eslint-plugin-esm/dist/rules/required-exports.js

ESLint plugin for linting ESM (import/export syntax)

import { createRule, DEFAULT_MESSAGE_ID, getRuleName } from "../common.js";
export const requiredExports = createRule({
    name: getRuleName(import.meta.url),
    message: "It's required at least one `export` statement in a file.",
    create: (context) => {
        let existExport = false;
        const hasExport = () => {
            existExport = true;
        };
        return {
            ExportAllDeclaration: () => hasExport(),
            ExportDefaultDeclaration: () => hasExport(),
            ExportNamedDeclaration: () => hasExport(),
            "Program:exit": (node) => {
                if (!existExport) {
                    context.report({ node, messageId: DEFAULT_MESSAGE_ID });
                }
            },
        };
    },
});
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