I started working on Meteor 3.0 and managed to make some progress on the server-side. I started with links and also started adding types and use them in JS files which might help with this migration.

I managed to get the 4 tests in linker.tests.js working and will update progress here as I continue the work.

I'm replacing all calls to their *Async equivalents so I had to bump the minimal Meteor version to 2.8.1.

Tests todos:

• Links
• Exposures
• Queries
• Named queries
• Reactive counts
• GraphQL
• Client tests

3rd party deps:

• peerlibrary:subscription-scope not working (it should be an easy fix)
• herteby:denormalize is not working with Meteor 3.0
• Client tests affected by TypeError: this.observeHandle.stop is not a function Meteor-Community-Packages/meteor-publish-composite#175

Other:

• Update types
• Setup lint
• API changes docs

Compatibility with Meteor v2

• getLink, add, set, etc functions in links should get Async suffix, client should stay the same

How to test

# v3
meteor create --release 3.0-beta.0 --bare test
cd test 
meteor npm i --save selenium-webdriver@3.6.0 chromedriver@2.36.0 simpl-schema@1.13.1 chai

# then we also need to add packages that are not published yet
mkdir packages
cd packages

# mongo-collection-instances
git clone -b migration/3.0 https://github.com/Meteor-Community-Packages/mongo-collection-instances.git

# meteortesting:mocha
git clone -b migrate/3.0 https://github.com/Meteor-Community-Packages/meteor-mocha.git meteor-mocha-repo
# copy package into packages
cp -R ./meteor-mocha-repo/package ./meteor-mocha

Package.json in test (see scripts for convenience methods)

{
  "name": "test",
  "private": true,
  "scripts": {
    "start": "meteor run",
    "test": "MONGO_URL= METEOR_PACKAGE_DIRS=\"../:packages\" TEST_BROWSER_DRIVER=chrome meteor test-packages --driver-package meteortesting:mocha --once  --port 3010 ../",
    "test:server": "TEST_CLIENT=0 MONGO_URL= METEOR_PACKAGE_DIRS=\"../:packages\" TEST_BROWSER_DRIVER=chrome meteor test-packages --driver-package meteortesting:mocha --once  --port 3010 ../",
    "test:server:watch": "TEST_CLIENT=0 MONGO_URL= METEOR_PACKAGE_DIRS=\"../:packages\" TEST_BROWSER_DRIVER=chrome meteor test-packages --driver-package meteortesting:mocha  --port 3010 ../"
  },
  "dependencies": {
    "@babel/runtime": "^7.23.5",
    "chai": "^5.1.0",
    "chromedriver": "^2.36.0",
    "meteor-node-stubs": "^1.2.7",
    "selenium-webdriver": "^3.6.0",
    "simpl-schema": "^1.13.1"
  }
}