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[New] add support for the exports package.json attribute
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| var path = require('path'); | ||
| var startsWith = require('string.prototype.startswith'); | ||
|
|
||
| function makeError(code, message) { | ||
| var error = new Error(message); | ||
| error.code = code; | ||
| return error; | ||
| } | ||
|
|
||
| function validateExports(exports, basePath) { | ||
| var isConditional = true; | ||
|
|
||
| if (typeof exports === 'object' && !Array.isArray(exports)) { | ||
| var exportKeys = Object.keys(exports); | ||
|
|
||
| for (var i = 0; i < exportKeys.length; i++) { | ||
| var isKeyConditional = exportKeys[i][0] !== '.'; | ||
| if (i === 0) { | ||
| isConditional = isKeyConditional; | ||
| } else if (isKeyConditional !== isConditional) { | ||
| throw makeError('ERR_INVALID_PACKAGE_CONFIG', 'Invalid package config ' + basePath + path.sep + 'package.json, ' | ||
| + '"exports" cannot contain some keys starting with \'.\' and some not. ' | ||
| + 'The exports object must either be an object of package subpath keys ' | ||
| + 'or an object of main entry condition name keys only.'); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if (isConditional) { | ||
| return { '.': exports }; | ||
| } else { | ||
| return exports; | ||
| } | ||
| } | ||
|
|
||
| function validateConditions(names) { | ||
| // TODO If exports contains any index property keys, as defined in ECMA-262 6.1.7 Array Index, throw an Invalid Package Configuration error. | ||
| return names; | ||
| } | ||
|
|
||
| // eslint-disable-next-line max-lines-per-function | ||
| function resolvePackageTarget(packagePath, parent, key, target, subpath, internal, conditions) { | ||
| if (typeof target === 'string') { | ||
| var resolvedTarget = path.resolve(packagePath, target); | ||
| var invalidTarget = false; | ||
|
|
||
| if (!startsWith(target, './')) { | ||
| if (!internal) { | ||
| invalidTarget = true; | ||
| } else if (!startsWith(target, '../') && !startsWith(target, '/')) { | ||
| invalidTarget = true; | ||
| } else { | ||
| // TODO: imports need call package_resolve here | ||
| } | ||
| } | ||
|
|
||
| var targetParts = target.split(/[\\/]/).slice(1); // slice to strip the leading '.' | ||
| if (invalidTarget || targetParts.indexOf('node_modules') !== -1 || targetParts.indexOf('.') !== -1 || targetParts.indexOf('..') !== -1) { | ||
| throw makeError('ERR_INVALID_PACKAGE_TARGET', 'Invalid "exports" target ' + JSON.stringify(target) | ||
| + ' defined for ' + key + ' in ' + packagePath + path.sep + 'package.json imported from ' + parent + '.'); | ||
| } | ||
|
|
||
| if (subpath !== '' && target[target.length - 1] !== '/') { | ||
| throw makeError('ERR_INVALID_MODULE_SPECIFIER', 'Package subpath "' + subpath + '" is not a valid module request for ' | ||
| + 'the "exports" resolution of ' + packagePath + path.sep + 'package.json imported from ' + parent + '.'); | ||
| } | ||
|
|
||
| var resolved = path.normalize(resolvedTarget + subpath); | ||
| var subpathParts = subpath.split(/[\\/]/); | ||
| if (!startsWith(resolved, resolvedTarget) || subpathParts.indexOf('node_modules') !== -1 || subpathParts.indexOf('.') !== -1 || subpathParts.indexOf('..') !== -1) { | ||
| throw makeError('ERR_INVALID_MODULE_SPECIFIER', 'Package subpath "' + subpath + '" is not a valid module request for ' | ||
| + 'the "exports" resolution of ' + packagePath + path.sep + 'package.json imported from ' + parent + '.'); | ||
| } | ||
|
|
||
| return resolved; | ||
| } | ||
|
|
||
| if (Array.isArray(target)) { | ||
| if (target.length === 0) { | ||
| throw makeError('ERR_PACKAGE_PATH_NOT_EXPORTED', key === '.' | ||
| ? 'No "exports" main resolved in ' + packagePath + path.sep + 'package.json.' | ||
| : 'Package subpath ' + key + ' is not defined by "exports" in ' + packagePath + path.sep + 'package.json imported from ' + parent + '.'); | ||
| } | ||
|
|
||
| var lastError; | ||
| for (var i = 0; i < target.length; i++) { | ||
| try { | ||
| return resolvePackageTarget(packagePath, parent, key, target[i], subpath, internal, conditions); | ||
| } catch (e) { | ||
| if (e && (e.code === 'ERR_PACKAGE_PATH_NOT_EXPORTED' || e.code === 'ERR_INVALID_PACKAGE_TARGET')) { | ||
| lastError = e; | ||
| } else { | ||
| throw e; | ||
| } | ||
| } | ||
| } | ||
| throw lastError; | ||
| } | ||
|
|
||
| if (target === null) { | ||
| throw makeError('ERR_PACKAGE_PATH_NOT_EXPORTED', key === '.' | ||
| ? 'No "exports" main resolved in ' + packagePath + path.sep + 'package.json.' | ||
| : 'Package subpath ' + key + ' is not defined by "exports" in ' + packagePath + path.sep + 'package.json imported from ' + parent + '.'); | ||
| } | ||
|
|
||
| if (typeof target !== 'object') { | ||
| throw makeError('ERR_INVALID_PACKAGE_TARGET', 'Invalid "exports" target ' + JSON.stringify(target) | ||
| + ' defined for ' + key + ' in ' + packagePath + path.sep + 'package.json imported from ' + parent + '.'); | ||
| } | ||
|
|
||
| var exportedConditions = validateConditions(Object.keys(target)); | ||
|
|
||
| for (i = 0; i < exportedConditions.length; i++) { | ||
| var exportedCondition = exportedConditions[i]; | ||
| if (exportedCondition === 'default' || conditions.indexOf(exportedCondition) !== -1) { | ||
| try { | ||
| return resolvePackageTarget( | ||
| packagePath, | ||
| parent, | ||
| key, | ||
| target[exportedCondition], | ||
| subpath, | ||
| internal, | ||
| conditions | ||
| ); | ||
| } catch (e) { | ||
| if (!e || e.code !== 'ERR_PACKAGE_PATH_NOT_EXPORTED') { | ||
| throw e; | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| throw makeError('ERR_PACKAGE_PATH_NOT_EXPORTED', key === '.' | ||
| ? 'No "exports" main resolved in ' + packagePath + path.sep + 'package.json.' | ||
| : 'Package subpath ' + key + ' is not defined by "exports" in ' + packagePath + path.sep + 'package.json imported from ' + parent + '.'); | ||
| } | ||
|
|
||
| function resolveImportExport(packagePath, parent, matchObj, matchKey, isImports, conditions) { | ||
| if (Object.prototype.hasOwnProperty.call(matchObj, matchKey) && matchKey[matchKey.length - 1] !== '*') { | ||
| return { | ||
| resolved: resolvePackageTarget(packagePath, parent, matchKey, matchObj[matchKey], '', isImports, conditions), | ||
| exact: true | ||
| }; | ||
| } | ||
|
|
||
| var longestMatchingExport = ''; | ||
| var exportedPaths = Object.keys(matchObj); | ||
|
|
||
| for (var i = 0; i < exportedPaths.length; i++) { | ||
| var exportedPath = exportedPaths[i]; | ||
| if (exportedPath[exportedPath.length - 1] === '/' && startsWith(matchKey, exportedPath) && exportedPath.length > longestMatchingExport.length) { | ||
| longestMatchingExport = exportedPath; | ||
| } | ||
| } | ||
|
|
||
| if (longestMatchingExport === '') { | ||
| throw makeError('ERR_PACKAGE_PATH_NOT_EXPORTED', 'Package subpath ' + matchKey + ' is not defined by "exports" in ' | ||
| + packagePath + path.sep + 'package.json imported from ' + parent + '.'); | ||
| } | ||
|
|
||
| return { | ||
| resolved: resolvePackageTarget( | ||
| packagePath, | ||
| parent, | ||
| longestMatchingExport, | ||
| matchObj[longestMatchingExport], | ||
| matchKey.substring(longestMatchingExport.length - 1), | ||
| isImports, | ||
| conditions | ||
| ), | ||
| exact: false | ||
| }; | ||
| } | ||
|
|
||
| module.exports = function resolveExports(packagePath, parent, subpath, exports, conditions) { | ||
| return resolveImportExport( | ||
| packagePath, | ||
| parent, | ||
| validateExports(exports, packagePath), | ||
| '.' + subpath, | ||
| false, | ||
| conditions | ||
| ); | ||
| }; |
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