validate-theme-config-footer-style

Require static themeConfig.footer.style values to use supported Docusaurus footer styles.

Targeted pattern scope

This rule targets docusaurus.config.* files and inspects themeConfig.footer.style.

What this rule reports

This rule reports static footer style values that are invalid or use non-canonical casing/whitespace.

Why this rule exists

Footer style values affect the public appearance of the site footer and should stay within Docusaurus' supported set.

❌ Incorrect

export default {
    themeConfig: {
        footer: { style: "Light" },
    },
};

export default {
    themeConfig: {
        footer: { style: "primary" },
    },
};

✅ Correct

export default {
    themeConfig: {
        footer: { style: "light" },
    },
};

export default {
    themeConfig: {
        footer: { style: "dark" },
    },
};

Behavior and migration notes

This rule autofixes valid-but-noncanonical static strings such as "Light".

For invalid static values, it reports and provides suggestions to set the style to "light" or "dark".

When not to use it

Do not use this rule if your project intentionally injects nonstandard footer style values through a later transform step.

Rule catalog ID: R081

Further reading

• Docusaurus theme config footer