eslint-plugin-mcdev

eslint-plugin-mcdev

Run your SFMC mcdev metadata validation rules — your project's .mcdev-validations.js plus mcdev's built-in defaults — as ESLint diagnostics. This lets the exact same rules that run during mcdev deploy / mcdev retrieve also run in CI/CD and, through the standard ESLint VS Code extension, live in the editor.

The plugin does not re-implement your rules. It reconstructs mcdev's (definition, item, targetDir, codeExtractItemArr, Util) contract from each metadata file on disk and calls your rules unchanged.

How it works

mcdev validation rules are pure functions over parsed metadata objects, not over source text/AST. ESLint is text/AST-based. The bridge is an ESLint processor that:

• Claims retrieve/**/*-meta.json and deploy/**/*-meta.json files.
• Derives type, bu, cred, targetDir, and key from the file path.
• Loads sibling code files (.html / .amp / .ssjs) into the codeExtractItemArr shape for asset rules.
• Merges your .mcdev-validations.js rules over mcdev's defaults (Object.assign({}, defaultRules, customRules)), reads per-rule severity from .mcdevrc.json, and runs each enabled rule's passed().
• Emits one ESLint message per failing rule at line 1 of the metadata file, using the rule's failedMsg.

Each metadata JSON file is one lint target; each failing validation rule is one ESLint message.

On-disk layout it expects

retrieve/<cred>/<bu>/<type>/<key>.<type>[-<subtype>]-meta.json
retrieve/<cred>/<bu>/asset/block/<key>.asset-block-meta.json  (+ sibling .html/.amp/.ssjs)

• type = folder segment right after the BU.
• bu = segment before the type folder.
• targetDir = path up to and including the BU folder (rules read the last segment via buSuffixMap).

Requirements

• Node.js >=22 (the processor loads .mcdev-validations.js synchronously via Node's synchronous require() of ESM).
• ESLint >=9 (flat config).
• mcdev >=9 installed in the project (used as a peer dependency for its type definitions, default rules, and Util).

Install

npm install --save-dev eslint-plugin-mcdev eslint mcdev

Usage — flat config

Add the recommended preset to your eslint.config.js (or eslint.config.mjs):

import mcdev from 'eslint-plugin-mcdev';

export default [
    // ... your other configs
    ...mcdev.configs.recommended,
];

The preset wires the processor to **/retrieve/**/*-meta.json and **/deploy/**/*-meta.json.

Manual wiring

If you need custom file globs, reference the processor directly:

import mcdev from 'eslint-plugin-mcdev';

export default [
    {
        files: ['**/retrieve/**/*-meta.json'],
        plugins: { mcdev },
        processor: 'mcdev/mcdev',
    },
];

Validation method (strictness)

mcdev applies different severities per method (retrieve, buildDefinition, deploy) in .mcdevrc.json → options.validation.<method> with type-based overrides.

This plugin reads a dedicated eslint method. If options.validation.eslint is not defined, it falls back to deploy (the strictest built-in method, matching what blocks a deploy). This lets you start with zero extra config and later tune ESLint strictness independently from your deploy gate:

{
  "options": {
    "validation": {
      "deploy": {
        "noGuidKeys": "error",
        "keySuffix": "error"
      },
      // optional: overrides just for ESLint; omit this block to reuse "deploy"
      "eslint": {
        "noGuidKeys": "warn",
        "keySuffix": "error"
      }
    }
  }
}

Severities map to ESLint as: error and fix → error, everything else (warn) → warning, off / unset → skipped.

CI / CD

Lint only committed metadata. deploy/ is typically git-ignored, so it will not exist in CI — point ESLint at retrieve/:

# fail the pipeline on any error-severity mcdev validation
npx eslint "retrieve/**/*-meta.json"

error-severity rules exit non-zero; warn-severity rules report but do not fail unless you run ESLint with --max-warnings 0. Use the MCDEV_VALIDATION_METHOD env var to pick the strictness appropriate for the stage.

VS Code

No custom extension is needed — this works through the standard ESLint extension. Because the plugin validates JSON files, tell the extension to lint JSON in your workspace .vscode/settings.json:

{
    "eslint.validate": ["javascript", "json"],
    "eslint.useFlatConfig": true
}

With this in place, opening a *-meta.json file under retrieve/ or deploy/ surfaces mcdev validation failures inline as Problems.

What gets reported

Rule outcome	ESLint result
passed() returns true	nothing
passed() returns false	message with severity from .mcdevrc.json (error or fix → error, otherwise warning)
passed() returns null (filter)	warning: "Item would be filtered out during deploy: …"
rule throws	warning (rule name + error message), never crashes the lint run
severity is off / rule not configured	skipped
invalid JSON	single mcdev/parse-error
unknown metadata type	nothing

Message rule IDs are mcdev/<ruleName> (e.g. mcdev/keySuffix, mcdev/noGuidKeys).

Notes

• Your .mcdev-validations.js does not need any changes — it is consumed as-is with mcdev's real Util passed in.
• Autofix (fix()) is not wired into ESLint --fix yet; this release is read-only validation. Because of that, a rule configured as "fix" in .mcdevrc.json is reported as an error (not silently auto-fixed).

License

MIT © Joern Berkefeld