validate-theme-config-announcement-bar-is-closeable

Require static themeConfig.announcementBar.isCloseable values to use booleans.

Targeted pattern scope

This rule targets docusaurus.config.* files and inspects themeConfig.announcementBar.isCloseable.

What this rule reports

This rule reports static non-boolean values for isCloseable, including string forms like "true" and "false".

Why this rule exists

Boolean flags are clearer and less error-prone than stringly-typed values in plain JavaScript config.

❌ Incorrect

export default {
    themeConfig: {
        announcementBar: { isCloseable: "true" },
    },
};

✅ Correct

export default {
    themeConfig: {
        announcementBar: { isCloseable: true },
    },
};

Behavior and migration notes

This rule autofixes direct string booleans to real boolean literals.

For other invalid static values, it reports and provides suggestions to set the flag to true or false.

When not to use it

Do not use this rule if your project intentionally injects non-boolean flag values for later transformation.

Rule catalog ID: R087

Further reading

• Docusaurus announcement bar configuration