Migrate tfjs-tflite package to bazel

[jinjingforever]

I mostly followed the migration instructions (very well written! Thanks!). For downloading stuff from google storage, I used genrule that runs the download script. To make it work, I had to change the download script to use "wget" (instead of gsutil) to download the zipped file from google storage and unzip it. (the bucket is public-accessible). The reason is that our "node:10" docker image doesn't have gsutil installed, and the image from google cloud (gcr.io/google.com/cloudsdktool/cloud-sdk) does have gsutil installed, but not nodejs. "node:10" does have "wget" and "unzip" installed.

I also updated the demo of tfjs-tflite to use link-package.

Fixes #5284

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This change is 

[jinjingforever]

I can see that tflite package has been successfully built and tested here

[mattsoulanille]

LGTM with a nit about the package.json jsnext:main field. Thank you!

Reviewed 21 of 22 files at r1, 1 of 1 files at r2.
Reviewable status: complete! 1 of 1 approvals obtained (waiting on @jinjingforever)

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scripts/publish-npm.ts, line 30 at r2 (raw file):

const BAZEL_PACKAGES = new Set(['tfjs-core', 'tfjs-backend-cpu']);

Nit: We can add tflite to this set even though we don't publish it yet since we only check if the set contains the package, we don't iterate the set to publish packages. Alternatively, we can do it once we start publishing tflite. Either is fine.

Same with the e2e test.

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tfjs-backend-cpu/package.json, line 52 at r2 (raw file):

    "bundle": "bazel build :tfjs-backend-cpu_pkg",

Thanks for the fix!

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tfjs-tflite/package.json, line 7 at r2 (raw file):

  "jsnext:main": "dist/index.js"

Nit: I think this should be dist/index.mjs, (and we may want to replace jsnext:main with module) :

jsforum/jsforum#5
https://github.com/rollup/rollup/wiki/pkg.module

[jinjingforever]

Thank you!

Reviewable status: complete! 1 of 1 approvals obtained (waiting on @mattsoulanille)

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scripts/publish-npm.ts, line 30 at r2 (raw file):

Previously, mattsoulanille (Matthew Soulanille) wrote…

const BAZEL_PACKAGES = new Set(['tfjs-core', 'tfjs-backend-cpu']);

Nit: We can add tflite to this set even though we don't publish it yet since we only check if the set contains the package, we don't iterate the set to publish packages. Alternatively, we can do it once we start publishing tflite. Either is fine.

Same with the e2e test.

Done

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tfjs-tflite/package.json, line 7 at r2 (raw file):

Previously, mattsoulanille (Matthew Soulanille) wrote…

  "jsnext:main": "dist/index.js"

Nit: I think this should be dist/index.mjs, (and we may want to replace jsnext:main with module) :

jsforum/jsforum#5
https://github.com/rollup/rollup/wiki/pkg.module

Good to know! Thanks for the links.