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import fs from 'fs';
import path from 'path';
import { shorthash } from './shorthash.js';
import type { OutputFormat, TransformOptions } from './types';
export function isOutputFormat(value: string): value is OutputFormat {
return ['avif', 'jpeg', 'png', 'webp'].includes(value);
}
export function isAspectRatioString(value: string): value is `${number}:${number}` {
return /^\d*:\d*$/.test(value);
}
export function ensureDir(dir: string) {
fs.mkdirSync(dir, { recursive: true });
}
export function isRemoteImage(src: string) {
return /^http(s?):\/\//.test(src);
}
export async function loadLocalImage(src: string) {
try {
return await fs.promises.readFile(src);
} catch {
return undefined;
}
}
export async function loadRemoteImage(src: string) {
try {
const res = await fetch(src);
if (!res.ok) {
return undefined;
}
return Buffer.from(await res.arrayBuffer());
} catch {
return undefined;
}
}
export async function loadImage(src: string) {
return isRemoteImage(src) ? await loadRemoteImage(src) : await loadLocalImage(src);
}
export function propsToFilename({ src, width, height, format }: TransformOptions) {
const ext = path.extname(src);
let filename = src.replace(ext, '');
// for remote images, add a hash of the full URL to dedupe images with the same filename
if (isRemoteImage(src)) {
filename += `-${shorthash(src)}`;
}
if (width && height) {
return `${filename}_${width}x${height}.${format}`;
} else if (width) {
return `${filename}_${width}w.${format}`;
} else if (height) {
return `${filename}_${height}h.${format}`;
}
return format ? src.replace(ext, format) : src;
}
export function parseAspectRatio(aspectRatio: TransformOptions['aspectRatio']) {
if (!aspectRatio) {
return undefined;
}
// parse aspect ratio strings, if required (ex: "16:9")
if (typeof aspectRatio === 'number') {
return aspectRatio;
} else {
const [width, height] = aspectRatio.split(':');
return parseInt(width) / parseInt(height);
}
}
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