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node_modules/eslint-plugin-vue/lib/rules/no-static-inline-styles.js

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+/**
+ * @author Yosuke Ota
+ * See LICENSE file in root directory for full license.
+ */
+'use strict'
+
+const utils = require('../utils')
+module.exports = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'disallow static inline `style` attributes',
+      categories: undefined,
+      url: 'https://eslint.vuejs.org/rules/no-static-inline-styles.html'
+    },
+    fixable: null,
+    schema: [
+      {
+        type: 'object',
+        properties: {
+          allowBinding: {
+            type: 'boolean'
+          }
+        },
+        additionalProperties: false
+      }
+    ],
+    messages: {
+      forbiddenStaticInlineStyle: 'Static inline `style` are forbidden.',
+      forbiddenStyleAttr: '`style` attributes are forbidden.'
+    }
+  },
+  /** @param {RuleContext} context */
+  create(context) {
+    /**
+     * Checks whether if the given property node is a static value.
+     * @param {Property} prop property node to check
+     * @returns {boolean} `true` if the given property node is a static value.
+     */
+    function isStaticValue(prop) {
+      return (
+        !prop.computed &&
+        prop.value.type === 'Literal' &&
+        (prop.key.type === 'Identifier' || prop.key.type === 'Literal')
+      )
+    }
+
+    /**
+     * Gets the static properties of a given expression node.
+     * - If `SpreadElement` or computed property exists, it gets only the static properties before it.
+     *   `:style="{ color: 'red', display: 'flex', ...spread, width: '16px' }"`
+     *              ^^^^^^^^^^^^  ^^^^^^^^^^^^^^^
+     * - If non-static object exists, it gets only the static properties up to that object.
+     *   `:style="[ { color: 'red' }, { display: 'flex', color, width: '16px' }, { height: '16px' } ]"`
+     *                ^^^^^^^^^^^^      ^^^^^^^^^^^^^^^         ^^^^^^^^^^^^^
+     * - If all properties are static properties, it returns one root node.
+     *   `:style="[ { color: 'red' }, { display: 'flex', width: '16px' } ]"`
+     *    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+     * @param {VDirective} node `:style` node to check
+     * @returns {Property[] | [VDirective]} the static properties.
+     */
+    function getReportNodes(node) {
+      const { value } = node
+      if (!value) {
+        return []
+      }
+      const { expression } = value
+      if (!expression) {
+        return []
+      }
+
+      let elements
+      if (expression.type === 'ObjectExpression') {
+        elements = [expression]
+      } else if (expression.type === 'ArrayExpression') {
+        elements = expression.elements
+      } else {
+        return []
+      }
+      const staticProperties = []
+      for (const element of elements) {
+        if (!element) {
+          continue
+        }
+        if (element.type !== 'ObjectExpression') {
+          return staticProperties
+        }
+
+        let isAllStatic = true
+        for (const prop of element.properties) {
+          if (prop.type === 'SpreadElement' || prop.computed) {
+            // If `SpreadElement` or computed property exists, it gets only the static properties before it.
+            return staticProperties
+          }
+          if (isStaticValue(prop)) {
+            staticProperties.push(prop)
+          } else {
+            isAllStatic = false
+          }
+        }
+        if (!isAllStatic) {
+          // If non-static object exists, it gets only the static properties up to that object.
+          return staticProperties
+        }
+      }
+      // If all properties are static properties, it returns one root node.
+      return [node]
+    }
+
+    /**
+     * Reports if the value is static.
+     * @param {VDirective} node `:style` node to check
+     */
+    function verifyVBindStyle(node) {
+      for (const n of getReportNodes(node)) {
+        context.report({
+          node: n,
+          messageId: 'forbiddenStaticInlineStyle'
+        })
+      }
+    }
+
+    /** @type {TemplateListener} */
+    const visitor = {
+      /** @param {VAttribute} node */
+      "VAttribute[directive=false][key.name='style']"(node) {
+        context.report({
+          node,
+          messageId: 'forbiddenStyleAttr'
+        })
+      }
+    }
+    if (!context.options[0] || !context.options[0].allowBinding) {
+      visitor[
+        "VAttribute[directive=true][key.name.name='bind'][key.argument.name='style']"
+      ] = verifyVBindStyle
+    }
+
+    return utils.defineTemplateBodyVisitor(context, visitor)
+  }
+}