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node_modules/url-join/lib/url-join.d.ts

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+/**
+ * Join all arguments together and normalize the resulting url.
+ * This works similar to `path.join` but you shouldn't use `path.join` for urls since it works
+ * differently depending on the operating system and also doesn't work for some cases.
+ */
+declare function urlJoin(...parts: string[]): string;
+declare function urlJoin(parts: string[]): string;
+ 
+export default urlJoin;

node_modules/url-join/lib/url-join.js

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+function normalize (strArray) {
+  var resultArray = [];
+  if (strArray.length === 0) { return ''; }
+
+  if (typeof strArray[0] !== 'string') {
+    throw new TypeError('Url must be a string. Received ' + strArray[0]);
+  }
+
+  // If the first part is a plain protocol, we combine it with the next part.
+  if (strArray[0].match(/^[^/:]+:\/*$/) && strArray.length > 1) {
+    var first = strArray.shift();
+    strArray[0] = first + strArray[0];
+  }
+
+  // There must be two or three slashes in the file protocol, two slashes in anything else.
+  if (strArray[0].match(/^file:\/\/\//)) {
+    strArray[0] = strArray[0].replace(/^([^/:]+):\/*/, '$1:///');
+  } else {
+    strArray[0] = strArray[0].replace(/^([^/:]+):\/*/, '$1://');
+  }
+
+  for (var i = 0; i < strArray.length; i++) {
+    var component = strArray[i];
+
+    if (typeof component !== 'string') {
+      throw new TypeError('Url must be a string. Received ' + component);
+    }
+
+    if (component === '') { continue; }
+
+    if (i > 0) {
+      // Removing the starting slashes for each component but the first.
+      component = component.replace(/^[\/]+/, '');
+    }
+    if (i < strArray.length - 1) {
+      // Removing the ending slashes for each component but the last.
+      component = component.replace(/[\/]+$/, '');
+    } else {
+      // For the last component we will combine multiple slashes to a single one.
+      component = component.replace(/[\/]+$/, '/');
+    }
+
+    resultArray.push(component);
+
+  }
+
+  var str = resultArray.join('/');
+  // Each input component is now separated by a single slash except the possible first plain protocol part.
+
+  // remove trailing slash before parameters or hash
+  str = str.replace(/\/(\?|&|#[^!])/g, '$1');
+
+  // replace ? in parameters with &
+  var parts = str.split('?');
+  str = parts.shift() + (parts.length > 0 ? '?': '') + parts.join('&');
+
+  return str;
+}
+
+export default function urlJoin() {
+  var input;
+
+  if (typeof arguments[0] === 'object') {
+    input = arguments[0];
+  } else {
+    input = [].slice.call(arguments);
+  }
+
+  return normalize(input);
+}