Repository: eslint/eslint
File: lib/rules/no-console.js (JavaScript)

Code before:
                !isAllowed(parent)
            );
        }

        /**
         * Reports the given reference as a violation.
         * @param {eslint-scope.Reference} reference The reference to report.
         * @returns {void}
         */
        function report(reference) {
            const node = reference.identifier.parent;

            const propertyName = astUtils.getStaticPropertyName(node);

            context.report({
                node,
                loc: node.loc,
                messageId: "unexpected",
                suggest: [
                    {
                        messageId: "removeConsole",
                        data: { propertyName },
                        fix(fixer) {
                            const copyOfStatementListParents = astUtils.STATEMENT_LIST_PARENTS;

                            copyOfStatementListParents.delete("Program");

                            const isNotFixable = copyOfStatementListParents.has(node.parent.parent.parent.type);

                            if (isNotFixable) {
                                return null;
                            }

                            return fixer.removeRange(node.parent.parent.range);
                        }
                    }
                ]
            });
        }

        return {
            "Program:exit"(node) {
                const scope = sourceCode.getScope(node);
                const consoleVar = astUtils.getVariableByName(scope, "console");
                const shadowed = consoleVar && consoleVar.defs.length > 0;

                /*
                 * 'scope.through' includes all references to undefined
                 * variables. If the variable 'console' is not defined, it uses
                 * 'scope.through'.
                 */

Review comment (bug):
This would actually delete `"Program"` from `astUtils.STATEMENT_LIST_PARENTS` because `copyOfStatementListParents` is not really a copy but a reference to the same Set object. This is most likely why some unrelated tests are failing on CI. Anyway, I don't think there's a need to exclude "Program" (see the next comment).

Code after:
                !isAllowed(parent)
            );
        }

        /**
         * Checks if removing the ExpressionStatement node will cause ASI to
         * break.
         * eg.
         * foo()
         * console.log();
         * [1, 2, 3].forEach(a => doSomething(a))
         *
         * Removing the console.log(); statement should leave two statements, but
         * here the two statements will become one because [ causes continuation after
         * foo().
         * @param {ASTNode} node The ExpressionStatement node to check.
         * @returns {boolean} `true` if ASI will break after removing the ExpressionStatement
         *      node.
         */
        function maybeAsiHazard(node) {
            const SAFE_TOKENS_BEFORE = /^[:;{]$/u; // One of :;{
            const UNSAFE_CHARS_AFTER = /^[-[(/+`]/u; // One of [(/+-`

            const tokenBefore = sourceCode.getTokenBefore(node);
            const tokenAfter = sourceCode.getTokenAfter(node);

            return (
                Boolean(tokenAfter) &&
                UNSAFE_CHARS_AFTER.test(tokenAfter.value) &&
                tokenAfter.value !== "++" &&
                tokenAfter.value !== "--" &&
                Boolean(tokenBefore) &&
                !SAFE_TOKENS_BEFORE.test(tokenBefore.value)
            );
        }

        /**
         * Checks if the MemberExpression node's parent.parent.parent is a
         * Program, BlockStatement, StaticBlock, or SwitchCase node. This check
         * is necessary to avoid providing a suggestion that might cause a syntax error.
         *
         * eg. if (a) console.log(b), removing console.log() here will lead to a
         *     syntax error.
         *     if (a) { console.log(b) }, removing console.log() here is acceptable.
         *
         * Additionally, it checks if the callee of the CallExpression node is
         * the node itself.
         *
         * eg. foo(console.log), cannot provide a suggestion here.
         * @param {ASTNode} node The MemberExpression node to check.
         * @returns {boolean} `true` if a suggestion can be provided for a node.