Env var not found: (getter|setter)

[shrujalshah28]

I am trying to decorate env variable with cleanEnv output in Fastify plugin.

const fastifyEnv: FastifyPluginAsync<{ env: Env }> = async (fastify, options) => {
  fastify.decorate('env', options.env);
};

Currently, this throws the following error in strict mode.

ReferenceError: [envalid] Env var not found: getter
        at Object.get ([...]\node_modules\envalid\dist\envalid.cjs.development.js:351:15)
        at decorate ([...]\node_modules\fastify\lib\decorate.js:30:24)
        at Object.decorateFastify [as decorate] ([...]\node_modules\fastify\lib\decorate.js:49:3)
        at fastifyEnv (file:///E:/Projects/shrujal/node-typescript-fastify/src/plugins/envalid.ts:13:11)
        at Plugin.exec ([...]\node_modules\avvio\plugin.js:131:17)
        at Boot.loadPlugin ([...]\node_modules\avvio\plugin.js:266:10)
        at [...]\node_modules\avvio\plugin.js:256:18

and

ReferenceError: [envalid] Env var not found: setter
        at Object.get ([...]\node_modules\envalid\dist\envalid.cjs.development.js:351:15)
        at decorate ([...]\node_modules\fastify\lib\decorate.js:30:59)
        at Object.decorateFastify [as decorate] ([...]\node_modules\fastify\lib\decorate.js:49:3)
        at fastifyEnv (file:///E:/Projects/shrujal/node-typescript-fastify/src/plugins/envalid.ts:13:11)
        at Plugin.exec ([...]\node_modules\avvio\plugin.js:131:17)
        at Boot.loadPlugin ([...]\node_modules\avvio\plugin.js:266:10)
        at [...]\node_modules\avvio\plugin.js:256:18

This is happening due to Fastify decorate try to check getter and setter property on the object.
https://github.com/fastify/fastify/blob/cc5440ba24de119516597356249aa625f58312bc/lib/decorate.js#L28-L36

---

Ref: #74, #76, #103, #104

[af]

This behavior makes sense because of how envalid's strictProxyMiddleware() works. You can work around this by providing your own applyMiddleware() option that doesn't use the proxy middleware.

Alternately, you could insert your own forked version of the proxy middleware (allowing use of getter and setter) into the returned value of applyMiddleware()` if you want the rest of the proxy behavior. Hope that helps!