Function prettyPrintAsSourceMap

valdi/vscode_debugger/src/common/sourceUtils.ts:13–45

(
  fileName: string,
  minified: string,
  compiledPath: string,
  sourceMapUrl: string,
)

import { LineColumn } from '../adapter/breakpoints/breakpointBase';

export async function prettyPrintAsSourceMap(
  fileName: string,
  minified: string,
  compiledPath: string,
  sourceMapUrl: string,
): Promise<SourceMap | undefined> {
  const source = beautify(minified);
  const from = generatePositions(source);
  const to = generatePositions(minified);
  if (from.length !== to.length) return Promise.resolve(undefined);

  const generator = new sourceMap.SourceMapGenerator();
  generator.setSourceContent(fileName, source);

  // We know that AST for both sources is the same, so we can
  // walk them together to generate mapping.
  for (let i = 0; i < from.length; i += 2) {
    generator.addMapping({
      source: fileName,
      original: { line: from[i], column: from[i + 1] },
      generated: { line: to[i], column: to[i + 1] },
    });
  }
  return new SourceMap(
    await sourceMap.SourceMapConsumer.fromSourceMap(generator),
    {
      sourceMapUrl,
      compiledPath,
    },
    '',
    [fileName],
  );
}

function generatePositions(text: string) {
  const sourceFile = ts.createSourceFile(