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147 lines
3.7 KiB
Markdown
147 lines
3.7 KiB
Markdown
# browser-resolve [](https://travis-ci.org/defunctzombie/node-browser-resolve)
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node.js resolve algorithm with [browser field](https://github.com/defunctzombie/package-browser-field-spec) support.
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## api
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### resolve(id, opts={}, cb)
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Resolve a module path and call `cb(err, path [, pkg])`
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Options:
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* `basedir` - directory to begin resolving from
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* `browser` - the 'browser' property to use from package.json (defaults to 'browser')
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* `filename` - the calling filename where the `require()` call originated (in the source)
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* `modules` - object with module id/name -> path mappings to consult before doing manual resolution (use to provide core modules)
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* `packageFilter` - transform the parsed `package.json` contents before looking at the `main` field
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* `paths` - `require.paths` array to use if nothing is found on the normal `node_modules` recursive walk
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Options supported by [node-resolve](https://github.com/substack/node-resolve#resolveid-opts-cb) can be used.
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### resolve.sync(id, opts={})
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Same as the async resolve, just uses sync methods.
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Options supported by [node-resolve](https://github.com/substack/node-resolve#resolvesyncid-opts) `sync` can be used.
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## basic usage
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you can resolve files like `require.resolve()`:
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``` js
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var resolve = require('browser-resolve');
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resolve('../', { filename: __filename }, function(err, path) {
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console.log(path);
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});
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```
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```
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$ node example/resolve.js
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/home/substack/projects/node-browser-resolve/index.js
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```
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## core modules
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By default, core modules (http, dgram, etc) will return their same name as the path. If you want to have specific paths returned, specify a `modules` property in the options object.
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``` js
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var shims = {
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http: '/your/path/to/http.js'
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};
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var resolve = require('browser-resolve');
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resolve('fs', { modules: shims }, function(err, path) {
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console.log(path);
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});
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```
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```
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$ node example/builtin.js
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/home/substack/projects/node-browser-resolve/builtin/fs.js
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```
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## browser field
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browser-specific versions of modules
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``` js
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{
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"name": "custom",
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"version": "0.0.0",
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"browser": {
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"./main.js": "custom.js"
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},
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"chromeapp": {
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"./main.js": "custom-chromeapp.js"
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}
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}
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```
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``` js
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var resolve = require('browser-resolve');
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var parent = { filename: __dirname + '/custom/file.js' /*, browser: 'chromeapp' */ };
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resolve('./main.js', parent, function(err, path) {
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console.log(path);
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});
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```
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```
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$ node example/custom.js
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/home/substack/projects/node-browser-resolve/example/custom/custom.js
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```
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## skip
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You can skip over dependencies by setting a
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[browser field](https://gist.github.com/defunctzombie/4339901)
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value to `false`:
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``` json
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{
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"name": "skip",
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"version": "0.0.0",
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"browser": {
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"tar": false
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}
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}
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```
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This is handy if you have code like:
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``` js
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var tar = require('tar');
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exports.add = function (a, b) {
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return a + b;
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};
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exports.parse = function () {
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return tar.Parse();
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};
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```
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so that `require('tar')` will just return `{}` in the browser because you don't
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intend to support the `.parse()` export in a browser environment.
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``` js
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var resolve = require('browser-resolve');
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var parent = { filename: __dirname + '/skip/main.js' };
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resolve('tar', parent, function(err, path) {
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console.log(path);
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});
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```
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```
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$ node example/skip.js
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/home/substack/projects/node-browser-resolve/empty.js
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```
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# license
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MIT
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# upgrade notes
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Prior to v1.x this library provided shims for node core modules. These have since been removed. If you want to have alternative core modules provided, use the `modules` option when calling resolve.
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This was done to allow package managers to choose which shims they want to use without browser-resolve being the central point of update.
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