Restores a cache based on key and restoreKeys to the paths provided. Function returns the cache key for cache hit and returns undefined if cache not found.

const cache = require('@actions/cache');
const paths = [
    'node_modules',
    'packages/*/node_modules/'
]
const key = 'npm-foobar-d5ea0750'
const restoreKeys = [
    'npm-foobar-',
    'npm-'
]
const cacheKey = await cache.restoreCache(paths, key, restoreKeys)

Save Cache

Saves a cache containing the files in paths using the key provided. Function returns the cache id if the cache was save succesfully.

const cache = require('@actions/cache');
const paths = [
    'node_modules',
    'packages/*/node_modules/'
]
const key = 'npm-foobar-d5ea0750'
const cacheId = await cache.saveCache(paths, key)

Additional Documentation

See "Caching dependencies to speed up workflows".