oxc-project/oxc · warning · OxcDiagnostic

Add a `./` prefix to the relative URL.

Error message

Add a `./` prefix to the relative URL.

What it means

This is the `always` diagnostic of oxlint's `unicorn/relative-url-style` rule. When the rule is configured with `"always"`, it flips direction and flags relative URL strings that lack the `./` prefix — `new URL('foo', base)` — asking you to add `./` so the value visually announces itself as relative rather than absolute-ish.

Source

Thrown at crates/oxc_linter/src/rules/unicorn/relative_url_style.rs:24

use oxc_macros::declare_oxc_lint;
use oxc_span::Span;
use schemars::JsonSchema;
use serde::{Deserialize, Serialize};
use url::Url;

use crate::{
    AstNode,
    ast_util::is_new_expression,
    context::LintContext,
    rule::{DefaultRuleConfig, Rule},
};

fn never_diagnostic(span: Span) -> OxcDiagnostic {
    OxcDiagnostic::warn("Remove the `./` prefix from the relative URL.").with_label(span)
}

fn always_diagnostic(span: Span) -> OxcDiagnostic {
    OxcDiagnostic::warn("Add a `./` prefix to the relative URL.").with_label(span)
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, JsonSchema, Default)]
#[serde(rename_all = "kebab-case")]
pub enum RelativeUrlStyleConfig {
    #[default]
    /// Never use a `./` prefix.
    Never,
    /// Always add a `./` prefix to the relative URL when possible.
    Always,
}

#[derive(Debug, Default, Clone, JsonSchema, Deserialize)]
pub struct RelativeUrlStyle(RelativeUrlStyleConfig);

declare_oxc_lint!(
    /// ### What it does
    ///

View on GitHub (pinned to e1e7af627c)

Solutions

1. Add the prefix: `new URL('./foo', base)`.
2. If the mass of warnings is unwanted, revert config to the default `"never"` (or disable the rule) in `.oxlintrc.json`.
3. Run `oxlint --fix` under the `always` config to add prefixes in bulk.

Example fix

// before
const u = new URL('api/v1/users', baseUrl);

// after
const u = new URL('./api/v1/users', baseUrl);

// Same rule, opposite config: make the prefix mandatory
// .oxlintrc.json:
// "unicorn/relative-url-style": ["error", "always"]
const u = new URL('./api/v1/users', baseUrl);

When it happens

Trigger: A string-literal first argument to `new URL('path', base)` classified as a relative URL without a leading `./`, while the rule config is set to `RelativeUrlStyleConfig::Always` in `.oxlintrc.json`. URLs that cannot take the prefix (absolute, scheme-bearing) are exempt.

Common situations: The same codebase gets opposite diagnostics depending on config; someone changed `relative-url-style` from the default `never` to `always`, and every previously-clean `new URL('foo', base)` now reports. The fix is mechanical, and the choice is purely a team style decision.

Related errors

• Remove the `./` prefix from the relative URL.
• Prefer `{} {}` over `{} {}` to check {}.
• Invalid escape sequence in template literal.
• No spaces inside empty pair of braces allowed
• Use uppercase characters for the value of the escape sequenc

AI-assisted analysis of oxc-project/oxc@e1e7af627c (2026-08-20). Data as JSON: /api/errors/6a817b6d1e7c3142. Report an issue: GitHub.