oxc-project/oxc · warning · OxcDiagnostic

Unexpected multiple arguments.

Error message

Unexpected multiple arguments.

What it means

The vue/no-multiple-slot-args rule reports scoped-slot functions called with more than one argument. Vue scoped slots (rendered via `this.$slots.default(...)` or slot functions) pass exactly one argument — the slot props object. Extra arguments are silently ignored, so passing several values positionally is always a bug. The diagnostic 'Unexpected multiple arguments.' tells you to pass only one argument to the slot function.

Source

Thrown at crates/oxc_linter/src/rules/vue/no_multiple_slot_args.rs:18

use oxc_ast::{
    AstKind,
    ast::{
        AssignmentTarget, Expression, IdentifierReference, MemberExpression,
        VariableDeclarationKind,
    },
};
use oxc_diagnostics::OxcDiagnostic;
use oxc_macros::declare_oxc_lint;
use oxc_span::{GetSpan, Span};

use crate::{
    AstNode, ast_util::variable_declaration_kind, context::LintContext,
    frameworks::FrameworkOptions, rule::Rule,
};

fn multiple_arguments_diagnostic(span: Span) -> OxcDiagnostic {
    OxcDiagnostic::warn("Unexpected multiple arguments.")
        .with_help("Pass only one argument to the slot function.")
        .with_label(span)
}

fn spread_argument_diagnostic(span: Span) -> OxcDiagnostic {
    OxcDiagnostic::warn("Unexpected spread argument.")
        .with_help("Do not use spread arguments when calling slot functions.")
        .with_label(span)
}

#[derive(Debug, Default, Clone)]
pub struct NoMultipleSlotArgs;

declare_oxc_lint!(
    /// ### What it does
    ///
    /// Disallow passing multiple arguments to scoped slots.
    ///

View on GitHub (pinned to e1e7af627c)

Solutions

1. Collapse all values into a single object argument: `this.$slots.default({ item, index })`.
2. Destructure the props object in the template consumer: `<template #default="{ item, index }">`.
3. Audit other slot calls in the same render function for the same positional-argument mistake.
4. Re-run oxlint to confirm.

Example fix

// before (render function)
h('ul', this.items.map((item, index) =>
  this.$slots.default(item, index) // Unexpected multiple arguments.
))

// after
h('ul', this.items.map((item, index) =>
  this.$slots.default({ item, index })
))

When it happens

Trigger: Calling a scoped-slot function with two or more arguments, e.g. `this.$slots.default(item, index)` in a render function, or `slots.default(a, b)` in a functional/TSX component.

Common situations: Porting render-code that assumed slot fns behave like normal callbacks with positional params; trying to pass `item` and `index` from a `v-for` to a slot in a hand-written render function; wrapping slots in higher-order components.

Related errors

• Unexpected spread argument.
• capacity overflow
• Change to `throw new TypeError(...)`
• Could not find the reuseWorker option in ${path}
• `VirtualFree` failed during cleanup: {err}

AI-assisted analysis of oxc-project/oxc@e1e7af627c (2026-08-20). Data as JSON: /api/errors/6e8d31ed5b3b73de. Report an issue: GitHub.