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[New] nvm install --offline: install from cache without network access

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Add `--offline` flag to `nvm install` that resolves versions using only locally installed versions and cached downloads. No network calls are made.

New helper functions `nvm_ls_cached` and `nvm_offline_version` scan `$NVM_DIR/.cache/bin/` for previously downloaded tarballs.
In offline mode, `nvm_download_artifact` returns cached tarballs directly without checksum verification or download attempts.
The curl/wget requirement is skipped when `--offline` is set.
Supports `--lts` via locally stored LTS alias files.
This commit is contained in:
Jordan Harband
2026-03-13 16:13:19 -04:00
parent 14d01c6877
commit 59bd32be6b
4 changed files with 208 additions and 17 deletions
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README.md
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@@ -482,6 +482,22 @@ nvm install-latest-npm
If you've already gotten an error to the effect of "npm does not support Node.js", you'll need to (1) revert to a previous node version (`nvm ls` & `nvm use <your latest _working_ version from the ls>`), (2) delete the newly created node version (`nvm uninstall <your _broken_ version of node from the ls>`), then (3) rerun your `nvm install` with the `--latest-npm` flag.
### Offline Install
If you've previously downloaded a node version (or it's still in the cache), you can install it without any network access using the `--offline` flag:
```sh
nvm install --offline 14.7.0
```
This resolves versions using only locally installed versions and cached downloads. It will not attempt to download anything. This is useful in air-gapped environments, on planes, or when you want to avoid network latency.
You can combine `--offline` with `--lts` to install the latest cached LTS version (as long as LTS aliases have been populated by a prior `nvm ls-remote --lts`):
```sh
nvm install --offline --lts
```
### Default Global Packages From File While Installing
If you have a list of default packages you want installed every time you install a new version, we support that too -- just add the package names, one per line, to the file `$NVM_DIR/default-packages`. You can add anything npm would accept as a package argument on the command line.