Remove Console Example

Remove all console.log() calls from your JavaScript code.

Code

plugin RemoveConsole {
    fn visit_call_expression(node: &mut CallExpression, ctx: &Context) {
        // Check if this is a console.log call
        if let Callee::MemberExpression(ref member) = node.callee {
            if let Expression::Identifier(ref obj) = *member.object {
                if obj.name == "console" {
                    if let Expression::Identifier(ref prop) = *member.property {
                        if prop.name == "log" {
                            ctx.remove();
                        }
                    }
                }
            }
        }
    }
}

Input

console.log("Starting...");
doWork();
console.log("Done!");

Output

doWork();

How It Works

1. visit_call_expression is called for every function call
2. Use nested if let to check if callee is a member expression
3. Check if the object is an identifier named "console"
4. Check if the property is an identifier named "log"
5. If all conditions match, call ctx.remove() to remove the statement

Variations

Remove All Console Methods

fn visit_call_expression(node: &mut CallExpression, ctx: &Context) {
    if let Callee::MemberExpression(ref member) = node.callee {
        if let Expression::Identifier(ref obj) = *member.object {
            if obj.name == "console" {
                // Remove any console.* call
                ctx.remove();
            }
        }
    }
}

Remove Specific Methods

fn visit_call_expression(node: &mut CallExpression, ctx: &Context) {
    if let Callee::MemberExpression(ref member) = node.callee {
        if let Expression::Identifier(ref obj) = *member.object {
            if obj.name == "console" {
                if let Expression::Identifier(ref prop) = *member.property {
                    if prop.name == "log" || prop.name == "debug" {
                        ctx.remove();
                    }
                }
            }
        }
    }
}

Back to Examples