ubdate

node_modules/imagemin-optipng/index.js

@@ -0,0 +1,57 @@
+'use strict';
+const execBuffer = require('exec-buffer');
+const isPng = require('is-png');
+const optipng = require('optipng-bin');
+
+module.exports = options => async buffer => {
+	options = {
+		optimizationLevel: 3,
+		bitDepthReduction: true,
+		colorTypeReduction: true,
+		paletteReduction: true,
+		errorRecovery: true,
+		...options
+	};
+
+	if (!Buffer.isBuffer(buffer)) {
+		throw new TypeError('Expected a buffer');
+	}
+
+	if (!isPng(buffer)) {
+		return buffer;
+	}
+
+	const arguments_ = [
+		'-strip',
+		'all',
+		'-clobber',
+		'-o',
+		options.optimizationLevel,
+		'-out',
+		execBuffer.output
+	];
+
+	if (options.errorRecovery) {
+		arguments_.push('-fix');
+	}
+
+	if (!options.bitDepthReduction) {
+		arguments_.push('-nb');
+	}
+
+	if (!options.colorTypeReduction) {
+		arguments_.push('-nc');
+	}
+
+	if (!options.paletteReduction) {
+		arguments_.push('-np');
+	}
+
+	arguments_.push(execBuffer.input);
+
+	return execBuffer({
+		input: buffer,
+		bin: optipng,
+		args: arguments_
+	});
+};