├── package.json
├── README.md
├── LICENSE
└── index.js


/package.json:
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 1 | {
 2 |   "name": "babel-plugin-transform-invariant-location",
 3 |   "version": "1.0.1",
 4 |   "description": "Babel plugin that rewrites invariant calls with their source location",
 5 |   "main": "index.js",
 6 |   "repository": {
 7 |     "type": "git",
 8 |     "url": "git+https://github.com/github/babel-plugin-transform-invariant-location.git"
 9 |   },
10 |   "license": "MIT",
11 |   "homepage": "https://github.com/github/babel-plugin-transform-invariant-location#readme"
12 | }
13 | 


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/README.md:
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 1 | # transform-invariant-location
 2 | 
 3 | A Babel plugin to annotate [Flow `invariant()` calls](https://github.com/zertosh/invariant) with an additional string argument detailing the current file and line number. This is useful to track down exceptions that are raised by `invariant()` in minified bundles at runtime.
 4 | 
 5 | Before:
 6 | 
 7 | ```js
 8 | invariant(foo)
 9 | invariant(foo, "foo is missing")
10 | ```
11 | 
12 | After:
13 | 
14 | ```js
15 | invariant(foo, "path/to/source.js:42")
16 | invariant(foo, "foo is missing -- path/to/source.js:42")
17 | ```
18 | 


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/LICENSE:
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 1 | MIT License
 2 | 
 3 | Copyright (c) 2018 GitHub, Inc.
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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/index.js:
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 1 | const visited = new WeakSet()
 2 | 
 3 | module.exports = function(opts) {
 4 |   const t = opts.types
 5 | 
 6 |   return {
 7 |     visitor: {
 8 |       CallExpression: function(path) {
 9 |         if (path.node.callee.name === 'invariant') {
10 |           if (visited.has(path.node)) {
11 |             return
12 |           }
13 | 
14 |           let moduleName = this.getModuleName()
15 |           if (moduleName) {
16 |             moduleName = t.stringLiteral(moduleName) + '.js'
17 |           } else {
18 |             try {
19 |               moduleName = this.file.opts.filename.replace(`${this.cwd}/`, '')
20 |             } catch (err) {
21 |               return
22 |             }
23 |           }
24 | 
25 |           const location = `${moduleName}:${path.node.loc.start.line}`
26 |           const message = path.node.arguments.length === 2 ?
27 |             `${path.node.arguments[1].value} -- ${location}` :
28 |             location
29 | 
30 |           const newNode = t.callExpression(
31 |             t.identifier('invariant'), [path.node.arguments[0], t.stringLiteral(message)]
32 |           )
33 |           visited.add(newNode)
34 | 
35 |           path.replaceWith(newNode)
36 |         }
37 |       }
38 |     }
39 |   }
40 | }
41 | 


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