| |
|
|
| export const LogLevel = { NONE: "NONE", ERROR: "ERROR", WARN: "WARN", DEBUG: "DEBUG", ALL: "ALL" } as const; |
|
|
| const LogLevelNumber = { NONE: 0, ERROR: 1, WARN: 2, DEBUG: 3, ALL: 4 } as const; |
|
|
| export interface LoggerOptions { |
| prefix?: string; |
| level?: keyof typeof LogLevel; |
| showLevel?: boolean; |
| } |
|
|
| export class Logger { |
| protected prefix: string; |
| protected level: keyof typeof LogLevel; |
| protected showLevel: boolean; |
|
|
| private levelNumber: number; |
|
|
| constructor({ prefix = "", level = LogLevel.ALL, showLevel = true }: LoggerOptions) { |
| this.prefix = prefix; |
| this.level = level; |
| this.levelNumber = LogLevelNumber[this.level]; |
| this.showLevel = showLevel; |
| } |
|
|
| debug = (...args: unknown[]): void => { |
| if (this.canWrite(LogLevel.DEBUG)) { |
| this.write(LogLevel.DEBUG, ...args); |
| } |
| }; |
|
|
| warn = (...args: unknown[]): void => { |
| if (this.canWrite(LogLevel.WARN)) { |
| this.write(LogLevel.WARN, ...args); |
| } |
| }; |
|
|
| error = (...args: unknown[]): void => { |
| if (this.canWrite(LogLevel.ERROR)) { |
| this.write(LogLevel.ERROR, ...args); |
| } |
| }; |
|
|
| private canWrite(level: keyof typeof LogLevel): boolean { |
| return this.levelNumber >= LogLevelNumber[level]; |
| } |
|
|
| private write(level: keyof typeof LogLevel, ...args: unknown[]): void { |
| let prefix = this.prefix; |
|
|
| if (this.showLevel) { |
| prefix = `- ${level} ${prefix}`; |
| } |
|
|
| if (level === LogLevel.ERROR) { |
| console.error(prefix, ...args); |
| } else { |
| console.log(prefix, ...args); |
| } |
| } |
| } |
|
|
| |
| |
|
|
| export function createLogger({ prefix, level }: LoggerOptions = {}): Logger { |
| return new Logger({ prefix, level }); |
| } |
|
|
