angular__angular/tools/package-tools/sourcemap-remap.ts

// There are no type definitions available for these imports.
const sorcery = require('sorcery');

/**
 * Finds the original sourcemap of the file and maps it to the current file.
 * This is useful when multiple transformation happen (e.g `TSC -> Rollup -> Uglify`)
 */
export async function remapSourcemap(sourceFile: string) {
  // Once sorcery loaded the chain of sourcemaps, the new sourcemap will be written asynchronously.
  return (await sorcery.load(sourceFile)).write();
}