Add type definition for logger (#36769)

types/logger/index.d.ts

@@ -0,0 +1,25 @@
+// Type definitions for logger 0.0
+// Project: http://github.com/quirkey/node-logger
+// Definitions by: Max Wan <https://github.com/maxwan>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export function createLogger(logFilePath?: string): Logger;
+
+export type LogLevel = 'fatal' | 'error' | 'warn' | 'info' | 'debug';
+export type Args = (...args: string[]) => string | false;
+
+export class Logger {
+    constructor(logFilePath?: string);
+    format: (level: LogLevel, data: string, message: string) => string;
+    setLevel: (level: LogLevel) => number | false;
+    log: (level: LogLevel, ...args: string[]) => string | false;
+    fatal: Args;
+    error: Args;
+    warn: Args;
+    info: Args;
+    debug: Args;
+}
+
+export namespace Logger {
+    const levels: ['fatal', 'error', 'warn', 'info', 'debug'];
+}

types/logger/logger-tests.ts

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+import { Logger, createLogger } from 'logger';
+
+const logToSTDOUT = createLogger(); // $ExpectType Logger
+logToSTDOUT.format('debug', 'date', 'message'); // $ExpectType string
+logToSTDOUT.setLevel('fatal'); // $ExpectType number | false
+logToSTDOUT.log('info', 'text1', 'text2', 'text3'); // $ExpectType string | false
+logToSTDOUT.fatal('fatal', 'text1', 'text2', 'text3', 'text4', 'text5'); // $ExpectType string | false
+logToSTDOUT.error('error', 'text1', 'text2', 'text3', 'text4'); // $ExpectType string | false
+logToSTDOUT.warn('warn', 'text1', 'text2', 'text3'); // $ExpectType string | false
+logToSTDOUT.info('info', 'text1', 'text2'); // $ExpectType string | false
+logToSTDOUT.debug('debug', 'text1'); // $ExpectType string | false
+
+createLogger('test.log'); // $ExpectType Logger
+
+new Logger(); // $ExpectType Logger
+new Logger('test.log'); // $ExpectType Logger
+
+Logger.levels[0]; // $ExpectType "fatal"
+Logger.levels[1]; // $ExpectType "error"
+Logger.levels[2]; // $ExpectType "warn"
+Logger.levels[3]; // $ExpectType "info"
+Logger.levels[4]; // $ExpectType "debug"

types/logger/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "logger-tests.ts"
+    ]
+}

types/logger/tslint.json

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+{ "extends": "dtslint/dt.json" }