fix: put in real system logger (#177)

* fix: put in real system logger

* fix: mute system logs in netlify dev

Author: Skn0tt

src/run/systemlog.ts

@@ -1,61 +1 @@
-const systemLogTag = '__nfSystemLog'
-
-const serializeError = (error: Error): Record<string, unknown> => {
-  const cause = error?.cause instanceof Error ? serializeError(error.cause) : error.cause
-
-  return {
-    error: error.message,
-    error_cause: cause,
-    error_stack: error.stack,
-  }
-}
-
-export class StructuredLogger {
-  private fields: Record<string, unknown>
-  private message: string
-
-  constructor(message?: string, fields?: Record<string, unknown>) {
-    this.fields = fields ?? {}
-    this.message = message ?? ''
-  }
-
-  // TODO: add sampling
-  private doLog(logger: typeof console.log, message: string) {
-    logger(systemLogTag, JSON.stringify({ msg: message, fields: this.fields }))
-  }
-
-  log(message: string) {
-    this.doLog(console.log, message)
-  }
-
-  info(message: string) {
-    this.doLog(console.info, message)
-  }
-
-  debug(message: string) {
-    this.doLog(console.debug, message)
-  }
-
-  warn(message: string) {
-    this.doLog(console.warn, message)
-  }
-
-  error(message: string) {
-    this.doLog(console.error, message)
-  }
-
-  withError(error: unknown) {
-    const fields = error instanceof Error ? serializeError(error) : { error }
-
-    return this.withFields(fields)
-  }
-
-  withFields(fields: Record<string, unknown>) {
-    return new StructuredLogger(this.message, {
-      ...this.fields,
-      ...fields,
-    })
-  }
-}
-
-export const logger = new StructuredLogger()
+export { systemLogger as logger, LogLevel } from '@netlify/functions/dist/internal.js'