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# Logging and Dev-Mode Guidance
This document explains how bitvid routes browser logs, how inline scripts can
re-use the shared logger, and what operators must do with the dev-mode flag when
promoting builds.
## Picking the right channel
bitvid ships a frozen logger at `js/utils/logger.js` with two channels:
- `logger.dev`: Emits only when `IS_DEV_MODE` is truthy. Use this channel for
verbose traces, performance probes, and feature flag experimentation that
should disappear from production consoles. The `logger.dev.debug` helper is
available for especially noisy traces that you want to keep isolated to local
development sessions.
- `logger.user`: Always available and automatically prefixes output with
`[bitvid]`. Use this channel for operator-facing warnings and errors that help
diagnose issues in production.
When adding new messages, classify them by the audience:
| Scenario | Recommended channel | Notes |
| --- | --- | --- |
| Debugging a new feature locally | `logger.dev.debug`/`logger.dev.info` | Remove or downgrade before launching if they no longer serve a purpose. |
| Non-fatal recoverable issues users should investigate | `logger.user.warn` | Provide actionable context so operators know what failed. |
| Fatal errors that block playback or payments | `logger.user.error` | Escalate with a clear message and include relevant IDs or URLs. |
| Metrics or noisy traces that only help during QA | `logger.dev.*` | Wrap expensive logging in conditional checks when possible. |
Avoid direct `console.*` calls—routing everything through the logger keeps the
production console clean and guarantees dev-mode gates behave consistently.
## Using the logger from inline scripts
The logger is exposed as a frozen global so inline scripts can share the same
API without additional bundling:
```js
const { dev, user } = window.bitvidLogger;
dev.log("rendering upload modal preview");
user.warn("Playback manifest missing expected resolution tag");
```
If you need to guard logic by environment, rely on the companion global set in
`js/config.js`:
```js
if (window.__BITVID_DEV_MODE__) {
window.bitvidLogger.dev.info("Hydrating admin widgets in dev mode");
}
```
The globals are populated as soon as `js/config.js` loads. Check for their
existence before using them in third-party contexts that may execute earlier.
## Adjusting the dev-mode flag for deployments
The source of truth lives in `config/instance-config.js`:
- Set `IS_DEV_MODE = true` while developing locally so the dev logger and other
diagnostics are available.
- Flip `IS_DEV_MODE = false` before shipping a production build. This change
propagates to `isDevMode` (the module export), `window.__BITVID_DEV_MODE__`,
and `logger.dev`, silencing development-only messages.
Always commit the flag change alongside deployment-ready configuration tweaks.
Forgetting to update the flag leaves verbose traces in user consoles and can
expose experimental behavior intended only for QA environments.