Function code

packages/stylelint/src/preprocessor.ts:57–122

(input: string, filename: string)

  return {
    async code(input: string, filename: string) {
      let result;

      const transformServices = {
        options: {
          filename,
        },
      };

      try {
        result = await transform(
          transformServices,
          input,
          asyncResolveFallback
        );

        cache[filename] = undefined;
        errors[filename] = undefined;
        offsets[filename] = [];
      } catch (e: unknown) {
        cache[filename] = undefined;
        offsets[filename] = undefined;
        errors[filename] = e as Error;

        // Ignore parse errors here
        // We handle it separately
        return '';
      }

      const { rules, replacements } = result;

      if (!rules) {
        return '';
      }

      // Construct a CSS-ish file from the unprocessed style rules
      let generatedLineNumber = 1;
      const cssText = Object.values(rules)
        .map((rule) => {
          const ruleText = `.${rule.className} {${rule.cssText}}`;

          if (rule.start && 'line' in rule.start) {
            offsets[filename]?.push({
              generated: {
                line: generatedLineNumber,
                column: 1,
              },
              original: {
                ...rule.start,
              },
              name: rule.displayName,
            });

            generatedLineNumber += 1;
          }

          generatedLineNumber += ruleText.split('\n').length + 2;
          return ruleText;