Error: ENOTDIR: not a directory when using "layouts/Layout.vue" as entry file

[ocavue]

• I confirm that this is an issue rather than a question.

Bug report

Version

vuepress: 1.0.0-alpha.47

Steps to reproduce

What is expected?

When I set the "main" field to layouts/Layout.vue in package.json as what the docs
tell me to do, I can build my package successfully.

What is actually happening?

vuepress/packages/@vuepress/core/lib/node/loadTheme.js

Lines 56 to 75 in 41b5cfb

	function normalizeThemePath (resolved) {
	const { entry, name, fromDep } = resolved
	if (fromDep) {
	const packageRoot = require.resolve(`${name}/package.json`)
	const { main } = require(packageRoot)
	if (main.endsWith('.vue')) {
	// For those cases that "main" field is set to an non-index file
	// e.g. `layouts/Layout.vue`
	return packageRoot
	} else {
	// For those cases that "index.js" is not at package root
	// e.g. `lib/index.js` (#1362)
	return parse(require.resolve(name)).dir
	}
	} else if (entry.endsWith('.js') || entry.endsWith('.vue')) {
	return parse(entry).dir
	} else {
	return entry
	}
	}

function normalizeThemePath return 'xxxx/package.json' because fromDep===true and main==="layouts/Layout.vue" in my case and casue the error below.

Error: ENOTDIR: not a directory, scandir '/Users/ocavue/code/github/vuepress-theme-blogue/package.json'
    at Object.readdirSync (fs.js:806:3)
    at readdirSync (/Users/ocavue/code/github/vuepress-theme-blogue/example/node_modules/@vuepress/core/lib/node/theme-api/index.js:2:53)
    at dirs.map.layoutDir (/Users/ocavue/code/github/vuepress-theme-blogue/example/node_modules/@vuepress/core/lib/node/theme-api/index.js:113:18)
    at Array.map (<anonymous>)
    at resolveSFCs (/Users/ocavue/code/github/vuepress-theme-blogue/example/node_modules/@vuepress/core/lib/node/theme-api/index.js:112:15)
    at ThemeAPI.getLayoutComponentMap (/Users/ocavue/code/github/vuepress-theme-blogue/example/node_modules/@vuepress/core/lib/node/theme-api/index.js:74:32)
    at ThemeAPI.init (/Users/ocavue/code/github/vuepress-theme-blogue/example/node_modules/@vuepress/core/lib/node/theme-api/index.js:34:36)
    at new ThemeAPI (/Users/ocavue/code/github/vuepress-theme-blogue/example/node_modules/@vuepress/core/lib/node/theme-api/index.js:16:10)
    at loadTheme (/Users/ocavue/code/github/vuepress-theme-blogue/example/node_modules/@vuepress/core/lib/node/loadTheme.js:53:10)
    at App.process (/Users/ocavue/code/github/vuepress-theme-blogue/example/node_modules/@vuepress/core/lib/node/App.js:100:21)
    at dev (/Users/ocavue/code/github/vuepress-theme-blogue/example/node_modules/@vuepress/core/lib/index.js:14:13)
    at args (/Users/ocavue/code/github/vuepress-theme-blogue/example/node_modules/vuepress/lib/util.js:35:12)
    at CAC.cli.command.option.option.option.option.option.option.option.option.option.action (/Users/ocavue/code/github/vuepress-theme-blogue/example/node_modules/vuepress/lib/registerCoreCommands.js:35:23)
    at CAC.runMatchedCommand (/Users/ocavue/code/github/vuepress-theme-blogue/example/node_modules/cac/dist/index.js:702:38)
    at CAC.parse (/Users/ocavue/code/github/vuepress-theme-blogue/example/node_modules/cac/dist/index.js:622:18)
    at CLI (/Users/ocavue/code/github/vuepress-theme-blogue/example/node_modules/vuepress/lib/util.js:23:7)

If I change return packageRoot into return parse(require.resolve(name)).dir, this issue will not occur.

Other relevant information

• Your OS: macOS 10.13.6
• Node.js version: v11.14.0
• Browser version: N/A
• Is this a global or local install? local
• Which package manager did you use for the install? yarn
• Does this issue occur when all plugins are disabled? yes