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feat: add --no-reload flag to disable hot reload in local commands - #47

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fix/no-reload-flag
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feat: add --no-reload flag to disable hot reload in local commands#47
cortex-assistant[bot] wants to merge 1 commit into
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fix/no-reload-flag

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@cortex-assistant cortex-assistant Bot commented Mar 19, 2026

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Fixes #46.

Adds a --no-reload flag to sam local start-api and sam local start-lambda commands that disables the watchdog-based file observer for hot reloading. This is particularly useful on Windows where Microsoft Defender can cause extreme latency (2-5 minutes) during the recursive directory scanning performed by the file watcher.

When --no-reload is specified:

  • Warm containers still function normally
  • File system observers are not created
  • No hot reload / automatic code change detection

Changes:

  • Added --no-reload CLI option in options.py
  • Threaded the flag through start-api and start-lambda CLI commands
  • Updated InvokeContext to accept and propagate the flag
  • Conditionally skip LambdaFunctionObserver creation in WarmLambdaRuntime via a _NoOpObserver
  • Added unit tests for the new flag

@cortex-assistant cortex-assistant Bot mentioned this pull request Mar 19, 2026
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@bnusunny bnusunny closed this Mar 20, 2026
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@licjun licjun licjun approved these changes
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area/local/invoke area/local/start-api area/local/start-invoke pr/external stage/needs-triage

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Feature request: SAM Local Flag to Disable Hot Reload

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@licjun @bnusunny