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app_vue/node_modules/eslint/lib/rules/init-declarations.js

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+/**
+ * @fileoverview A rule to control the style of variable initializations.
+ * @author Colin Ihrig
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Checks whether or not a given node is a for loop.
+ * @param {ASTNode} block A node to check.
+ * @returns {boolean} `true` when the node is a for loop.
+ */
+function isForLoop(block) {
+    return block.type === "ForInStatement" ||
+    block.type === "ForOfStatement" ||
+    block.type === "ForStatement";
+}
+
+/**
+ * Checks whether or not a given declarator node has its initializer.
+ * @param {ASTNode} node A declarator node to check.
+ * @returns {boolean} `true` when the node has its initializer.
+ */
+function isInitialized(node) {
+    const declaration = node.parent;
+    const block = declaration.parent;
+
+    if (isForLoop(block)) {
+        if (block.type === "ForStatement") {
+            return block.init === declaration;
+        }
+        return block.left === declaration;
+    }
+    return Boolean(node.init);
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "require or disallow initialization in variable declarations",
+            category: "Variables",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/init-declarations"
+        },
+
+        schema: {
+            anyOf: [
+                {
+                    type: "array",
+                    items: [
+                        {
+                            enum: ["always"]
+                        }
+                    ],
+                    minItems: 0,
+                    maxItems: 1
+                },
+                {
+                    type: "array",
+                    items: [
+                        {
+                            enum: ["never"]
+                        },
+                        {
+                            type: "object",
+                            properties: {
+                                ignoreForLoopInit: {
+                                    type: "boolean"
+                                }
+                            },
+                            additionalProperties: false
+                        }
+                    ],
+                    minItems: 0,
+                    maxItems: 2
+                }
+            ]
+        },
+        messages: {
+            initialized: "Variable '{{idName}}' should be initialized on declaration.",
+            notInitialized: "Variable '{{idName}}' should not be initialized on declaration."
+        }
+    },
+
+    create(context) {
+
+        const MODE_ALWAYS = "always",
+            MODE_NEVER = "never";
+
+        const mode = context.options[0] || MODE_ALWAYS;
+        const params = context.options[1] || {};
+
+        //--------------------------------------------------------------------------
+        // Public API
+        //--------------------------------------------------------------------------
+
+        return {
+            "VariableDeclaration:exit"(node) {
+
+                const kind = node.kind,
+                    declarations = node.declarations;
+
+                for (let i = 0; i < declarations.length; ++i) {
+                    const declaration = declarations[i],
+                        id = declaration.id,
+                        initialized = isInitialized(declaration),
+                        isIgnoredForLoop = params.ignoreForLoopInit && isForLoop(node.parent);
+                    let messageId = "";
+
+                    if (mode === MODE_ALWAYS && !initialized) {
+                        messageId = "initialized";
+                    } else if (mode === MODE_NEVER && kind !== "const" && initialized && !isIgnoredForLoop) {
+                        messageId = "notInitialized";
+                    }
+
+                    if (id.type === "Identifier" && messageId) {
+                        context.report({
+                            node: declaration,
+                            messageId,
+                            data: {
+                                idName: id.name
+                            }
+                        });
+                    }
+                }
+            }
+        };
+    }
+};