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authorFlorian Dold <florian.dold@gmail.com>2019-03-27 21:01:33 +0100
committerFlorian Dold <florian.dold@gmail.com>2019-03-27 21:01:33 +0100
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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)
-[![downloads](http://img.shields.io/npm/dm/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