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node_modules/merge-source-map/README.md
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| r789 | # merge-source-map | |||
| [](https://npmjs.org/package/merge-source-map) | ||||
| [](https://travis-ci.org/keik/merge-source-map) | ||||
| [](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 | ||||