first commit

build/node_modules/imagemin-advpng/index.js

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+'use strict';
+const execBuffer = require('exec-buffer');
+const advpng = require('advpng-bin');
+const isPng = require('is-png');
+const tempfile = require('tempfile');
+
+module.exports = opts => buf => {
+	opts = Object.assign({optimizationLevel: 3}, opts);
+
+	if (!Buffer.isBuffer(buf)) {
+		return Promise.reject(new TypeError(`Expected a \`Buffer\`, got \`${typeof buf}\``));
+	}
+
+	if (!isPng(buf)) {
+		return Promise.resolve(buf);
+	}
+
+	const args = ['--recompress', '-q'];
+	const tmp = tempfile();
+
+	if (typeof opts.optimizationLevel === 'number') {
+		args.push(`-${opts.optimizationLevel}`);
+	}
+
+	args.push(execBuffer.input);
+
+	return execBuffer({
+		input: buf,
+		bin: advpng,
+		args,
+		inputPath: tmp,
+		outputPath: tmp
+	}).catch(err => {
+		err.message = err.stderr || err.message;
+		throw err;
+	});
+};