Use TypeScript source for development, swap to build during release

This changes the JS SDK to point `main` to TypeScript source and remove any
indication of `typings`. For local development and CI workflows, it means many
steps can run without building first, which saves lots of time.

During release, we still build for Node and browsers as before. The release
script adjusts the `main` and `typings` fields before publishing and
distribution to point to the built output for those that use them.

package.json

@@ -28,11 +28,12 @@
   "keywords": [
     "matrix-org"
   ],
-  "main": "./lib/index.js",
-  "typings": "./lib/index.d.ts",
+  "main": "./src/index.ts",
   "browser": "./lib/browser-index.js",
   "matrix_src_main": "./src/index.ts",
   "matrix_src_browser": "./src/browser-index.js",
+  "matrix_lib_main": "./lib/index.js",
+  "matrix_lib_typings": "./lib/index.d.ts",
   "author": "matrix.org",
   "license": "Apache-2.0",
   "files": [

release.sh

@@ -6,6 +6,7 @@
 #   github-changelog-generator; install via:
 #     pip install git+https://github.com/matrix-org/github-changelog-generator.git
 #   jq; install from your distribution's package manager (https://stedolan.github.io/jq/)
+#   dot-json; install via Yarn (`yarn global add dot-json`)
 #   hub; install via brew (macOS) or source/pre-compiled binaries (debian) (https://github.com/github/hub) - Tested on v2.2.9
 #   npm; typically installed by Node.js
 #   yarn; install via brew (macOS) or similar (https://yarnpkg.com/docs/install/)
@@ -15,6 +16,7 @@
 set -e
 
 jq --version > /dev/null || (echo "jq is required: please install it"; kill $$)
+dot-json --version > /dev/null || (echo "dot-json is required: please install it"; kill $$)
 if [[ `command -v hub` ]] && [[ `hub --version` =~ hub[[:space:]]version[[:space:]]([0-9]*).([0-9]*) ]]; then
     HUB_VERSION_MAJOR=${BASH_REMATCH[1]}
     HUB_VERSION_MINOR=${BASH_REMATCH[2]}
@@ -178,6 +180,19 @@ echo "yarn version"
 # manually commit the result.
 yarn version --no-git-tag-version --new-version "$release"
 
+# For the published and dist versions of the package, we copy the
+# `matrix_lib_main` and `matrix_lib_typings` fields to `main` and `typings` (if
+# they exist). This small bit of gymnastics allows us to use the TypeScript
+# source directly for development without needing to build before linting or
+# testing.
+for i in main typings
+do
+    lib_value=`dot-json package.json matrix_lib_$i`
+    if [ -n "$lib_value" ]; then
+        dot-json package.json $i $lib_value
+    fi
+done
+
 # commit yarn.lock if it exists, is versioned, and is modified
 if [[ -f yarn.lock && `git status --porcelain yarn.lock | grep '^ M'` ]];
 then
@@ -353,5 +368,30 @@ if [ $(git branch -lr | grep origin/develop -c) -ge 1 ]; then
     git checkout develop
     git pull
     git merge master --no-edit
+
+    # When merging to develop, we need revert the `main` and `typings` fields if
+    # we adjusted them previously.
+    for i in main typings
+    do
+        # If a `lib` prefixed value is present, it means we adjusted the field
+        # earlier at publish time, so we should revert it now.
+        if [ -n "$(dot-json package.json matrix_lib_$i)" ]; then
+            # If there's a `src` prefixed value, use that, otherwise delete.
+            # This is used to delete the `typings` field and reset `main` back
+            # to the TypeScript source.
+            src_value=`dot-json package.json matrix_src_$i`
+            if [ -n "$src_value" ]; then
+                dot-json package.json $i $src_value
+            else
+                dot-json package.json $i --delete
+            fi
+        fi
+    done
+
+    if [ -n "$(git ls-files --modified package.json)" ]; then
+        echo "Committing develop package.json"
+        git commit package.json -m "Resetting package fields for development"
+    fi
+
     git push origin develop
 fi