To help you get started, we've collected the most common ways that @actions/tool-cache is being used within popular public projects.

actions / setup-node / src / installer.ts View on Github

version: string
): Promise {
  // Create temporary folder to download in to
  let tempDownloadFolder: string =
    'temp_' + Math.floor(Math.random() * 2000000000);
  let tempDir: string = path.join(tempDirectory, tempDownloadFolder);
  await io.mkdirP(tempDir);
  let exeUrl: string;
  let libUrl: string;
  try {
    exeUrl = `https://nodejs.org/dist/v${version}/win-${os.arch()}/node.exe`;
    libUrl = `https://nodejs.org/dist/v${version}/win-${os.arch()}/node.lib`;

    const exePath = await tc.downloadTool(exeUrl);
    await io.cp(exePath, path.join(tempDir, 'node.exe'));
    const libPath = await tc.downloadTool(libUrl);
    await io.cp(libPath, path.join(tempDir, 'node.lib'));
  } catch (err) {
    if (err instanceof tc.HTTPError && err.httpStatusCode == 404) {
      exeUrl = `https://nodejs.org/dist/v${version}/node.exe`;
      libUrl = `https://nodejs.org/dist/v${version}/node.lib`;

      const exePath = await tc.downloadTool(exeUrl);
      await io.cp(exePath, path.join(tempDir, 'node.exe'));
      const libPath = await tc.downloadTool(libUrl);
      await io.cp(libPath, path.join(tempDir, 'node.lib'));
    } else {
      throw err;
    }
  }
  return await tc.cacheDir(tempDir, 'node', version);
}

View more ways to use @actions/tool-cache

@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:

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:

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:

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.

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:

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:

const tc = require('@actions/tool-cache');

const allNodeVersions = tc.findAllVersions('node');
console.log(`Versions of node available: ${allNodeVersions}`);