Allow non-TTY stdin watch mode - #448
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The presence of stdin doesn't necessarily mean there's an allocated tty. This breaks watch mode in non-TTY stdin contexts (e.g. docker, foreman, etc). A simple process.stdin.isTTY check would theoretically be enough but unfortunately, subprocesses don't have the same API, which are used extensively to test via calls to `spawn`. A simple solution is to inject an env var dependency where we tell the process that it's indeed a TTY-allocated process and so, watch mode with exit handling is good to go.
This was referenced Nov 29, 2022
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This PR contains the following updates: | Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) | |---|---|---|---| | [postcss-cli](https://github.com/postcss/postcss-cli) | [`^7.1.2` → `^12.0.0`](https://renovatebot.com/diffs/npm/postcss-cli/7.1.2/12.0.0) |  |  | --- ### Release Notes <details> <summary>postcss/postcss-cli (postcss-cli)</summary> ### [`v12.0.0`](https://github.com/postcss/postcss-cli/blob/HEAD/CHANGELOG.md#1200--2026-09-04) [Compare Source](postcss/postcss-cli@11.0.1...12.0.0) - If using a YAML config, the `yaml` package must be installed separately ([#​478](postcss/postcss-cli#478)) - Requires Node.js v22+ ([#​525](postcss/postcss-cli#525)) - Errors if `--config` is passed, but no config is found ([#​467](postcss/postcss-cli#467), [#​522](postcss/postcss-cli#522)) - Now properly exits with an error if invalid options/configuration are passed in watch mode ([#​527](postcss/postcss-cli#527)) - Upgrade to chokidar v5; which results in slightly different handling of `dir-dependency` messages in watch mode ([#​501](postcss/postcss-cli#501)) - Properly watchs all config files if there are multiple config files ([#​536](postcss/postcss-cli#536)) - Minimized dependencies by removing fs-extra ([#​510](postcss/postcss-cli#510)) - Internal refactoring ### [`v11.0.1`](https://github.com/postcss/postcss-cli/blob/HEAD/CHANGELOG.md#1101--2025-03-12) [Compare Source](postcss/postcss-cli@11.0.0...11.0.1) - Update and minimize dependencies ### [`v11.0.0`](https://github.com/postcss/postcss-cli/blob/HEAD/CHANGELOG.md#1100--2023-12-05) [Compare Source](postcss/postcss-cli@10.1.0...11.0.0) - **BREAKING:** Require Node.js v18+ ([#​464](postcss/postcss-cli#464)) - Upgrade to [`postcss-load-config@5`](https://github.com/postcss/postcss-load-config/blob/main/CHANGELOG.md#50-2023-11-20) for improved ESM & TS config support ([#​461](postcss/postcss-cli#461), [#​462](postcss/postcss-cli#462)) ### [`v10.1.0`](https://github.com/postcss/postcss-cli/blob/HEAD/CHANGELOG.md#1010--2022-11-29) [Compare Source](postcss/postcss-cli@10.0.0...10.1.0) - Allow running `--watch` mode in non-TTY contexts, like Docker ([#​448](postcss/postcss-cli#448)) - Update dependencies ### [`v10.0.0`](https://github.com/postcss/postcss-cli/blob/HEAD/CHANGELOG.md#1000--2022-06-29) [Compare Source](postcss/postcss-cli@9.1.0...10.0.0) - **BREAKING:** Drop Node 12 support ([#​438](postcss/postcss-cli#438)) - Add support for ESM config files ([#​437](postcss/postcss-cli#437)) ### [`v9.1.0`](https://github.com/postcss/postcss-cli/blob/HEAD/CHANGELOG.md#910--2021-12-10) [Compare Source](postcss/postcss-cli@9.0.2...9.1.0) - Don't write to files if they're unchanged ([#​320](postcss/postcss-cli#320), [#​417](postcss/postcss-cli#417)) ### [`v9.0.2`](https://github.com/postcss/postcss-cli/blob/HEAD/CHANGELOG.md#902--2021-11-04) [Compare Source](postcss/postcss-cli@9.0.1...9.0.2) - Switch to picocolors ([#​409](postcss/postcss-cli#409)) - Remove test files from npm package ### [`v9.0.1`](https://github.com/postcss/postcss-cli/blob/HEAD/CHANGELOG.md#901--2021-09-28) [Compare Source](postcss/postcss-cli@9.0.0...9.0.1) - Actually exit with error when attempting to stdout in watch mode - Remove `bin/` from `files` in package.json ### [`v9.0.0`](https://github.com/postcss/postcss-cli/blob/HEAD/CHANGELOG.md#900--2021-09-24) [Compare Source](postcss/postcss-cli@8.3.1...9.0.0) - **BREAKING:** Require Node.js v12+ - **BREAKING:** Must specify full file path, including `.js` extension, when loading local plugins with `--use` ([#​401](postcss/postcss-cli#401)) - **BREAKING:** Officially remove support for watching postcss config (was already broken in previous releases) - Add support for `dir-dependency` messages ([#​383](postcss/postcss-cli#383), [#​391](postcss/postcss-cli#391)) - Update deps ### [`v8.3.1`](https://github.com/postcss/postcss-cli/blob/HEAD/CHANGELOG.md#831--2020-12-12) [Compare Source](postcss/postcss-cli@8.3.0...8.3.1) - Ensure paths are not interpreted as numbers ([#​360](postcss/postcss-cli#360)) - Better errors for incorrect postcss version ([#​361](postcss/postcss-cli#361), [#​362](postcss/postcss-cli#362)) ### [`v8.3.0`](https://github.com/postcss/postcss-cli/blob/HEAD/CHANGELOG.md#830--2020-11-17) [Compare Source](postcss/postcss-cli@8.2.0...8.3.0) - Exit on EOF/`^D` ([#​358](postcss/postcss-cli#358)) ### [`v8.2.0`](https://github.com/postcss/postcss-cli/blob/HEAD/CHANGELOG.md#820--2020-10-29) [Compare Source](postcss/postcss-cli@8.1.0...8.2.0) - Allow backslashes in paths for better Windows experience ([#​355](postcss/postcss-cli#355)) ### [`v8.1.0`](https://github.com/postcss/postcss-cli/blob/HEAD/CHANGELOG.md#810--2020-10-08) [Compare Source](postcss/postcss-cli@8.0.0...8.1.0) - Add support for `postcss.config.cjs` files ([#​351](postcss/postcss-cli#351)) ### [`v8.0.0`](https://github.com/postcss/postcss-cli/blob/HEAD/CHANGELOG.md#800--2020-09-21) [Compare Source](postcss/postcss-cli@7.1.2...8.0.0) - **BREAKING:** Support postcss v8 ([#​344](postcss/postcss-cli#344), [#​349](postcss/postcss-cli#349)) - **BREAKING:** postcss is now a `peerDependency`, you must install it seperately ([#​344](postcss/postcss-cli#344), [#​349](postcss/postcss-cli#349)) - Upgrade dependencies ([#​340](postcss/postcss-cli#340)) </details> --- ### Configuration 📅 **Schedule**: (in timezone Etc/UTC) - Branch creation - Between 12:00 AM and 03:59 AM, only on Monday (`* 0-3 * * 1`) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. 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The presence of stdin doesn't necessarily mean there's an allocated tty. This breaks watch mode in non-TTY stdin contexts (e.g. docker, foreman, etc). A simple process.stdin.isTTY check would theoretically be enough but unfortunately, subprocesses don't have the same API, and they are used extensively for testing via calls to the function
spawn.A simple solution is to inject an env var dependency where we tell the process that it's indeed a TTY-allocated process and so, watch mode with exit handling is good to go.
A more robust but also annoying solution would involve using an actual terminal emulator (like Microsoft's node-pty). Though the environment gets exponentially more difficult to setup since it
involves compiling bindings, which require different requirements per OS.
Closes #424