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diff --git a/org.simantics.maps.server/node/node-v4.8.0-win-x64/node_modules/npm/node_modules/umask/index.js b/org.simantics.maps.server/node/node-v4.8.0-win-x64/node_modules/npm/node_modules/umask/index.js
new file mode 100644
index 00000000..501c0e0c
--- /dev/null
+++ b/org.simantics.maps.server/node/node-v4.8.0-win-x64/node_modules/npm/node_modules/umask/index.js
@@ -0,0 +1,77 @@
+'use strict';
+
+var util = require("util");
+
+function toString(val) {
+    val = val.toString(8);
+    while (val.length < 4) {
+        val = "0" + val;
+    }
+    return val;
+}
+
+var defaultUmask = 18; // 0022;
+var defaultUmaskString = toString(defaultUmask);
+
+function validate(data, k, val) {
+    // must be either an integer or an octal string.
+    if (typeof val === "number" && !isNaN(val)) {
+        data[k] = val;
+        return true;
+    }
+
+    if (typeof val === "string") {
+        if (val.charAt(0) !== "0") {
+            return false;
+        }
+        data[k] = parseInt(val, 8);
+        return true;
+    }
+
+    return false;
+}
+
+function convert_fromString(val, cb) {
+    if (typeof val === "string") {
+        // check for octal string first
+        if (val.charAt(0) === '0' && /^[0-7]+$/.test(val)) {
+            val = parseInt(val, 8);
+        } else if (val.charAt(0) !== '0' && /^[0-9]+$/.test(val)) {
+            // legacy support for decimal strings
+            val = parseInt(val, 10);
+        } else {
+            return cb(new Error(util.format("Expected octal string, got %j, defaulting to %j",
+                                            val, defaultUmaskString)),
+                      defaultUmask);
+        }
+    } else if (typeof val !== "number") {
+        return cb(new Error(util.format("Expected number or octal string, got %j, defaulting to %j",
+                                        val, defaultUmaskString)),
+                  defaultUmask);
+    }
+
+    val = Math.floor(val);
+
+    if ((val < 0) || (val > 511)) {
+        return cb(new Error(util.format("Must be in range 0..511 (0000..0777), got %j", val)),
+                  defaultUmask);
+    }
+
+    cb(null, val);
+}
+
+function fromString(val, cb) {
+
+    // synchronous callback, no zalgo
+    convert_fromString(val, cb || function (err, result) {
+        /*jslint unparam:true*/
+        val = result;
+    });
+
+    return val;
+}
+
+exports.toString = toString;
+exports.fromString = fromString;
+exports.validate = validate;
+