Greptile Summary

This PR adds npm_args, pnpm_args, bun_args, and aube_args tool options to the npm backend, using shell_words::split to inject user-supplied arguments at the end of each package manager's install command, and wires them into resolve_lockfile_options so they are tracked in the lockfile. The implementation mirrors the pipx backend style and the documentation is correct. The only new finding is that the unit test omits pnpm_args from its coverage, leaving one of the four declared install_time_option_keys untested.

Confidence Score: 4/5

Safe to merge once previously flagged e2e fragilities (--before assertion on modern npm, aube path after .mise.toml overwrite) are resolved.

Core Rust implementation is correct and consistent across all four manager branches. Score is capped at 4 due to pre-existing P1 findings in the e2e test (--before assertion breakage on npm >= 11.10.0, aube availability after heredoc overwrite) that remain unaddressed in this revision.

e2e/backend/test_npm_package_manager — the npm --before assertion and aube path availability after .mise.toml overwrite need attention before CI on modern npm/aube environments.

Important Files Changed

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[install_version_] --> B{package_manager_for_install}
    B -->|Aube| C[write_aube_npmrc\naube add --global pkg@ver\n+ aube_args]
    B -->|Bun| D[bun install pkg@ver --global\n--trust --linker hoisted\n+ install_before_args\n+ bun_args]
    B -->|Pnpm| E[pnpm add --global pkg@ver\n--global-dir --global-bin-dir\n+ install_before_args\n+ pnpm_args]
    B -->|Npm / other| F[npm install -g pkg@ver\n--prefix\n+ install_before_args\n+ npm_args]
    G[resolve_lockfile_options] --> H{iterate install_time_option_keys}
    H -->|npm_args / pnpm_args\nbun_args / aube_args| I[include in lockfile BTreeMap]
    H -->|other keys| J[excluded]

_{Reviews (12): Last reviewed commit: "test(npm): pin pnpm setup version" | Re-trigger Greptile}

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I think this is ok @risu729 but it has merge conflicts

Sorry, I was busy. It should work now.