first commit

app_vue/node_modules/eslint/lib/rules/no-implicit-globals.js

@@ -0,0 +1,140 @@
+/**
+ * @fileoverview Rule to check for implicit global variables, functions and classes.
+ * @author Joshua Peek
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "disallow declarations in the global scope",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/no-implicit-globals"
+        },
+
+        schema: [{
+            type: "object",
+            properties: {
+                lexicalBindings: {
+                    type: "boolean",
+                    default: false
+                }
+            },
+            additionalProperties: false
+        }],
+
+        messages: {
+            globalNonLexicalBinding: "Unexpected {{kind}} declaration in the global scope, wrap in an IIFE for a local variable, assign as global property for a global variable.",
+            globalLexicalBinding: "Unexpected {{kind}} declaration in the global scope, wrap in a block or in an IIFE.",
+            globalVariableLeak: "Global variable leak, declare the variable if it is intended to be local.",
+            assignmentToReadonlyGlobal: "Unexpected assignment to read-only global variable.",
+            redeclarationOfReadonlyGlobal: "Unexpected redeclaration of read-only global variable."
+        }
+    },
+
+    create(context) {
+
+        const checkLexicalBindings = context.options[0] && context.options[0].lexicalBindings === true;
+
+        /**
+         * Reports the node.
+         * @param {ASTNode} node Node to report.
+         * @param {string} messageId Id of the message to report.
+         * @param {string|undefined} kind Declaration kind, can be 'var', 'const', 'let', function or class.
+         * @returns {void}
+         */
+        function report(node, messageId, kind) {
+            context.report({
+                node,
+                messageId,
+                data: {
+                    kind
+                }
+            });
+        }
+
+        return {
+            Program() {
+                const scope = context.getScope();
+
+                scope.variables.forEach(variable => {
+
+                    // Only ESLint global variables have the `writable` key.
+                    const isReadonlyEslintGlobalVariable = variable.writeable === false;
+                    const isWritableEslintGlobalVariable = variable.writeable === true;
+
+                    if (isWritableEslintGlobalVariable) {
+
+                        // Everything is allowed with writable ESLint global variables.
+                        return;
+                    }
+
+                    variable.defs.forEach(def => {
+                        const defNode = def.node;
+
+                        if (def.type === "FunctionName" || (def.type === "Variable" && def.parent.kind === "var")) {
+                            if (isReadonlyEslintGlobalVariable) {
+                                report(defNode, "redeclarationOfReadonlyGlobal");
+                            } else {
+                                report(
+                                    defNode,
+                                    "globalNonLexicalBinding",
+                                    def.type === "FunctionName" ? "function" : `'${def.parent.kind}'`
+                                );
+                            }
+                        }
+
+                        if (checkLexicalBindings) {
+                            if (def.type === "ClassName" ||
+                                    (def.type === "Variable" && (def.parent.kind === "let" || def.parent.kind === "const"))) {
+                                if (isReadonlyEslintGlobalVariable) {
+                                    report(defNode, "redeclarationOfReadonlyGlobal");
+                                } else {
+                                    report(
+                                        defNode,
+                                        "globalLexicalBinding",
+                                        def.type === "ClassName" ? "class" : `'${def.parent.kind}'`
+                                    );
+                                }
+                            }
+                        }
+                    });
+                });
+
+                // Undeclared assigned variables.
+                scope.implicit.variables.forEach(variable => {
+                    const scopeVariable = scope.set.get(variable.name);
+                    let messageId;
+
+                    if (scopeVariable) {
+
+                        // ESLint global variable
+                        if (scopeVariable.writeable) {
+                            return;
+                        }
+                        messageId = "assignmentToReadonlyGlobal";
+
+                    } else {
+
+                        // Reference to an unknown variable, possible global leak.
+                        messageId = "globalVariableLeak";
+                    }
+
+                    // def.node is an AssignmentExpression, ForInStatement or ForOfStatement.
+                    variable.defs.forEach(def => {
+                        report(def.node, messageId);
+                    });
+                });
+            }
+        };
+
+    }
+};