51 lines
1.3 KiB
TypeScript
51 lines
1.3 KiB
TypeScript
import { EventEmitter } from "https://deno.land/x/evtemitter@v3.0.0/mod.ts";
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enum LOG_LEVEL {
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DEBUG = 0,
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INFO = 1,
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WARN = 2,
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ERROR = 3,
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}
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const logFuncs = {
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[LOG_LEVEL.DEBUG]: console.debug,
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[LOG_LEVEL.INFO]: console.info,
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[LOG_LEVEL.WARN]: console.warn,
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[LOG_LEVEL.ERROR]: console.error,
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} as const;
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let longestScope = 0;
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let logLevel = LOG_LEVEL.WARN;
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const ee = new EventEmitter<{
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log: { level: LOG_LEVEL; scope: string; args: unknown[] };
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}>();
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export function setLogLevel(level: LOG_LEVEL) {
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logLevel = level;
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}
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type LoggerOptions = {
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enabled?: boolean;
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};
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const createLogFunction =
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(scope: string, level: LOG_LEVEL) => (...data: unknown[]) => {
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ee.emit("log", { level, scope, args: data });
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if (level <= logLevel) return;
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logFuncs[level](`[${scope.padEnd(longestScope, " ")}]`, ...data);
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};
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export function createLogger(scope: string, _options?: LoggerOptions) {
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longestScope = Math.max(scope.length, longestScope);
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return {
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debug: createLogFunction(scope, LOG_LEVEL.DEBUG),
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info: createLogFunction(scope, LOG_LEVEL.INFO),
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error: createLogFunction(scope, LOG_LEVEL.ERROR),
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warn: createLogFunction(scope, LOG_LEVEL.WARN),
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addEventListener:
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((type, cb) =>
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ee.addEventListener(type, cb)) as typeof ee.addEventListener,
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};
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}
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