1 files changed, 79 insertions, 0 deletions
diff --git a/node_modules/webpack/lib/util/propertyName.js b/node_modules/webpack/lib/util/propertyName.js
new file mode 100644
index 00000000..ff512d48
--- /dev/null
+++ b/node_modules/webpack/lib/util/propertyName.js
@@ -0,0 +1,79 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const SAFE_IDENTIFIER = /^[_a-zA-Z$][_a-zA-Z$0-9]*$/;
+const RESERVED_IDENTIFIER = new Set([
+	"break",
+	"case",
+	"catch",
+	"class",
+	"const",
+	"continue",
+	"debugger",
+	"default",
+	"delete",
+	"do",
+	"else",
+	"export",
+	"extends",
+	"finally",
+	"for",
+	"function",
+	"if",
+	"import",
+	"in",
+	"instanceof",
+	"new",
+	"return",
+	"super",
+	"switch",
+	"this",
+	"throw",
+	"try",
+	"typeof",
+	"var",
+	"void",
+	"while",
+	"with",
+	"enum",
+	// strict mode
+	"implements",
+	"interface",
+	"let",
+	"package",
+	"private",
+	"protected",
+	"public",
+	"static",
+	"yield",
+	"yield",
+	// module code
+	"await",
+	// skip future reserved keywords defined under ES1 till ES3
+	// additional
+	"null",
+	"true",
+	"false"
+]);
+
+/**
+ * @summary Returns a valid JS property name for the given property.
+ * Certain strings like "default", "null", and names with whitespace are not
+ * valid JS property names, so they are returned as strings.
+ *
+ * @param {string} prop property name to analyze
+ * @returns {string} valid JS property name
+ */
+const propertyName = prop => {
+	if (SAFE_IDENTIFIER.test(prop) && !RESERVED_IDENTIFIER.has(prop)) {
+		return prop;
+	} else {
+		return JSON.stringify(prop);
+	}
+};
+
+module.exports = { SAFE_IDENTIFIER, RESERVED_IDENTIFIER, propertyName };