vt-dep

Val Town-native dependency analyzer for small JS/TS projects.

API

POST /analyze\ncontent-type: application/json\n\n{\n  \"files\": {\n    \"main.ts\": \"import { helper } from './helper.ts';\",\n    \"helper.ts\": \"export const helper = 1;\"\n  }\n}

Try /sample or /sample/mermaid.

\n \n`;\n}\n\nexport default handleRequest;\n\nexport const sample = analyzeVals({\n \"main.ts\": `\n import { helper } from \"./helper.ts\";\n import lodash from \"npm:lodash\";\n const dynamic = await import(\"./dynamic.ts\");\n console.log(helper, lodash, dynamic);\n `,\n \"helper.ts\": `\n export { cycle } from \"./cycle\";\n export const helper = 1;\n `,\n \"cycle.ts\": `\n import \"./helper.ts\";\n export const cycle = true;\n `,\n \"dynamic.ts\": `\n import { email } from \"https://esm.town/v/chad/email\";\n export default email;\n `,\n});\n","label",[134],"87ed3c64-5335-11f1-8884-ee650bb23af1","deno.lock","ac25d74e-5330-11f1-a1ae-ee650bb23af1",21,["D",1779162480383],1,"{\n \"version\": \"5\",\n \"specifiers\": {\n \"npm:@babel/parser@*\": \"7.29.3\",\n \"npm:@babel/traverse@*\": \"7.29.0\",\n \"npm:@valtown/sdk@1.9.0\": \"1.9.0\",\n \"npm:badge-maker@*\": \"5.0.2\",\n \"npm:hono@4.11.9\": \"4.11.9\",\n \"npm:mime-types@2.1.35\": \"2.1.35\",\n \"npm:preact-render-to-string@*\": \"6.7.0_preact@10.29.2\",\n \"npm:preact@*\": \"10.29.2\",\n \"npm:pretty-ms@*\": \"9.3.0\"\n },\n \"npm\": {\n \"@babel/code-frame@7.29.0\": {\n \"integrity\": \"sha512-9NhCeYjq9+3uxgdtp20LSiJXJvN0FeCtNGpJxuMFZ1Kv3cWUNb6DOhJwUvcVCzKGR66cw4njwM6hrJLqgOwbcw==\",\n \"dependencies\": [\n \"@babel/helper-validator-identifier\",\n \"js-tokens\",\n \"picocolors\"\n ]\n },\n \"@babel/generator@7.29.1\": {\n \"integrity\": \"sha512-qsaF+9Qcm2Qv8SRIMMscAvG4O3lJ0F1GuMo5HR/Bp02LopNgnZBC/EkbevHFeGs4ls/oPz9v+Bsmzbkbe+0dUw==\",\n \"dependencies\": [\n \"@babel/parser\",\n \"@babel/types\",\n \"@jridgewell/gen-mapping\",\n \"@jridgewell/trace-mapping\",\n \"jsesc\"\n ]\n },\n \"@babel/helper-globals@7.28.0\": {\n \"integrity\": \"sha512-+W6cISkXFa1jXsDEdYA8HeevQT/FULhxzR99pxphltZcVaugps53THCeiWA8SguxxpSp3gKPiuYfSWopkLQ4hw==\"\n },\n \"@babel/helper-string-parser@7.27.1\": {\n \"integrity\": \"sha512-qMlSxKbpRlAridDExk92nSobyDdpPijUq2DW6oDnUqd0iOGxmQjyqhMIihI9+zv4LPyZdRje2cavWPbCbWm3eA==\"\n },\n \"@babel/helper-validator-identifier@7.28.5\": {\n \"integrity\": \"sha512-qSs4ifwzKJSV39ucNjsvc6WVHs6b7S03sOh2OcHF9UHfVPqWWALUsNUVzhSBiItjRZoLHx7nIarVjqKVusUZ1Q==\"\n },\n \"@babel/parser@7.29.3\": {\n \"integrity\": \"sha512-b3ctpQwp+PROvU/cttc4OYl4MzfJUWy6FZg+PMXfzmt/+39iHVF0sDfqay8TQM3JA2EUOyKcFZt75jWriQijsA==\",\n \"dependencies\": [\n \"@babel/types\"\n ],\n \"bin\": true\n },\n \"@babel/template@7.28.6\": {\n \"integrity\": \"sha512-YA6Ma2KsCdGb+WC6UpBVFJGXL58MDA6oyONbjyF/+5sBgxY/dwkhLogbMT2GXXyU84/IhRw/2D1Os1B/giz+BQ==\",\n \"dependencies\": [\n \"@babel/code-frame\",\n \"@babel/parser\",\n \"@babel/types\"\n ]\n },\n \"@babel/traverse@7.29.0\": {\n \"integrity\": \"sha512-4HPiQr0X7+waHfyXPZpWPfWL/J7dcN1mx9gL6WdQVMbPnF3+ZhSMs8tCxN7oHddJE9fhNE7+lxdnlyemKfJRuA==\",\n \"dependencies\": [\n \"@babel/code-frame\",\n \"@babel/generator\",\n \"@babel/helper-globals\",\n \"@babel/parser\",\n \"@babel/template\",\n \"@babel/types\",\n \"debug\"\n ]\n },\n \"@babel/types@7.29.0\": {\n \"integrity\": \"sha512-LwdZHpScM4Qz8Xw2iKSzS+cfglZzJGvofQICy7W7v4caru4EaAmyUuO6BGrbyQ2mYV11W0U8j5mBhd14dd3B0A==\",\n \"dependencies\": [\n \"@babel/helper-string-parser\",\n \"@babel/helper-validator-identifier\"\n ]\n },\n \"@jridgewell/gen-mapping@0.3.13\": {\n \"integrity\": \"sha512-2kkt/7niJ6MgEPxF0bYdQ6etZaA+fQvDcLKckhy1yIQOzaoKjBBjSj63/aLVjYE3qhRt5dvM+uUyfCg6UKCBbA==\",\n \"dependencies\": [\n \"@jridgewell/sourcemap-codec\",\n \"@jridgewell/trace-mapping\"\n ]\n },\n \"@jridgewell/resolve-uri@3.1.2\": {\n \"integrity\": \"sha512-bRISgCIjP20/tbWSPWMEi54QVPRZExkuD9lJL+UIxUKtwVJA8wW1Trb1jMs1RFXo1CBTNZ/5hpC9QvmKWdopKw==\"\n },\n \"@jridgewell/sourcemap-codec@1.5.5\": {\n \"integrity\": \"sha512-cYQ9310grqxueWbl+WuIUIaiUaDcj7WOq5fVhEljNVgRfOUhY9fy2zTvfoqWsnebh8Sl70VScFbICvJnLKB0Og==\"\n },\n \"@jridgewell/trace-mapping@0.3.31\": {\n \"integrity\": \"sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw==\",\n \"dependencies\": [\n \"@jridgewell/resolve-uri\",\n \"@jridgewell/sourcemap-codec\"\n ]\n },\n \"@types/node-fetch@2.6.13\": {\n \"integrity\": \"sha512-QGpRVpzSaUs30JBSGPjOg4Uveu384erbHBoT1zeONvyCfwQxIkUshLAOqN/k9EjGviPRmWTTe6aH2qySWKTVSw==\",\n \"dependencies\": [\n \"@types/node\",\n \"form-data\"\n ]\n },\n \"@types/node@18.19.130\": {\n \"integrity\": \"sha512-GRaXQx6jGfL8sKfaIDD6OupbIHBr9jv7Jnaml9tB7l4v068PAOXqfcujMMo5PhbIs6ggR1XODELqahT2R8v0fg==\",\n \"dependencies\": [\n \"undici-types\"\n ]\n },\n \"@valtown/sdk@1.9.0\": {\n \"integrity\": \"sha512-xV8B02a+IJZYkxMk7CVS5hcNjyJ2XhZvJ3iXxqaILVbNsaq9BCAzSvYS+GteaFxG0OO9YiWSSNh68047o+Rk+g==\",\n \"dependencies\": [\n \"@types/node\",\n \"@types/node-fetch\",\n \"abort-controller\",\n \"agentkeepalive\",\n \"form-data-encoder\",\n \"formdata-node\",\n \"node-fetch\"\n ]\n },\n \"abort-controller@3.0.0\": {\n \"integrity\": \"sha512-h8lQ8tacZYnR3vNQTgibj+tODHI5/+l06Au2Pcriv/Gmet0eaj4TwWH41sO9wnHDiQsEj19q0drzdWdeAHtweg==\",\n \"dependencies\": [\n \"event-target-shim\"\n ]\n },\n \"agentkeepalive@4.6.0\": {\n \"integrity\": \"sha512-kja8j7PjmncONqaTsB8fQ+wE2mSU2DJ9D4XKoJ5PFWIdRMa6SLSN1ff4mOr4jCbfRSsxR4keIiySJU0N9T5hIQ==\",\n \"dependencies\": [\n \"humanize-ms\"\n ]\n },\n \"anafanafo@2.0.0\": {\n \"integrity\": \"sha512-Nlfq7NC4AOkTJerWRIZcOAiMNtIDVIGWGvQ98O7Jl6Kr2Dk0dX5u4MqN778kSRTy5KRqchpLdF2RtLFEz9FVkQ==\",\n \"dependencies\": [\n \"char-width-table-consumer\"\n ]\n },\n \"asynckit@0.4.0\": {\n \"integrity\": \"sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==\"\n },\n \"badge-maker@5.0.2\": {\n \"integrity\": \"sha512-Xd3YUmKPEShQcn6PFB03Wxq0RNJRFwVVroyRz0qIjSXwniYUGsGWNHqtNsQYi/Sbs8Ni7qAEf7LKgDOtcAoCDg==\",\n \"dependencies\": [\n \"anafanafo\",\n \"css-color-converter\"\n ],\n \"bin\": true\n },\n \"binary-search@1.3.6\": {\n \"integrity\": \"sha512-nbE1WxOTTrUWIfsfZ4aHGYu5DOuNkbxGokjV6Z2kxfJK3uaAb8zNK1muzOeipoLHZjInT4Br88BHpzevc681xA==\"\n },\n \"call-bind-apply-helpers@1.0.2\": {\n \"integrity\": \"sha512-Sp1ablJ0ivDkSzjcaJdxEunN5/XvksFJ2sMBFfq6x0ryhQV/2b/KwFe21cMpmHtPOSij8K99/wSfoEuTObmuMQ==\",\n \"dependencies\": [\n \"es-errors\",\n \"function-bind\"\n ]\n },\n \"char-width-table-consumer@1.0.0\": {\n \"integrity\": \"sha512-Fz4UD0LBpxPgL9i29CJ5O4KANwaMnX/OhhbxzvNa332h+9+nRKyeuLw4wA51lt/ex67+/AdsoBQJF3kgX2feYQ==\",\n \"dependencies\": [\n \"binary-search\"\n ]\n },\n \"color-convert@0.5.3\": {\n \"integrity\": \"sha512-RwBeO/B/vZR3dfKL1ye/vx8MHZ40ugzpyfeVG5GsiuGnrlMWe2o8wxBbLCpw9CsxV+wHuzYlCiWnybrIA0ling==\"\n },\n \"color-name@1.1.4\": {\n \"integrity\": \"sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==\"\n },\n \"combined-stream@1.0.8\": {\n \"integrity\": \"sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==\",\n \"dependencies\": [\n \"delayed-stream\"\n ]\n },\n \"css-color-converter@2.0.0\": {\n \"integrity\": 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}\n}\n",[145],"ac29fe3c-5330-11f1-a906-ee650bb23af1","deno.json","ac29ff68-5330-11f1-a906-ee650bb23af1",["D",1779160393708],"{\n \"compilerOptions\": {\n \"lib\": [\"deno.ns\", \"dom\", \"esnext\"],\n \"strict\": true\n }\n}\n",[153],"a481c91c-5335-11f1-b941-ee650bb23af1","README.md","6dc04424-532d-11f1-b320-ee650bb23af1",22,["D",1779162528339],"# Val Dependency Cruiser\n\nA small Val Town-native dependency analyzer inspired by\n[`dependency-cruiser`](https://github.com/sverweij/dependency-cruiser), focused\non reading and visualizing dependencies between Vals and small Val Town\nprojects.\n\n## Goal\n\nRun as a Val that can read source for other Vals/projects, extract their\nimports, and produce a useful dependency graph plus a few simple checks.\n\nThis is **not** intended to port all of dependency-cruiser. Full\ndependency-cruiser assumes a local Node project with filesystem crawling,\n`node_modules`, package manifests, config loading, caches, and subprocess-based\ngraph rendering. Val Town projects are smaller and can use a simpler analyzer.\n\n## HTTP endpoint\n\nCurrent endpoint:\n\n```text\nhttps://chadparker--87d29e86533511f18884ee650bb23af1.web.val.run\n```\n\nThis endpoint is provided by `api.http.ts`, which re-exports the handler from\n`main.http.ts`.\n\n## Current API\n\nThe Val exports `analyzeVals(files)` for direct use and also exposes an HTTP\nhandler.\n\n```ts\nimport { analyzeVals } from \"https://esm.town/v/chad/vt_dep\";\n\nconst result = analyzeVals({\n \"main.http.ts\": `import { helper } from \"./helper.ts\";`,\n \"helper.ts\": `export const helper = 1;`,\n});\n```\n\nHTTP:\n\n```http\nPOST /analyze\ncontent-type: application/json\n\n{\n \"files\": {\n \"main.http.ts\": \"import { helper } from './helper.ts';\",\n \"helper.ts\": \"export const helper = 1;\"\n }\n}\n```\n\nOutput:\n\n- dependency graph as JSON\n- detected cycles\n- unresolved imports\n- parse errors\n- external dependencies grouped by type\n- Mermaid graph text for quick visualization\n\nTry:\n\n- `/sample` for example JSON\n- `/sample/mermaid` for example Mermaid output\n\nExample API shape:\n\n```ts\ntype SourceMap = Record;\n\ntype DependencyKind =\n | \"local\"\n | \"val\"\n | \"npm\"\n | \"jsr\"\n | \"url\"\n | \"builtin\"\n | \"unresolved\";\n\ntype Dependency = {\n specifier: string;\n resolved?: string;\n kind: DependencyKind;\n dynamic: boolean;\n};\n\ntype ModuleNode = {\n id: string;\n dependencies: Dependency[];\n};\n\ntype AnalysisResult = {\n modules: ModuleNode[];\n cycles: string[][];\n unresolved: Dependency[];\n externals: Dependency[];\n mermaid: string;\n};\n\nexport async function analyzeVals(files: SourceMap): Promise;\n```\n\n## Import forms to support first\n\nStatic ES modules:\n\n```ts\nimport x from \"./foo.ts\";\nimport { helper } from \"https://esm.town/v/chad/helper\";\nexport { thing } from \"./thing.ts\";\n```\n\nDynamic imports:\n\n```ts\nconst mod = await import(\"./mod.ts\");\n```\n\nBasic CommonJS, if encountered:\n\n```ts\nconst lodash = require(\"npm:lodash\");\n```\n\n## Dependency classification\n\n- `local` — relative project import like `./foo.ts` or `../lib/bar.ts`\n- `val` — Val Town URL/import like `https://esm.town/v/user/valName`\n- `npm` — `npm:package` or bare npm package imports if Val Town\n allows/normalizes them\n- `jsr` — `jsr:@scope/package`\n- `url` — other `http:`/`https:` imports\n- `builtin` — `node:fs`, `node:path`, etc.\n- `unresolved` — local-looking import that does not match known files\n\n## Likely implementation\n\nUse parser-level extraction instead of regexes.\n\nPotential libraries:\n\n- `npm:acorn`\n- `npm:acorn-walk`\n- `npm:acorn-jsx` if JSX is needed\n- Possibly `npm:@typescript-eslint/typescript-estree` or `npm:oxc-parser` later\n for better TypeScript support\n\nInitial extraction can be small:\n\n1. Parse source as module, falling back to loose/script mode if needed.\n2. Walk AST.\n3. Collect:\n - `ImportDeclaration`\n - `ExportNamedDeclaration.source`\n - `ExportAllDeclaration.source`\n - `ImportExpression` with string literal source\n - `CallExpression` where callee is `require` and first arg is a string\n literal\n4. Resolve/classify each specifier.\n5. Build adjacency list.\n6. Run DFS/Tarjan to find cycles.\n7. Emit Mermaid.\n\n## Resolution rules for MVP\n\nGiven `files: Record`:\n\n- Normalize module ids to POSIX-style paths.\n- For relative imports, resolve from importer directory.\n- Try exact match first.\n- Then try common extensions: `.ts`, `.tsx`, `.js`, `.jsx`, `.mjs`.\n- Then try `/index.ts`, `/index.tsx`, `/index.js`, etc.\n- Non-relative imports are classified as external unless they match a Val Town\n URL.\n\n## Example Mermaid output\n\n```mermaid\ngraph TD\n main_ts[main.http.ts] --> helper_ts[helper.ts]\n main_ts --> npm_lodash[npm:lodash]\n helper_ts --> val_chad_util[esm.town/v/chad/util]\n```\n\n## Later features\n\n- Fetch files from Val Town APIs directly.\n- Analyze one Val, a folder/project, or a user namespace.\n- HTML response with interactive graph.\n- Rule checks:\n - no cycles\n - no unresolved imports\n - no private/external Val imports\n - no npm imports outside allowlist\n - no imports from specific users/namespaces\n- `focus` mode: show only neighbors around one Val/file.\n- Diff mode: compare dependency graph between two versions.\n- Export dependency-cruiser-like JSON for compatibility with other tools.\n\n## Estimated effort\n\n- MVP analyzer: 1–2 days\n- Useful Val Town integration and nicer output: 3–5 days\n- Rule system and richer reporting: 1–2 weeks\n\n## Open questions\n\n- Which Val Town API endpoint should this use to read another Val/project's\n source?\n- Should this analyze only the current user's Vals or public Vals too?\n- Should output be a JSON API, an HTML page, or both?\n- Should the Val store historical graphs for 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