@redocly/openapi-core/lib/rules/oas3/no-unused-components.js

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

import { isRef } from '../../ref-utils.js';
export const NoUnusedComponents = () => {
    const components = new Map();
    function registerComponent(location, name, referencesDiscriminator = false) {
        components.set(location.absolutePointer, {
            used: components.get(location.absolutePointer)?.used || false,
            referencesDiscriminator,
            location,
            name,
        });
    }
    return {
        ref(ref, { type, resolve, key, location }) {
            if ([
                'Schema',
                'Header',
                'Parameter',
                'Response',
                'Example',
                'RequestBody',
                'MediaTypesMap',
            ].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 && !usageInfo.referencesDiscriminator) {
                        report({
                            message: `Component: "${usageInfo.name}" is never used.`,
                            location: usageInfo.location.key(),
                            reference: 'https://redocly.com/docs/cli/rules/oas/no-unused-components',
                        });
                    }
                });
            },
        },
        NamedSchemas: {
            Schema(schema, { location, key, resolve }) {
                const referencesDiscriminator = schema.allOf?.some((ref) => isRef(ref) && resolve(ref)?.node?.discriminator);
                registerComponent(location, key.toString(), referencesDiscriminator);
            },
        },
        NamedParameters: {
            Parameter(_parameter, { location, key }) {
                registerComponent(location, key.toString());
            },
        },
        NamedResponses: {
            Response(_response, { location, key }) {
                registerComponent(location, key.toString());
            },
        },
        NamedExamples: {
            Example(_example, { location, key }) {
                registerComponent(location, key.toString());
            },
        },
        NamedRequestBodies: {
            RequestBody(_requestBody, { location, key }) {
                registerComponent(location, key.toString());
            },
        },
        NamedHeaders: {
            Header(_header, { location, key }) {
                registerComponent(location, key.toString());
            },
        },
        NamedMediaTypes: {
            MediaTypesMap(_mediaTypesMap, { location, key }) {
                registerComponent(location, key.toString());
            },
        },
    };
};
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