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feat(node-resolve): support package entry points
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,197 @@ | ||
| import fs from 'fs'; | ||
| import path from 'path'; | ||
| import { promisify } from 'util'; | ||
|
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| import resolve from 'resolve'; | ||
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| import { getPackageName } from './util'; | ||
| import { exists, realpath } from './fs'; | ||
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| const resolveImportPath = promisify(resolve); | ||
| const readFile = promisify(fs.readFile); | ||
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| const pathNotFoundError = (subPath, pkgPath) => | ||
| new Error(`Package subpath '${subPath}' is not defined by "exports" in ${pkgPath}`); | ||
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| function findExportKeyMatch(exportMap, subPath) { | ||
| for (const key of Object.keys(exportMap)) { | ||
| if (key.endsWith('*')) { | ||
| // star match: "./foo/*": "./foo/*.js" | ||
| const keyWithoutStar = key.substring(0, key.length - 1); | ||
| if (subPath.startsWith(keyWithoutStar)) { | ||
| return key; | ||
| } | ||
| } | ||
|
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| if (key.endsWith('/') && subPath.startsWith(key)) { | ||
| // directory match (deprecated by node): "./foo/": "./foo/.js" | ||
| return key; | ||
| } | ||
|
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| if (key === subPath) { | ||
| // literal match | ||
| return key; | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
|
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| function mapSubPath(pkgJsonPath, subPath, key, value) { | ||
| if (typeof value === 'string') { | ||
| if (typeof key === 'string' && key.endsWith('*')) { | ||
| // star match: "./foo/*": "./foo/*.js" | ||
| const keyWithoutStar = key.substring(0, key.length - 1); | ||
| const subPathAfterKey = subPath.substring(keyWithoutStar.length); | ||
| return value.replace(/\*/g, subPathAfterKey); | ||
| } | ||
|
|
||
| if (value.endsWith('/')) { | ||
| // directory match (deprecated by node): "./foo/": "./foo/.js" | ||
| return `${value}${subPath.substring(key.length)}`; | ||
| } | ||
|
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||
| // mapping is a string, for example { "./foo": "./dist/foo.js" } | ||
| return value; | ||
| } | ||
|
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| if (Array.isArray(value)) { | ||
| // mapping is an array with fallbacks, for example { "./foo": ["foo:bar", "./dist/foo.js"] } | ||
| return value.find((v) => v.startsWith('./')); | ||
| } | ||
|
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| throw pathNotFoundError(subPath, pkgJsonPath); | ||
| } | ||
|
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| function findEntrypoint(pkgJsonPath, subPath, exportMap, conditions, key) { | ||
| if (typeof exportMap !== 'object') { | ||
| return mapSubPath(pkgJsonPath, subPath, key, exportMap); | ||
| } | ||
|
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| // iterate conditions recursively, find the first that matches all conditions | ||
| for (const [condition, subExportMap] of Object.entries(exportMap)) { | ||
| if (conditions.includes(condition)) { | ||
| const mappedSubPath = findEntrypoint(pkgJsonPath, subPath, subExportMap, conditions, key); | ||
| if (mappedSubPath) { | ||
| return mappedSubPath; | ||
| } | ||
| } | ||
| } | ||
| throw pathNotFoundError(subPath, pkgJsonPath); | ||
| } | ||
|
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||
| export function findEntrypointTopLevel(pkgJsonPath, subPath, exportMap, conditions) { | ||
| if (typeof exportMap !== 'object') { | ||
| // the export map shorthand, for example { exports: "./index.js" } | ||
| if (subPath !== '.') { | ||
| // shorthand only supports a main entrypoint | ||
| throw pathNotFoundError(subPath, pkgJsonPath); | ||
| } | ||
| return mapSubPath(pkgJsonPath, subPath, null, exportMap); | ||
| } | ||
|
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| // export map is an object, the top level can be either conditions or sub path mappings | ||
| const keys = Object.keys(exportMap); | ||
| const isConditions = keys.every((k) => !k.startsWith('.')); | ||
| const isMappings = keys.every((k) => k.startsWith('.')); | ||
|
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| if (!isConditions && !isMappings) { | ||
| throw new Error( | ||
| `Invalid package config ${pkgJsonPath}, "exports" cannot contain some keys starting with '.'` + | ||
| ' and some not. The exports object must either be an object of package subpath keys or an object of main entry' + | ||
| ' condition name keys only.' | ||
| ); | ||
| } | ||
|
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| let key = null; | ||
| let exportMapForSubPath; | ||
|
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| if (isConditions) { | ||
| // top level is conditions, for example { "import": ..., "require": ..., "module": ... } | ||
| if (subPath !== '.') { | ||
| // package with top level conditions means it only supports a main entrypoint | ||
| throw pathNotFoundError(subPath, pkgJsonPath); | ||
| } | ||
| exportMapForSubPath = exportMap; | ||
| } else { | ||
| // top level is sub path mappings, for example { ".": ..., "./foo": ..., "./bar": ... } | ||
| key = findExportKeyMatch(exportMap, subPath); | ||
| if (!key) { | ||
| throw pathNotFoundError(subPath, pkgJsonPath); | ||
| } | ||
| exportMapForSubPath = exportMap[key]; | ||
| } | ||
|
|
||
| return findEntrypoint(pkgJsonPath, subPath, exportMapForSubPath, conditions, key); | ||
| } | ||
|
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||
| async function resolveId(importPath, options, exportConditions, warn) { | ||
| const pkgName = getPackageName(importPath); | ||
| if (pkgName) { | ||
| let pkgJsonPath; | ||
| let pkgJson; | ||
| try { | ||
| pkgJsonPath = await resolveImportPath(`${pkgName}/package.json`, options); | ||
| pkgJson = JSON.parse(await readFile(pkgJsonPath, 'utf-8')); | ||
| } catch (_) { | ||
| // if there is no package.json we defer to regular resolve behavior | ||
| } | ||
|
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||
| if (pkgJsonPath && pkgJson && pkgJson.exports) { | ||
| try { | ||
| const packageSubPath = | ||
| pkgName === importPath ? '.' : `.${importPath.substring(pkgName.length)}`; | ||
| const mappedSubPath = findEntrypointTopLevel( | ||
| pkgJsonPath, | ||
| packageSubPath, | ||
| pkgJson.exports, | ||
| exportConditions | ||
| ); | ||
| const pkgDir = path.dirname(pkgJsonPath); | ||
| return path.join(pkgDir, mappedSubPath); | ||
| } catch (error) { | ||
| warn(error); | ||
| return null; | ||
| } | ||
| } | ||
| } | ||
|
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| return resolveImportPath(importPath, options); | ||
| } | ||
|
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| // Resolve module specifiers in order. Promise resolves to the first module that resolves | ||
| // successfully, or the error that resulted from the last attempted module resolution. | ||
| export function resolveImportSpecifiers( | ||
| importSpecifierList, | ||
| resolveOptions, | ||
| exportConditions, | ||
| warn | ||
| ) { | ||
| let promise = Promise.resolve(); | ||
|
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||
| for (let i = 0; i < importSpecifierList.length; i++) { | ||
| // eslint-disable-next-line no-loop-func | ||
| promise = promise.then(async (value) => { | ||
| // if we've already resolved to something, just return it. | ||
| if (value) { | ||
| return value; | ||
| } | ||
|
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| let result = await resolveId(importSpecifierList[i], resolveOptions, exportConditions, warn); | ||
| if (!resolveOptions.preserveSymlinks) { | ||
| if (await exists(result)) { | ||
| result = await realpath(result); | ||
| } | ||
| } | ||
| return result; | ||
| }); | ||
|
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| // swallow MODULE_NOT_FOUND errors | ||
| promise = promise.catch((error) => { | ||
| if (error.code !== 'MODULE_NOT_FOUND') { | ||
| throw error; | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| return promise; | ||
| } |
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