@azure/functions/src/utils/workerSystemLog.ts

Microsoft Azure Functions NodeJS Framework

// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the MIT License.

import * as types from '@azure/functions';
import { format } from 'util';
import { fallbackLogHandler } from './fallbackLogHandler';
import { tryGetCoreApiLazy } from './tryGetCoreApiLazy';

export function workerSystemLog(level: types.LogLevel, ...args: unknown[]): void {
    const coreApi = tryGetCoreApiLazy();
    // NOTE: coreApi.log doesn't exist on older versions of the worker
    if (coreApi && coreApi.log) {
        coreApi.log(level, 'system', format(...args));
    } else {
        fallbackLogHandler(level, ...args);
    }
}