feat(cli): introduce the 'watch' command #17240
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skinny85
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skinny85
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jogold
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@eladb thanks so much for the thorough review! I've incorporated most of your comments, and asked a few clarifying questions for the rest of them. If you could make another pass through the comments, and the code, I would appreciate it - let's get this feature merged! 😊 |
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This PR introduces the "watch" command, in two variants: as a separate new `cdk watch` command, and as an argument to the existing `cdk deploy` command. The "watch" process will observe the project files, defined by the new `"include"` and `"exclude"` settings in `cdk.json` (see aws/aws-cdk-rfcs#383 for details), and will trigger a `cdk deploy` when it detects any changes. The deployment will by default use the new "hotswap" deployments for maximum speed. Since `cdk deploy` is a relatively slow process for a "watch" command, there is some logic to perform intelligent queuing of any file events that happen while `cdk deploy` is running. We will batch all of those events, and trigger a single `cdk deploy` after the current one finishes. This ensures only a single `cdk deploy` command ever executes at a time. The observing of the files, and reacting to their changes, is accomplished using the [`chokidar` library](https://www.npmjs.com/package/chokidar). ---- *By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*
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This PR introduces the "watch" command, in two variants: as a separate new `cdk watch` command, and as an argument to the existing `cdk deploy` command. The "watch" process will observe the project files, defined by the new `"include"` and `"exclude"` settings in `cdk.json` (see aws/aws-cdk-rfcs#383 for details), and will trigger a `cdk deploy` when it detects any changes. The deployment will by default use the new "hotswap" deployments for maximum speed. Since `cdk deploy` is a relatively slow process for a "watch" command, there is some logic to perform intelligent queuing of any file events that happen while `cdk deploy` is running. We will batch all of those events, and trigger a single `cdk deploy` after the current one finishes. This ensures only a single `cdk deploy` command ever executes at a time. The observing of the files, and reacting to their changes, is accomplished using the [`chokidar` library](https://www.npmjs.com/package/chokidar). ---- *By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*
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This PR introduces the "watch" command, in two variants: as a separate new
cdk watchcommand,and as an argument to the existing
cdk deploycommand.The "watch" process will observe the project files, defined by the new
"include"and"exclude"settings incdk.json(see aws/aws-cdk-rfcs#383 for details),
and will trigger a
cdk deploywhen it detects any changes.The deployment will by default use the new "hotswap" deployments for maximum speed.
Since
cdk deployis a relatively slow process for a "watch" command,there is some logic to perform intelligent queuing of any file events that happen while
cdk deployis running.We will batch all of those events, and trigger a single
cdk deployafter the current one finishes.This ensures only a single
cdk deploycommand ever executes at a time.The observing of the files, and reacting to their changes, is accomplished using the
chokidarlibrary.By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license