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node_modules/node-sass/scripts/install.js

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+/*!
+ * node-sass: scripts/install.js
+ */
+
+var fs = require('fs'),
+  eol = require('os').EOL,
+  path = require('path'),
+  fetch = require('make-fetch-happen'),
+  sass = require('../lib/extensions'),
+  downloadOptions = require('./util/downloadoptions');
+
+/**
+ * Download file, if succeeds save, if not delete
+ *
+ * @param {String} url
+ * @param {String} dest
+ * @param {Function} cb
+ * @api private
+ */
+
+function download(url, dest, cb) {
+  var reportError = function(err) {
+    cb(['Cannot download "', url, '": ', eol, eol,
+      typeof err.message === 'string' ? err.message : err, eol, eol,
+      'Hint: If github.com is not accessible in your location', eol,
+      '      try setting a proxy via HTTP_PROXY, e.g. ', eol, eol,
+      '      export HTTP_PROXY=http://example.com:1234',eol, eol,
+      'or configure npm proxy via', eol, eol,
+      '      npm config set proxy http://example.com:8080'].join(''));
+  };
+
+  var successful = function(response) {
+    return response.status >= 200 && response.status < 300;
+  };
+
+  console.log('Downloading binary from', url);
+
+  try {
+    fetch(url, downloadOptions()).then(function (response) {
+      return response.buffer();
+    }).then(function (buffer) {
+      fs.createWriteStream(dest).on('error', cb).end(buffer, cb);
+      console.log('Download complete');
+    }).catch(function(err) {
+      if(!successful(err)) {
+        reportError(['HTTP error', err.code, err.message].join(' '));
+      } else {
+        reportError(err);
+      }
+    });
+  } catch (err) {
+    cb(err);
+  }
+}
+
+/**
+ * Check and download binary
+ *
+ * @api private
+ */
+
+function checkAndDownloadBinary() {
+  if (process.env.SKIP_SASS_BINARY_DOWNLOAD_FOR_CI) {
+    console.log('Skipping downloading binaries on CI builds');
+    return;
+  }
+
+  var cachedBinary = sass.getCachedBinary(),
+    cachePath = sass.getBinaryCachePath(),
+    binaryPath = sass.getBinaryPath();
+
+  if (sass.hasBinary(binaryPath)) {
+    console.log('node-sass build', 'Binary found at', binaryPath);
+    return;
+  }
+
+  try {
+    fs.mkdirSync(path.dirname(binaryPath), {recursive: true});
+  } catch (err) {
+    console.error('Unable to save binary', path.dirname(binaryPath), ':', err);
+    return;
+  }
+
+  if (cachedBinary) {
+    console.log('Cached binary found at', cachedBinary);
+    fs.createReadStream(cachedBinary).pipe(fs.createWriteStream(binaryPath));
+    return;
+  }
+
+  download(sass.getBinaryUrl(), binaryPath, function(err) {
+    if (err) {
+      console.error(err);
+      return;
+    }
+
+    console.log('Binary saved to', binaryPath);
+
+    cachedBinary = path.join(cachePath, sass.getBinaryName());
+
+    if (cachePath) {
+      console.log('Caching binary to', cachedBinary);
+
+      try {
+        fs.mkdirSync(path.dirname(cachedBinary), {recursive: true});
+        fs.createReadStream(binaryPath)
+          .pipe(fs.createWriteStream(cachedBinary))
+          .on('error', function (err) {
+            console.log('Failed to cache binary:', err);
+          });
+      } catch (err) {
+        console.log('Failed to cache binary:', err);
+      }
+    }
+  });
+}
+
+/**
+ * If binary does not exist, download it
+ */
+
+checkAndDownloadBinary();