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+# merge-source-map
+
+[![npm-version](https://img.shields.io/npm/v/merge-source-map.svg?style=flat-square)](https://npmjs.org/package/merge-source-map)
+[![travis-ci](https://img.shields.io/travis/keik/merge-source-map.svg?style=flat-square)](https://travis-ci.org/keik/merge-source-map)
+[![Coverage Status](https://img.shields.io/coveralls/keik/merge-source-map.svg?style=flat-square)](https://coveralls.io/github/keik/merge-source-map)
+
+Merge old source map and new source map in multi-transform flow
+
+
+# API
+
+```javascript
+var merge = require('merge-source-map')
+```
+
+
+## `merge(oldMap, newMap)`
+
+Merge old source map and new source map and return merged.
+If old or new source map value is falsy, return another one as it is.
+
+<dl>
+  <dt>
+    <code>oldMap</code> : <code>object|undefined</code>
+  </dt>
+  <dd>
+    old source map object
+  </dd>
+
+  <dt>
+    <code>newmap</code> : <code>object|undefined</code>
+  </dt>
+  <dd>
+    new source map object
+  </dd>
+</dl>
+
+
+# Example
+
+```javascript
+var esprima    = require('esprima'),
+    estraverse = require('estraverse'),
+    escodegen  = require('escodegen'),
+    convert    = require('convert-source-map'),
+    merge      = require('merge-source-map')
+
+const CODE = 'a = 1',
+      FILEPATH = 'a.js'
+
+// create AST of original code
+var ast = esprima.parse(CODE, {sourceType: 'module', loc: true})
+
+// transform AST of original code
+estraverse.replace(ast, {
+  enter: function(node, parent) { /* change AST */ },
+  leave: function(node, parent) { /* change AST */ }
+})
+
+// generate code and source map from transformed AST
+var gen = escodegen.generate(ast, {
+  sourceMap: FILEPATH,
+  sourceMapWithCode: true,
+  sourceContent: CODE
+})
+
+// merge old source map and new source map
+var oldMap = convert.fromSource(CODE) && convert.fromSource(CODE).toObject(),
+    newMap = JSON.parse(gen.map.toString()),
+    mergedMap = merge(oldMap, newMap),
+    mapComment = convert.fromObject(mergedMap).toComment()
+
+// attach merge source map to transformed code
+var transformed = gen.code + '\n' + mapComment
+
+console.log(transformed);
+```
+
+
+# Test
+
+```
+% npm install
+% npm test
+```
+
+
+# License
+
+MIT (c) keik