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node_modules/vinyl-fs/lib/symlink/prepare.js

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+'use strict';
+
+var path = require('path');
+
+var fs = require('graceful-fs');
+var Vinyl = require('vinyl');
+var through = require('through2');
+
+function prepareSymlink(folderResolver, optResolver) {
+  if (!folderResolver) {
+    throw new Error('Invalid output folder');
+  }
+
+  function normalize(file, enc, cb) {
+    if (!Vinyl.isVinyl(file)) {
+      return cb(new Error('Received a non-Vinyl object in `symlink()`'));
+    }
+
+    // TODO: Remove this after people upgrade vinyl/transition from gulp-util
+    if (typeof file.isSymbolic !== 'function') {
+      file = new Vinyl(file);
+    }
+
+    var cwd = path.resolve(optResolver.resolve('cwd', file));
+
+    var outFolderPath = folderResolver.resolve('outFolder', file);
+    if (!outFolderPath) {
+      return cb(new Error('Invalid output folder'));
+    }
+    var basePath = path.resolve(cwd, outFolderPath);
+    var writePath = path.resolve(basePath, file.relative);
+
+    // Wire up new properties
+    // Note: keep the target stats for now, we may need them in link-file
+    file.stat = (file.stat || new fs.Stats());
+    file.cwd = cwd;
+    file.base = basePath;
+    // This is the path we are linking *TO*
+    file.symlink = file.path;
+    file.path = writePath;
+    // We have to set contents to null for a link
+    // Otherwise `isSymbolic()` returns false
+    file.contents = null;
+
+    cb(null, file);
+  }
+
+  return through.obj(normalize);
+}
+
+module.exports = prepareSymlink;