Method originalPositionFor

lib/source-map-consumer.js:478–541

* Returns the original source, line, and column information for the generated * source's line and column positions provided. The only argument is an object * with the following properties: * * - line: The line number in the generated source. The line number * is 1-based. *

(aArgs)

   *   - name: The original identifier, or null.
   */
  originalPositionFor(aArgs) {
    const needle = {
      generatedLine: util.getArg(aArgs, "line"),
      generatedColumn: util.getArg(aArgs, "column"),
    };

    if (needle.generatedLine < 1) {
      throw new Error("Line numbers must be >= 1");
    }

    if (needle.generatedColumn < 0) {
      throw new Error("Column numbers must be >= 0");
    }

    let bias = util.getArg(
      aArgs,
      "bias",
      SourceMapConsumer.GREATEST_LOWER_BOUND
    );
    if (bias == null) {
      bias = SourceMapConsumer.GREATEST_LOWER_BOUND;
    }

    let mapping;
    this._wasm.withMappingCallback(
      m => (mapping = m),
      () => {
        this._wasm.exports.original_location_for(
          this._getMappingsPtr(),
          needle.generatedLine - 1,
          needle.generatedColumn,
          bias
        );
      }
    );

    if (mapping) {
      if (mapping.generatedLine === needle.generatedLine) {
        let source = util.getArg(mapping, "source", null);
        if (source !== null) {
          source = this._absoluteSources.at(source);
        }

        let name = util.getArg(mapping, "name", null);
        if (name !== null) {
          name = this._names.at(name);
        }

        return {
          source,
          line: util.getArg(mapping, "originalLine", null),
          column: util.getArg(mapping, "originalColumn", null),
          name,
        };
      }
    }

    return {