chore(release): 1.0.0 [skip ci]

# [1.0.0](https://git.mifi.dev/mifi/logger/compare/v0.10.0...v1.0.0) (2026-08-07)

### Features

* API options object support to control sentry handling; removal of `logger.sentry.` ([234226e](234226e2bb))
* API options object support to control sentry handling; removal of `logger.sentry.` ([6bee3a8](6bee3a801d))

### BREAKING CHANGES

* API options object support to control sentry handling; removal of `logger.sentry.`
* API options object support to control sentry handling; removal of `logger.sentry.`

CHANGELOG.md

@@ -1,9 +1,22 @@
-# [0.10.0](https://git.mifi.dev/mifi/logger/compare/v0.9.3...v0.10.0) (2026-08-05)
+# [1.0.0](https://git.mifi.dev/mifi/logger/compare/v0.10.0...v1.0.0) (2026-08-07)
 
 
 ### Features
 
-* **logger:** add explicit Sentry event channel ([44f4716](https://git.mifi.dev/mifi/logger/commit/44f471653e8d4045e87886da1e1bbe04edbd60af))
+* API options object support to control sentry handling; removal of `logger.sentry.` ([234226e](https://git.mifi.dev/mifi/logger/commit/234226e2bbb79acf3b2686890677bd7326c6a0e0))
+* API options object support to control sentry handling; removal of `logger.sentry.` ([6bee3a8](https://git.mifi.dev/mifi/logger/commit/6bee3a801da054a613e84d7985050e7e4e367194))
+
+
+### BREAKING CHANGES
+
+* API options object support to control sentry handling; removal of `logger.sentry.`
+* API options object support to control sentry handling; removal of `logger.sentry.`
+
+# [0.10.0](https://git.mifi.dev/mifi/logger/compare/v0.9.3...v0.10.0) (2026-08-05)
+
+### Features
+
+- **logger:** add explicit Sentry event channel ([44f4716](https://git.mifi.dev/mifi/logger/commit/44f471653e8d4045e87886da1e1bbe04edbd60af))
 
 ## [0.9.3](https://git.mifi.dev/mifi/logger/compare/v0.9.2...v0.9.3) (2026-08-05)
 

README.md

@@ -5,41 +5,201 @@ Intentional, namespaced logging for TypeScript browser and Node.js applications.
 ```ts
 import { createLogger } from "@mifi/logger";
 
-const logger = createLogger({ environment: "production" });
+const logger = createLogger({ environment: "production", namespace: "WIDGET" });
-logger.child("WIDGET").debug("Rendered", () => ({ expensive: "only evaluated when shown" }));
+logger.child("Button").debug("Rendered", () => ({ expensive: "only evaluated when shown" }));
 ```
 
+## Install
+
+```bash
+pnpm add @mifi/logger
+```
+
+Requires Node.js `>=24`. Published to the private `@mifi` registry.
+
+## Quick start
+
+```ts
+import { createLogger } from "@mifi/logger";
+
+const logger = createLogger({
+    environment: "development", // "development" | "staging" | "production"
+    namespace: "API", // optional; string or string[] joined with ":"
+});
+
+logger.trace("very detailed");
+logger.debug("diagnostic", () => ({ snapshot: heavyWork() }));
+logger.info("ready");
+logger.warn("slow response", { ms: 1200 });
+logger.error("request failed", error);
+logger.assert(userId, "missing user id");
+
+const auth = logger.child("auth"); // namespace → "API:auth"
+auth.info("token refreshed");
+```
+
+Console utility methods (`group`, `groupCollapsed`, `table`, `time`, `count`, `dir`, …) are available and gated by the same level policy as `info`.
+
 ## Runtime policy
 
-Development shows every level, staging shows `warn` and `error`, and production shows `error` only. Browser sessions can override the policy with `sessionStorage.showLoggingFor`:
+Default levels by environment:
 
-```text
+| Environment   | Default level | Console shows   |
-debug
+| ------------- | ------------- | --------------- |
-debug:WIDGET,API
+| `development` | `trace`       | all levels      |
+| `staging`     | `warn`        | `warn`, `error` |
+| `production`  | `error`       | `error` only    |
+
+Levels in order (most → least verbose): `trace` → `debug` → `info` → `warn` → `error` → `silent`.
+
+### Override precedence
+
+Highest wins:
+
+1. Explicit `level` option on `createLogger`
+2. Browser `sessionStorage.showLoggingFor`
+3. Env vars `MIFI_LOG_LEVEL` / `MIFI_LOG_NAMESPACES`
+4. Environment default (table above)
+
+### Browser session override
+
+```js
+sessionStorage.setItem("showLoggingFor", "debug");
+// or restrict to namespaces (exact or descendants):
+sessionStorage.setItem("showLoggingFor", "debug:WIDGET,API");
 ```
 
-Containers can use `MIFI_LOG_LEVEL` and `MIFI_LOG_NAMESPACES`. Explicit `level` options take precedence.
+`WIDGET` matches `WIDGET` and `WIDGET:Button`.
+
+### Container / Node env overrides
+
+See [Environment variables](#environment-variables) and [`env.example`](./env.example).
+
+```bash
+MIFI_LOG_LEVEL=debug
+MIFI_LOG_NAMESPACES=WIDGET,API
+```
+
+## Environment variables
+
+These are read from `process.env` (or from `options.env` when testing/injecting):
+
+| Variable              | Description                                                                 |
+| --------------------- | --------------------------------------------------------------------------- |
+| `MIFI_LOG_LEVEL`      | Override level: `trace`, `debug`, `info`, `warn`, `error`, or `silent`.     |
+| `MIFI_LOG_NAMESPACES` | Optional comma-separated namespace filters applied with the level override. |
+
+When only `MIFI_LOG_LEVEL` is set, all namespaces are enabled at that level. When `MIFI_LOG_NAMESPACES` is also set, only matching namespaces (and their children) emit at that level.
+
+Copy [`env.example`](./env.example) as a starting point for local or container config.
 
 ## Sentry
 
-The Sentry adapter has no SDK dependency. Provide the SDK that your application already uses. In a production browser, errors go to Sentry without also appearing in the console. In Node, they go to both Sentry and stderr. Use `logger.sentry` to explicitly capture selected non-error events without changing the default policy or writing them to the console when they are otherwise suppressed.
+The Sentry adapter has **no SDK dependency**. Provide the SDK your application already uses via `@mifi/logger/sentry`.
+
+**Development never sends to Sentry.** Staging and production attach the sink when `sentry` is configured.
+
+Destination policy when `sentry` is configured and `sinks` is not:
+
+| Runtime + environment  | Console                | Sentry                           |
+| ---------------------- | ---------------------- | -------------------------------- |
+| Production **browser** | Off                    | Issues for errors; optional Logs |
+| Production **Node**    | On (stderr for errors) | Issues for errors; optional Logs |
+| Staging                | On (default `warn`+)   | Issues for errors; optional Logs |
+| Development            | On                     | Nothing                          |
+
+### Issues vs Logs
+
+- **Errors** → Sentry Issues (`captureException` / `captureMessage`). Not also written to Logs.
+- **Warnings and lower** → Sentry Logs (`sentry.logger.*`) only when `{ logs: true }` on the sink (or forced per call).
+
+Default Sentry Logs thresholds when `logs` is enabled:
+
+| Environment | Logs threshold |
+| ----------- | -------------- |
+| Staging     | `info`         |
+| Production  | `warn`         |
+
+Override with `logLevel` on `createSentrySink`. Console policy stays independent — production browsers can stay quiet while warnings still appear in Sentry Logs.
+
+### Per-call options
+
+`trace` / `debug` / `log` / `info` / `warn` / `error` (and `assert`) accept a trailing options object. Console utilities (`group`, `time`, …) do not.
 
 ```ts
 import * as Sentry from "@sentry/nextjs";
 import { createLogger } from "@mifi/logger";
 import { createSentrySink } from "@mifi/logger/sentry";
 
-const logger = createLogger({ environment: "production", sentry: createSentrySink(Sentry) });
+const logger = createLogger({
+    environment: "production",
+    namespace: "API",
+    sentry: createSentrySink(Sentry, { logs: true }),
+});
 
-logger.sentry.info("Cache warmed", { entries: 42 });
+logger.error("Request failed", error, { requestId: "req_1" });
+logger.warn("slow", { ms: 1200 }); // → Sentry Logs in production
+logger.info("investigating", { orderId }, { sentry: true }); // force Logs
+logger.error("expected", err, { suppressSentry: true }); // console only (when enabled)
+```
+
+| Option                 | Effect                                                                   |
+| ---------------------- | ------------------------------------------------------------------------ |
+| `sentry: true`         | Force this event to Sentry Logs (ignores Logs threshold; not for errors) |
+| `suppressSentry: true` | Skip creating a Sentry Issue for an error                                |
+
+A last argument is treated as options only when every key is `sentry` or `suppressSentry`. Prefer the third-argument form when you also pass data.
+
+Logs payload: string message + flat primitive attributes (including `logger.namespace`). Nested objects are not unfurled.
+
+## Custom sinks
+
+Replace the default destinations entirely with `sinks`:
+
+```ts
+import { createLogger, createConsoleSink, type LogSink } from "@mifi/logger";
+
+const analyticsSink: LogSink = {
+    emit(event) {
+        if (event.sendToConsole) analytics.track("log", event);
+    },
+};
+
+const logger = createLogger({
+    environment: "production",
+    sinks: [createConsoleSink(), analyticsSink],
+});
+```
+
+When `sinks` is provided, the `sentry` option is not used for default sink selection.
+
+## API overview
+
+| Export                 | From                  | Purpose                                          |
+| ---------------------- | --------------------- | ------------------------------------------------ |
+| `createLogger`         | `@mifi/logger`        | Build a namespaced, Console-shaped logger        |
+| `createConsoleSink`    | `@mifi/logger`        | Default styled console destination               |
+| `parseLoggingOverride` | `@mifi/logger`        | Parse `debug` / `debug:NS1,NS2` override strings |
+| `createSentrySink`     | `@mifi/logger/sentry` | Adapter for any Sentry-like SDK                  |
+
+Types: `Logger`, `LoggerOptions`, `LogLevel`, `LoggerEnvironment`, `LogEvent`, `LogSink`, `LogData`, `LogCallOptions`, and (from `/sentry`) `SentryLike`, `SentryScopeLike`, `SentrySink`, `SentrySinkOptions`.
+
+Optional destinations live under `src/sinks/` (console, Sentry today; New Relic / Datadog-style adapters can land beside them later). Public import paths stay `@mifi/logger` and `@mifi/logger/sentry`.
+
+All public APIs include JSDoc with parameter and example documentation in the TypeScript sources.
+
+## Lazy arguments
+
+Any function passed **after** the first argument is invoked only if the event is emitted:
+
+```ts
+logger.debug("state", () => buildHugeSnapshot()); // skipped when debug is suppressed
 ```
 
 ## Releases
 
 Woodpecker verifies pull requests and `main`, reports CI to Mattermost, then automatically releases from Conventional Commits merged to `main`. It updates `package.json` and `CHANGELOG.md`, creates a `vX.Y.Z` tag, and publishes to the private `@mifi` registry.
 
-Use `fix:` for a patch, `feat:` for a minor release, and `!` or a `BREAKING CHANGE:` footer for a major release. Commits such as `docs:`, `test:`, and `chore:` do not release a package. Before enabling the automation, publish and tag the existing `v0.9.1` once as its baseline.
+Use `fix:` for a patch, `feat:` for a minor release, and `feat!` / `fix!` (or a `BREAKING CHANGE:` footer) for a major release. Commits such as `docs:`, `test:`, and `chore:` do not release a package.
 
 The release workflow uses the existing global `gitea_package_token`, `gitea_registry_username`, `gitea_release_token`, `mattermost_bot_access_token`, `mattermost_tests_channel_id`, `mattermost_pushes_channel_id`, and `mattermost_post_api_url` secrets.
-
-The repository includes a guarded, one-time manual bootstrap workflow for `v0.9.1`; remove it after that initial package version has been published.

env.example

@@ -0,0 +1,19 @@
+# @mifi/logger — environment variables
+#
+# Copy this file or set the variables in your container / process environment.
+# Explicit `level` on createLogger() always takes precedence over these values.
+# In browsers, sessionStorage.showLoggingFor is checked before these env vars.
+
+# Override the log level for this process.
+# One of: trace | debug | info | warn | error | silent
+# When unset, the level defaults from the logger's `environment` option:
+#   development → trace
+#   staging     → warn
+#   production  → error
+# MIFI_LOG_LEVEL=debug
+
+# Optional comma-separated namespace filters applied together with MIFI_LOG_LEVEL.
+# A filter matches the namespace exactly or as a prefix of a child
+# (e.g. WIDGET matches WIDGET and WIDGET:Button).
+# When unset (and MIFI_LOG_LEVEL is set), all namespaces are enabled at that level.
+# MIFI_LOG_NAMESPACES=WIDGET,API

package.json

@@ -1,6 +1,6 @@
 {
     "name": "@mifi/logger",
-    "version": "0.10.0",
+    "version": "1.0.0",
     "description": "Intentional, namespaced logging for browser and Node.js TypeScript applications.",
     "repository": {
         "type": "git",

release.config.cjs

@@ -5,13 +5,23 @@ const repositoryUrl =
         ? `https://${encodeURIComponent(releaseUsername)}:${encodeURIComponent(releaseToken)}@git.mifi.dev/mifi/logger.git`
         : "https://git.mifi.dev/mifi/logger.git";
 
+/**
+ * Default Angular preset rejects `feat!` / `fix!` headers entirely (no release).
+ * These parser options match Conventional Commits so `!` becomes a BREAKING CHANGE note.
+ */
+const conventionalCommitParserOpts = {
+    headerPattern: /^(\w*)(?:\((.*)\))?!?: (.*)$/,
+    breakingHeaderPattern: /^(\w*)(?:\((.*)\))?!: (.*)$/,
+    noteKeywords: ["BREAKING CHANGE", "BREAKING-CHANGE"],
+};
+
 module.exports = {
     branches: ["main"],
     repositoryUrl,
     tagFormat: "v${version}",
     plugins: [
-        "@semantic-release/commit-analyzer",
+        ["@semantic-release/commit-analyzer", { parserOpts: conventionalCommitParserOpts }],
-        "@semantic-release/release-notes-generator",
+        ["@semantic-release/release-notes-generator", { parserOpts: conventionalCommitParserOpts }],
         ["@semantic-release/changelog", { changelogFile: "CHANGELOG.md" }],
         "@semantic-release/npm",
         [

src/index.ts

@@ -1,2 +1,16 @@
-export * from "./logger.js";
+/**
-export * from "./types.js";
+ * @mifi/logger — intentional, namespaced logging for browser and Node.js.
+ *
+ * @packageDocumentation
+ *
+ * @example
+ * ```ts
+ * import { createLogger } from "@mifi/logger";
+ *
+ * const logger = createLogger({ environment: "development", namespace: "APP" });
+ * logger.info("started");
+ * ```
+ */
+export * from "./logger";
+export * from "./sinks/console";
+export * from "./types";

src/logger.ts

@@ -1,4 +1,6 @@
+import { createConsoleSink } from "./sinks/console";
 import type {
+    LogCallOptions,
     LogData,
     LogEvent,
     Logger,
@@ -6,15 +8,68 @@ import type {
     LoggerOptions,
     LogLevel,
     LogSink,
-} from "./types.js";
+} from "./types";
+
+/** Duck-type for sinks created by `createSentrySink` (avoids importing the sentry entry). */
+type SentrySinkLike = LogSink & {
+    kind: "sentry";
+    options: { logs?: boolean; logLevel?: LogLevel };
+};
+
+function isSentrySinkLike(sink: LogSink): sink is SentrySinkLike {
+    return "kind" in sink && (sink as { kind?: unknown }).kind === "sentry";
+}
 
 const LEVELS: readonly Exclude<LogLevel, "silent">[] = ["trace", "debug", "info", "warn", "error"];
+const LOG_CALL_OPTION_KEYS = new Set(["sentry", "suppressSentry"]);
+
+/** Numeric rank for comparing levels; `silent` is above every emit level. */
 const levelRank = (level: LogLevel): number =>
     level === "silent" ? Infinity : LEVELS.indexOf(level);
+
+/**
+ * Default {@link LogLevel} for a {@link LoggerEnvironment} when no override is set.
+ *
+ * @param environment - Deployment stage.
+ * @returns `trace` (development), `warn` (staging), or `error` (production).
+ */
 const defaultLevel = (environment: LoggerEnvironment): LogLevel =>
     environment === "development" ? "trace" : environment === "staging" ? "warn" : "error";
 
-/** Parses `debug` or `debug:WIDGET,API`, used by browser and container overrides. */
+/**
+ * Default Sentry Logs threshold when `createSentrySink(..., { logs: true })` is
+ * used without an explicit `logLevel`.
+ *
+ * @param environment - Deployment stage.
+ * @returns `info` (staging) or `warn` (production). Development never sends.
+ */
+export const defaultSentryLogLevel = (environment: LoggerEnvironment): LogLevel =>
+    environment === "staging" ? "info" : "warn";
+
+/**
+ * Parses a runtime logging override string used by browser session storage and
+ * container env composition.
+ *
+ * Accepted forms:
+ * - `"debug"` — set level only (all namespaces)
+ * - `"debug:WIDGET,API"` — set level and restrict to matching namespaces
+ *   (exact match or descendant, e.g. `WIDGET` matches `WIDGET:Button`)
+ *
+ * @param value - Raw override string, or `null`/`undefined` when unset.
+ * @returns Parsed level and namespace filters, or `undefined` if invalid/empty.
+ *
+ * @example
+ * ```ts
+ * parseLoggingOverride("debug");
+ * // → { level: "debug", namespaces: [] }
+ *
+ * parseLoggingOverride("warn:WIDGET, API");
+ * // → { level: "warn", namespaces: ["WIDGET", "API"] }
+ *
+ * parseLoggingOverride("verbose");
+ * // → undefined
+ * ```
+ */
 export function parseLoggingOverride(
     value: string | null | undefined,
 ): { level: LogLevel; namespaces: readonly string[] } | undefined {
@@ -31,6 +86,40 @@ export function parseLoggingOverride(
     };
 }
 
+/**
+ * Whether a value is a trailing {@link LogCallOptions} object (only known keys).
+ *
+ * @param value - Candidate last argument from a log call.
+ */
+export function isLogCallOptions(value: unknown): value is LogCallOptions {
+    if (!value || typeof value !== "object" || Array.isArray(value) || value instanceof Error)
+        return false;
+    const keys = Object.keys(value);
+    return keys.length > 0 && keys.every((key) => LOG_CALL_OPTION_KEYS.has(key));
+}
+
+/**
+ * Splits trailing {@link LogCallOptions} from log arguments.
+ *
+ * @param arguments_ - Raw call arguments.
+ * @returns Remaining arguments and parsed options (defaults to `{}`).
+ */
+function splitLogCallArguments(arguments_: readonly unknown[]): {
+    arguments: readonly unknown[];
+    options: LogCallOptions;
+} {
+    if (arguments_.length === 0) return { arguments: arguments_, options: {} };
+    const last = arguments_[arguments_.length - 1];
+    if (!isLogCallOptions(last)) return { arguments: arguments_, options: {} };
+    return { arguments: arguments_.slice(0, -1), options: last };
+}
+
+/**
+ * Resolves session storage for browser overrides.
+ *
+ * @param provided - Optional storage; when omitted, uses `globalThis.sessionStorage`.
+ * @returns A `getItem`-compatible storage, or `undefined` if unavailable.
+ */
 function resolveStorage(provided?: Pick<Storage, "getItem">): Pick<Storage, "getItem"> | undefined {
     if (provided) return provided;
     try {
@@ -40,6 +129,12 @@ function resolveStorage(provided?: Pick<Storage, "getItem">): Pick<Storage, "get
     }
 }
 
+/**
+ * Resolves the environment variable map for Node/container overrides.
+ *
+ * @param provided - Optional map; when omitted, uses `process.env` if present.
+ * @returns A string-keyed env map (may be empty).
+ */
 function resolveEnv(
     provided?: Record<string, string | undefined>,
 ): Record<string, string | undefined> {
@@ -50,11 +145,26 @@ function resolveEnv(
     );
 }
 
+/**
+ * Resolves whether the logger is running in a browser or Node-like runtime.
+ *
+ * @param provided - Explicit runtime; when omitted, inferred from `globalThis.window`.
+ * @returns `"browser"` if `window` is defined, otherwise `"node"`.
+ */
 function resolveRuntime(provided?: "browser" | "node"): "browser" | "node" {
     if (provided) return provided;
     return typeof (globalThis as { window?: unknown }).window === "undefined" ? "node" : "browser";
 }
 
+/**
+ * Whether a logger namespace matches any of the configured filters.
+ *
+ * Empty `filters` means “match all”. Otherwise the namespace must equal a
+ * filter or start with `filter:`.
+ *
+ * @param namespace - Logger namespace, if any.
+ * @param filters - Namespace prefixes from a runtime override.
+ */
 function namespaceMatches(namespace: string | undefined, filters: readonly string[]): boolean {
     return (
         filters.length === 0 ||
@@ -65,13 +175,73 @@ function namespaceMatches(namespace: string | undefined, filters: readonly strin
     );
 }
 
+/**
+ * Evaluates lazy log arguments: every argument after the first that is a
+ * zero-arg function is invoked; earlier arguments and non-functions are kept.
+ *
+ * @param arguments_ - Raw call arguments (message first, then optional data).
+ * @returns Arguments with lazy factories resolved to their return values.
+ */
 function evaluate(arguments_: readonly unknown[]): readonly unknown[] {
     return arguments_.map((argument, index) =>
         index > 0 && typeof argument === "function" ? (argument as () => LogData)() : argument,
     );
 }
 
-/** Creates an intentional, Console-shaped logger. Functions passed after the message are evaluated lazily. */
+/**
+ * Resolves Sentry sink options from `options.sentry` or a Sentry sink in `sinks`.
+ * Development always yields `undefined` (nothing is sent to Sentry).
+ */
+function resolveSentrySinkOptions(
+    options: LoggerOptions,
+): { logs: boolean; logLevel: LogLevel } | undefined {
+    if (options.environment === "development") return undefined;
+    const candidate = options.sentry ? options.sentry : options.sinks?.find(isSentrySinkLike);
+    if (!candidate) return undefined;
+    if (isSentrySinkLike(candidate)) {
+        return {
+            logs: Boolean(candidate.options.logs),
+            logLevel: candidate.options.logLevel ?? defaultSentryLogLevel(options.environment),
+        };
+    }
+    return { logs: false, logLevel: defaultSentryLogLevel(options.environment) };
+}
+
+/**
+ * Creates an intentional, Console-shaped logger with namespacing, lazy
+ * arguments, environment-aware defaults, and optional Sentry integration.
+ *
+ * **Console level precedence** (highest wins):
+ * 1. `options.level`
+ * 2. `sessionStorage.showLoggingFor` (browser)
+ * 3. `MIFI_LOG_LEVEL` + optional `MIFI_LOG_NAMESPACES` (Node/containers)
+ * 4. Default for `options.environment`
+ *
+ * **Default sinks** (when `options.sinks` is omitted):
+ * - Always include a console sink except production **browser** with Sentry.
+ * - In staging/production with `options.sentry`, include that sink.
+ * - Development never attaches or sends to Sentry.
+ *
+ * Functions passed after the first argument are evaluated lazily — only when
+ * the event is emitted — so expensive snapshots stay cheap when suppressed.
+ *
+ * @param options - Logger configuration. See {@link LoggerOptions}.
+ * @returns A {@link Logger} instance.
+ *
+ * @example
+ * ```ts
+ * import { createLogger } from "@mifi/logger";
+ *
+ * const logger = createLogger({
+ *   environment: "production",
+ *   namespace: "API",
+ * });
+ *
+ * logger.error("Request failed", error);
+ * logger.debug("skipped in production", () => hugeObject());
+ * logger.warn("investigate", { id: 1 }, { sentry: true });
+ * ```
+ */
 export function createLogger(options: LoggerOptions): Logger {
     const namespace =
         typeof options.namespace === "string"
@@ -87,29 +257,38 @@ export function createLogger(options: LoggerOptions): Logger {
         );
     const threshold = options.level ?? runtimeOverride?.level ?? defaultLevel(options.environment);
     const runtime = resolveRuntime(options.runtime);
+    const sentrySinkOptions = resolveSentrySinkOptions(options);
+    const sentryActive = sentrySinkOptions !== undefined;
     const sinks: readonly LogSink[] = options.sinks ?? [
         ...(runtime === "node" || options.environment !== "production" || !options.sentry
             ? [createConsoleSink()]
             : []),
-        ...(options.environment === "production" && options.sentry ? [options.sentry] : []),
+        ...(options.sentry && options.environment !== "development" ? [options.sentry] : []),
     ];
     const enabled = (level: Exclude<LogLevel, "silent">) =>
         levelRank(level) >= levelRank(threshold) &&
         (!runtimeOverride?.namespaces.length ||
             namespaceMatches(namespace, runtimeOverride.namespaces));
-    const emit = (
+    const emit = (level: Exclude<LogLevel, "silent">, arguments_: readonly unknown[]) => {
-        level: Exclude<LogLevel, "silent">,
+        const split = splitLogCallArguments(arguments_);
-        arguments_: readonly unknown[],
-        sendToSentry = false,
-    ) => {
         const sendToConsole = enabled(level);
-        if (!sendToConsole && !sendToSentry) return;
+        const sendToSentryIssue =
+            sentryActive && level === "error" && !split.options.suppressSentry;
+        const sendToSentryLogs =
+            sentryActive &&
+            level !== "error" &&
+            (Boolean(split.options.sentry) ||
+                (Boolean(sentrySinkOptions?.logs) &&
+                    levelRank(level) >= levelRank(sentrySinkOptions.logLevel)));
+        if (!sendToConsole && !sendToSentryIssue && !sendToSentryLogs) return;
         const event: LogEvent = {
             level,
             namespace,
-            arguments: evaluate(arguments_),
+            arguments: evaluate(split.arguments),
             timestamp: new Date(),
-            sendToSentry,
+            environment: options.environment,
+            sendToSentryLogs,
+            sendToSentryIssue,
             sendToConsole,
         };
         sinks.forEach((sink) => sink.emit(event));
@@ -130,14 +309,6 @@ export function createLogger(options: LoggerOptions): Logger {
     };
     const api: Logger = {
         namespace,
-        sentry: {
-            trace: (...items) => emit("trace", items, true),
-            debug: (...items) => emit("debug", items, true),
-            log: (...items) => emit("info", items, true),
-            info: (...items) => emit("info", items, true),
-            warn: (...items) => emit("warn", items, true),
-            error: (...items) => emit("error", items, true),
-        },
         child: (child) =>
             createLogger({ ...options, namespace: [namespace, child].filter(Boolean) as string[] }),
         trace: (...items) => emit("trace", items),
@@ -168,52 +339,13 @@ export function createLogger(options: LoggerOptions): Logger {
     return api;
 }
 
+/**
+ * Prepends a bracketed namespace label to console utility method arguments.
+ *
+ * @param namespace - Colon-joined namespace, if any.
+ * @param arguments_ - Evaluated log arguments.
+ * @returns Arguments with `[A][B]` prefix when namespaced.
+ */
 function prefix(namespace: string | undefined, arguments_: readonly unknown[]): readonly unknown[] {
     return namespace ? [`[${namespace.split(":").join("][")}]`, ...arguments_] : arguments_;
 }
-
-const ANSI_RESET = "\u001B[0m";
-const ANSI_BY_LEVEL: Record<Exclude<LogLevel, "silent">, string> = {
-    trace: "\u001B[90m",
-    debug: "\u001B[36m",
-    info: "\u001B[32m",
-    warn: "\u001B[33m",
-    error: "\u001B[31m",
-};
-const BROWSER_STYLE_BY_LEVEL: Record<Exclude<LogLevel, "silent">, string> = {
-    trace: "color: #6b7280; font-weight: 600",
-    debug: "color: #0891b2; font-weight: 600",
-    info: "color: #15803d; font-weight: 600",
-    warn: "color: #a16207; font-weight: 700",
-    error: "color: #dc2626; font-weight: 700",
-};
-
-function isBrowser(): boolean {
-    return typeof (globalThis as { window?: unknown }).window !== "undefined";
-}
-
-function supportsAnsi(): boolean {
-    return Boolean(
-        (globalThis as { process?: { stdout?: { isTTY?: boolean } } }).process?.stdout?.isTTY,
-    );
-}
-
-/** Default readable console destination. Node's `console.error` writes to stderr. */
-export function createConsoleSink(): LogSink {
-    return {
-        emit: (event) => {
-            if (!event.sendToConsole) return;
-            const method = event.level === "trace" ? "debug" : event.level;
-            const console_ = globalThis.console as Console & Record<string, unknown>;
-            const fn = console_[method];
-            if (typeof fn !== "function") return;
-            const label = event.namespace ? `[${event.namespace.split(":").join("][")}]` : "[LOG]";
-            const arguments_ = isBrowser()
-                ? [`%c${label}`, BROWSER_STYLE_BY_LEVEL[event.level], ...event.arguments]
-                : supportsAnsi()
-                  ? [`${ANSI_BY_LEVEL[event.level]}${label}${ANSI_RESET}`, ...event.arguments]
-                  : [label, ...event.arguments];
-            (fn as (...items: unknown[]) => void).apply(console_, arguments_);
-        },
-    };
-}

src/sentry.ts

@@ -1,37 +1,2 @@
-import type { LogEvent, LogSink } from "./types.js";
+/** Public entry for `@mifi/logger/sentry`. Implementation: `src/sinks/sentry.ts`. */
-
+export * from "./sinks/sentry";
-export interface SentryScopeLike {
-    setLevel(level: string): void;
-    setTag(key: string, value: string): void;
-    setExtras(extras: Record<string, unknown>): void;
-}
-export interface SentryLike {
-    withScope(callback: (scope: SentryScopeLike) => void): void;
-    captureException(error: Error): void;
-    captureMessage(message: string, level: string): void;
-}
-
-/** Creates an optional Sentry adapter without adding a Sentry SDK dependency to this package. */
-export function createSentrySink(sentry: SentryLike): LogSink {
-    return {
-        emit(event: LogEvent) {
-            if (event.level !== "error" && !event.sendToSentry) return;
-            const error = event.arguments.find((item): item is Error => item instanceof Error);
-            const extras = Object.fromEntries(
-                event.arguments
-                    .filter((item) => item && typeof item === "object" && !(item instanceof Error))
-                    .map((item, index) => [`context_${index}`, item]),
-            );
-            const message =
-                event.arguments.filter((item) => typeof item === "string").join(" ") ||
-                "Logger error";
-            sentry.withScope((scope) => {
-                scope.setLevel(event.level);
-                if (event.namespace) scope.setTag("logger.namespace", event.namespace);
-                scope.setExtras(extras);
-                if (error) sentry.captureException(error);
-                else sentry.captureMessage(message, event.level);
-            });
-        },
-    };
-}

src/sinks/console.ts

@@ -0,0 +1,67 @@
+import type { LogLevel, LogSink } from "../types";
+
+const ANSI_RESET = "\u001B[0m";
+const ANSI_BY_LEVEL: Record<Exclude<LogLevel, "silent">, string> = {
+    trace: "\u001B[90m",
+    debug: "\u001B[36m",
+    info: "\u001B[32m",
+    warn: "\u001B[33m",
+    error: "\u001B[31m",
+};
+const BROWSER_STYLE_BY_LEVEL: Record<Exclude<LogLevel, "silent">, string> = {
+    trace: "color: #6b7280; font-weight: 600",
+    debug: "color: #0891b2; font-weight: 600",
+    info: "color: #15803d; font-weight: 600",
+    warn: "color: #a16207; font-weight: 700",
+    error: "color: #dc2626; font-weight: 700",
+};
+
+/** Whether the current global looks like a browser (`window` is defined). */
+function isBrowser(): boolean {
+    return typeof (globalThis as { window?: unknown }).window !== "undefined";
+}
+
+/** Whether Node stdout is a TTY that can display ANSI colors. */
+function supportsAnsi(): boolean {
+    return Boolean(
+        (globalThis as { process?: { stdout?: { isTTY?: boolean } } }).process?.stdout?.isTTY,
+    );
+}
+
+/**
+ * Default readable console {@link LogSink}.
+ *
+ * - Skips events where `sendToConsole` is `false`.
+ * - Maps `trace` to `console.debug`.
+ * - Prefixes a styled namespace label (`[A][B]` or `[LOG]`).
+ * - Uses CSS `%c` styling in browsers and ANSI colors on Node TTYs.
+ * - Node `error` level uses `console.error` (stderr).
+ *
+ * @returns A sink suitable as the default destination or for custom sink lists.
+ *
+ * @example
+ * ```ts
+ * const logger = createLogger({
+ *   environment: "development",
+ *   sinks: [createConsoleSink(), customSink],
+ * });
+ * ```
+ */
+export function createConsoleSink(): LogSink {
+    return {
+        emit: (event) => {
+            if (!event.sendToConsole) return;
+            const method = event.level === "trace" ? "debug" : event.level;
+            const console_ = globalThis.console as Console & Record<string, unknown>;
+            const fn = console_[method];
+            if (typeof fn !== "function") return;
+            const label = event.namespace ? `[${event.namespace.split(":").join("][")}]` : "[LOG]";
+            const arguments_ = isBrowser()
+                ? [`%c${label}`, BROWSER_STYLE_BY_LEVEL[event.level], ...event.arguments]
+                : supportsAnsi()
+                  ? [`${ANSI_BY_LEVEL[event.level]}${label}${ANSI_RESET}`, ...event.arguments]
+                  : [label, ...event.arguments];
+            (fn as (...items: unknown[]) => void).apply(console_, arguments_);
+        },
+    };
+}

src/sinks/sentry.ts

@@ -0,0 +1,194 @@
+import type { LogEvent, LogLevel, LogSink } from "../types";
+
+/**
+ * Options for {@link createSentrySink}.
+ *
+ * Sentry Logs are independent of the console level. Defaults when `logs` is
+ * enabled and `logLevel` is omitted: staging → `info`, production → `warn`.
+ * Development never sends (enforced by the logger).
+ */
+export interface SentrySinkOptions {
+    /**
+     * When `true`, non-error events at or above {@link SentrySinkOptions.logLevel}
+     * are written to `sentry.logger.*`. Errors still become Issues only.
+     */
+    logs?: boolean;
+    /**
+     * Minimum level for automatic Sentry Logs delivery when {@link SentrySinkOptions.logs}
+     * is enabled. Per-call `{ sentry: true }` bypasses this threshold.
+     */
+    logLevel?: LogLevel;
+}
+
+/**
+ * Minimal Sentry scope surface required by {@link createSentrySink}.
+ * Satisfied by `@sentry/browser`, `@sentry/node`, `@sentry/nextjs`, etc.
+ */
+export interface SentryScopeLike {
+    /**
+     * Sets the severity for the event about to be captured.
+     * @param level - Logger level string (e.g. `"error"`, `"info"`).
+     */
+    setLevel(level: string): void;
+    /**
+     * Attaches a string tag to the event.
+     * @param key - Tag name (this package uses `"logger.namespace"`).
+     * @param value - Tag value.
+     */
+    setTag(key: string, value: string): void;
+    /**
+     * Attaches structured extras derived from non-Error object arguments.
+     * @param extras - Key/value map of searchable context.
+     */
+    setExtras(extras: Record<string, unknown>): void;
+}
+
+/**
+ * Minimal `sentry.logger` surface for Sentry Logs.
+ * Optional on {@link SentryLike}; Logs are skipped when absent.
+ */
+export interface SentryLoggerApiLike {
+    trace(message: string, attributes?: Record<string, string | number | boolean>): void;
+    debug(message: string, attributes?: Record<string, string | number | boolean>): void;
+    info(message: string, attributes?: Record<string, string | number | boolean>): void;
+    warn(message: string, attributes?: Record<string, string | number | boolean>): void;
+    error(message: string, attributes?: Record<string, string | number | boolean>): void;
+}
+
+/**
+ * Minimal Sentry client surface required by {@link createSentrySink}.
+ * Pass your app's Sentry SDK module; this package does not depend on Sentry.
+ *
+ * @example
+ * ```ts
+ * import * as Sentry from "@sentry/nextjs";
+ * import { createSentrySink } from "@mifi/logger/sentry";
+ *
+ * const sink = createSentrySink(Sentry, { logs: true });
+ * ```
+ */
+export interface SentryLike {
+    /**
+     * Runs `callback` with an isolated scope for tagging/extras.
+     * @param callback - Receives a {@link SentryScopeLike} to configure.
+     */
+    withScope(callback: (scope: SentryScopeLike) => void): void;
+    /**
+     * Captures an `Error` instance as an exception event.
+     * @param error - The first `Error` found in the log arguments, if any.
+     */
+    captureException(error: Error): void;
+    /**
+     * Captures a string message when no `Error` is present in the arguments.
+     * @param message - Joined string arguments, or a fallback.
+     * @param level - Event severity.
+     */
+    captureMessage(message: string, level: string): void;
+    /** Structured Logs API. Required when using `{ logs: true }` or `{ sentry: true }`. */
+    logger?: SentryLoggerApiLike;
+}
+
+/** Sink returned by {@link createSentrySink}. */
+export interface SentrySink extends LogSink {
+    readonly kind: "sentry";
+    readonly options: SentrySinkOptions;
+}
+
+/**
+ * Type guard for sinks created by {@link createSentrySink}.
+ *
+ * @param sink - Any {@link LogSink}.
+ */
+export function isSentrySink(sink: LogSink): sink is SentrySink {
+    return "kind" in sink && (sink as { kind?: unknown }).kind === "sentry";
+}
+
+function isAttributeValue(value: unknown): value is string | number | boolean {
+    return typeof value === "string" || typeof value === "number" || typeof value === "boolean";
+}
+
+/**
+ * Builds a Sentry Logs message and flat primitive attributes from a log event.
+ *
+ * @param event - Emitted log event (call options already stripped from arguments).
+ */
+export function toSentryLogPayload(event: LogEvent): {
+    message: string;
+    attributes: Record<string, string | number | boolean>;
+} {
+    const message =
+        event.arguments.filter((item) => typeof item === "string").join(" ") || "Log event";
+    const attributes: Record<string, string | number | boolean> = {};
+    if (event.namespace) attributes["logger.namespace"] = event.namespace;
+    for (const item of event.arguments) {
+        if (!item || typeof item !== "object" || item instanceof Error || Array.isArray(item))
+            continue;
+        for (const [key, value] of Object.entries(item as Record<string, unknown>)) {
+            if (isAttributeValue(value)) attributes[key] = value;
+        }
+    }
+    return { message, attributes };
+}
+
+/**
+ * Creates a {@link LogSink} that forwards events to a Sentry-compatible SDK
+ * without adding a Sentry dependency to `@mifi/logger`.
+ *
+ * Capture rules (flags are set by {@link createLogger}):
+ * - `sendToSentryIssue` → `captureException` / `captureMessage` (errors only).
+ * - `sendToSentryLogs` → `sentry.logger[level]` (non-errors; never doubles an Issue).
+ *
+ * Enable automatic Logs with `{ logs: true }`. Override the threshold with
+ * `logLevel` (defaults: staging `info`, production `warn`). Force a single
+ * event with `{ sentry: true }` on the log call. Suppress an Issue with
+ * `{ suppressSentry: true }`.
+ *
+ * @param sentry - Any object implementing {@link SentryLike} (typically the Sentry SDK).
+ * @param options - Optional Logs configuration.
+ * @returns A sink to pass as `sentry` or inside `sinks` on {@link createLogger}.
+ *
+ * @example
+ * ```ts
+ * import * as Sentry from "@sentry/node";
+ * import { createLogger } from "@mifi/logger";
+ * import { createSentrySink } from "@mifi/logger/sentry";
+ *
+ * const logger = createLogger({
+ *   environment: "production",
+ *   namespace: "API",
+ *   sentry: createSentrySink(Sentry, { logs: true }),
+ * });
+ *
+ * logger.error("Request failed", new Error("offline"), { requestId: "req_1" });
+ * logger.warn("slow", { ms: 1200 }); // → Sentry Logs in production when logs enabled
+ * logger.info("probe", { id: 1 }, { sentry: true }); // forced Logs
+ * logger.error("expected", err, { suppressSentry: true });
+ * ```
+ */
+export function createSentrySink(sentry: SentryLike, options: SentrySinkOptions = {}): SentrySink {
+    return {
+        kind: "sentry",
+        options,
+        emit(event: LogEvent) {
+            if (event.environment === "development") return;
+            if (event.sendToSentryIssue) {
+                const error = event.arguments.find((item): item is Error => item instanceof Error);
+                const { message, attributes } = toSentryLogPayload(event);
+                sentry.withScope((scope) => {
+                    scope.setLevel(event.level);
+                    if (event.namespace) scope.setTag("logger.namespace", event.namespace);
+                    scope.setExtras(attributes);
+                    if (error) sentry.captureException(error);
+                    else sentry.captureMessage(message, event.level);
+                });
+                return;
+            }
+            if (!event.sendToSentryLogs || !sentry.logger) return;
+            const method = event.level === "trace" ? "trace" : event.level;
+            const log = sentry.logger[method];
+            if (typeof log !== "function") return;
+            const { message, attributes } = toSentryLogPayload(event);
+            log.call(sentry.logger, message, attributes);
+        },
+    };
+}

src/types.ts

@@ -1,77 +1,289 @@
-/** A severity threshold, ordered from most to least verbose. */
+/**
+ * Severity threshold for log filtering, ordered from most to least verbose.
+ *
+ * | Level     | Meaning                                      |
+ * |-----------|----------------------------------------------|
+ * | `trace`   | Extremely detailed diagnostics               |
+ * | `debug`   | Development diagnostics                      |
+ * | `info`    | Routine operational messages                 |
+ * | `warn`    | Unexpected but recoverable conditions        |
+ * | `error`   | Failures that need attention                 |
+ * | `silent`  | Suppresses all console-bound output          |
+ *
+ * A logger emits events at or above its configured threshold (e.g. `warn`
+ * allows `warn` and `error`).
+ */
 export type LogLevel = "trace" | "debug" | "info" | "warn" | "error" | "silent";
+
+/**
+ * Deployment stage used to pick a default log level when none is configured
+ * explicitly or via runtime overrides.
+ *
+ * Defaults:
+ * - `development` → `trace`
+ * - `staging` → `warn`
+ * - `production` → `error`
+ */
 export type LoggerEnvironment = "development" | "staging" | "production";
+
+/**
+ * A value passed as a log argument after the message.
+ *
+ * Prefer a zero-argument function for expensive payloads: it is only invoked
+ * when the event is actually emitted, so suppressed logs avoid the work.
+ *
+ * @example
+ * ```ts
+ * logger.debug("state", () => expensiveSnapshot());
+ * ```
+ */
 export type LogData = unknown | (() => unknown);
 
-/** A structured event after its level policy has allowed it to be emitted. */
+/**
+ * Per-call options for `trace` / `debug` / `log` / `info` / `warn` / `error`
+ * (and `assert`). Not supported on console utilities such as `group`.
+ *
+ * When the last argument is a plain object whose keys are only these option
+ * names, it is treated as options rather than log data.
+ */
+export interface LogCallOptions {
+    /**
+     * Force this event to Sentry Logs, ignoring the Sentry Logs threshold.
+     * No-op for `error` (errors become Issues, not Logs) and in development.
+     */
+    sentry?: boolean;
+    /**
+     * Skip creating a Sentry Issue for an `error`-level event.
+     * No-op at lower levels.
+     */
+    suppressSentry?: boolean;
+}
+
+/**
+ * A structured log event after level and namespace policy have allowed it
+ * (or after it was selected for Sentry delivery).
+ */
 export interface LogEvent {
+    /** Severity of this event. Never `silent`. */
     level: Exclude<LogLevel, "silent">;
+    /**
+     * Colon-joined namespace for this logger (e.g. `"WIDGET:Button"`).
+     * Omitted when the logger was created without a namespace.
+     */
     namespace?: string;
+    /**
+     * Evaluated arguments for the event (call options already stripped).
+     * Lazy `() => unknown` functions have already been invoked.
+     */
     arguments: readonly unknown[];
+    /** Wall-clock time when the event was created. */
     timestamp: Date;
-    /** Whether this event was explicitly selected for Sentry capture. */
+    /** Deployment stage from {@link LoggerOptions.environment}. */
-    sendToSentry: boolean;
+    environment: LoggerEnvironment;
-    /** Whether the default console sink should render this event. */
+    /**
+     * `true` when the event should be written to Sentry Logs
+     * (`sentry.logger.*`), not as an Issue.
+     */
+    sendToSentryLogs: boolean;
+    /**
+     * `true` when the event should be captured as a Sentry Issue
+     * (`captureException` / `captureMessage`).
+     */
+    sendToSentryIssue: boolean;
+    /**
+     * `true` when the event passed the logger's level/namespace policy and
+     * should be rendered by console-oriented sinks.
+     */
     sendToConsole: boolean;
 }
 
-/** A destination for enabled log events. */
+/**
+ * Destination that receives enabled {@link LogEvent}s.
+ *
+ * Provide custom sinks via {@link LoggerOptions.sinks}, or use
+ * {@link createConsoleSink} / `createSentrySink` from `@mifi/logger/sentry`.
+ *
+ * @example
+ * ```ts
+ * const sink: LogSink = {
+ *   emit(event) {
+ *     if (event.sendToConsole) analytics.track("log", event);
+ *   },
+ * };
+ * ```
+ */
 export interface LogSink {
+    /**
+     * Handle a single log event.
+     * Implementations should respect `sendToConsole` / `sendToSentryLogs` /
+     * `sendToSentryIssue` as needed.
+     */
     emit(event: LogEvent): void;
 }
 
+/**
+ * Options for {@link createLogger}.
+ *
+ * Precedence for the effective console level (highest wins):
+ * 1. Explicit {@link LoggerOptions.level}
+ * 2. Browser `sessionStorage.showLoggingFor` (or {@link LoggerOptions.sessionStorage})
+ * 3. `MIFI_LOG_LEVEL` / `MIFI_LOG_NAMESPACES` from {@link LoggerOptions.env} or `process.env`
+ * 4. Default for {@link LoggerOptions.environment}
+ */
 export interface LoggerOptions {
+    /**
+     * Deployment stage. Selects the default log level when no override applies.
+     * @see LoggerEnvironment
+     */
     environment: LoggerEnvironment;
+    /**
+     * Optional namespace label(s). A string is used as-is; an array is joined
+     * with `:` (empty segments dropped). Shown in console output as
+     * `[A][B]` for `"A:B"`.
+     *
+     * @example
+     * ```ts
+     * createLogger({ environment: "development", namespace: "API" });
+     * createLogger({ environment: "development", namespace: ["WIDGET", "Button"] });
+     * ```
+     */
     namespace?: string | readonly string[];
-    /** Runtime used for the default destination policy. It is inferred when omitted. */
+    /**
+     * Runtime used for the default destination policy (console vs Sentry-only
+     * in production browsers). Inferred from `globalThis.window` when omitted.
+     */
     runtime?: "browser" | "node";
-    /** Hard override. It takes precedence over runtime environment defaults. */
+    /**
+     * Hard level override. Takes precedence over session storage, env vars,
+     * and environment defaults.
+     */
     level?: LogLevel;
-    /** Browser-only session override source; defaults to global sessionStorage when available. */
+    /**
+     * Browser-only source for the `showLoggingFor` override key.
+     * Defaults to `globalThis.sessionStorage` when available.
+     *
+     * Expected value format matches {@link parseLoggingOverride}:
+     * `debug` or `debug:WIDGET,API`.
+     */
     sessionStorage?: Pick<Storage, "getItem">;
-    /** Node/container environment source; defaults to process.env when available. */
+    /**
+     * Node/container environment variable map. Defaults to `process.env`
+     * when available.
+     *
+     * Recognized keys:
+     * - `MIFI_LOG_LEVEL` — one of the {@link LogLevel} values
+     * - `MIFI_LOG_NAMESPACES` — optional comma-separated namespace filters
+     */
     env?: Record<string, string | undefined>;
-    /** Production error destination. Browser errors go only here; Node errors also go to stderr. */
+    /**
+     * Staging/production Sentry destination (typically from `createSentrySink`).
+     * Ignored in development (nothing is sent to Sentry).
+     *
+     * - Production **browser**: default sinks are Sentry only (no console).
+     * - Production **Node**: console (stderr for errors) and Sentry.
+     * - Staging: console and Sentry.
+     *
+     * Ignored when {@link LoggerOptions.sinks} is provided.
+     */
     sentry?: LogSink | false;
-    /** Complete destination override. When provided, `sentry` and default console behavior are not used. */
+    /**
+     * Complete destination list. When set, replaces the default console/Sentry
+     * policy entirely — {@link LoggerOptions.sentry} is not used.
+     */
     sinks?: readonly LogSink[];
 }
 
-/** Explicit Sentry reporting methods. These bypass the logger's normal level threshold. */
+/**
-export interface SentryLogger {
+ * Console-shaped logger with namespaces, lazy arguments, child loggers,
-    trace(...arguments_: readonly unknown[]): void;
+ * and optional Sentry Issues / Logs delivery.
-    debug(...arguments_: readonly unknown[]): void;
+ *
-    log(...arguments_: readonly unknown[]): void;
+ * Standard methods (`trace` … `error`) accept an optional trailing
-    info(...arguments_: readonly unknown[]): void;
+ * {@link LogCallOptions} object. Console utility methods (`group`, `time`,
-    warn(...arguments_: readonly unknown[]): void;
+ * `table`, …) are gated by the same console policy and call through to
-    error(...arguments_: readonly unknown[]): void;
+ * `globalThis.console` when enabled — they do not accept {@link LogCallOptions}.
-}
+ *
-
+ * @example
+ * ```ts
+ * const logger = createLogger({ environment: "development", namespace: "WIDGET" });
+ * logger.info("ready");
+ * logger.child("Button").debug("clicked", { id: 1 });
+ * logger.warn("investigate", { orderId }, { sentry: true });
+ * logger.error("expected", err, { suppressSentry: true });
+ * ```
+ */
 export interface Logger {
+    /**
+     * Colon-joined namespace for this instance, if any.
+     * Immutable; use {@link Logger.child} to nest further segments.
+     */
     readonly namespace?: string;
-    /** Sends selected events to a configured Sentry sink without changing the default policy for other logs. */
+    /**
-    readonly sentry: SentryLogger;
+     * Returns a new logger that appends `namespace` to this logger's namespace.
+     *
+     * @param namespace - Segment to append (e.g. `"Button"` → `"WIDGET:Button"`).
+     * @returns A new {@link Logger} sharing the same options and sinks.
+     *
+     * @example
+     * ```ts
+     * const widget = createLogger({ environment: "development", namespace: "WIDGET" });
+     * const button = widget.child("Button"); // namespace === "WIDGET:Button"
+     * ```
+     */
     child(namespace: string): Logger;
+    /** Emit a `trace` event when the level policy allows it. */
+    trace(message?: unknown, data?: LogData, options?: LogCallOptions): void;
     trace(...arguments_: readonly unknown[]): void;
+    /** Emit a `debug` event when the level policy allows it. */
+    debug(message?: unknown, data?: LogData, options?: LogCallOptions): void;
     debug(...arguments_: readonly unknown[]): void;
+    /** Alias of {@link Logger.info}. */
+    log(message?: unknown, data?: LogData, options?: LogCallOptions): void;
     log(...arguments_: readonly unknown[]): void;
+    /** Emit an `info` event when the level policy allows it. */
+    info(message?: unknown, data?: LogData, options?: LogCallOptions): void;
     info(...arguments_: readonly unknown[]): void;
+    /** Emit a `warn` event when the level policy allows it. */
+    warn(message?: unknown, data?: LogData, options?: LogCallOptions): void;
     warn(...arguments_: readonly unknown[]): void;
+    /** Emit an `error` event when the level policy allows it. */
+    error(message?: unknown, data?: LogData, options?: LogCallOptions): void;
     error(...arguments_: readonly unknown[]): void;
+    /**
+     * When `condition` is falsy, emits an `error` with `"Assertion failed"`
+     * followed by any extra arguments (optional trailing {@link LogCallOptions}).
+     *
+     * @param condition - Truthy values pass silently.
+     * @param arguments_ - Extra context included with the failure event.
+     */
     assert(condition: unknown, ...arguments_: readonly unknown[]): void;
+    /** Starts a console group when the level policy allows `info`. */
     group(...arguments_: readonly unknown[]): void;
+    /** Starts a collapsed console group when the level policy allows `info`. */
     groupCollapsed(...arguments_: readonly unknown[]): void;
+    /** Ends the current console group when the level policy allows `info`. */
     groupEnd(): void;
+    /** Logs an object with interactive inspection when the level policy allows `info`. */
     dir(item?: unknown, options?: unknown): void;
+    /** Logs XML/HTML as an interactive tree when the level policy allows `info`. */
     dirxml(...arguments_: readonly unknown[]): void;
+    /** Renders tabular data when the level policy allows `info`. */
     table(tabularData?: unknown, properties?: readonly string[]): void;
+    /** Clears the console when the level policy allows `info`. */
     clear(): void;
+    /** Increments a named counter when the level policy allows `info`. */
     count(label?: string): void;
+    /** Resets a named counter when the level policy allows `info`. */
     countReset(label?: string): void;
+    /** Starts a named timer when the level policy allows `info`. */
     time(label?: string): void;
+    /** Logs elapsed time for a named timer when the level policy allows `info`. */
     timeLog(label?: string, ...arguments_: readonly unknown[]): void;
+    /** Stops a named timer and logs elapsed time when the level policy allows `info`. */
     timeEnd(label?: string): void;
+    /** Adds a timestamp marker to the performance timeline when allowed. */
     timeStamp(label?: string): void;
+    /** Starts a CPU profile (where supported) when the level policy allows `info`. */
     profile(label?: string): void;
+    /** Ends a CPU profile (where supported) when the level policy allows `info`. */
     profileEnd(label?: string): void;
 }

test/logger.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, it, vi } from "vitest";
-import { createLogger, parseLoggingOverride } from "../src/index.js";
+import { createLogger, isLogCallOptions, parseLoggingOverride } from "../src/index";
-import type { LogEvent, LogSink } from "../src/index.js";
+import type { LogEvent, LogSink } from "../src/index";
+import { createSentrySink } from "../src/sentry";
 
 function sink(): { sink: LogSink; events: LogEvent[] } {
     const events: LogEvent[] = [];
@@ -18,6 +19,17 @@ describe("parseLoggingOverride", () => {
     });
 });
 
+describe("isLogCallOptions", () => {
+    it("accepts only known option keys", () => {
+        expect(isLogCallOptions({ sentry: true })).toBe(true);
+        expect(isLogCallOptions({ suppressSentry: true })).toBe(true);
+        expect(isLogCallOptions({ sentry: true, suppressSentry: false })).toBe(true);
+        expect(isLogCallOptions({ requestId: "req_1" })).toBe(false);
+        expect(isLogCallOptions({ sentry: true, requestId: "req_1" })).toBe(false);
+        expect(isLogCallOptions({})).toBe(false);
+    });
+});
+
 describe("createLogger", () => {
     it("uses environment defaults and never evaluates suppressed lazy data", () => {
         const destination = sink();
@@ -74,11 +86,16 @@ describe("createLogger", () => {
         });
         logger.error("captured");
         expect(destination.events).toHaveLength(1);
+        expect(destination.events[0]).toMatchObject({
+            sendToSentryIssue: true,
+            sendToSentryLogs: false,
+            sendToConsole: true,
+        });
         expect(consoleError).not.toHaveBeenCalled();
         consoleError.mockRestore();
     });
 
-    it("sends explicitly selected production events to Sentry without writing them to the console", () => {
+    it("forces selected events to Sentry Logs without writing them to the console", () => {
         const destination = sink();
         const consoleInfo = vi.spyOn(console, "info").mockImplementation(() => undefined);
         const logger = createLogger({
@@ -86,18 +103,89 @@ describe("createLogger", () => {
             runtime: "browser",
             sentry: destination.sink,
         });
-        logger.sentry.info("Cache warmed");
+        logger.info("Cache warmed", { sentry: true });
         expect(destination.events).toHaveLength(1);
         expect(destination.events[0]).toMatchObject({
             level: "info",
             arguments: ["Cache warmed"],
-            sendToSentry: true,
+            sendToSentryLogs: true,
+            sendToSentryIssue: false,
             sendToConsole: false,
         });
         expect(consoleInfo).not.toHaveBeenCalled();
         consoleInfo.mockRestore();
     });
 
+    it("strips trailing call options from event arguments and supports data plus options", () => {
+        const destination = sink();
+        const logger = createLogger({
+            environment: "production",
+            runtime: "browser",
+            sentry: destination.sink,
+        });
+        logger.warn("slow", { ms: 1200 }, { sentry: true });
+        expect(destination.events[0]).toMatchObject({
+            level: "warn",
+            arguments: ["slow", { ms: 1200 }],
+            sendToSentryLogs: true,
+            sendToConsole: false,
+        });
+    });
+
+    it("suppresses Sentry Issues when suppressSentry is set", () => {
+        const destination = sink();
+        const logger = createLogger({
+            environment: "production",
+            runtime: "browser",
+            sentry: destination.sink,
+        });
+        logger.error("expected", new Error("nope"), { suppressSentry: true });
+        expect(destination.events).toHaveLength(1);
+        expect(destination.events[0]).toMatchObject({
+            sendToSentryIssue: false,
+            sendToSentryLogs: false,
+            arguments: ["expected", expect.any(Error)],
+        });
+    });
+
+    it("never marks events for Sentry in development", () => {
+        const destination = sink();
+        const logger = createLogger({
+            environment: "development",
+            sinks: [
+                destination.sink,
+                createSentrySink(
+                    {
+                        withScope: (callback) =>
+                            callback({
+                                setLevel: () => undefined,
+                                setTag: () => undefined,
+                                setExtras: () => undefined,
+                            }),
+                        captureException: vi.fn(),
+                        captureMessage: vi.fn(),
+                        logger: {
+                            trace: vi.fn(),
+                            debug: vi.fn(),
+                            info: vi.fn(),
+                            warn: vi.fn(),
+                            error: vi.fn(),
+                        },
+                    },
+                    { logs: true },
+                ),
+            ],
+        });
+        logger.error("local only");
+        logger.info("probe", { sentry: true });
+        expect(destination.events).toHaveLength(2);
+        expect(
+            destination.events.every(
+                (event) => !event.sendToSentryIssue && !event.sendToSentryLogs,
+            ),
+        ).toBe(true);
+    });
+
     it("keeps production Node errors on stderr as well as sending them to Sentry", () => {
         const destination = sink();
         const consoleError = vi.spyOn(console, "error").mockImplementation(() => undefined);
@@ -111,4 +199,73 @@ describe("createLogger", () => {
         expect(consoleError).toHaveBeenCalledTimes(1);
         consoleError.mockRestore();
     });
+
+    it("mirrors warn to Sentry Logs in production when logs are enabled on the sink", () => {
+        const destination = sink();
+        const logger = createLogger({
+            environment: "production",
+            runtime: "browser",
+            sinks: [
+                destination.sink,
+                createSentrySink(
+                    {
+                        withScope: () => undefined,
+                        captureException: vi.fn(),
+                        captureMessage: vi.fn(),
+                        logger: {
+                            trace: vi.fn(),
+                            debug: vi.fn(),
+                            info: vi.fn(),
+                            warn: vi.fn(),
+                            error: vi.fn(),
+                        },
+                    },
+                    { logs: true },
+                ),
+            ],
+        });
+        logger.warn("noisy");
+        logger.info("below default production logs threshold");
+        expect(destination.events).toHaveLength(1);
+        expect(destination.events[0]).toMatchObject({
+            level: "warn",
+            sendToSentryLogs: true,
+            sendToConsole: false,
+        });
+    });
+
+    it("mirrors info to Sentry Logs in staging when logs are enabled", () => {
+        const destination = sink();
+        const logger = createLogger({
+            environment: "staging",
+            runtime: "browser",
+            sinks: [
+                destination.sink,
+                createSentrySink(
+                    {
+                        withScope: () => undefined,
+                        captureException: vi.fn(),
+                        captureMessage: vi.fn(),
+                        logger: {
+                            trace: vi.fn(),
+                            debug: vi.fn(),
+                            info: vi.fn(),
+                            warn: vi.fn(),
+                            error: vi.fn(),
+                        },
+                    },
+                    { logs: true },
+                ),
+            ],
+        });
+        logger.info("visible in staging logs");
+        logger.debug("still below staging logs threshold");
+        expect(destination.events.map((event) => event.arguments[0])).toEqual([
+            "visible in staging logs",
+        ]);
+        expect(destination.events[0]).toMatchObject({
+            sendToSentryLogs: true,
+            sendToConsole: false,
+        });
+    });
 });

test/sentry.test.ts

@@ -1,28 +1,114 @@
 import { describe, expect, it, vi } from "vitest";
-import { createLogger } from "../src/index.js";
+import { createLogger } from "../src/index";
-import { createSentrySink } from "../src/sentry.js";
+import { createSentrySink, toSentryLogPayload } from "../src/sentry";
 
-describe("createSentrySink", () => {
+function createFakeSentry() {
-    it("captures errors and explicitly selected events with namespace and structured context", () => {
     const scope = { setLevel: vi.fn(), setTag: vi.fn(), setExtras: vi.fn() };
-        const sentry = {
+    return {
+        scope,
+        sentry: {
             withScope: (callback: (value: typeof scope) => void) => callback(scope),
             captureException: vi.fn(),
             captureMessage: vi.fn(),
+            logger: {
+                trace: vi.fn(),
+                debug: vi.fn(),
+                info: vi.fn(),
+                warn: vi.fn(),
+                error: vi.fn(),
+            },
+        },
     };
+}
+
+describe("toSentryLogPayload", () => {
+    it("joins string messages and flattens primitive object attributes", () => {
+        expect(
+            toSentryLogPayload({
+                level: "info",
+                namespace: "API",
+                arguments: ["Cache warmed", { entries: 42, ok: true, nested: { a: 1 } }],
+                timestamp: new Date(),
+                environment: "production",
+                sendToSentryLogs: true,
+                sendToSentryIssue: false,
+                sendToConsole: false,
+            }),
+        ).toEqual({
+            message: "Cache warmed",
+            attributes: {
+                "logger.namespace": "API",
+                entries: 42,
+                ok: true,
+            },
+        });
+    });
+});
+
+describe("createSentrySink", () => {
+    it("captures errors as Issues with namespace and structured attributes", () => {
+        const { scope, sentry } = createFakeSentry();
         const logger = createLogger({
             environment: "production",
             namespace: "API",
             sinks: [createSentrySink(sentry)],
         });
         const error = new Error("offline");
-        logger.warn("ignored");
+        logger.warn("ignored without logs");
-        logger.sentry.info("Cache warmed");
         logger.error("Request failed", error, { requestId: "req_1" });
-        expect(sentry.captureMessage).toHaveBeenCalledWith("Cache warmed", "info");
         expect(sentry.captureException).toHaveBeenCalledWith(error);
-        expect(scope.setLevel).toHaveBeenCalledWith("info");
+        expect(sentry.captureMessage).not.toHaveBeenCalled();
+        expect(sentry.logger.info).not.toHaveBeenCalled();
+        expect(scope.setLevel).toHaveBeenCalledWith("error");
         expect(scope.setTag).toHaveBeenCalledWith("logger.namespace", "API");
-        expect(scope.setExtras).toHaveBeenCalledWith({ context_0: { requestId: "req_1" } });
+        expect(scope.setExtras).toHaveBeenCalledWith({
+            "logger.namespace": "API",
+            requestId: "req_1",
+        });
+    });
+
+    it("writes non-error events to Sentry Logs when enabled, not as Issues", () => {
+        const { sentry } = createFakeSentry();
+        const logger = createLogger({
+            environment: "production",
+            namespace: "API",
+            sinks: [createSentrySink(sentry, { logs: true })],
+        });
+        logger.warn("slow", { ms: 1200 });
+        logger.info("forced", { id: 1 }, { sentry: true });
+        expect(sentry.captureMessage).not.toHaveBeenCalled();
+        expect(sentry.captureException).not.toHaveBeenCalled();
+        expect(sentry.logger.warn).toHaveBeenCalledWith("slow", {
+            "logger.namespace": "API",
+            ms: 1200,
+        });
+        expect(sentry.logger.info).toHaveBeenCalledWith("forced", {
+            "logger.namespace": "API",
+            id: 1,
+        });
+    });
+
+    it("does not create an Issue when suppressSentry is set", () => {
+        const { sentry } = createFakeSentry();
+        const logger = createLogger({
+            environment: "production",
+            runtime: "node",
+            sinks: [createSentrySink(sentry, { logs: true })],
+        });
+        logger.error("expected", new Error("nope"), { suppressSentry: true });
+        expect(sentry.captureException).not.toHaveBeenCalled();
+        expect(sentry.logger.error).not.toHaveBeenCalled();
+    });
+
+    it("never sends in development", () => {
+        const { sentry } = createFakeSentry();
+        const logger = createLogger({
+            environment: "development",
+            sinks: [createSentrySink(sentry, { logs: true })],
+        });
+        logger.error("local", new Error("x"));
+        logger.warn("local warn", { sentry: true });
+        expect(sentry.captureException).not.toHaveBeenCalled();
+        expect(sentry.logger.warn).not.toHaveBeenCalled();
     });
 });

tsconfig.json

@@ -1,8 +1,8 @@
 {
     "compilerOptions": {
         "target": "ES2024",
-        "module": "NodeNext",
+        "module": "ESNext",
-        "moduleResolution": "NodeNext",
+        "moduleResolution": "bundler",
         "strict": true,
         "declaration": true,
         "verbatimModuleSyntax": true,