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node_modules/@gulp-sourcemaps/identity-map/lib/generate.js

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+'use strict';
+
+var acorn = require('acorn');
+var postcss = require('postcss');
+var SourceMapGenerator = require('source-map').SourceMapGenerator;
+
+function generateJs(sourcePath, fileContent) {
+  var generator = new SourceMapGenerator({ file: sourcePath });
+  var tokenizer = acorn.tokenizer(fileContent, {
+    allowHashBang: true,
+    locations: true,
+  });
+
+  /* eslint no-constant-condition: 0 */
+  while (true) {
+    var token = tokenizer.getToken();
+
+    if (token.type.label === 'eof') {
+      break;
+    }
+    var mapping = {
+      original: token.loc.start,
+      generated: token.loc.start,
+      source: sourcePath,
+    };
+    if (token.type.label === 'name') {
+      mapping.name = token.value;
+    }
+    generator.addMapping(mapping);
+  }
+  generator.setSourceContent(sourcePath, fileContent);
+
+  return generator.toJSON();
+}
+
+var postcssSourceMapOptions = {
+  inline: false,
+  prev: false,
+  sourcesContent: true,
+  annotation: false,
+};
+
+function generateCss(sourcePath, fileContent) {
+  var root = postcss.parse(fileContent, { from: sourcePath });
+  var result = root.toResult({ to: sourcePath, map: postcssSourceMapOptions });
+
+  return result.map.toJSON();
+}
+
+module.exports = {
+  js: generateJs,
+  css: generateCss,
+};