapSources function from gulp-sourcemaps

gulpfile.js

GitHub: jayeshpatel182000/pythonVSCode

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result = result
    .pipe(tscFilesTracker)
    .pipe(sourcemaps.init())
    .pipe(tsc())
    .pipe(
        sourcemaps.mapSources(function (sourcePath, file) {
            let tsFileName = path.basename(file.path).replace(/js$/, 'ts');
            const qualifiedSourcePath = path.dirname(file.path).replace('out/', 'src/').replace('out\\', 'src\\');
            if (!fs.existsSync(path.join(qualifiedSourcePath, tsFileName))) {
                const tsxFileName = path.basename(file.path).replace(/js$/, 'tsx');

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+ 19 other calls in file