Use 'import type' for type-only imports in logger

Refactored imports in FileSink.ts, TextFormatter.ts, and defaults.ts to use 'import type' for type-only imports. This improves clarity and may help with tree-shaking and type checking.

Author: WilliamRagstad

src/logger/FileSink.ts

@@ -1,4 +1,4 @@
-import {
+import type {
   LoggingLevel,
   MessageTemplateParams,
   TimestampProvider,
@@ -7,7 +7,7 @@ import { defaultTimestamp } from "./defaults.ts";
 import { Sink } from "./Sink.ts";
 import { ensureFileSync } from "@std/fs";
 import { TextFormatter } from "./TextFormatter.ts";
-import { Formatter } from "./Formatter.ts";
+import type { Formatter } from "./Formatter.ts";
 export class FileSink extends Sink {
   private _filepath: string;
   constructor(

src/logger/TextFormatter.ts

@@ -6,7 +6,7 @@ import {
   defaultParamColorOptions,
   defaultTimestampColorOption,
 } from "./defaults.ts";
-import { Formatter, LoggingFormatterData } from "./Formatter.ts";
+import { Formatter, type LoggingFormatterData } from "./Formatter.ts";
 import { compileMessage } from "./parser.ts";
 
 function spacingUntil(current: number, length: number): string {

src/logger/defaults.ts

@@ -13,7 +13,7 @@ import {
   white,
   yellow,
 } from "@std/fmt/colors";
-import { ColorFunction, LevelColors, ParamColors } from "./TextFormatter.ts";
+import type { ColorFunction, LevelColors, ParamColors } from "./TextFormatter.ts";
 
 /**
  * Default color options for the `ConsoleSink` class.