next/dist/server/lib/generate-agent-files.js

The React Framework

/**
 * Create or update AGENTS.md with managed Next.js instructions when `next dev`
 * detects an AI coding agent.
 *
 * Keep the marker and block content in sync with:
 *   - packages/create-next-app/helpers/generate-agent-files.ts
 *   - packages/next-codemod/lib/agents-md.ts
 */ "use strict";
Object.defineProperty(exports, "__esModule", {
    value: true
});
0 && (module.exports = {
    AGENT_FEEDBACK_END_MARKER: null,
    AGENT_FEEDBACK_START_MARKER: null,
    AGENT_RULES_END_MARKER: null,
    AGENT_RULES_START_MARKER: null,
    hasCurrentAgentFeedback: null,
    hasCurrentAgentRules: null,
    removeAgentFeedbackFiles: null,
    removeAgentRulesFiles: null,
    writeAgentFeedbackFiles: null,
    writeAgentFiles: null
});
function _export(target, all) {
    for(var name in all)Object.defineProperty(target, name, {
        enumerable: true,
        get: all[name]
    });
}
_export(exports, {
    AGENT_FEEDBACK_END_MARKER: function() {
        return AGENT_FEEDBACK_END_MARKER;
    },
    AGENT_FEEDBACK_START_MARKER: function() {
        return AGENT_FEEDBACK_START_MARKER;
    },
    AGENT_RULES_END_MARKER: function() {
        return AGENT_RULES_END_MARKER;
    },
    AGENT_RULES_START_MARKER: function() {
        return AGENT_RULES_START_MARKER;
    },
    hasCurrentAgentFeedback: function() {
        return hasCurrentAgentFeedback;
    },
    hasCurrentAgentRules: function() {
        return hasCurrentAgentRules;
    },
    removeAgentFeedbackFiles: function() {
        return removeAgentFeedbackFiles;
    },
    removeAgentRulesFiles: function() {
        return removeAgentRulesFiles;
    },
    writeAgentFeedbackFiles: function() {
        return writeAgentFeedbackFiles;
    },
    writeAgentFiles: function() {
        return writeAgentFiles;
    }
});
const _fs = /*#__PURE__*/ _interop_require_default(require("fs"));
const _path = /*#__PURE__*/ _interop_require_default(require("path"));
function _interop_require_default(obj) {
    return obj && obj.__esModule ? obj : {
        default: obj
    };
}
const AGENT_RULES_START_MARKER = '<!-- BEGIN:nextjs-agent-rules -->';
const AGENT_RULES_END_MARKER = '<!-- END:nextjs-agent-rules -->';
const AGENT_FEEDBACK_START_MARKER = '<!-- BEGIN:nextjs-agent-feedback -->';
const AGENT_FEEDBACK_END_MARKER = '<!-- END:nextjs-agent-feedback -->';
/**
 * Markers written by the pre-bundled-docs version of `agents-md`.
 * Stripped on upsert so projects that ran the old codemod end up with
 * a single current block instead of two stale-and-current blocks.
 */ const LEGACY_AGENT_RULES_START_MARKER = '<!-- NEXT-AGENTS-MD-START -->';
const LEGACY_AGENT_RULES_END_MARKER = '<!-- NEXT-AGENTS-MD-END -->';
function buildAgentRulesBlock() {
    return `${AGENT_RULES_START_MARKER}

## This is NOT the Next.js you know

This version has breaking changes — APIs, conventions, and file structure may all differ from your training data. Read the relevant guide in \`node_modules/next/dist/docs/\` (resolved from this file's directory; in monorepos the \`next\` package may not be visible from the repo root) before writing any code. Heed deprecation notices.

This block is written and re-added by \`next dev\` — verify at \`node_modules/next/dist/server/lib/generate-agent-files.js\`. Removing it from a diff only re-creates the uncommitted change; committing it with your work keeps the tree clean.

${AGENT_RULES_END_MARKER}`;
}
/**
 * The block points agents at `next internal agent-feedback-instructions`.
 * That command is not covered by semver, which is acceptable here because
 * `next dev` rewrites this block whenever the installed version changes it,
 * so a project never keeps an instruction that its own `next` can't serve.
 */ function buildAgentFeedbackBlock() {
    return `${AGENT_FEEDBACK_START_MARKER}

## Report Next.js feedback

The project owner enabled \`experimental.agentFeedback\`, authorizing this feedback pass. When enabled, \`next dev\` writes this block and restores it if removed. Commit \`AGENTS.md\` with your work to keep the tree clean.

During the current user request, retain anonymized facts as feedback candidates for meaningful or recurring Next.js issues:

- Crashes, hangs, OOMs, or unexpected slowness
- Incorrect behavior, output, errors, or diagnostics
- Missing, unclear, or conflicting documentation
- Unexpected CLI, codemod, Skill, or upgrade behavior and non-obvious workarounds

Continue the current user request without reporting immediately. Routine debugging is not feedback. Verify changes before retaining them as feedback candidates. Never retain code, logs, paths, URLs, secrets, personal information, or project-specific data.

Retain qualifying friction even if it is later fixed or worked around; record the final outcome during the reporting pass.

Before the final response, run one reporting pass. If candidates remain, from this file's directory run \`npx --no-install next internal agent-feedback-instructions\` once without piping or truncating its output. Follow its output or error guidance. If a network sandbox blocks it, retry with network access; if it still returns no output, continue normally.

${AGENT_FEEDBACK_END_MARKER}`;
}
/**
 * Returns the managed block (markers included) found in `content`, or
 * `null` when the markers are absent or malformed.
 */ function extractAgentRulesBlock(content) {
    return extractManagedBlock(content, AGENT_RULES_START_MARKER, AGENT_RULES_END_MARKER);
}
function extractManagedBlock(content, startMarker, endMarker) {
    const start = content.indexOf(startMarker);
    if (start === -1) return null;
    const end = content.indexOf(endMarker, start);
    if (end === -1) return null;
    return content.slice(start, end + endMarker.length);
}
function hasCurrentAgentRules(dir) {
    const block = buildAgentRulesBlock();
    const content = tryReadFile(_path.default.join(dir, 'AGENTS.md'));
    if (!content) return false;
    const installed = extractAgentRulesBlock(content);
    return installed !== null && normalizeEol(installed, '\n') === block;
}
function hasCurrentAgentFeedback(dir) {
    const block = buildAgentFeedbackBlock();
    const content = tryReadFile(_path.default.join(dir, 'AGENTS.md'));
    if (!content) return false;
    const installed = extractManagedBlock(content, AGENT_FEEDBACK_START_MARKER, AGENT_FEEDBACK_END_MARKER);
    return installed !== null && normalizeEol(installed, '\n') === block;
}
function writeAgentFiles(projectDir) {
    const agentsMdPath = _path.default.join(projectDir, 'AGENTS.md');
    const block = buildAgentRulesBlock();
    if (_fs.default.existsSync(agentsMdPath)) {
        return {
            agentsMd: upsertFile(agentsMdPath, block)
        };
    }
    _fs.default.writeFileSync(agentsMdPath, block + '\n', 'utf-8');
    return {
        agentsMd: 'created'
    };
}
function writeAgentFeedbackFiles(projectDir) {
    const agentsMdPath = _path.default.join(projectDir, 'AGENTS.md');
    const block = buildAgentFeedbackBlock();
    if (_fs.default.existsSync(agentsMdPath)) {
        return {
            agentsMd: upsertFeedbackFile(agentsMdPath, block)
        };
    }
    _fs.default.writeFileSync(agentsMdPath, block + '\n', 'utf-8');
    return {
        agentsMd: 'created'
    };
}
function removeAgentFeedbackFiles(projectDir) {
    return {
        agentsMd: removeManagedBlockFromFile(_path.default.join(projectDir, 'AGENTS.md'), AGENT_FEEDBACK_START_MARKER, AGENT_FEEDBACK_END_MARKER)
    };
}
function removeAgentRulesFiles(projectDir) {
    return {
        agentsMd: removeManagedBlockFromFile(_path.default.join(projectDir, 'AGENTS.md'), AGENT_RULES_START_MARKER, AGENT_RULES_END_MARKER)
    };
}
// ---------------------------------------------------------------------------
// Internal helpers
// ---------------------------------------------------------------------------
function tryReadFile(filePath) {
    try {
        return _fs.default.readFileSync(filePath, 'utf-8');
    } catch  {
        return null;
    }
}
function upsertFile(filePath, block) {
    const existing = _fs.default.readFileSync(filePath, 'utf-8');
    const updated = upsertAgentRulesBlock(existing, block);
    if (updated === existing) return 'unchanged';
    _fs.default.writeFileSync(filePath, updated, 'utf-8');
    return 'updated';
}
function upsertFeedbackFile(filePath, block) {
    const existing = _fs.default.readFileSync(filePath, 'utf-8');
    const updated = upsertManagedBlock(existing, block, AGENT_FEEDBACK_START_MARKER, AGENT_FEEDBACK_END_MARKER);
    if (updated === existing) return 'unchanged';
    _fs.default.writeFileSync(filePath, updated, 'utf-8');
    return 'updated';
}
function removeManagedBlockFromFile(filePath, startMarker, endMarker) {
    const existing = tryReadFile(filePath);
    if (existing === null) return 'skipped';
    const updated = removeManagedBlock(existing, startMarker, endMarker);
    if (updated === existing) return 'unchanged';
    if (updated.trim() === '') {
        // Nothing but the managed block lived here, so Next.js effectively owned
        // the file. Leaving a zero-byte AGENTS.md behind is more confusing than
        // removing it.
        _fs.default.unlinkSync(filePath);
    } else {
        _fs.default.writeFileSync(filePath, updated, 'utf-8');
    }
    return 'removed';
}
/**
 * Detect the predominant line-ending style. Returns `'\r\n'` if any
 * CRLF is present, `'\n'` otherwise — avoids mixed EOLs on Windows.
 */ function detectEol(content) {
    return /\r\n/.test(content) ? '\r\n' : '\n';
}
function normalizeEol(s, eol) {
    return s.replace(/\r?\n/g, eol);
}
function upsertAgentRulesBlock(existing, block) {
    const eol = detectEol(existing);
    const normalizedBlock = normalizeEol(block, eol);
    existing = stripLegacyAgentRulesBlock(existing, eol);
    const startIdx = existing.indexOf(AGENT_RULES_START_MARKER);
    const endIdx = existing.indexOf(AGENT_RULES_END_MARKER);
    if (startIdx !== -1 && endIdx !== -1 && endIdx > startIdx) {
        const before = existing.slice(0, startIdx);
        const after = existing.slice(endIdx + AGENT_RULES_END_MARKER.length);
        const replaced = before + normalizedBlock + after;
        return replaced === existing ? existing : replaced;
    }
    const separator = existing.length === 0 || /\r?\n$/.test(existing) ? eol : eol + eol;
    return existing + separator + normalizedBlock + eol;
}
function upsertManagedBlock(existing, block, startMarker, endMarker) {
    const eol = detectEol(existing);
    const normalizedBlock = normalizeEol(block, eol);
    const startIdx = existing.indexOf(startMarker);
    const endIdx = existing.indexOf(endMarker, startIdx);
    if (startIdx !== -1 && endIdx !== -1 && endIdx > startIdx) {
        const before = existing.slice(0, startIdx);
        const after = existing.slice(endIdx + endMarker.length);
        return before + normalizedBlock + after;
    }
    const separator = existing.length === 0 || /\r?\n$/.test(existing) ? eol : eol + eol;
    return existing + separator + normalizedBlock + eol;
}
function removeManagedBlock(existing, startMarker, endMarker) {
    const startIdx = existing.indexOf(startMarker);
    if (startIdx === -1) return existing;
    const endIdx = existing.indexOf(endMarker, startIdx);
    if (endIdx === -1) return existing;
    let cutStart = startIdx;
    while(cutStart > 0 && /[\t ]/.test(existing[cutStart - 1]))cutStart--;
    if (cutStart > 0 && existing[cutStart - 1] === '\n') {
        cutStart--;
        if (cutStart > 0 && existing[cutStart - 1] === '\r') cutStart--;
    }
    let cutEnd = endIdx + endMarker.length;
    while(cutEnd < existing.length && /[\t ]/.test(existing[cutEnd]))cutEnd++;
    if (existing[cutEnd] === '\r') cutEnd++;
    if (existing[cutEnd] === '\n') cutEnd++;
    // A block at the very top has no preceding newline to absorb, so also drop
    // the blank line that separated it from the content below. Otherwise the
    // file would start with an empty line.
    if (cutStart === 0) {
        if (existing[cutEnd] === '\r') cutEnd++;
        if (existing[cutEnd] === '\n') cutEnd++;
    }
    const before = existing.slice(0, cutStart);
    const after = existing.slice(cutEnd);
    const separator = before.length > 0 && after.length > 0 && !before.endsWith('\n') && !after.startsWith('\r') && !after.startsWith('\n') ? detectEol(existing) : '';
    return before + separator + after;
}
function stripLegacyAgentRulesBlock(existing, eol = '\n') {
    while(true){
        const startIdx = existing.indexOf(LEGACY_AGENT_RULES_START_MARKER);
        if (startIdx === -1) return existing;
        const endIdx = existing.indexOf(LEGACY_AGENT_RULES_END_MARKER, startIdx);
        if (endIdx === -1) return existing;
        let cutStart = startIdx;
        while(cutStart > 0 && /\s/.test(existing[cutStart - 1])){
            cutStart--;
        }
        let cutEnd = endIdx + LEGACY_AGENT_RULES_END_MARKER.length;
        while(cutEnd < existing.length && /\s/.test(existing[cutEnd])){
            cutEnd++;
        }
        const before = existing.slice(0, cutStart);
        const after = existing.slice(cutEnd);
        existing = before.length > 0 && after.length > 0 ? before + eol + eol + after : before + after;
    }
}

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