74 lines
2.2 KiB
Markdown
74 lines
2.2 KiB
Markdown
# Node Nx Tutorial - Step 6: Computation Caching
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<iframe width="560" height="315" src="https://www.youtube.com/embed/gXChzhI1Qpg" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture; fullscreen"></iframe>
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Nx has built-in computation caching, which drastically improves the performance of the commands.
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**To see it in action, run `nx build todos`:**
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```bash
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> nx run todos:build
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Starting type checking service...
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Using 14 workers with 2048MB memory limit
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Hash: 51f23143c450a9f931a7
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Built at: 09/04/2020 4:03:20 PM
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Entrypoint main = main.js main.js.map
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chunk {main} main.js, main.js.map (main) 4.17 KiB [entry] [rendered]
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```
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**Now, run `nx build todos` again, and you will see the results appearing instantly:**
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```bash
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> nx run todos:build
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> NX NOTE Cached Output:
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Starting type checking service...
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Using 14 workers with 2048MB memory limit
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Hash: 51f23143c450a9f931a7
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Built at: 09/04/2020 4:03:20 PM
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Entrypoint main = main.js main.js.map
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chunk {main} main.js, main.js.map (main) 4.17 KiB [entry] [rendered]
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```
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Based on the state of the source code and the environment, Nx was able to figure out that it had already run this exact command. Nx found the artifact in the local cache and replayed the output and restored the necessary files.
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## --with-deps
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Nx is smart, so it knows how applications and libraries in the workspace depend on each other.
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**Run `nx lint todos --with-deps`, and you see that Nx lints both the `todos` app and the libraries it depends on.**
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```bash
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> NX Running target lint for project todos and its 2 deps.
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———————————————————————————————————————————————
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> nx run data:lint
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Linting "data"...
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All files pass linting.
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> nx run auth:lint
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Linting "auth"...
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All files pass linting.
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> nx run todos:lint
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Linting "todos"...
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All files pass linting.
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———————————————————————————————————————————————
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> NX SUCCESS Running target "lint" succeeded
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```
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> Add --parallel to any command, and Nx does most of the work in parallel.
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