自定义日志级别时，TS使用自定级别记录日志报错

[lianjl256]

当定义了一个日志级别时：
例如：
log4js.levels.addLevels({
KEY: {
value: 30001,
colour: 'yellow'
}
})
再使用新的级别记录日志：
logger._log('KEY', ‘测试关键日志’);
会报错：
categoryAppenders.forEach(appender => {
^
TypeError: eventLevel.isGreaterThanOrEqualTo is not a function

导致这个原因是在log4js.d.ts这样定义_log方法的：
_log(level: string, data: any): void;

应该改成：
_log(level: Level, data: any): void;
然后使用以下方法记录相应的日志
logger._log(log4js.levels.getLevel('KEY'), "测试关键日志’")

[lamweili]

Fixed in log4js@6.4.0.

[lamweili]

In any case, you should be using log and not _log.
It does additional checks for isLevelEnabled before proceeding further to _log (non-public).

log4js-node/types/log4js.d.ts

Line 346 in 2d52eb4

log(level: Level | string, ...args: any[]): void;

log4js-node/lib/logger.js

Lines 71 to 80 in 2d52eb4

	log(level, ...args) {
	let logLevel = levels.getLevel(level);
	if (!logLevel) {
	this._log(levels.WARN, 'log4js:logger.log: invalid value for log-level as first parameter given: ', level);
	logLevel = levels.INFO;
	}
	if (this.isLevelEnabled(logLevel)) {
	this._log(logLevel, args);
	}
	}