deps: upgrade npm to 6.1.0

PR-URL: https://github.com/nodejs/node/pull/20190
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/deps/npm/node_modules/string-width/index.js b/deps/npm/node_modules/string-width/index.js
new file mode 100644
index 0000000000..bbc49d29b1
--- /dev/null
+++ b/deps/npm/node_modules/string-width/index.js
@@ -0,0 +1,36 @@
+'use strict';
+const stripAnsi = require('strip-ansi');
+const isFullwidthCodePoint = require('is-fullwidth-code-point');
+
+module.exports = str => {
+	if (typeof str !== 'string' || str.length === 0) {
+		return 0;
+	}
+
+	str = stripAnsi(str);
+
+	let width = 0;
+
+	for (let i = 0; i < str.length; i++) {
+		const code = str.codePointAt(i);
+
+		// Ignore control characters
+		if (code <= 0x1F || (code >= 0x7F && code <= 0x9F)) {
+			continue;
+		}
+
+		// Ignore combining characters
+		if (code >= 0x300 && code <= 0x36F) {
+			continue;
+		}
+
+		// Surrogates
+		if (code > 0xFFFF) {
+			i++;
+		}
+
+		width += isFullwidthCodePoint(code) ? 2 : 1;
+	}
+
+	return width;
+};