vue hello world项目
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/**
* @fileoverview require the component to be directly exported
* @author Hiroki Osame <hiroki.osame@gmail.com>
*/
'use strict'
const utils = require('../utils')
// ------------------------------------------------------------------------------
// Rule Definition
// ------------------------------------------------------------------------------
module.exports = {
meta: {
type: 'suggestion',
docs: {
description: 'require the component to be directly exported',
categories: undefined,
url: 'https://eslint.vuejs.org/rules/require-direct-export.html'
},
fixable: null, // or "code" or "whitespace"
schema: [
{
type: 'object',
properties: {
disallowFunctionalComponentFunction: { type: 'boolean' }
},
additionalProperties: false
}
]
},
/** @param {RuleContext} context */
create(context) {
const filePath = context.getFilename()
if (!utils.isVueFile(filePath)) return {}
const disallowFunctional = (context.options[0] || {})
.disallowFunctionalComponentFunction
/**
* @typedef {object} ScopeStack
* @property {ScopeStack | null} upper
* @property {boolean} withinVue3FunctionalBody
*/
/** @type { { body: BlockStatement, hasReturnArgument: boolean } } */
let maybeVue3Functional
/** @type {ScopeStack | null} */
let scopeStack = null
return {
/** @param {Declaration | Expression} node */
'ExportDefaultDeclaration > *'(node) {
if (node.type === 'ObjectExpression') {
// OK
return
}
if (node.type === 'CallExpression') {
const {
callee,
arguments: [firstArg]
} = node
if (firstArg && firstArg.type === 'ObjectExpression') {
if (
(callee.type === 'Identifier' &&
callee.name === 'defineComponent') ||
(callee.type === 'MemberExpression' &&
callee.object.type === 'Identifier' &&
callee.object.name === 'Vue' &&
callee.property.type === 'Identifier' &&
callee.property.name === 'extend')
) {
return
}
}
}
if (!disallowFunctional) {
if (node.type === 'ArrowFunctionExpression') {
if (node.body.type !== 'BlockStatement') {
// OK
return
}
maybeVue3Functional = {
body: node.body,
hasReturnArgument: false
}
return
}
if (
node.type === 'FunctionExpression' ||
node.type === 'FunctionDeclaration'
) {
maybeVue3Functional = {
body: node.body,
hasReturnArgument: false
}
return
}
}
context.report({
node: node.parent,
message: `Expected the component literal to be directly exported.`
})
},
...(disallowFunctional
? {}
: {
/** @param {BlockStatement} node */
':function > BlockStatement'(node) {
if (!maybeVue3Functional) {
return
}
scopeStack = {
upper: scopeStack,
withinVue3FunctionalBody: maybeVue3Functional.body === node
}
},
/** @param {ReturnStatement} node */
ReturnStatement(node) {
if (
scopeStack &&
scopeStack.withinVue3FunctionalBody &&
node.argument
) {
maybeVue3Functional.hasReturnArgument = true
}
},
':function > BlockStatement:exit'() {
scopeStack = scopeStack && scopeStack.upper
},
/** @param {ExportDefaultDeclaration} node */
'ExportDefaultDeclaration:exit'(node) {
if (!maybeVue3Functional) {
return
}
if (!maybeVue3Functional.hasReturnArgument) {
context.report({
node,
message: `Expected the component literal to be directly exported.`
})
}
}
})
}
}
}