Switch type check to GitHub Actions

and add (working) type check for release mode js-sdk types

.github/workflows/lint.yaml

@@ -0,0 +1,25 @@
+name: Lint
+on:
+    pull_request:
+        branches: [develop]
+jobs:
+    build:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2
+            - uses: c-hive/gha-yarn-cache@v2
+            - name: Install Deps
+              run: "./scripts/ci/install-deps.sh --ignore-scripts"
+            - name: Typecheck
+              run: "yarn run lint:types"
+            - name: Switch js-sdk to release mode
+              run: |
+                  scripts/ci/js-sdk-to-release.js
+                  pushd node_modules/matrix-js-sdk
+                  yarn install
+                  yarn run build:compile
+                  yarn run build:types
+                  popd
+            - name: Typecheck (release mode)
+              run: "yarn run lint:types"
+

scripts/ci/js-sdk-to-release.js

@@ -0,0 +1,17 @@
+#!/usr/bin/env node
+
+const fsProm = require('fs/promises');
+
+const PKGJSON = 'node_modules/matrix-js-sdk/package.json';
+
+async function main() {
+    const pkgJson = JSON.parse(await fsProm.readFile(PKGJSON, 'utf8'));
+    for (const field of ['main', 'typings']) {
+        if (pkgJson["matrix_lib_"+field] !== undefined) {
+            pkgJson[field] = pkgJson["matrix_lib_"+field];
+        }
+    }
+    await fsProm.writeFile(PKGJSON, JSON.stringify(pkgJson, null, 2));
+}
+
+main();

scripts/ci/js-sdk-to-release.sh

@@ -1,21 +0,0 @@
-#!/bin/sh
-
-# This changes the js-sdk into 'release mode', that is:
-# * The entry point for the library is the babel-compiled lib/index.js rather than src/index.ts
-# * There's a 'typings' entry referencing the types output by tsc
-# We do this so we can test that each PR still builds / type checks correctly when built
-# against the released js-sdk, because if you do things like `import { User } from 'matrix-js-sdk';`
-# rather than `import { User } from 'matrix-js-sdk/src/models/user';` it will work fine with the
-# js-sdk in development mode but then break at release time.
-# We can't use the last release of the js-sdk though: it might not be up to date enough.
-
-cd node_modules/matrix-js-sdk
-for i in main typings
-do
-    lib_value=$(jq -r ".matrix_lib_$i" package.json)
-    if [ "$lib_value" != "null" ]; then
-        jq ".$i = .matrix_lib_$i" package.json > package.json.new && mv package.json.new package.json
-    fi
-done
-yarn run build:compile
-yarn run build:types