feat(runtime): add `WorkerLogLevel` (#19316)

This is not really used yet, but provides some infrastructure for doing
more fine grained logging in JS. I will add warn messages in a future
PR.

2 files changed, 20 insertions, 11 deletions

diff --git a/runtime/js/06_util.js b/runtime/js/06_util.js
index e04ae7bd7..971957b7e 100644
--- a/runtime/js/06_util.js
+++ b/runtime/js/06_util.js
@@ -5,18 +5,27 @@ const {
   Promise,
   SafeArrayIterator,
 } = primordials;
-let logDebug = false;
+
+// WARNING: Keep this in sync with Rust (search for LogLevel)
+const LogLevel = {
+  Error: 1,
+  Warn: 2,
+  Info: 3,
+  Debug: 4,
+};
+
+let logLevel = 3;
 let logSource = "JS";
 
-function setLogDebug(debug, source) {
-  logDebug = debug;
+function setLogLevel(level, source) {
+  logLevel = level;
   if (source) {
     logSource = source;
   }
 }
 
 function log(...args) {
-  if (logDebug) {
+  if (logLevel >= LogLevel.Debug) {
     // if we destructure `console` off `globalThis` too early, we don't bind to
     // the right console, therefore we don't log anything out.
     globalThis.console.error(
@@ -80,6 +89,6 @@ export {
   log,
   nonEnumerable,
   readOnly,
-  setLogDebug,
+  setLogLevel,
   writable,
 };
diff --git a/runtime/js/99_main.js b/runtime/js/99_main.js
index 91d34272f..8fd9a6bd9 100644
--- a/runtime/js/99_main.js
+++ b/runtime/js/99_main.js
@@ -299,7 +299,7 @@ function runtimeStart(
   v8Version,
   tsVersion,
   target,
-  debugFlag,
+  logLevel,
   noColor,
   isTty,
   source,
@@ -315,7 +315,7 @@ function runtimeStart(
     tsVersion,
   );
   core.setBuildInfo(target);
-  util.setLogDebug(debugFlag, source);
+  util.setLogLevel(logLevel, source);
   setNoColor(noColor || !isTty);
   // deno-lint-ignore prefer-primordials
   Error.prepareStackTrace = core.prepareStackTrace;
@@ -428,7 +428,7 @@ function bootstrapMainRuntime(runtimeOptions) {
   const {
     0: args,
     1: cpuCount,
-    2: debugFlag,
+    2: logLevel,
     3: denoVersion,
     4: locale,
     5: location_,
@@ -495,7 +495,7 @@ function bootstrapMainRuntime(runtimeOptions) {
     v8Version,
     tsVersion,
     target,
-    debugFlag,
+    logLevel,
     noColor,
     isTty,
   );
@@ -542,7 +542,7 @@ function bootstrapWorkerRuntime(
   const {
     0: args,
     1: cpuCount,
-    2: debugFlag,
+    2: logLevel,
     3: denoVersion,
     4: locale,
     5: location_,
@@ -610,7 +610,7 @@ function bootstrapWorkerRuntime(
     v8Version,
     tsVersion,
     target,
-    debugFlag,
+    logLevel,
     noColor,
     isTty,
     internalName ?? name,