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# `@actions/tool-cache`
> Functions necessary for downloading and caching tools.
## Usage
#### Download
You can use this to download tools (or other files) from a download URL:
```js
const tc = require('@actions/tool-cache');
const node12Path = await tc.downloadTool('https://nodejs.org/dist/v12.7.0/node-v12.7.0-linux-x64.tar.gz');
```
#### Extract
These can then be extracted in platform specific ways:
```js
const tc = require('@actions/tool-cache');
if (process.platform === 'win32') {
const node12Path = await tc.downloadTool('https://nodejs.org/dist/v12.7.0/node-v12.7.0-win-x64.zip');
const node12ExtractedFolder = await tc.extractZip(node12Path, 'path/to/extract/to');
// Or alternately
const node12Path = await tc.downloadTool('https://nodejs.org/dist/v12.7.0/node-v12.7.0-win-x64.7z');
const node12ExtractedFolder = await tc.extract7z(node12Path, 'path/to/extract/to');
}
else if (process.platform === 'darwin') {
const node12Path = await tc.downloadTool('https://nodejs.org/dist/v12.7.0/node-v12.7.0.pkg');
const node12ExtractedFolder = await tc.extractXar(node12Path, 'path/to/extract/to');
}
else {
const node12Path = await tc.downloadTool('https://nodejs.org/dist/v12.7.0/node-v12.7.0-linux-x64.tar.gz');
const node12ExtractedFolder = await tc.extractTar(node12Path, 'path/to/extract/to');
}
```
#### Cache
Finally, you can cache these directories in our tool-cache. This is useful if you want to switch back and forth between versions of a tool, or save a tool between runs for self-hosted runners.
You'll often want to add it to the path as part of this step:
```js
const tc = require('@actions/tool-cache');
const core = require('@actions/core');
const node12Path = await tc.downloadTool('https://nodejs.org/dist/v12.7.0/node-v12.7.0-linux-x64.tar.gz');
const node12ExtractedFolder = await tc.extractTar(node12Path, 'path/to/extract/to');
const cachedPath = await tc.cacheDir(node12ExtractedFolder, 'node', '12.7.0');
core.addPath(cachedPath);
```
You can also cache files for reuse.
```js
const tc = require('@actions/tool-cache');
const cachedPath = await tc.cacheFile('path/to/exe', 'destFileName.exe', 'myExeName', '1.1.0');
```
#### Find
Finally, you can find directories and files you've previously cached:
```js
const tc = require('@actions/tool-cache');
const core = require('@actions/core');
const nodeDirectory = tc.find('node', '12.x', 'x64');
core.addPath(nodeDirectory);
```
You can even find all cached versions of a tool:
```js
const tc = require('@actions/tool-cache');
const allNodeVersions = tc.findAllVersions('node');
console.log(`Versions of node available: ${allNodeVersions}`);
```