Bump express from 4.17.1 to 4.19.2 #88

	name: Benchmarks

	on: [pull_request]

	jobs:
	benchmarks:
	name: benchmarks

	# We can't currently run benchmarks on PRs from forked repos, because the
	# tachometer action reports results by posting a comment, and we can't post
	# comments without a github token.
	if: github.event.pull_request == null \|\| github.event.pull_request.head.repo.full_name == github.repository

	runs-on: ubuntu-latest
	steps:
	- uses: actions/setup-node@v2
	with:
	node-version: 14

	- uses: actions/checkout@v2

	# By default, the actions/checkout@v2 only retrieves the one commit
	# associated with the pull request. The benchmarks test against the
	# `master` branch also, so we explicitly retrieve it here.
	- name: Fetch additional refs
	run: git fetch --no-tags --depth=1 origin master

	- name: Restore benchmarks/node_modules
	id: cache
	uses: actions/cache@v2
	with:
	path: benchmarks/node_modules
	# Bump the number after `lit-element-2.x-benchmarks-node-modules` to
	# force a cache update. Note there are cache actions in other jobs in
	# this file that should all keep keys in sync.
	key: lit-element-2.x-benchmarks-node-modules-0-${{ runner.os }}-${{ hashFiles('benchmarks/package-lock.json') }}

	- name: NPM install
	if: steps.cache.outputs.cache-hit != 'true'
	working-directory: ./benchmarks
	run: npm ci

	- name: Benchmark
	working-directory: ./benchmarks
	run: npx tach --config tachometer.json --json-file results.json

	- name: Report
	uses: andrewiggins/tachometer-reporter-action@v2
	with:
	path: ./benchmarks/results.json
	pr-bench-name: this-change
	base-bench-name: master

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