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// compares the inventory of package items in the tree
// that is about to be installed (idealTree) with the inventory
// of items stored in the package-lock file (virtualTree)
//
// Returns empty array if no errors found or an array populated
// with an entry for each validation error found.
function validateLockfile (virtualTree, idealTree) {
const errors = []
// loops through the inventory of packages resulted by ideal tree,
// for each package compares the versions with the version stored in the
// package-lock and adds an error to the list in case of mismatches
for (const [key, entry] of idealTree.entries()) {
const lock = virtualTree.get(key)
if (!lock) {
errors.push(`Missing: ${entry.name}@${entry.version} from lock file`)
continue
}
if (entry.version !== lock.version) {
errors.push(`Invalid: lock file's ${lock.name}@${lock.version} does ` +
`not satisfy ${entry.name}@${entry.version}`)
}
}
return errors
}
module.exports = validateLockfile