@linaria/postcss-linaria: stylelint --fix keeps adding whitespace before a trailing comment

[aki05162525]

Environment

• @linaria/postcss-linaria: 8.1.1
• Stylelint: 17.14.1
• PostCSS: 8.5.23
• Node.js: 24.16.0
• OS: macOS

Description

stylelint --fix inserts whitespace before a comment that trails a declaration on the same line. The amount added equals the indentation of the tagged template, and it is added again on every run:

color: red; /* c */  →  color: red;   /* c */  →  color: red;     /* c */

This reproduces with zero Stylelint rules configured, so the change happens during the parse/stringify round trip. A template that starts at column 0 is not affected.

Reproduction

.stylelintrc.mjs:

export default {
  customSyntax: '@linaria/postcss-linaria',
  rules: {},
};

sample.style.ts — the template is indented by 2:

import { css } from '@linaria/core';

export const style = {
  a: css`
    color: red; /* c */
  `,
};

Run:

stylelint --config .stylelintrc.mjs --fix sample.style.ts

Expected:

color: red; /* c */

Actual, two spaces added per run:

color: red;   /* c */

[aki05162525]

The same round trip drifts in the opposite direction too: indentation is stripped from the continuation lines of a multi-line comment, by the same amount (the template's indentation) and again on every run, until the line reaches column 0.

export const style = {
  a: css`
    /* first line
       second line */
    color: red;
  `,
};

second line */ starts at column 7; one --fix moves it to column 5, three runs to column 1.

Same conditions as above — no rules enabled, and a template at column 0 is unaffected — so I suspect both are the same comment re-indentation path.