Heft start causes re-build multiple times per second #10458
Description
Target SharePoint environment
SharePoint Online
What SharePoint development model, framework, SDK or API is this about?
💥 SharePoint Framework
Developer environment
macOS
What browser(s) / client(s) have you tested
- 💥 Internet Explorer
- 💥 Microsoft Edge
- 💥 Google Chrome
- 💥 FireFox
- 💥 Safari
- mobile (iOS/iPadOS)
- mobile (Android)
- not applicable
- other (enter in the "Additional environment details" area below)
Additional environment details
- SPFx version 1.22
- Node.js version 22.16
Describe the bug / error
After running npm start heft triggers re-build as "requested by typescript" all the time (even without workbench open). It happens very often, more than once per second, here's output that spans around 3 seconds:
-------------------- Finished (0.047s) --------------------
Waiting for changes. Press CTRL + C to exit...
New run requested by typescript
Starting incremental build...
---- build started ----
[build:set-browserslist-ignore-old-data-env-var] Setting environment variable BROWSERSLIST_IGNORE_OLD_DATA=1
[build:webpack] Webpack has not detected changes. Listing previous diagnostics.
---- build finished (0.028s) ----
-------------------- Finished (0.03s) --------------------
Waiting for changes. Press CTRL + C to exit...
New run requested by typescript
Starting incremental build...
---- build started ----
[build:set-browserslist-ignore-old-data-env-var] Setting environment variable BROWSERSLIST_IGNORE_OLD_DATA=1
[build:webpack] Webpack has not detected changes. Listing previous diagnostics.
---- build finished (0.027s) ----
-------------------- Finished (0.029s) --------------------
Waiting for changes. Press CTRL + C to exit...
New run requested by typescript
Starting incremental build...
---- build started ----
[build:set-browserslist-ignore-old-data-env-var] Setting environment variable BROWSERSLIST_IGNORE_OLD_DATA=1
Immediate rerun requested. Executing.
[build:webpack] Webpack has not detected changes. Listing previous diagnostics.
---- build finished (0.032s) ----
-------------------- Finished (0.034s) --------------------
Waiting for changes. Press CTRL + C to exit...
New run requested by typescript
Starting incremental build...
---- build started ----
[build:set-browserslist-ignore-old-data-env-var] Setting environment variable BROWSERSLIST_IGNORE_OLD_DATA=1
[build:webpack] Webpack has not detected changes. Listing previous diagnostics.
---- build finished (0.011s) ----
-------------------- Finished (0.012s) --------------------
Waiting for changes. Press CTRL + C to exit...
New run requested by typescript
Starting incremental build...
---- build started ----
[build:set-browserslist-ignore-old-data-env-var] Setting environment variable BROWSERSLIST_IGNORE_OLD_DATA=1
[build:webpack] Webpack has not detected changes. Listing previous diagnostics.
---- build finished (0.013s) ----
-------------------- Finished (0.014s) --------------------
Waiting for changes. Press CTRL + C to exit...
Steps to reproduce
- Create new 1.22-beta4 project
- Run npm run start
- Check the console output
Expected behavior
- Run build only when needed.