Use an alternative form to mark oneof fields as required #256

	#
	# Copyright 2023 The Sigstore Authors.
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

	name: Check Typescript build

	permissions:
	contents: read

	on:
	push:
	paths:
	- '**.proto'
	- 'gen/pb-typescript/**'
	pull_request:
	paths:
	- '**.proto'
	- 'gen/pb-typescript/**'

	jobs:
	build:
	strategy:
	matrix:
	node-version:
	- 16.14.0
	- 16.x
	- 18.17.0
	- 18.x
	- 20.5.0
	- 20.x
	fail-fast: false
	runs-on: ubuntu-latest

	defaults:
	run:
	working-directory: gen/pb-typescript

	steps:
	- uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
	- name: Setup node ${{ matrix.node-version }}
	uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
	with:
	node-version: ${{ matrix.node-version }}
	cache: npm
	cache-dependency-path: gen/pb-typescript/package-lock.json
	- name: Build
	run: \|
	npm ci
	npm run build

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