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conditional-export
Advanced tools
conditional-export
Find entry or path in package.json exports or imports.
https://nodejs.org/docs/latest-v12.x/api/packages.html#packages_exports
Usage
Apis usage description.
Debugging platform: https://imtaotao.github.io/conditional-export/
findEntryInExports
import { findEntryInExports } from 'conditional-export';
const exports = {
'.': {
require: './index.cjs',
development: './index.development.js',
default: './index.js',
},
}
findEntryInExports(exports); // ./index.cjs
findEntryInExports(exports, ['development']); // ./index.development.js
findEntryInExports(exports, ['production']); // ./index.js
findPathInExports
import { findPathInExports } from 'conditional-export';
const exports = {
'./lib/*': {
require: './src/*.cjs',
development: './src/*.development.js',
default: './src/*.js',
},
}
findPathInExports('./lib/index', exports); // ./src/index.cjs
findPathInExports('./lib/index', exports, ['development']); // ./src/index.development.js
findPathInExports('./lib/index', exports, ['production']); // ./src/index.js
Multiple conditions, default conditions is ['require'].
You can specify multiple conditions.
import { findPathInExports } from 'conditional-export';
const exports = {
'./a': {
node: {
import: './feature-node.mjs',
require: './feature-node.cjs',
},
default: './feature.default.mjs',
}
};
findPathInExports('./a', exports); // './feature.default.mjs'
findPathInExports('./a', exports, ['node', 'require']); // './feature-node.cjs'
findPathInImports
import { findPathInImports } from 'conditional-export';
const imports = {
'#timezones/': './data/timezones/',
'#timezones/utc': './data/timezones/utc/index.mjs',
'#external-feature': 'external-pkg/feature',
'#moment/': './'
}
findPathInImports('#timezones/utc', imports); // ./data/timezones/utc/index.mjs
findPathInImports('#external-feature', imports); // external-pkg/feature
findPathInImports('#timezones/utc/index.mjs', imports); // ./data/timezones/utc/index.mjs
findPathInImports('#moment/data/timezones/utc/index.mjs', imports); // ./data/timezones/utc/index.mjs
findPathInImports('#timezones/utc/', imports); // ./data/timezones/utc/
findPathInImports('#unknown', imports); // null
findPathInImports('#moment', imports); // null
findPkgData
import { findPkgData } from 'conditional-export';
const exports = {
'./': './src/util/',
'./timezones/': './data/timezones/',
'./timezones/utc': './data/timezones/utc/index.mjs',
}
const data = findPkgData('@vue/core/timezones/pdt.mjs', exports);
// {
// name: '@vue/core',
// version: '',
// path: './data/timezones/pdt.mjs',
// resolve: '@vue/core/data/timezones/pdt.mjs',
// raw: '@vue/core/timezones/pdt.mjs',
// }
parseModuleId
import { parseModuleId } from 'conditional-export';
parseModuleId('vue')
// {
// name: 'vue',
// path: '',
// version: '',
// raw: 'vue',
// }
parseModuleId('vue/');
// {
// name: 'vue',
// path: './',
// version: '',
// raw: 'vue/',
// }
parseModuleId('@vue/core@v1.0.0/a.js');
// {
// name: '@vue/core',
// path: './a.js',
// version: 'v1.0.0',
// raw: '@vue/core@v1.0.0/a.js',
// }
Extended usage
When you want to convert to absolute path, you can handle it like this.
import { findPkgData } from 'conditional-export';
const data = findPkgData('vue/src/index.js', exports, ['require', ...]);
if (data.path !== null) {
const resolvePath = isNodeEnv
? path.resolve(pkgDir, data.path) // NodeJs
: new URL(data.path, pkgDir).href; // Browser
} else {
// If the module doesn't exist, you should throw an error.
throw new Error(`Module '${data.raw}' Not Found`);
}
CDN
<!DOCTYPE html>
<html lang='en'>
<body>
<script src='https://unpkg.com/conditional-export/dist/entry.umd.js'></script>
<script>
const {
findPkgData,
findPathInImports,
findPathInExports,
findEntryInExports,
parseModuleId,
} = NodePackageExports;
// ...
</script>
</body>
</html>
FAQs
find node package entry or path in exports
We found that conditional-export demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
Package last updated on 29 Apr 2025
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