@redocly/openapi-core/lib/rules/openrpc/no-unused-components.js

See https://github.com/Redocly/redocly-cli

export const NoUnusedComponents = () => {
    const components = new Map();
    function registerComponent(location, name) {
        components.set(location.absolutePointer, {
            used: components.get(location.absolutePointer)?.used || false,
            location,
            name,
        });
    }
    return {
        ref(ref, { type, resolve, key, location }) {
            if ([
                'Schema',
                'ContentDescriptor',
                'Example',
                'Link',
                'ErrorObject',
                'ExamplePairing',
                'Tag',
            ].includes(type.name)) {
                const resolvedRef = resolve(ref);
                if (!resolvedRef.location)
                    return;
                components.set(resolvedRef.location.absolutePointer, {
                    used: true,
                    name: key.toString(),
                    location,
                });
            }
        },
        Root: {
            leave(_, { report }) {
                components.forEach((usageInfo) => {
                    if (!usageInfo.used) {
                        report({
                            message: `Component: "${usageInfo.name}" is never used.`,
                            location: usageInfo.location.key(),
                        });
                    }
                });
            },
        },
        NamedSchemas: {
            Schema(schema, { location, key }) {
                if (!schema.allOf) {
                    registerComponent(location, key.toString());
                }
            },
        },
        NamedContentDescriptors: {
            ContentDescriptor(_node, { location, key }) {
                registerComponent(location, key.toString());
            },
        },
        NamedExamples: {
            Example(_node, { location, key }) {
                registerComponent(location, key.toString());
            },
        },
        NamedLinks: {
            Link(_node, { location, key }) {
                registerComponent(location, key.toString());
            },
        },
        NamedErrors: {
            ErrorObject(_node, { location, key }) {
                registerComponent(location, key.toString());
            },
        },
        NamedExamplePairingObjects: {
            ExamplePairing(_node, { location, key }) {
                registerComponent(location, key.toString());
            },
        },
        NamedTags: {
            Tag(_node, { location, key }) {
                registerComponent(location, key.toString());
            },
        },
    };
};
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