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loklaan/jest-resolver.js

Created October 20, 2017 00:03
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Jest Resolver w/ module field support
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jest-resolver.js
/*
|-------------------------------------------------------------------------------
| Custom 'module resolver' for Jest
|-------------------------------------------------------------------------------
|
| Forked from Jest, this is the default 'resolver' with the added benefit of
| remapping the "main" field to the value of the "module" field, when present.
|
*/
const fs = require('fs');
const path = require('path');
const resolve = require('resolve');
const browserResolve = require('browser-resolve');
function defaultResolver (path, options) {
const resv = options.browser ? browserResolve : resolve;
return resv.sync(path, {
basedir: options.basedir,
extensions: options.extensions,
moduleDirectory: options.moduleDirectory,
paths: options.paths,
packageFilter: mapModuleFieldToMain
});
}
module.exports = defaultResolver;
/*
|-------------------------------------------------------------------------------
| Utils
*/
function mapModuleFieldToMain (pkg, pkgDir) {
const moduleSrcPath = pkg['module'];
const isModuleFieldAvailable = moduleSrcPath &&
fs.existsSync(path.resolve(pkgDir, moduleSrcPath));
if (isModuleFieldAvailable) {
return Object.assign({}, pkg, { main: moduleSrcPath });
} else {
return pkg;
}
}
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