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refactor: color text with Node's util.styleText #69

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Merged
fvsch merged 1 commit into from
Aug 3, 2026
Merged

refactor: color text with Node's util.styleText #69

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33 changes: 12 additions & 21 deletions src/logger.ts
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
import { release } from 'node:os';
import { platform } from 'node:process';
import { type Writable } from 'node:stream';
import { inspect } from 'node:util';
import { inspect, styleText } from 'node:util';

import type { ResMetaData } from './types.d.ts';
import { clamp, fwdSlash, getEnv, getRuntime, trimSlash, withResolvers } from './utils.ts';
Expand Down Expand Up @@ -32,15 +32,21 @@ export class ColorUtils {
return parts.join('');
}
const formats = format.split(',');
return parts
.map((part, index) => (formats[index] ? this.style(part, formats[index]) : part))
.join('');
return parts.map((part, i) => this.style(part, formats[i])).join('');
};

style = (text: string, format: string = ''): string => {
if (!this.enabled) return text;
return styleText(format.trim().split(/\s+/g), text);
if (!format || !this.enabled) return text;
return styleText(this.#stFormat(format), text, { validateStream: false });
};

#stFormat(format: string): Parameters<typeof styleText>[0] {
const fmt = format
.trim()
.split(/\s+/g)
.filter((s) => Object.hasOwn(inspect.colors, s));
return fmt as any[];
}
}

export class Logger {
Expand Down Expand Up @@ -155,21 +161,6 @@ function pathSuffix(urlPath: string, localPath: string): [string, string] | unde
}
}

/**
Basic implementation of 'node:util' styleText to support Node 18 + Deno.
*/
function styleText(format: string | string[], text: string): string {
let before = '';
let after = '';
for (const style of Array.isArray(format) ? format : [format]) {
const codes = inspect.colors[style.trim()];
if (!codes) continue;
before = `${before}\x1b[${codes[0]}m`;
after = `\x1b[${codes[1]}m${after}`;
}
return `${before}${text}${after}`;
}

function supportsColor(): boolean {
// Avoid reading env variables in Deno to limit prompts;
// instead rely on its built-in parsing of the NO_COLOR env variable
Expand Down