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utils.ts
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utils.ts
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import { correctExtension, ImageRatioClass } from "../types/imageRouter";
import { extname, basename } from "path";
import os from "os";
export function isCorrectExtension(
fileExtension: unknown
): fileExtension is correctExtension {
const extensions = ["avif", "webp", "jpeg", "png", "jxl"];
return extensions.includes(fileExtension as string);
}
export function getImageClasses({
width,
height,
targetRatio,
ratioDiffThreshold,
}: {
width: number;
height: number;
targetRatio: number;
ratioDiffThreshold: number;
}): ImageRatioClass[] {
const classes: ImageRatioClass[] = [];
if (width > height) {
classes.push("horizontal", "landscape");
} else if (width === height) classes.push("square");
else classes.push("vertical", "portrait");
const ratio = width / height;
const ratioDifference = ratio - targetRatio;
if (Math.abs(ratioDifference) > ratioDiffThreshold) {
classes.push("ratio-crossed-threshold");
if (ratioDifference > 0) classes.push("ratio-above-threshold");
else classes.push("ratio-below-threshold");
}
return classes;
}
export function encodeFilename({
width,
originalPath,
extension,
}: {
width: number;
originalPath: string;
extension: string;
}): string {
const filename = basename(originalPath)
.slice(0, -1 * extname(originalPath).length)
.replace(/\./g, "_");
return `${filename || "image"}.${width}.${extension}`;
}
export function checkMaxConcurrent(maxConcurrent?: number): number {
const availableCpus = os.cpus().length;
const maxConcurrentWithOneFree = availableCpus > 1 ? availableCpus - 1 : 1;
const suggestedMaxConcurrent =
maxConcurrent !== undefined
? Math.min(maxConcurrent, maxConcurrentWithOneFree)
: maxConcurrentWithOneFree;
if (maxConcurrent !== undefined && maxConcurrent > suggestedMaxConcurrent) {
console.warn(
`Warning: The specified maxConcurrent (${maxConcurrent}) exceeds the recommended limit (${suggestedMaxConcurrent}). Using ${suggestedMaxConcurrent} instead.`
);
return suggestedMaxConcurrent;
} else {
return maxConcurrent !== undefined
? maxConcurrent
: suggestedMaxConcurrent;
}
}

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