diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index edf2f839ee6cc8cb5f77791a76f77969d8a7df75..cd6af4f1ff63da40d06395d80e9a7970edad256f 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -31,25 +31,18 @@ CI will ensure your code is formatted, lints and passes tests.
 It will collect coverage and report it to [codecov](https://codecov.io/gh/nhooyr/websocket)
 and also upload a html `coverage` artifact that you can download to browse coverage.
 
-You can run CI locally. You only need [Go](https://golang.org), [nodejs](https://nodejs.org/en/) and [yarn](https://yarnpkg.com).
+You can run CI locally.
 
-See the scripts in [package.json](../package.json).
-
-1. `yarn fmt` performs code generation and formatting.
-1. `yarn lint` performs linting.
-1. `yarn test` runs tests.
-1. `yarn all` runs the above scripts in parallel.
+See [ci/image/Dockerfile](../ci/image/Dockerfile) for the installation of the CI dependencies on Ubuntu.
 
-For coverage details locally, see `ci/out/coverage.html` after running `yarn test`.
+1. `make fmt` performs code generation and formatting.
+1. `make lint` performs linting.
+1. `make test` runs tests.
+1. `make` runs the above targets.
 
-CI is written with nodejs to enable running as much as possible concurrently.
+For coverage details locally, see `ci/out/coverage.html` after running `make test`.
 
-See [ci/image/Dockerfile](../ci/image/Dockerfile) for the installation of the CI dependencies on Ubuntu.
-
-You can also run tests normally with `go test`. `yarn test` just passes a default set of flags to
+You can also run tests normally with `go test`. `make test` just passes a default set of flags to
 `go test` to collect coverage and runs the WASM tests.
 
-You can pass flags to `yarn test` if you want to run a specific test or otherwise
-control the behaviour of `go test` but also get coverage.
-
 Coverage percentage from codecov and the CI scripts will be different because they are calculated differently.
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ac3770fc5321769f7ae03a27ade867f7481ac683..0f896ef2b142df47ebbb84594e484ee68fa28eb1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -4,22 +4,22 @@ on: [push]
 jobs:
   fmt:
     runs-on: ubuntu-latest
-    container: nhooyr/websocket-ci@sha256:13f9b8cc2f901e98c253595c4070254ece08543f6e100b4fa6682f87de4388eb
+    container: nhooyr/websocket-ci@sha256:54a12b52be98d2d1588a054cfce35d17705c9b45546478d8bcdbac2a89a90001
     steps:
       - uses: actions/checkout@v1
-      - run: yarn --frozen-lockfile && yarn fmt
+      - run: make fmt
   lint:
     runs-on: ubuntu-latest
-    container: nhooyr/websocket-ci@sha256:13f9b8cc2f901e98c253595c4070254ece08543f6e100b4fa6682f87de4388eb
+    container: nhooyr/websocket-ci@sha256:54a12b52be98d2d1588a054cfce35d17705c9b45546478d8bcdbac2a89a90001
     steps:
       - uses: actions/checkout@v1
-      - run: yarn --frozen-lockfile && yarn lint
+      - run: make lint
   test:
     runs-on: ubuntu-latest
-    container: nhooyr/websocket-ci@sha256:13f9b8cc2f901e98c253595c4070254ece08543f6e100b4fa6682f87de4388eb
+    container: nhooyr/websocket-ci@sha256:54a12b52be98d2d1588a054cfce35d17705c9b45546478d8bcdbac2a89a90001
     steps:
       - uses: actions/checkout@v1
-      - run: yarn --frozen-lockfile && yarn test
+      - run: make test
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
       - name: Upload coverage.html
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..ce92ab5ba82b546c53e7aa13d91296cd11d50bcc
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,13 @@
+all: fmt lint test
+
+.SILENT:
+
+.PHONY: *
+
+include ci/fmt.mk
+include ci/lint.mk
+include ci/test.mk
+
+ci-image:
+	docker build -f ./ci/image/Dockerfile -t nhooyr/websocket-ci .
+	docker push nhooyr/websocket-ci
diff --git a/ci/.eslintrc.yaml b/ci/.eslintrc.yaml
deleted file mode 100644
index c6d53e23ef0b57cc170c94b05b97310a40517b8e..0000000000000000000000000000000000000000
--- a/ci/.eslintrc.yaml
+++ /dev/null
@@ -1,23 +0,0 @@
-parser: "@typescript-eslint/parser"
-env:
-  node: true
-
-parserOptions:
-  ecmaVersion: 2018
-  sourceType: module
-
-extends:
-  # https://github.com/typescript-eslint/typescript-eslint/tree/master/packages/eslint-plugin#usage
-  - eslint:recommended
-  - plugin:@typescript-eslint/eslint-recommended
-  - plugin:@typescript-eslint/recommended
-  # https://www.npmjs.com/package/eslint-plugin-import#typescript
-  - plugin:import/recommended
-  - plugin:import/typescript
-  #  https://dev.to/robertcoopercode/using-eslint-and-prettier-in-a-typescript-project-53jb
-  - prettier/@typescript-eslint
-
-rules:
-  "@typescript-eslint/no-use-before-define": off
-  "@typescript-eslint/explicit-function-return-type": off
-  "@typescript-eslint/no-non-null-assertion": off
diff --git a/ci/all.ts b/ci/all.ts
deleted file mode 100755
index c0d16a8b7b621629b1952660fa5b708c0498d553..0000000000000000000000000000000000000000
--- a/ci/all.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-#!/usr/bin/env -S npx ts-node -P ci/tsconfig.json
-
-import { fmt, gen } from "./fmt"
-import { main } from "./lib"
-import { lint } from "./lint"
-import { test } from "./test"
-
-main(run)
-
-async function run(ctx: Promise<unknown>) {
-  await gen(ctx)
-
-  await Promise.all([fmt(ctx), lint(ctx), test(ctx)])
-}
diff --git a/ci/fmt.mk b/ci/fmt.mk
new file mode 100644
index 0000000000000000000000000000000000000000..631a894d8c81d45c24cffa88e1e92b8570f716d5
--- /dev/null
+++ b/ci/fmt.mk
@@ -0,0 +1,22 @@
+fmt: modtidy gofmt goimports prettier
+ifdef CI
+	./ci/fmtcheck.sh
+endif
+
+modtidy: gen
+	go mod tidy
+
+gofmt: gen
+	gofmt -w -s .
+
+goimports: gen
+	goimports -w "-local=$$(go list -m)" .
+
+prettier: gen
+	prettier --write --print-width=120 --no-semi --trailing-comma=all --loglevel=warn $$(git ls-files "*.yaml" "*.yml" "*.md" "*.ts")
+
+shfmt: gen
+	shfmt -i 2 -w -s -sr .
+
+gen:
+	go generate ./...
diff --git a/ci/fmt.ts b/ci/fmt.ts
deleted file mode 100755
index 6d7543ed7da7713e68cc8ad80fd86bf602482a08..0000000000000000000000000000000000000000
--- a/ci/fmt.ts
+++ /dev/null
@@ -1,39 +0,0 @@
-#!/usr/bin/env -S npx ts-node -P ci/tsconfig.json
-
-import { exec, main } from "./lib"
-
-if (require.main === module) {
-  main(async (ctx: Promise<unknown>) => {
-    await gen(ctx)
-    await fmt(ctx)
-  })
-}
-
-export async function fmt(ctx: Promise<unknown>) {
-  await Promise.all([
-    exec(ctx, "go mod tidy"),
-    exec(ctx, "gofmt -w -s ."),
-    exec(ctx, `go run go.coder.com/go-tools/cmd/goimports -w "-local=$(go list -m)" .`),
-    exec(
-      ctx,
-      `npx prettier --write --print-width=120 --no-semi --trailing-comma=all --loglevel=silent $(git ls-files "*.yaml" "*.yml" "*.md" "*.ts")`,
-    ),
-  ])
-
-  if (process.env.CI) {
-    const r = await exec(ctx, "git ls-files --other --modified --exclude-standard")
-    const files = r.stdout.toString().trim()
-    if (files.length) {
-      console.log(`files need generation or are formatted incorrectly:
-${files}
-
-please run:
-  ./ci/fmt.js`)
-      process.exit(1)
-    }
-  }
-}
-
-export async function gen(ctx: Promise<unknown>) {
-  await exec(ctx, "go generate ./...")
-}
diff --git a/ci/fmtcheck.sh b/ci/fmtcheck.sh
new file mode 100755
index 0000000000000000000000000000000000000000..6e452a382da25ffedb6dc012214d37baa8614371
--- /dev/null
+++ b/ci/fmtcheck.sh
@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+if [[ $(git ls-files --other --modified --exclude-standard) != "" ]]; then
+  echo "Files need generation or are formatted incorrectly."
+  git status
+  echo "Please run the following locally:"
+  echo "  make fmt"
+  exit 1
+fi
diff --git a/ci/image/Dockerfile b/ci/image/Dockerfile
index 44c058d110530a9d7a2ad370a66f12355dafc83e..51fdb69b15ca7713f31dc7f1ab488374280e4786 100644
--- a/ci/image/Dockerfile
+++ b/ci/image/Dockerfile
@@ -1,24 +1,34 @@
 FROM golang:1
 
-RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && \
-  echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
-
-RUN curl -sL https://deb.nodesource.com/setup_12.x | bash -
-RUN apt-get install -y nodejs chromium yarn
-
-COPY ./ci/image/gitignore /etc/git/ignore
-RUN git config --system color.ui always
-# Need to set set this explicitly for the system since github uses HOME=/home/github.
-RUN git config --system core.excludesfile /etc/git/ignore
+RUN apt-get update
+RUN apt-get install -y chromium
+RUN apt-get install -y npm
+RUN apt-get install -y shellcheck
 
 ENV GOPATH=/root/gopath
 ENV PATH=$GOPATH/bin:$PATH
 ENV GOFLAGS="-mod=readonly"
 ENV PAGER=cat
 ENV CI=true
+ENV MAKEFLAGS="-j --output-sync target"
 
-# Cache go modules, build cache and yarn cache.
+COPY ./ci/image/gitignore /root/.config/git/ignore
+RUN git config --system color.ui always
+
+RUN npm install -g prettier
+RUN go get golang.org/x/tools/cmd/stringer
+RUN go get golang.org/x/tools/cmd/goimports
+RUN go get mvdan.cc/sh/cmd/shfmt
+RUN go get golang.org/x/lint/golint
+RUN go get github.com/agnivade/wasmbrowsertest
+
+# Cache go modules and build cache.
 COPY . /tmp/websocket
 RUN cd /tmp/websocket && \
-  yarn && CI= yarn ci && \
+  CI= make && \
   rm -rf /tmp/websocket
+
+# GitHub actions tries to override HOME to /github/home and then
+# mounts a temp directory into there. We do not want this behaviour.
+# I assume it is so that $HOME is preserved between steps in a job.
+ENTRYPOINT ["env", "HOME=/root"]
diff --git a/ci/image/dockerignore b/ci/image/dockerignore
deleted file mode 100644
index 3c3629e647f5ddf82548912e337bea9826b434af..0000000000000000000000000000000000000000
--- a/ci/image/dockerignore
+++ /dev/null
@@ -1 +0,0 @@
-node_modules
diff --git a/ci/image/push.ts b/ci/image/push.ts
deleted file mode 100755
index ee2a50dccac6c0eabe262334ff834c8169614a7a..0000000000000000000000000000000000000000
--- a/ci/image/push.ts
+++ /dev/null
@@ -1,24 +0,0 @@
-#!/usr/bin/env -S npx ts-node -P ci/tsconfig.json
-
-import fs from "fs"
-import { promisify } from "util"
-import { main, spawn } from "../lib"
-
-main(run, {
-  timeout: 10 * 60_000,
-})
-
-async function run(ctx: Promise<unknown>) {
-  await promisify(fs.copyFile)("./ci/image/dockerignore", ".dockerignore")
-
-  try {
-    await spawn(ctx, "docker build -f ./ci/image/Dockerfile -t nhooyr/websocket-ci .", [], {
-      stdio: "inherit",
-    })
-    await spawn(ctx, "docker push nhooyr/websocket-ci", [], {
-      stdio: "inherit",
-    })
-  } finally {
-    await promisify(fs.unlink)(".dockerignore")
-  }
-}
diff --git a/ci/lib.ts b/ci/lib.ts
deleted file mode 100644
index b6e5d0b4a05b0fb923761445a51458669aa2db7c..0000000000000000000000000000000000000000
--- a/ci/lib.ts
+++ /dev/null
@@ -1,123 +0,0 @@
-import Timeout from "await-timeout"
-import cp from "child-process-promise"
-import { ExecOptions, SpawnOptions } from "child_process"
-
-export async function main(
-  fn: (ctx: Promise<unknown>) => void,
-  opts: {
-    timeout: number
-  } = {
-    timeout: 3 * 60_000,
-  },
-) {
-  const timer = new Timeout()
-  let ctx: Promise<unknown> = timer.set(opts.timeout, "context timed out")
-
-  const interrupted = new Promise((res, rej) => {
-    let int = 0
-    process.on("SIGINT", () => {
-      int++
-      if (int === 2) {
-        console.log("force exited")
-        process.exit(1)
-      }
-      rej("")
-    })
-  })
-
-  ctx = Promise.race([ctx, interrupted])
-  const { res, rej, p } = withCancel(ctx)
-  ctx = p
-
-  try {
-    await init(ctx)
-    await fn(ctx)
-    res!()
-  } catch (e) {
-    console.log(e)
-    rej!()
-    process.on("beforeExit", () => {
-      process.exit(1)
-    })
-  } finally {
-    timer.clear()
-  }
-}
-
-// TODO promisify native versions
-export async function exec(ctx: Promise<unknown>, cmd: string, opts?: ExecOptions) {
-  opts = {
-    ...opts,
-  }
-  const p = cp.exec(cmd, opts)
-
-  try {
-    return await selectCtx(ctx, p)
-  } finally {
-    p.childProcess.kill()
-  }
-}
-
-export async function spawn(ctx: Promise<unknown>, cmd: string, args: string[], opts?: SpawnOptions) {
-  if (args === undefined) {
-    args = []
-  }
-  opts = {
-    shell: true,
-    ...opts,
-  }
-  const p = cp.spawn(cmd, args, opts)
-
-  try {
-    return await selectCtx(ctx, p)
-  } finally {
-    p.childProcess.kill()
-  }
-}
-
-async function init(ctx: Promise<unknown>) {
-  const r = await exec(ctx, "git rev-parse --show-toplevel", {
-    cwd: __dirname,
-  })
-
-  process.chdir(r.stdout.toString().trim())
-}
-
-export async function selectCtx<T>(ctx: Promise<unknown>, p: Promise<T>): Promise<T> {
-  return (await Promise.race([ctx, p])) as Promise<T>
-}
-
-const cancelSymbol = Symbol()
-
-export function withCancel<T>(p: Promise<T>) {
-  let rej: () => void
-  let res: () => void
-  const p2 = new Promise<T>((res2, rej2) => {
-    res = res2
-    rej = () => {
-      rej2(cancelSymbol)
-    }
-  })
-
-  p = Promise.race<T>([p, p2])
-  p = p.catch(e => {
-    // We need this catch to prevent node from complaining about it being unhandled.
-    // Look into why more later.
-    if (e === cancelSymbol) {
-      return
-    }
-    throw e
-  }) as Promise<T>
-
-  return {
-    res: res!,
-    rej: rej!,
-    p: p,
-  }
-}
-
-export const wasmEnv = {
-  ...process.env,
-  GOOS: "js",
-  GOARCH: "wasm",
-}
diff --git a/ci/lint.mk b/ci/lint.mk
new file mode 100644
index 0000000000000000000000000000000000000000..f68add4176bb4ec5db3ff4174dd1c00bae44c83d
--- /dev/null
+++ b/ci/lint.mk
@@ -0,0 +1,16 @@
+lint: govet golint govet-wasm golint-wasm shellcheck
+
+govet:
+	go vet ./...
+
+govet-wasm:
+	GOOS=js GOARCH=wasm go vet ./...
+
+golint:
+	golint -set_exit_status ./...
+
+golint-wasm:
+	GOOS=js GOARCH=wasm golint -set_exit_status ./...
+
+shellcheck:
+	shellcheck -x $$(git ls-files "*.sh")
diff --git a/ci/lint.ts b/ci/lint.ts
deleted file mode 100755
index 22a47df3b1d9c10fbb7a1a62343ddde0c22a5f12..0000000000000000000000000000000000000000
--- a/ci/lint.ts
+++ /dev/null
@@ -1,25 +0,0 @@
-#!/usr/bin/env -S npx ts-node -P ci/tsconfig.json
-
-import { exec, main, wasmEnv } from "./lib"
-
-if (require.main === module) {
-  main(lint)
-}
-
-export async function lint(ctx: Promise<unknown>) {
-  await Promise.all([
-    exec(ctx, "go vet ./..."),
-    exec(ctx, "go run golang.org/x/lint/golint -set_exit_status ./..."),
-    exec(ctx, "git ls-files '*.ts' | xargs npx eslint --max-warnings 0 --fix", {
-      cwd: "ci",
-    }),
-    wasmLint(ctx),
-  ])
-}
-
-async function wasmLint(ctx: Promise<unknown>) {
-  await exec(ctx, "go install golang.org/x/lint/golint")
-  await exec(ctx, "golint -set_exit_status ./...", {
-    env: wasmEnv,
-  })
-}
diff --git a/ci/test.mk b/ci/test.mk
new file mode 100644
index 0000000000000000000000000000000000000000..2d72eadd3362915774e1c8cb7734512429d8c713
--- /dev/null
+++ b/ci/test.mk
@@ -0,0 +1,24 @@
+test: gotest gotest-wasm
+
+gotest: _gotest htmlcov
+ifdef CI
+gotest: codecov
+endif
+
+htmlcov: _gotest
+	go tool cover -html=ci/out/coverage.prof -o=ci/out/coverage.html
+
+codecov: _gotest
+	curl -s https://codecov.io/bash | bash -s -- -Z -f ci/out/coverage.prof
+
+_gotest:
+	echo "--- gotest" && go test -parallel=32 -coverprofile=ci/out/coverage.prof -coverpkg=./... ./...
+	sed -i '/_stringer.go/d' ci/out/coverage.prof
+	sed -i '/wsjstest/d' ci/out/coverage.prof
+	sed -i '/wsecho/d' ci/out/coverage.prof
+
+gotest-wasm: wsjstest
+	echo "--- wsjstest" && ./ci/wasmtest.sh
+
+wsjstest:
+	go install ./internal/wsjstest
diff --git a/ci/test.ts b/ci/test.ts
deleted file mode 100755
index b44ae34b1b3cc3f0f2d6d8ccbf0c382d873a79c6..0000000000000000000000000000000000000000
--- a/ci/test.ts
+++ /dev/null
@@ -1,88 +0,0 @@
-#!/usr/bin/env -S npx ts-node -P ci/tsconfig.json
-
-import cp from "child_process"
-import * as events from "events"
-import * as readline from "readline"
-import replaceInFile from "replace-in-file"
-import { exec, main, selectCtx, spawn, wasmEnv } from "./lib"
-
-if (require.main === module) {
-  main(test)
-}
-
-export async function test(ctx: Promise<unknown>) {
-  const args = ["-parallel=32", "-coverprofile=ci/out/coverage.prof", "-coverpkg=./..."]
-
-  if (process.env.CI) {
-    args.push("-race")
-  }
-
-  const cliArgs = process.argv.splice(2)
-  if (cliArgs.length > 0) {
-    args.push(...cliArgs)
-  } else {
-    args.push("./...")
-  }
-
-  const p1 = spawn(ctx, "go", ["test", ...args], {
-    stdio: "inherit",
-  })
-  const p2 = wasmTest(ctx)
-  await Promise.all([p1, p2])
-
-  // Depending on the code tested, we may not have replaced anything so we do not
-  // check whether anything was replaced.
-  await selectCtx(
-    ctx,
-    replaceInFile({
-      files: "./ci/out/coverage.prof",
-      from: [/.+frame_stringer.go.+\n/g, /.+wsjstest\/.+\n/g, /.+wsecho\/.+\n/g, /.+assert\/.+\n/g],
-      to: "",
-    }),
-  )
-
-  let p: Promise<unknown> = exec(ctx, "go tool cover -html=ci/out/coverage.prof -o=ci/out/coverage.html")
-
-  if (process.env.CI) {
-    p = Promise.all([p, codecov(ctx)])
-  }
-
-  await p
-}
-
-async function wasmTest(ctx: Promise<unknown>) {
-  await Promise.all([
-    exec(ctx, "go install ./internal/wsjstest"),
-    exec(ctx, "go install github.com/agnivade/wasmbrowsertest"),
-  ])
-
-  const url = await startWasmTestServer(ctx)
-
-  await exec(ctx, "go test -exec=wasmbrowsertest ./...", {
-    env: {
-      ...wasmEnv,
-      WS_ECHO_SERVER_URL: url,
-    },
-  })
-}
-
-async function startWasmTestServer(ctx: Promise<unknown>): Promise<string> {
-  const wsjstest = cp.spawn("wsjstest")
-  ctx.finally(wsjstest.kill.bind(wsjstest))
-
-  const rl = readline.createInterface({
-    input: wsjstest.stdout!,
-  })
-
-  try {
-    const p = events.once(rl, "line")
-    const a = await selectCtx(ctx, p)
-    return a[0]
-  } finally {
-    rl.close()
-  }
-}
-
-function codecov(ctx: Promise<unknown>) {
-  return exec(ctx, "curl -s https://codecov.io/bash | bash -s -- -Z -f ci/out/coverage.prof")
-}
diff --git a/ci/tools.go b/ci/tools.go
deleted file mode 100644
index 4cbd71cfedf902a784a7c961c6f9b58a4e828dd7..0000000000000000000000000000000000000000
--- a/ci/tools.go
+++ /dev/null
@@ -1,11 +0,0 @@
-// +build tools
-
-package ci
-
-// See https://github.com/go-modules-by-example/index/blob/master/010_tools/README.md
-import (
-	_ "github.com/agnivade/wasmbrowsertest"
-	_ "go.coder.com/go-tools/cmd/goimports"
-	_ "golang.org/x/lint/golint"
-	_ "golang.org/x/tools/cmd/stringer"
-)
diff --git a/ci/tsconfig.json b/ci/tsconfig.json
deleted file mode 100644
index cdf51985c48f028be8f3f86f1ebf10ef02d8477c..0000000000000000000000000000000000000000
--- a/ci/tsconfig.json
+++ /dev/null
@@ -1,62 +0,0 @@
-{
-  "compilerOptions": {
-    /* Basic Options */
-    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
-    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
-    // "lib": [],                             /* Specify library files to be included in the compilation. */
-    // "allowJs": true,                       /* Allow javascript files to be compiled. */
-    // "checkJs": true,                       /* Report errors in .js files. */
-    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
-    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
-    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
-    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
-    // "outFile": "./",                       /* Concatenate and emit output to single file. */
-    // "outDir": "./",                        /* Redirect output structure to the directory. */
-     "rootDir": "./ci",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
-    // "composite": true,                     /* Enable project compilation */
-    // "incremental": true,                   /* Enable incremental compilation */
-    // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
-    // "removeComments": true,                /* Do not emit comments to output. */
-     "noEmit": true,                        /* Do not emit outputs. */
-    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
-    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
-    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
-
-    /* Strict Type-Checking Options */
-    "strict": true,                           /* Enable all strict type-checking options. */
-    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
-    // "strictNullChecks": true,              /* Enable strict null checks. */
-    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
-    // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
-    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
-    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
-    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
-
-    /* Additional Checks */
-    // "noUnusedLocals": true,                /* Report errors on unused locals. */
-    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
-    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
-    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
-
-    /* Module Resolution Options */
-    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
-    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
-    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
-    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
-    // "typeRoots": [],                       /* List of folders to include type definitions from. */
-    // "types": [],                           /* Type declaration files to be included in compilation. */
-    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
-    "esModuleInterop": true                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
-    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
-
-    /* Source Map Options */
-    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
-    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
-    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
-    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
-
-    /* Experimental Options */
-    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
-    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
-  }
-}
diff --git a/ci/wasmtest.sh b/ci/wasmtest.sh
new file mode 100755
index 0000000000000000000000000000000000000000..21335ce7c1904d6a150e92b078da0a8c1270d907
--- /dev/null
+++ b/ci/wasmtest.sh
@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+WS_ECHO_SERVER_URL="$(wsjstest)"
+trap 'pkill -KILL wsjstest' EXIT INT
+export WS_ECHO_SERVER_URL
+
+GOOS=js GOARCH=wasm go test -exec=wasmbrowsertest ./...
diff --git a/frame.go b/frame.go
index b5301d782d4e61f74dfae302c0315c8ddaafba98..be23330e532c0cc9fede81521b266a7c49868a49 100644
--- a/frame.go
+++ b/frame.go
@@ -8,7 +8,7 @@ import (
 	"math"
 )
 
-//go:generate go run golang.org/x/tools/cmd/stringer -type=opcode,MessageType,StatusCode -output=frame_stringer.go
+//go:generate stringer -type=opcode,MessageType,StatusCode -output=frame_stringer.go
 
 // opcode represents a WebSocket Opcode.
 type opcode int
diff --git a/go.mod b/go.mod
index 0e3983667560548c38ee1ecfb1a1d3e2c798b07a..e733429b724e5c3a7587bb13f822bfabe6635f2f 100644
--- a/go.mod
+++ b/go.mod
@@ -3,23 +3,13 @@ module nhooyr.io/websocket
 go 1.13
 
 require (
-	github.com/agnivade/wasmbrowsertest v0.3.1
-	github.com/chromedp/cdproto v0.0.0-20190926234355-1b4886c6fad6 // indirect
-	github.com/chromedp/chromedp v0.4.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/go-interpreter/wagon v0.6.0 // indirect
 	github.com/golang/protobuf v1.3.2
 	github.com/google/go-cmp v0.3.1
-	github.com/google/pprof v0.0.0-20190908185732-236ed259b199 // indirect
 	github.com/kr/pretty v0.1.0 // indirect
-	github.com/mailru/easyjson v0.7.0 // indirect
 	github.com/stretchr/testify v1.4.0 // indirect
-	go.coder.com/go-tools v0.0.0-20190317003359-0c6a35b74a16
 	go.uber.org/atomic v1.4.0 // indirect
 	go.uber.org/multierr v1.1.0
-	golang.org/x/lint v0.0.0-20190909230951-414d861bb4ac
-	golang.org/x/sys v0.0.0-20190927073244-c990c680b611 // indirect
 	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4
-	golang.org/x/tools v0.0.0-20190920225731-5eefd052ad72
 	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
 )
diff --git a/go.sum b/go.sum
index afd13b7414487716752d62dcfdbdb4f9200ced11..954b79f5efc5cbe4274272e47ac2461e9284559f 100644
--- a/go.sum
+++ b/go.sum
@@ -1,92 +1,27 @@
-github.com/agnivade/wasmbrowsertest v0.3.1 h1:bA9aA+bcp7KuqGvmCuBdnMqy6PXxFjYP7FxsaT+JSqc=
-github.com/agnivade/wasmbrowsertest v0.3.1/go.mod h1:zQt6ZTdl338xxRaMW395qccVE2eQm0SjC/SDz0mPWQI=
-github.com/chromedp/cdproto v0.0.0-20190614062957-d6d2f92b486d/go.mod h1:S8mB5wY3vV+vRIzf39xDXsw3XKYewW9X6rW2aEmkrSw=
-github.com/chromedp/cdproto v0.0.0-20190621002710-8cbd498dd7a0 h1:4Wocv9f+KWF4GtZudyrn8JSBTgHQbGp86mcsoH7j1iQ=
-github.com/chromedp/cdproto v0.0.0-20190621002710-8cbd498dd7a0/go.mod h1:S8mB5wY3vV+vRIzf39xDXsw3XKYewW9X6rW2aEmkrSw=
-github.com/chromedp/cdproto v0.0.0-20190812224334-39ef923dcb8d/go.mod h1:0YChpVzuLJC5CPr+x3xkHN6Z8KOSXjNbL7qV8Wc4GW0=
-github.com/chromedp/cdproto v0.0.0-20190926234355-1b4886c6fad6 h1:C/dvU7FH/BUbkgKS/eYDrja/D5idxH+FxaVmFRWW3E8=
-github.com/chromedp/cdproto v0.0.0-20190926234355-1b4886c6fad6/go.mod h1:0YChpVzuLJC5CPr+x3xkHN6Z8KOSXjNbL7qV8Wc4GW0=
-github.com/chromedp/chromedp v0.3.1-0.20190619195644-fd957a4d2901 h1:tg66ykM8VYqP9k4DFQwSMnYv84HNTruF+GR6kefFNg4=
-github.com/chromedp/chromedp v0.3.1-0.20190619195644-fd957a4d2901/go.mod h1:mJdvfrVn594N9tfiPecUidF6W5jPRKHymqHfzbobPsM=
-github.com/chromedp/chromedp v0.4.0 h1:0AJC5ejETuh/6n7Tcsw4u4G0eKZkI9aVRwckWaImLUE=
-github.com/chromedp/chromedp v0.4.0/go.mod h1:DC3QUn4mJ24dwjcaGQLoZrhm4X/uPHZ6spDbS2uFhm4=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/edsrzf/mmap-go v1.0.0 h1:CEBF7HpRnUCSJgGUb5h1Gm7e3VkmVDrR8lvWVLtrOFw=
-github.com/edsrzf/mmap-go v1.0.0/go.mod h1:YO35OhQPt3KJa3ryjFM5Bs14WD66h8eGKpfaBNrHW5M=
-github.com/go-interpreter/wagon v0.5.1-0.20190713202023-55a163980b6c h1:DLLAPVFrk9iNzljMKF512CUmrFImQ6WU3sDiUS4IRqk=
-github.com/go-interpreter/wagon v0.5.1-0.20190713202023-55a163980b6c/go.mod h1:5+b/MBYkclRZngKF5s6qrgWxSLgE9F5dFdO1hAueZLc=
-github.com/go-interpreter/wagon v0.6.0 h1:BBxDxjiJiHgw9EdkYXAWs8NHhwnazZ5P2EWBW5hFNWw=
-github.com/go-interpreter/wagon v0.6.0/go.mod h1:5+b/MBYkclRZngKF5s6qrgWxSLgE9F5dFdO1hAueZLc=
-github.com/gobwas/httphead v0.0.0-20180130184737-2c6c146eadee h1:s+21KNqlpePfkah2I+gwHF8xmJWRjooY+5248k6m4A0=
-github.com/gobwas/httphead v0.0.0-20180130184737-2c6c146eadee/go.mod h1:L0fX3K22YWvt/FAX9NnzrNzcI4wNYi9Yku4O0LKYflo=
-github.com/gobwas/pool v0.2.0 h1:QEmUOlnSjWtnpRGHF3SauEiOsy82Cup83Vf2LcMlnc8=
-github.com/gobwas/pool v0.2.0/go.mod h1:q8bcK0KcYlCgd9e7WYLm9LpyS+YeLd8JVDW6WezmKEw=
-github.com/gobwas/ws v1.0.2 h1:CoAavW/wd/kulfZmSIBt6p24n4j7tHgNVCjsfHVNUbo=
-github.com/gobwas/ws v1.0.2/go.mod h1:szmBTxLgaFppYjEmNtny/v3w89xOydFnnZMcgRRu/EM=
 github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/pprof v0.0.0-20190515194954-54271f7e092f h1:Jnx61latede7zDD3DiiP4gmNz33uK0U5HDUaF0a/HVQ=
-github.com/google/pprof v0.0.0-20190515194954-54271f7e092f/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
-github.com/google/pprof v0.0.0-20190908185732-236ed259b199 h1:sEyCq3pOT7tNC+3gcLI7sZkBDgntZ6wQJNmr9lmIjIc=
-github.com/google/pprof v0.0.0-20190908185732-236ed259b199/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
-github.com/knq/sysutil v0.0.0-20181215143952-f05b59f0f307 h1:vl4eIlySbjertFaNwiMjXsGrFVK25aOWLq7n+3gh2ls=
-github.com/knq/sysutil v0.0.0-20181215143952-f05b59f0f307/go.mod h1:BjPj+aVjl9FW/cCGiF3nGh5v+9Gd3VCgBQbod/GlMaQ=
 github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
-github.com/mailru/easyjson v0.0.0-20190403194419-1ea4449da983/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
-github.com/mailru/easyjson v0.0.0-20190614124828-94de47d64c63/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
-github.com/mailru/easyjson v0.0.0-20190620125010-da37f6c1e481 h1:IaSjLMT6WvkoZZjspGxy3rdaTEmWLoRm49WbtVUi9sA=
-github.com/mailru/easyjson v0.0.0-20190620125010-da37f6c1e481/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
-github.com/mailru/easyjson v0.0.0-20190626092158-b2ccc519800e/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
-github.com/mailru/easyjson v0.7.0 h1:aizVhC/NAAcKWb+5QsU1iNOZb4Yws5UO2I+aIprQITM=
-github.com/mailru/easyjson v0.7.0/go.mod h1:KAzv3t3aY1NaHWoQz1+4F1ccyAH66Jk7yos7ldAVICs=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
-github.com/twitchyliquid64/golang-asm v0.0.0-20190126203739-365674df15fc h1:RTUQlKzoZZVG3umWNzOYeFecQLIh+dbxXvJp1zPQJTI=
-github.com/twitchyliquid64/golang-asm v0.0.0-20190126203739-365674df15fc/go.mod h1:NoCfSFWosfqMqmmD7hApkirIK9ozpHjxRnRxs1l413A=
-go.coder.com/go-tools v0.0.0-20190317003359-0c6a35b74a16 h1:3gGa1bM0nG7Ruhu5b7wKnoOOwAD/fJ8iyyAcpOzDG3A=
-go.coder.com/go-tools v0.0.0-20190317003359-0c6a35b74a16/go.mod h1:iKV5yK9t+J5nG9O3uF6KYdPEz3dyfMyB15MN1rbQ8Qw=
 go.uber.org/atomic v1.4.0 h1:cxzIVoETapQEqDhQu3QfnvXAV4AlzcvUCxkVUFw3+EU=
 go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/multierr v1.1.0 h1:HoEmRHQPVSqub6w2z2d2EOVs2fjyFRGyofhKuyDq0QI=
 go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 h1:VklqNMn3ovrHsnt90PveolxSbWFaJdECFbxSq0Mqo2M=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/lint v0.0.0-20190909230951-414d861bb4ac h1:8R1esu+8QioDxo4E4mX6bFztO+dMTM49DNAaWfO5OeY=
-golang.org/x/lint v0.0.0-20190909230951-414d861bb4ac/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
-golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwLmSJpwZ1yqXm8j0v2QI=
-golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190306220234-b354f8bf4d9e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190618155005-516e3c20635f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190712062909-fae7ac547cb7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190927073244-c990c680b611 h1:q9u40nxWT5zRClI/uU9dHCiYGottAg6Nzz4YUQyHxdA=
-golang.org/x/sys v0.0.0-20190927073244-c990c680b611/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 h1:SvFZT6jyqRaOeXpc5h/JSfZenJ2O330aBsf7JfSUXmQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
-golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/tools v0.0.0-20190920225731-5eefd052ad72 h1:bw9doJza/SFBEweII/rHQh338oozWyiFsBRHtrflcws=
-golang.org/x/tools v0.0.0-20190920225731-5eefd052ad72/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7 h1:9zdDQZ7Thm29KFXgAX/+yaf3eVbP7djjWp/dXAppNCc=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
diff --git a/internal/wsjstest/main.go b/internal/wsjstest/main.go
index 8145061b1c708a403c52fbf6d1132d38955bd9f3..5251fb84edec0e7823a005fba24972ec0a5908e2 100644
--- a/internal/wsjstest/main.go
+++ b/internal/wsjstest/main.go
@@ -6,19 +6,60 @@ import (
 	"errors"
 	"fmt"
 	"log"
+	"net"
 	"net/http"
-	"net/http/httptest"
 	"os"
-	"os/signal"
-	"strings"
-	"syscall"
+	"os/exec"
 
 	"nhooyr.io/websocket"
 	"nhooyr.io/websocket/internal/wsecho"
 )
 
+func fork() net.Listener {
+	if os.Getenv("FORKED") != "" {
+		f := os.NewFile(3, "listener")
+		l, err := net.FileListener(f)
+		if err != nil {
+			log.Fatalf("failed to create listener from fd: %+v", err)
+		}
+		return l
+	}
+
+	l, err := net.Listen("tcp", "localhost:0")
+	if err != nil {
+		log.Fatalf("failed to listen: %+v", err)
+	}
+	f, err := l.(*net.TCPListener).File()
+	if err != nil {
+		log.Fatalf("failed to get file from tcp listener: %+v", err)
+	}
+
+	cmd := exec.Command(os.Args[0])
+	cmd.Stderr = os.Stderr
+	cmd.Env = append(os.Environ(),
+		fmt.Sprintf("FORKED=true"),
+	)
+	cmd.ExtraFiles = append(cmd.ExtraFiles, f)
+	err = cmd.Start()
+	if err != nil {
+		log.Fatalf("failed to start command: %+v", err)
+	}
+
+	fmt.Printf("ws://%v\n", l.Addr().String())
+	os.Exit(0)
+
+	panic("unreachable")
+}
+
 func main() {
-	s := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	l := fork()
+
+	err := serve(l)
+	log.Fatalf("failed to serve: %+v", err)
+}
+
+func serve(l net.Listener) error {
+	return http.Serve(l, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		c, err := websocket.Accept(w, r, &websocket.AcceptOptions{
 			Subprotocols:       []string{"echo"},
 			InsecureSkipVerify: true,
@@ -36,11 +77,4 @@ func main() {
 		}
 	}))
 
-	wsURL := strings.Replace(s.URL, "http", "ws", 1)
-	fmt.Printf("%v\n", wsURL)
-
-	sigs := make(chan os.Signal)
-	signal.Notify(sigs, syscall.SIGTERM)
-
-	<-sigs
 }
diff --git a/package.json b/package.json
deleted file mode 100644
index a8f436b050c60482a5499f972f4ec7d1b49a0200..0000000000000000000000000000000000000000
--- a/package.json
+++ /dev/null
@@ -1,27 +0,0 @@
-{
-	"private": true,
-	"devDependencies": {
-		"@types/await-timeout": "^0.3.1",
-		"@types/child-process-promise": "^2.2.1",
-		"@types/node": "^12.7.9",
-		"@typescript-eslint/eslint-plugin": "^2.3.2",
-		"@typescript-eslint/parser": "^2.3.2",
-		"await-timeout": "^0.6.0",
-		"axios": "^0.19.0",
-		"child-process-promise": "^2.2.1",
-		"eslint": "^6.5.1",
-		"eslint-config-prettier": "^6.3.0",
-		"eslint-plugin-import": "^2.18.2",
-		"prettier": "^1.18.2",
-		"replace-in-file": "^4.1.3",
-		"ts-node": "^8.4.1",
-		"typescript": "^3.6.3"
-	},
-	"scripts": {
-		"fmt": "./ci/fmt.ts",
-		"lint": "./ci/lint.ts",
-		"test": "./ci/test.ts",
-		"ci": "./ci/all.ts",
-		"push-ci-image": "ci/image/push.ts"
-	}
-}
diff --git a/yarn.lock b/yarn.lock
deleted file mode 100644
index a8690d812350193b6064fbb4ecb7c7bbf72762eb..0000000000000000000000000000000000000000
--- a/yarn.lock
+++ /dev/null
@@ -1,1503 +0,0 @@
-# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
-# yarn lockfile v1
-
-
-"@babel/code-frame@^7.0.0":
-  version "7.5.5"
-  resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.5.5.tgz#bc0782f6d69f7b7d49531219699b988f669a8f9d"
-  integrity sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==
-  dependencies:
-    "@babel/highlight" "^7.0.0"
-
-"@babel/highlight@^7.0.0":
-  version "7.5.0"
-  resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.5.0.tgz#56d11312bd9248fa619591d02472be6e8cb32540"
-  integrity sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==
-  dependencies:
-    chalk "^2.0.0"
-    esutils "^2.0.2"
-    js-tokens "^4.0.0"
-
-"@types/await-timeout@^0.3.1":
-  version "0.3.1"
-  resolved "https://registry.yarnpkg.com/@types/await-timeout/-/await-timeout-0.3.1.tgz#3a0baafc3a96c7a14447a4dcfdcc76b21ce97c3b"
-  integrity sha512-H5PzROT4KuP7XQDua13Iw8did//OCKAZ/3TL15DjvMzDonrk4HvhH1+tLko96f2guU6XaD3AoqRa49ZOwbwNig==
-
-"@types/child-process-promise@^2.2.1":
-  version "2.2.1"
-  resolved "https://registry.yarnpkg.com/@types/child-process-promise/-/child-process-promise-2.2.1.tgz#049033bef102f77a1719b38672cc86a2c4710ab1"
-  integrity sha512-xZ4kkF82YkmqPCERqV9Tj0bVQj3Tk36BqGlNgxv5XhifgDRhwAqp+of+sccksdpZRbbPsNwMOkmUqOnLgxKtGw==
-  dependencies:
-    "@types/node" "*"
-
-"@types/eslint-visitor-keys@^1.0.0":
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz#1ee30d79544ca84d68d4b3cdb0af4f205663dd2d"
-  integrity sha512-OCutwjDZ4aFS6PB1UZ988C4YgwlBHJd6wCeQqaLdmadZ/7e+w79+hbMUFC1QXDNCmdyoRfAFdm0RypzwR+Qpag==
-
-"@types/json-schema@^7.0.3":
-  version "7.0.3"
-  resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.3.tgz#bdfd69d61e464dcc81b25159c270d75a73c1a636"
-  integrity sha512-Il2DtDVRGDcqjDtE+rF8iqg1CArehSK84HZJCT7AMITlyXRBpuPhqGLDQMowraqqu1coEaimg4ZOqggt6L6L+A==
-
-"@types/node@*", "@types/node@^12.7.9":
-  version "12.7.9"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-12.7.9.tgz#da0210f91096aa67138cf5afd04c4d629f8a406a"
-  integrity sha512-P57oKTJ/vYivL2BCfxCC5tQjlS8qW31pbOL6qt99Yrjm95YdHgNZwjrTTjMBh+C2/y6PXIX4oz253+jUzxKKfQ==
-
-"@typescript-eslint/eslint-plugin@^2.3.2":
-  version "2.3.2"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-2.3.2.tgz#7e112ca0bb29044d915baf10163a8199a20f7c69"
-  integrity sha512-tcnpksq1bXzcIRbYLeXkgp6l+ggEMXXUcl1wsSvL807fRtmvVQKygElwEUf4hBA76dNag3VAK1q2m3vd7qJaZA==
-  dependencies:
-    "@typescript-eslint/experimental-utils" "2.3.2"
-    eslint-utils "^1.4.2"
-    functional-red-black-tree "^1.0.1"
-    regexpp "^2.0.1"
-    tsutils "^3.17.1"
-
-"@typescript-eslint/experimental-utils@2.3.2":
-  version "2.3.2"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-2.3.2.tgz#e50f31264507e6fec7b33840bb6af260c24f4ea8"
-  integrity sha512-t+JGdTT6dRbmvKDlhlVkEueoZa0fhJNfG6z2cpnRPLwm3VwYr2BjR//acJGC1Yza0I9ZNcDfRY7ubQEvvfG6Jg==
-  dependencies:
-    "@types/json-schema" "^7.0.3"
-    "@typescript-eslint/typescript-estree" "2.3.2"
-    eslint-scope "^5.0.0"
-
-"@typescript-eslint/parser@^2.3.2":
-  version "2.3.2"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-2.3.2.tgz#e9b742e191cd1209930da469cde379591ad0af5b"
-  integrity sha512-nq1UQeNGdKdqdgF6Ww+Ov2OidWgiL96+JYdXXZ2rkP/OWyc6KMNSbs6MpRCpI8q+PmDa7hBnHNQIo7w/drYccA==
-  dependencies:
-    "@types/eslint-visitor-keys" "^1.0.0"
-    "@typescript-eslint/experimental-utils" "2.3.2"
-    "@typescript-eslint/typescript-estree" "2.3.2"
-    eslint-visitor-keys "^1.1.0"
-
-"@typescript-eslint/typescript-estree@2.3.2":
-  version "2.3.2"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-2.3.2.tgz#107414aa04e689fe6f7251eb63fb500217f2b7f4"
-  integrity sha512-eZNEAai16nwyhIVIEaWQlaUgAU3S9CkQ58qvK0+3IuSdLJD3W1PNuehQFMIhW/mTP1oFR9GNoTcLg7gtXz6lzA==
-  dependencies:
-    glob "^7.1.4"
-    is-glob "^4.0.1"
-    lodash.unescape "4.0.1"
-    semver "^6.3.0"
-
-acorn-jsx@^5.0.2:
-  version "5.0.2"
-  resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-5.0.2.tgz#84b68ea44b373c4f8686023a551f61a21b7c4a4f"
-  integrity sha512-tiNTrP1MP0QrChmD2DdupCr6HWSFeKVw5d/dHTu4Y7rkAkRhU/Dt7dphAfIUyxtHpl/eBVip5uTNSpQJHylpAw==
-
-acorn@^7.0.0:
-  version "7.1.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.1.0.tgz#949d36f2c292535da602283586c2477c57eb2d6c"
-  integrity sha512-kL5CuoXA/dgxlBbVrflsflzQ3PAas7RYZB52NOm/6839iVYJgKMJ3cQJD+t2i5+qFa8h3MDpEOJiS64E8JLnSQ==
-
-ajv@^6.10.0, ajv@^6.10.2:
-  version "6.10.2"
-  resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.10.2.tgz#d3cea04d6b017b2894ad69040fec8b623eb4bd52"
-  integrity sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==
-  dependencies:
-    fast-deep-equal "^2.0.1"
-    fast-json-stable-stringify "^2.0.0"
-    json-schema-traverse "^0.4.1"
-    uri-js "^4.2.2"
-
-ansi-escapes@^3.2.0:
-  version "3.2.0"
-  resolved "https://registry.yarnpkg.com/ansi-escapes/-/ansi-escapes-3.2.0.tgz#8780b98ff9dbf5638152d1f1fe5c1d7b4442976b"
-  integrity sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==
-
-ansi-regex@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-3.0.0.tgz#ed0317c322064f79466c02966bddb605ab37d998"
-  integrity sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=
-
-ansi-regex@^4.1.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-4.1.0.tgz#8b9f8f08cf1acb843756a839ca8c7e3168c51997"
-  integrity sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==
-
-ansi-styles@^3.2.0, ansi-styles@^3.2.1:
-  version "3.2.1"
-  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-3.2.1.tgz#41fbb20243e50b12be0f04b8dedbf07520ce841d"
-  integrity sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==
-  dependencies:
-    color-convert "^1.9.0"
-
-arg@^4.1.0:
-  version "4.1.1"
-  resolved "https://registry.yarnpkg.com/arg/-/arg-4.1.1.tgz#485f8e7c390ce4c5f78257dbea80d4be11feda4c"
-  integrity sha512-SlmP3fEA88MBv0PypnXZ8ZfJhwmDeIE3SP71j37AiXQBXYosPV0x6uISAaHYSlSVhmHOVkomen0tbGk6Anlebw==
-
-argparse@^1.0.7:
-  version "1.0.10"
-  resolved "https://registry.yarnpkg.com/argparse/-/argparse-1.0.10.tgz#bcd6791ea5ae09725e17e5ad988134cd40b3d911"
-  integrity sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==
-  dependencies:
-    sprintf-js "~1.0.2"
-
-array-includes@^3.0.3:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/array-includes/-/array-includes-3.0.3.tgz#184b48f62d92d7452bb31b323165c7f8bd02266d"
-  integrity sha1-GEtI9i2S10UrsxsyMWXH+L0CJm0=
-  dependencies:
-    define-properties "^1.1.2"
-    es-abstract "^1.7.0"
-
-astral-regex@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/astral-regex/-/astral-regex-1.0.0.tgz#6c8c3fb827dd43ee3918f27b82782ab7658a6fd9"
-  integrity sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==
-
-await-timeout@^0.6.0:
-  version "0.6.0"
-  resolved "https://registry.yarnpkg.com/await-timeout/-/await-timeout-0.6.0.tgz#efb52f5dba4d5fea6cff043705b09c97e7c403dc"
-  integrity sha512-eMGnZxbqnmYTxCPqSYk5paIbPgcX8auC0UyVMScYMPY8pYmdk6o2wqQGw+SyN2hrhaDVZIQHVZX8DaHuBoRZcg==
-
-axios@^0.19.0:
-  version "0.19.0"
-  resolved "https://registry.yarnpkg.com/axios/-/axios-0.19.0.tgz#8e09bff3d9122e133f7b8101c8fbdd00ed3d2ab8"
-  integrity sha512-1uvKqKQta3KBxIz14F2v06AEHZ/dIoeKfbTRkK1E5oqjDnuEerLmYTgJB5AiQZHJcljpg1TuRzdjDR06qNk0DQ==
-  dependencies:
-    follow-redirects "1.5.10"
-    is-buffer "^2.0.2"
-
-balanced-match@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
-  integrity sha1-ibTRmasr7kneFk6gK4nORi1xt2c=
-
-brace-expansion@^1.1.7:
-  version "1.1.11"
-  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
-  integrity sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==
-  dependencies:
-    balanced-match "^1.0.0"
-    concat-map "0.0.1"
-
-buffer-from@^1.0.0:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.1.1.tgz#32713bc028f75c02fdb710d7c7bcec1f2c6070ef"
-  integrity sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==
-
-callsites@^3.0.0:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/callsites/-/callsites-3.1.0.tgz#b3630abd8943432f54b3f0519238e33cd7df2f73"
-  integrity sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==
-
-camelcase@^5.0.0:
-  version "5.3.1"
-  resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-5.3.1.tgz#e3c9b31569e106811df242f715725a1f4c494320"
-  integrity sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==
-
-chalk@^2.0.0, chalk@^2.1.0, chalk@^2.4.2:
-  version "2.4.2"
-  resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.2.tgz#cd42541677a54333cf541a49108c1432b44c9424"
-  integrity sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==
-  dependencies:
-    ansi-styles "^3.2.1"
-    escape-string-regexp "^1.0.5"
-    supports-color "^5.3.0"
-
-chardet@^0.7.0:
-  version "0.7.0"
-  resolved "https://registry.yarnpkg.com/chardet/-/chardet-0.7.0.tgz#90094849f0937f2eedc2425d0d28a9e5f0cbad9e"
-  integrity sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==
-
-child-process-promise@^2.2.1:
-  version "2.2.1"
-  resolved "https://registry.yarnpkg.com/child-process-promise/-/child-process-promise-2.2.1.tgz#4730a11ef610fad450b8f223c79d31d7bdad8074"
-  integrity sha1-RzChHvYQ+tRQuPIjx50x172tgHQ=
-  dependencies:
-    cross-spawn "^4.0.2"
-    node-version "^1.0.0"
-    promise-polyfill "^6.0.1"
-
-cli-cursor@^2.1.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/cli-cursor/-/cli-cursor-2.1.0.tgz#b35dac376479facc3e94747d41d0d0f5238ffcb5"
-  integrity sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=
-  dependencies:
-    restore-cursor "^2.0.0"
-
-cli-width@^2.0.0:
-  version "2.2.0"
-  resolved "https://registry.yarnpkg.com/cli-width/-/cli-width-2.2.0.tgz#ff19ede8a9a5e579324147b0c11f0fbcbabed639"
-  integrity sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=
-
-cliui@^5.0.0:
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