58 lines
2.7 KiB
Markdown
58 lines
2.7 KiB
Markdown
# React Nx Tutorial - Step 10: Computation Caching
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<iframe width="560" height="315" src="https://www.youtube.com/embed/aNjvT3VX1Ts" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture; fullscreen"></iframe>
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Nx has built-in computation caching, which helps drastically improve the performance of the commands.
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**To see it in action, run `npx nx build todos`:**
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```bash
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> npx 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: c38fbdb8b372af447180
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Built at: 03/26/2020 11:03:57 AM
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Entrypoint main = runtime.ff0534391bf88384547e.js main.b8dbcd3d3fd2900377f2.esm.js
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Entrypoint polyfills = runtime.ff0534391bf88384547e.js polyfills.55535a35b1529d884ca3.esm.js
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Entrypoint styles = runtime.ff0534391bf88384547e.js styles.3ff695c00d717f2d2a11.css
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chunk {0} runtime.ff0534391bf88384547e.js (runtime) 0 bytes ={1}= ={2}= ={3}= [entry] [rendered]
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chunk {1} main.b8dbcd3d3fd2900377f2.esm.js (main) 155 KiB ={0}= [initial] [rendered]
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chunk {2} polyfills.55535a35b1529d884ca3.esm.js (polyfills) 239 KiB ={0}= [initial] [rendered]
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chunk {3} styles.3ff695c00d717f2d2a11.css (styles) 147 bytes ={0}= [initial] [rendered]
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```
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**Now, run `npx nx build todos` again, and you see the results appearing instantly:**
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```bash
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> npx 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: c38fbdb8b372af447180
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Built at: 03/26/2020 11:05:06 AM
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Entrypoint main = runtime.ff0534391bf88384547e.js main.b8dbcd3d3fd2900377f2.esm.js
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Entrypoint polyfills = runtime.ff0534391bf88384547e.js polyfills.55535a35b1529d884ca3.esm.js
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Entrypoint styles = runtime.ff0534391bf88384547e.js styles.3ff695c00d717f2d2a11.css
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chunk {0} runtime.ff0534391bf88384547e.js (runtime) 0 bytes ={1}= ={2}= ={3}= [entry] [rendered]
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chunk {1} main.b8dbcd3d3fd2900377f2.esm.js (main) 155 KiB ={0}= [initial] [rendered]
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chunk {2} polyfills.55535a35b1529d884ca3.esm.js (polyfills) 239 KiB ={0}= [initial] [rendered]
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chunk {3} styles.3ff695c00d717f2d2a11.css (styles) 147 bytes ={0}= [initial] [rendered]
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```
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Based on the state of the source code and the environment, Nx figured 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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## Building multiple projects
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**Now, run `npx nx run-many --target=build --projects=todos,api` to rebuild the two applications:**
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```bash
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Nx read the output from cache instead of running the command for 1 out of 2 projects.
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```
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Nx built `api` and retrieved `todos` from its computation cache. Read more about the cache [here](/{{framework}}/using-nx/caching).
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> Add --parallel to any command, and Nx does most of the work in parallel.
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