Running inside a Deno Docker image?

[anselanza]

I'm trying to get the following setup to work:

• SvelteKit
• Deno
• Docker
• fly.io

So basically, I'm not deploying via Deno Deploy but fly.io instead.

Fly.io needs a "working" Docker image to deploy. I can't quite get it to work on the platform, but in fact I can't quite get it to work "locally" (on my own Docker Desktop instance) either.

What does work so far:

• I have a template originally created with deno run -A npm:sv create my-app (as per https://docs.deno.com/examples/svelte_tutorial/#create-a-sveltekit-app-with-deno)
• I therefore have a package.json file but I'm trying to avoid using npm directly, so I add dependencies using commands like deno add -D npm:sass-embedded which updates package.json and deno.lock
• I have installed svelte-adapter-deno and I have modified svelte.config.js to explicitly use this adapter, i.e. import adapter from 'svelte-adapter-deno';
• I can run deno task dev to serve the dev version (using vite)
• I can build the "production" server using deno task build without any errors
• I can serve the compiled/built application using deno run --allow-env --allow-read --allow-net build/index.js - again, no errors

Now for the Docker part. I have the following Dockerfile, adapted from another Deno fly.io project:

# Based on https://github.com/denoland/deno_docker/blob/main/alpine.dockerfile

ARG DENO_VERSION=1.14.0
ARG BIN_IMAGE=denoland/deno:bin-${DENO_VERSION}
FROM ${BIN_IMAGE} AS bin

FROM frolvlad/alpine-glibc:alpine-3.13

RUN apk --no-cache add ca-certificates

RUN addgroup --gid 1000 deno \
    && adduser --uid 1000 --disabled-password deno --ingroup deno \
    && mkdir /deno-dir/ \
    && chown deno:deno /deno-dir/

ENV DENO_DIR /deno-dir/
ENV DENO_INSTALL_ROOT /usr/local

ARG DENO_VERSION
ENV DENO_VERSION=${DENO_VERSION}
COPY --from=bin /deno /bin/deno

WORKDIR /deno-dir
COPY . .

ENTRYPOINT ["/bin/deno"]
CMD ["run", "--allow-env", "--allow-read", "--allow-net", "build/index.js"]

I can then successfully build the Docker image:

• docker build . --tag sv-deno
• no errors

What does not work:

• docker run sv-deno

The container launches but soon I get a ton of errors such as:

Check file:///deno-dir/build/index.js
error: TS1005 [ERROR]: ',' expected.
  type ErrorStatus,
       ~~~~~~~~~~~
    at https://deno.land/std@0.152.0/http/http_errors.ts:49:8
v11.1.0/mod.ts:93:15

and

TS2531 [ERROR]: Object is possibly 'null'.
      actualTypeStr = actual.constructor?.name ?? "Object";
                      ~~~~~~
    at https://deno.land/std@0.152.0/testing/asserts.ts:359:23

and

TS2300 [ERROR]: Duplicate identifier 'type'.
  type TokensToRegexpOptions,
  ~~~~
    at https://deno.land/x/oak@v11.1.0/deps.ts:63:3

TS2305 [ERROR]: Module '"https://deno.land/std@0.152.0/async/deferred.ts"' has no exported member 'type'.
  type Deferred,
  ~~~~
    at https://deno.land/x/oak@v11.1.0/deps.ts:8:3

...and so on.

These are the errors I see when trying to run the container locally. They are the same errors I see when trying to deploy the app on fly.io as well, which I suppose is to be expected.

Any ideas for how to set up the Dockerfile and/or the adapter and/or Deno itself in order to run my SvelteKit app successfully from Deno+Docker?

[theeasternfurry]

@anselanza Have you considered use adapter-node again in sveltekit? I find it work fine for me, I only have to link deno.json, and update Dockerfile use deno. I stop using adapter-deno back then due to most of projects are now unmaintained and the current adapter-node seem compatible with deno.