{"maintainers":[{"name":"anonymous","email":"k4t0.kei@gmail.com"}],"keywords":["sourcemap","source-map"],"dist-tags":{"latest":"1.1.0"},"author":{"name":"keik","email":"k4t0.kei@gmail.com"},"description":"Merge old source map and new source map in multi-transform flow","readme":"# merge-source-map\n\n[![npm-version](https://img.shields.io/npm/v/merge-source-map.svg?style=flat-square)](https://npmjs.org/package/merge-source-map)\n[![downloads](http://img.shields.io/npm/dm/merge-source-map.svg?style=flat-square)](https://npmjs.org/package/merge-source-map)\n[![travis-ci](https://img.shields.io/travis/keik/merge-source-map.svg?style=flat-square)](https://travis-ci.org/keik/merge-source-map)\n[![Coverage Status](https://img.shields.io/coveralls/keik/merge-source-map.svg?style=flat-square)](https://coveralls.io/github/keik/merge-source-map)\n\nMerge old source map and new source map in multi-transform flow\n\n\n# API\n\n```javascript\nvar merge = require('merge-source-map')\n```\n\n\n## `merge(oldMap, newMap)`\n\nMerge old source map and new source map and return merged.\nIf old or new source map value is falsy, return another one as it is.\n\n
\n
\n oldMap : object|undefined\n
\n
\n old source map object\n
\n\n
\n newmap : object|undefined\n
\n
\n new source map object\n
\n
\n\n\n# Example\n\n```javascript\nvar esprima = require('esprima'),\n estraverse = require('estraverse'),\n escodegen = require('escodegen'),\n convert = require('convert-source-map'),\n merge = require('merge-source-map')\n\nconst CODE = 'a = 1',\n FILEPATH = 'a.js'\n\n// create AST of original code\nvar ast = esprima.parse(CODE, {sourceType: 'module', loc: true})\n\n// transform AST of original code\nestraverse.replace(ast, {\n enter: function(node, parent) { /* change AST */ },\n leave: function(node, parent) { /* change AST */ }\n})\n\n// generate code and source map from transformed AST\nvar gen = escodegen.generate(ast, {\n sourceMap: FILEPATH,\n sourceMapWithCode: true,\n sourceContent: CODE\n})\n\n// merge old source map and new source map\nvar oldMap = convert.fromSource(CODE) && convert.fromSource(CODE).toObject(),\n newMap = JSON.parse(gen.map.toString()),\n mergedMap = merge(oldMap, newMap),\n mapComment = convert.fromObject(mergedMap).toComment()\n\n// attach merge source map to transformed code\nvar transformed = gen.code + '\\n' + mapComment\n\nconsole.log(transformed);\n```\n\n\n# Test\n\n```\n% npm install\n% npm test\n```\n\n\n# License\n\nMIT (c) keik\n","repository":{"type":"git","url":"git+https://github.com/keik/merge-source-map.git"},"license":"MIT","bugs":{"url":"https://github.com/keik/merge-source-map/issues"},"versions":{"1.0.0":{"name":"merge-source-map","version":"1.0.0","description":"Merge old source map and new source map in multi-transform flow","main":"index.js","scripts":{"test":"tape 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