ansispeck

~2 KB (gzipped) terminal ANSI color formatting with explicit entrypoints.

Size

| Package | Runtime | Gzipped | Types | | ------------- | ----------- | ------- | ------- | | ansispeck[^1] | 4.05 KB | 1.79 KB | 9.03 KB |

[^1]: Default entry's full import chain (entry + shared chunks), minified by tsdown;
measured by scripts/compare-size.sh, regenerated at release.

Benchmarks

See BENCHMARKS for full results across Bun and Node.

Install

npm install ansispeck

Usage

import c from "ansispeck";

console.log(c.red("Error!"));
console.log(c.bold(c.green("Success")));
console.log(c.bgYellow(c.black("Warning")));

Explicit toggle

import { createColors } from "ansispeck";

const c = createColors(false); // force disable
console.log(c.red("plain text"));

Entrypoints

| Import | Behavior | | ---------------- | --------------------------------------------------------------------- | | ansispeck | Auto-detected color support (alias: ansispeck/auto) | | ansispeck/raw | Always emits ANSI codes | | ansispeck/noop | Never emits codes — plain string coercion | | ansispeck/safe | Template tags that re-open styles across interpolations (leak-proof) | | ansispeck/rope | Chunk/rope builders — O(1) styled composition, O(n) structural render |

All plain-formatter entrypoints (auto/raw/noop) share nesting-safe close-code replacement, so composed styles never leak.

safe

import { red, bold } from "ansispeck/safe";

const user = "wo\x1b[39mrld"; // hostile input cannot break the style
console.log(red`hello ${user}!`);
console.log(bold`${red`nested`} works too`);

rope

import { red, blue, concat, render } from "ansispeck/rope";

const chunk = red(concat("a", blue("b"), "c")); // O(1), no string scans
console.log(render(chunk)); // re-opens red after blue closes — structurally

API

All formatters accept string | number | null | undefined and return string.

Styles

reset bold dim italic underline inverse hidden strikethrough overline doubleUnderline blink

Colors

black red green yellow blue magenta cyan white gray

Bright colors

blackBright redBright greenBright yellowBright blueBright magentaBright cyanBright whiteBright

Background

bgBlack bgRed bgGreen bgYellow bgBlue bgMagenta bgCyan bgWhite

Bright background

bgBlackBright bgRedBright bgGreenBright bgYellowBright bgBlueBright bgMagentaBright bgCyanBright bgWhiteBright

256-color and truecolor

c.fg256(208)("orange"); // \x1b[38;5;208m
c.bg256(17)("navy bg"); // \x1b[48;5;17m
c.rgb(255, 136, 0)("orange"); // \x1b[38;2;255;136;0m
c.bgRgb(0, 0, 0)("black bg");
c.hex("#ff8800")("orange"); // #rgb and #rrggbb, # optional
c.bgHex("#f80")("orange bg");

Links

• link(url, text?) — OSC 8 terminal hyperlink, accepts string | URL, text defaults to the URL; also usable as a template tag

import { pathToFileURL } from "node:url";

console.log(c.link("https://example.com", "docs"));
console.log(c.link(pathToFileURL("README.md"), "readme")); // file:// out of the box
console.log(c.link`https://example.com/issues/${42}`); // template tag, text = url

Hyperlink emission is gated independently of color (see Detection): with links off, link returns its text plain, so an omitted label degrades to the destination URL.

Other exports

• createColors(enabled?, hyperlinksEnabled?) — create a color set; hyperlinksEnabled defaults to enabled
• createSafeColors(enabled?, hyperlinksEnabled?) (from ansispeck/safe) — template-tag color set
• createRope(enabled?) (from ansispeck/rope) — rope color set
• isColorSupported / isHyperlinkSupported — auto-detected booleans
• detectColorSupport() / detectHyperlinkSupport() — run detection on demand
• strip(input) — remove all ANSI SGR and OSC sequences

Detection

Color respects NO_COLOR, FORCE_COLOR, --no-color, --color, CI, and TTY status.
Explicit force (FORCE_COLOR/--color) beats explicit disable (NO_COLOR/--no-color), which beats platform heuristics.

Hyperlinks are detected separately — OSC 8 support is orthogonal to SGR color — per the no-hyperlinks convention: NO_HYPERLINKS / --no-hyperlinks beats FORCE_HYPERLINKS / --hyperlinks, which beats TTY status. Non-interactive streams get no links.

License

0BSD