One i18n Engine for CLI, CI, and Edge: How i18nprune Validates Locale JSON with Multi-Runtime SDK and Stable `--json` Output

Intro

Translation keys in source and keys in locale JSON drift apart quietly. Most teams patch it with per-repo scripts, stack-specific plugins, or a TMS they do not want in every pipeline.

i18nprune is an MIT, Node.js 18+ toolkit built around one idea: one deterministic TypeScript core exposed as a CLI, programmatic SDK, and optional hosted report/share apps — with automation-first --json output.

This article covers what actually ships today: multi-runtime hosts, cross-platform CLI behavior, locale layouts, translation providers, safe defaults, and the pattern-based extractor that powers validate/sync/cleanup.

One core, many runtimes

@i18nprune/core owns extraction, cache policy, locale IO, issue codes, and all runXxx operations. Hosts own presentation only.

The CLI is a thin Commander host. The same validate result shape appears in CI JSON, SDK embeds, and worker-backed share flows — parity snapshot tests guard regressions.

Cross-platform CLI

The installable binary targets Linux, macOS, and Windows:

• Cache under ~/.i18nprune (or I18NPRUNE_HOME)
• Documented path semantics and doctor warnings for Windows reserved names and long paths
• API output uses forward slashes; on-disk IO uses host path.join

Locale layouts and init presets

Three topologies in config:

• flat_file — e.g. locales/en.json
• locale_per_dir — e.g. messages/en/common.json
• feature_bundle — e.g. messages/auth/en.json

i18nprune init --yes scaffolds config with presets for i18next, next-intl, react-intl, lingui, next-i18next, or generic layouts.

Translation providers and safe mutation defaults

Five provider ids ship today: google, deepl, llm, libre, mymemory. Discover with:

i18nprune providers --json

Policy routing and fallback are config-driven. generate --resume fills missing leaves only — not full re-translation.

Safe defaults:

• cache.profile: balanced (override with safe or fast, or --cache-profile)
• sync --dry-run previews shape changes
• Disk writes require global --yes
• --json runs non-interactively on supported commands

CI: the --json contract

i18nprune validate --json | jq -e '.ok'

Envelope fields: ok, kind, data, issues, meta.apiVersion: "1". Issue codes such as i18nprune.validate.missing_literal_keys are stable API — display copy can change; codes should not.

Extended preflight:

i18nprune doctor --json --strict

Extraction: what we actually built

i18nprune uses an advanced pattern-based extractor (not a single naive regex on t(). Three layers cooperate:

1. Import binding resolver — expands configured functions from ESM/CJS imports, namespaces (i18n.t), and aliases (t as renameT).
2. Per-file const maps — `${NS}.segment` resolves using constants in that file only (duplicate NS across files does not collide).
3. Template rebuild + classification — mixed templates fuse static prefixes with runtime holes; dynamic sites are reported, not guessed into locale JSON.

This design targets ~99%+ on literal and const-resolved template keys (near 100% on plain string-literal keys) in typical JS/TS projects while staying conservative on runtime-only expressions — so cleanup and sync do not silently delete keys you still need.

Stack fixtures in the repo exercise Next, Vue, SvelteKit, Nuxt, and Remix patterns.

Roadmap: optional TypeScript AST assist as an opt-in strictness mode on top of the fast default path. IDE extension reuses the same core (coming soon).

Commands you run day to day

sync and cleanup measure different datasets — both are documented; counts can diverge by design.

SDK embed (no subprocess)

import { resolveContext, runValidate } from '@i18nprune/core';
import { createNodeRuntimeAdapters } from '@i18nprune/core/runtime/node';

const ctx = await resolveContext({
  projectRoot: process.cwd(),
  adapters: createNodeRuntimeAdapters(),
});

const { payload, issues } = await runValidate(ctx, {});

Subpath exports (/validate, /sync, /generate, …) support smaller bundles. Examples: examples/sdk/ in the repo.

Reports and sharing

i18nprune report --format html --out ./i18n-report.html
i18nprune share upload --project --yes

Hosted viewers: report.i18nprune.dev · web.i18nprune.dev. Worker OpenAPI: worker.i18nprune.dev/docs.

Conclusion

If you need a multi-runtime, cross-platform i18n gate with deterministic JSON for CI, incremental generate, and optional hosted review links — i18nprune is built for that path. Lead with what ships; check the releases portal and git timeline for ongoing changes.

Links

• GitHub: https://github.com/zamdevio/i18nprune
• Docs: https://docs.i18nprune.dev
• Home: https://i18nprune.dev
• Web workspace: https://web.i18nprune.dev
• Report viewer: https://report.i18nprune.dev
• Worker API: https://worker.i18nprune.dev/docs
• Releases: https://releases.i18nprune.dev
• Build timeline: https://git.i18nprune.dev

Questions welcome — especially real-world CI integration stories.