Add eslint, prettier

.editorconfig

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+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+[*.{js,json,yml}]
+charset = utf-8
+indent_style = space
+indent_size = 2

.eslintrc.json

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+{
+  "root": true,
+  "parser": "@typescript-eslint/parser",
+  "plugins": ["@typescript-eslint"],
+  "rules": {
+    "@typescript-eslint/no-non-null-assertion": "off"
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "prettier"
+  ]
+}

.gitignore

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+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
+
+# Swap the comments on the following lines if you don't wish to use zero-installs
+# Documentation here: https://yarnpkg.com/features/zero-installs
+!.yarn/cache
+#.pnp.*

.pnp.loader.mjs

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+import { URL, fileURLToPath, pathToFileURL } from "url";
+import fs from "fs";
+import path from "path";
+import moduleExports, { Module } from "module";
+
+var PathType;
+(function (PathType2) {
+  PathType2[(PathType2["File"] = 0)] = "File";
+  PathType2[(PathType2["Portable"] = 1)] = "Portable";
+  PathType2[(PathType2["Native"] = 2)] = "Native";
+})(PathType || (PathType = {}));
+const npath = Object.create(path);
+const ppath = Object.create(path.posix);
+npath.cwd = () => process.cwd();
+ppath.cwd = () => toPortablePath(process.cwd());
+ppath.resolve = (...segments) => {
+  if (segments.length > 0 && ppath.isAbsolute(segments[0])) {
+    return path.posix.resolve(...segments);
+  } else {
+    return path.posix.resolve(ppath.cwd(), ...segments);
+  }
+};
+const contains = function (pathUtils, from, to) {
+  from = pathUtils.normalize(from);
+  to = pathUtils.normalize(to);
+  if (from === to) return `.`;
+  if (!from.endsWith(pathUtils.sep)) from = from + pathUtils.sep;
+  if (to.startsWith(from)) {
+    return to.slice(from.length);
+  } else {
+    return null;
+  }
+};
+npath.fromPortablePath = fromPortablePath;
+npath.toPortablePath = toPortablePath;
+npath.contains = (from, to) => contains(npath, from, to);
+ppath.contains = (from, to) => contains(ppath, from, to);
+const WINDOWS_PATH_REGEXP = /^([a-zA-Z]:.*)$/;
+const UNC_WINDOWS_PATH_REGEXP = /^\/\/(\.\/)?(.*)$/;
+const PORTABLE_PATH_REGEXP = /^\/([a-zA-Z]:.*)$/;
+const UNC_PORTABLE_PATH_REGEXP = /^\/unc\/(\.dot\/)?(.*)$/;
+function fromPortablePath(p) {
+  if (process.platform !== `win32`) return p;
+  let portablePathMatch, uncPortablePathMatch;
+  if ((portablePathMatch = p.match(PORTABLE_PATH_REGEXP)))
+    p = portablePathMatch[1];
+  else if ((uncPortablePathMatch = p.match(UNC_PORTABLE_PATH_REGEXP)))
+    p = `\\\\${uncPortablePathMatch[1] ? `.\\` : ``}${uncPortablePathMatch[2]}`;
+  else return p;
+  return p.replace(/\//g, `\\`);
+}
+function toPortablePath(p) {
+  if (process.platform !== `win32`) return p;
+  p = p.replace(/\\/g, `/`);
+  let windowsPathMatch, uncWindowsPathMatch;
+  if ((windowsPathMatch = p.match(WINDOWS_PATH_REGEXP)))
+    p = `/${windowsPathMatch[1]}`;
+  else if ((uncWindowsPathMatch = p.match(UNC_WINDOWS_PATH_REGEXP)))
+    p = `/unc/${uncWindowsPathMatch[1] ? `.dot/` : ``}${
+      uncWindowsPathMatch[2]
+    }`;
+  return p;
+}
+
+const builtinModules = new Set(
+  Module.builtinModules || Object.keys(process.binding(`natives`))
+);
+const isBuiltinModule = (request) =>
+  request.startsWith(`node:`) || builtinModules.has(request);
+function readPackageScope(checkPath) {
+  const rootSeparatorIndex = checkPath.indexOf(npath.sep);
+  let separatorIndex;
+  do {
+    separatorIndex = checkPath.lastIndexOf(npath.sep);
+    checkPath = checkPath.slice(0, separatorIndex);
+    if (checkPath.endsWith(`${npath.sep}node_modules`)) return false;
+    const pjson = readPackage(checkPath + npath.sep);
+    if (pjson) {
+      return {
+        data: pjson,
+        path: checkPath,
+      };
+    }
+  } while (separatorIndex > rootSeparatorIndex);
+  return false;
+}
+function readPackage(requestPath) {
+  const jsonPath = npath.resolve(requestPath, `package.json`);
+  if (!fs.existsSync(jsonPath)) return null;
+  return JSON.parse(fs.readFileSync(jsonPath, `utf8`));
+}
+
+async function tryReadFile(path2) {
+  try {
+    return await fs.promises.readFile(path2, `utf8`);
+  } catch (error) {
+    if (error.code === `ENOENT`) return null;
+    throw error;
+  }
+}
+function tryParseURL(str, base) {
+  try {
+    return new URL(str, base);
+  } catch {
+    return null;
+  }
+}
+function getFileFormat(filepath) {
+  var _a, _b;
+  const ext = path.extname(filepath);
+  switch (ext) {
+    case `.mjs`: {
+      return `module`;
+    }
+    case `.cjs`: {
+      return `commonjs`;
+    }
+    case `.wasm`: {
+      throw new Error(`Unknown file extension ".wasm" for ${filepath}`);
+    }
+    case `.json`: {
+      throw new Error(`Unknown file extension ".json" for ${filepath}`);
+    }
+    case `.js`: {
+      const pkg = readPackageScope(filepath);
+      if (!pkg) return `commonjs`;
+      return (_a = pkg.data.type) != null ? _a : `commonjs`;
+    }
+    default: {
+      const isMain = process.argv[1] === filepath;
+      if (!isMain) return null;
+      const pkg = readPackageScope(filepath);
+      if (!pkg) return `commonjs`;
+      if (pkg.data.type === `module`) return null;
+      return (_b = pkg.data.type) != null ? _b : `commonjs`;
+    }
+  }
+}
+
+async function getFormat$1(resolved, context, defaultGetFormat) {
+  const url = tryParseURL(resolved);
+  if ((url == null ? void 0 : url.protocol) !== `file:`)
+    return defaultGetFormat(resolved, context, defaultGetFormat);
+  const format = getFileFormat(fileURLToPath(url));
+  if (format) {
+    return {
+      format,
+    };
+  }
+  return defaultGetFormat(resolved, context, defaultGetFormat);
+}
+
+async function getSource$1(urlString, context, defaultGetSource) {
+  const url = tryParseURL(urlString);
+  if ((url == null ? void 0 : url.protocol) !== `file:`)
+    return defaultGetSource(urlString, context, defaultGetSource);
+  return {
+    source: await fs.promises.readFile(fileURLToPath(url), `utf8`),
+  };
+}
+
+async function load$1(urlString, context, defaultLoad) {
+  const url = tryParseURL(urlString);
+  if ((url == null ? void 0 : url.protocol) !== `file:`)
+    return defaultLoad(urlString, context, defaultLoad);
+  const filePath = fileURLToPath(url);
+  const format = getFileFormat(filePath);
+  if (!format) return defaultLoad(urlString, context, defaultLoad);
+  return {
+    format,
+    source: await fs.promises.readFile(filePath, `utf8`),
+  };
+}
+
+const pathRegExp =
+  /^(?![a-zA-Z]:[\\/]|\\\\|\.{0,2}(?:\/|$))((?:node:)?(?:@[^/]+\/)?[^/]+)\/*(.*|)$/;
+const isRelativeRegexp = /^\.{0,2}\//;
+async function resolve$1(originalSpecifier, context, defaultResolver) {
+  var _a;
+  const { findPnpApi } = moduleExports;
+  if (!findPnpApi || isBuiltinModule(originalSpecifier))
+    return defaultResolver(originalSpecifier, context, defaultResolver);
+  let specifier = originalSpecifier;
+  const url = tryParseURL(
+    specifier,
+    isRelativeRegexp.test(specifier) ? context.parentURL : void 0
+  );
+  if (url) {
+    if (url.protocol !== `file:`)
+      return defaultResolver(originalSpecifier, context, defaultResolver);
+    specifier = fileURLToPath(url);
+  }
+  const { parentURL, conditions = [] } = context;
+  const issuer = parentURL ? fileURLToPath(parentURL) : process.cwd();
+  const pnpapi =
+    (_a = findPnpApi(issuer)) != null ? _a : url ? findPnpApi(specifier) : null;
+  if (!pnpapi)
+    return defaultResolver(originalSpecifier, context, defaultResolver);
+  const dependencyNameMatch = specifier.match(pathRegExp);
+  let allowLegacyResolve = false;
+  if (dependencyNameMatch) {
+    const [, dependencyName, subPath] = dependencyNameMatch;
+    if (subPath === ``) {
+      const resolved = pnpapi.resolveToUnqualified(
+        `${dependencyName}/package.json`,
+        issuer
+      );
+      if (resolved) {
+        const content = await tryReadFile(resolved);
+        if (content) {
+          const pkg = JSON.parse(content);
+          allowLegacyResolve = pkg.exports == null;
+        }
+      }
+    }
+  }
+  const result = pnpapi.resolveRequest(specifier, issuer, {
+    conditions: new Set(conditions),
+    extensions: allowLegacyResolve ? void 0 : [],
+  });
+  if (!result)
+    throw new Error(`Resolving '${specifier}' from '${issuer}' failed`);
+  const resultURL = pathToFileURL(result);
+  if (url) {
+    resultURL.search = url.search;
+    resultURL.hash = url.hash;
+  }
+  return {
+    url: resultURL.href,
+  };
+}
+
+const binding = process.binding(`fs`);
+const originalfstat = binding.fstat;
+const ZIP_FD = 2147483648;
+binding.fstat = function (...args) {
+  const [fd, useBigint, req] = args;
+  if ((fd & ZIP_FD) !== 0 && useBigint === false && req === void 0) {
+    try {
+      const stats = fs.fstatSync(fd);
+      return new Float64Array([
+        stats.dev,
+        stats.mode,
+        stats.nlink,
+        stats.uid,
+        stats.gid,
+        stats.rdev,
+        stats.blksize,
+        stats.ino,
+        stats.size,
+        stats.blocks,
+      ]);
+    } catch {}
+  }
+  return originalfstat.apply(this, args);
+};
+
+const [major, minor] = process.versions.node
+  .split(`.`)
+  .map((value) => parseInt(value, 10));
+const hasConsolidatedHooks = major > 16 || (major === 16 && minor >= 12);
+const resolve = resolve$1;
+const getFormat = hasConsolidatedHooks ? void 0 : getFormat$1;
+const getSource = hasConsolidatedHooks ? void 0 : getSource$1;
+const load = hasConsolidatedHooks ? load$1 : void 0;
+
+export { getFormat, getSource, load, resolve };

.prettierrc.json

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+{}