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'use strict';
const execa = require('execa');
const isPng = require('is-png');
const isStream = require('is-stream');
const pngquant = require('pngquant-bin');
const ow = require('ow');
const imageminPngquant = (options = {}) => input => {
const isBuffer = Buffer.isBuffer(input);
if (!isBuffer && !isStream(input)) {
return Promise.reject(new TypeError(`Expected a Buffer or Stream, got ${typeof input}`));
}
if (isBuffer && !isPng(input)) {
return Promise.resolve(input);
}
const args = ['-'];
if (typeof options.speed !== 'undefined') {
ow(options.speed, ow.number.integer.inRange(1, 11));
args.push('--speed', options.speed);
}
if (typeof options.strip !== 'undefined') {
ow(options.strip, ow.boolean);
if (options.strip) {
args.push('--strip');
}
}
if (typeof options.quality !== 'undefined') {
ow(options.quality, ow.array.length(2).ofType(ow.number.inRange(0, 1)));
const [min, max] = options.quality;
args.push('--quality', `${Math.round(min * 100)}-${Math.round(max * 100)}`);
}
if (typeof options.dithering !== 'undefined') {
ow(options.dithering, ow.any(ow.number.inRange(0, 1), ow.boolean.false));
if (typeof options.dithering === 'number') {
args.push(`--floyd=${options.dithering}`);
} else if (options.dithering === false) {
args.push('--ordered');
}
}
if (typeof options.posterize !== 'undefined') {
ow(options.posterize, ow.number);
args.push('--posterize', options.posterize);
}
if (typeof options.verbose !== 'undefined') {
ow(options.verbose, ow.boolean);
args.push('--verbose');
}
const subprocess = execa(pngquant, args, {
encoding: null,
maxBuffer: Infinity,
input
});
const promise = subprocess
.then(result => result.stdout) // eslint-disable-line promise/prefer-await-to-then
.catch(error => {
// We use `error.exitCode` to check for a special condition when running the pngquant binary.
// See details on handling of "99" code at https://pngquant.org (search for "status code 99").
if (error.exitCode === 99) {
return input;
}
error.message = error.stderr || error.message;
throw error;
});
subprocess.stdout.then = promise.then.bind(promise); // eslint-disable-line promise/prefer-await-to-then
subprocess.stdout.catch = promise.catch.bind(promise);
return subprocess.stdout;
};
module.exports = imageminPngquant;
module.exports.default = imageminPngquant;