import { W2XCJS, DEFAULT_MODELS_DIR } from 'waifu2x-node';

const converter = new W2XCJS();

const err = converter.loadModels(DEFAULT_MODELS_DIR);

if (!err) {
    const conv_err = converter.convertFile("in.png", "out.webp");
    if (!err) {
        console.log('File converted successfully');
    }
}

import { W2XCJS, DEFAULT_MODELS_DIR } from 'waifu2x-node';
import fs from 'fs';

const converter = new W2XCJS();

const err = converter.loadModels(DEFAULT_MODELS_DIR);

if (!err) {
    const input_buffer = fs.readFileSync("in.png");
    const output_buffer = converter.convertBuffer(input_buffer, '.JPG'); // second parameter is the file extension to encode to.
    fs.writeFileSync("out.jpg", output_buffer);
}

import { W2XCJS, DEFAULT_MODELS_DIR } from 'waifu2x-node';
import fs from 'fs';

const converter = new W2XCJS();

const err = converter.loadModels(DEFAULT_MODELS_DIR); // model loading is synchronous

if (!err) {
    fs.readFile("in.png", (err, input_buffer) => {
        if (err) throw err;
        converter.convertBufferAsync(input_buffer, '.WEBP', { /* AsyncOptions */ }, dst_buffer => {
            fs.writeFile("out.webp", dst_buffer, err => {
                if (err) throw err;
            })
        })
    });
}

import { W2XCJS, DEFAULT_MODELS_DIR, W2XCJSPromises } from 'waifu2x-node';
import fs from 'fs';

const promises = new W2XCJSPromises(new W2XCJS());

const err = promises.converter.loadModels(DEFAULT_MODELS_DIR); // model loading is synchronous

if (!err) {
    (async () => {
        const input_buffer = await fs.promises.readFile("in.png");
        const dst_buffer = await promises.convertBuffer(input_buffer, '.WEBP', { /* AsyncOptions */ });
        await fs.promises.writeFile("out.webp", dst_buffer);
    })();
}

interface AsyncOptions {
    // encoding options for destination buffer.
    imwrite_params: ImwriteParams;
    // denoising options (number value from -1 to 3 where -1 is no denoising)
    denoise_level: DenoiseLevel;
    // Scale factor.
    scale: number;
}

interface ImwriteParams {
    // quality factor for webp and jpeg from 0 to 101 where 101 is lossless.
    webp_quality?: number;
    jpeg_quality?: number;
    // compression factor for png from 0 to 9 where 9 is smallest size and longest time.
    png_compression?: number;
}