Deno v2.0.0 — Release Notes & Engineering Impact

### 2.0.0 / 2024.10.09 Read announcement blog post at: https://deno.com/blog/v2.0 - BREAKING: `DENO_FUTURE=1` by default, or welcome to Deno 2.0 (#25213) - BREAKING: disallow `new Deno.FsFile()` (#25478) - BREAKING: drop support for Deno.run.{clearEnv,gid,uid} (#25371) - BREAKING: improve types for `Deno.serve` (#25369) - BREAKING: improved error code accuracy (#25383) - BREAKING: make supported compilerOptions an allow list (#25432) - BREAKING: move `width` and `height` options to `UnsafeWindowSurface` constructor (#24200) - BREAKING: remove --allow-hrtime (#25367) - BREAKING: remove "emit" and "map" from deno info output (#25468) - BREAKING: remove `--allow-none` flag (#25337) - BREAKING: remove `--jobs` flag (#25336) - BREAKING: remove `--trace-ops` (#25344) - BREAKING: remove `--ts` flag (#25338) - BREAKING: remove `--unstable` flag (#25522) - BREAKING: remove `deno bundle` (#25339) - BREAKING: remove `deno vendor` (#25343) - BREAKING: remove `Deno.[Tls]Listener.prototype.rid` (#25556) - BREAKING: remove `Deno.{Conn,TlsConn,TcpConn,UnixConn}.prototype.rid` (#25446) - BREAKING: remove `Deno.{Reader,Writer}[Sync]` and `Deno.Closer` (#25524) - BREAKING: remove `Deno.Buffer` (#25441) - BREAKING: remove `Deno.close()` (#25347) - BREAKING: remove `Deno.ConnectTlsOptions.{certChain,certFile,privateKey}` and `Deno.ListenTlsOptions.certChain,certFile,keyFile}` (#25525) - BREAKING: remove `Deno.copy()` (#25345) - BREAKING: remove `Deno.customInspect` (#25348) - BREAKING: remove `Deno.fdatasync[Sync]()` (#25520) - BREAKING: remove `Deno.File` (#25447) - BREAKING: remove `Deno.flock[Sync]()` (#25350) - BREAKING: remove `Deno.FsFile.prototype.rid` (#25499) - BREAKING: remove `Deno.fstat[Sync]()` (#25351) - BREAKING: remove `Deno.FsWatcher.prototype.rid` (#25444) - BREAKING: remove `Deno.fsync[Sync]()` (#25448) - BREAKING: remove `Deno.ftruncate[Sync]()` (#25412) - BREAKING: remove `Deno.funlock[Sync]()` (#25442) - BREAKING: remove `Deno.futime[Sync]()` (#25252) - BREAKING: remove `Deno.iter[Sync]()` (#25346) - BREAKING: remove `Deno.read[Sync]()` (#25409) - BREAKING: remove `Deno.readAll[Sync]()` (#25386) - BREAKING: remove `Deno.seek[Sync]()` (#25449) - BREAKING: remove `Deno.Seeker[Sync]` (#25551) - BREAKING: remove `Deno.shutdown()` (#25253) - BREAKING: remove `Deno.write[Sync]()` (#25408) - BREAKING: remove `Deno.writeAll[Sync]()` (#25407) - BREAKING: remove deprecated `UnsafeFnPointer` constructor type with untyped `Deno.PointerObject` parameter (#25577) - BREAKING: remove deprecated files config (#25535) - BREAKING: Remove obsoleted Temporal APIs part 2 (#25505) - BREAKING: remove remaining web types for compatibility (#25334) - BREAKING: remove support for remote import maps in deno.json (#25836) - BREAKING: rename "deps" remote cache folder to "remote" (#25969) - BREAKING: soft-remove `Deno.isatty()` (#25410) - BREAKING: soft-remove `Deno.run()` (#25403) - BREAKING: soft-remove `Deno.serveHttp()` (#25451) - BREAKING: undeprecate `Deno.FsWatcher.prototype.return()` (#25623) - feat: add `--allow-import` flag (#25469) - feat: Add a hint on error about 'Relative import path ... not prefixed with ...' (#25430) - feat: Add better error messages for unstable APIs (#25519) - feat: Add suggestion for packages using Node-API addons (#25975) - feat: Allow importing .cjs files (#25426) - feat: default to TS for file extension and support ext flag in more scenarios (#25472) - feat: deprecate import assertions (#25281) - feat: Don't warn about --allow-script when using esbuild (#25894) - feat: hide several --unstable-* flags (#25378) - feat: improve lockfile v4 to store normalized version constraints and be more terse (#25247) - feat: improve warnings for deprecations and lifecycle script for npm packages (#25694) - feat: include version number in all --json based outputs (#25335) - feat: lockfile v4 by default (#25165) - feat: make 'globalThis.location' a configurable property (#25812) - feat: print `Listening on` messages on stderr instead of stdout (#25491) - feat: remove `--lock-write` flag (#25214) - feat: require jsr prefix for `deno install` and `deno add` (#25698) - feat: require(esm) (#25501) - feat: Show hints when using `window` global (#25805) - feat: stabilize `Deno.createHttpClient()` (#25569) - feat: suggest `deno install --entrypoint` instead of `deno cache` (#25228) - feat: support DENO_LOG env var instead of RUST_LOG (#25356) - feat: TypeScript 5.6 and `npm:@types/node@22` (#25614) - feat: Update no-window lint rule (#25486) - feat: update warning message for --allow-run with no list (#25693) - feat: warn when using `--allow-run` with no allow list (#25215) - feat(add): Add npm packages to package.json if present (#25477) - feat(add): strip package subpath when adding a package (#25419) - feat(add/install): Flag to add dev dependency to package.json (#25495) - feat(byonm): support `deno run npm:<package>` when package is not in package.json (#25981) - feat(check): turn on noImplicitOverride (#25695) - feat(check): turn on useUnknownInCatchVariables (#25465) - feat(cli): evaluate code snippets in JSDoc and markdown (#25220) - feat(cli): give access to `process` global everywhere (#25291) - feat(cli): use NotCapable error for permission errors (#25431) - feat(config): Node modules option for 2.0 (#25299) - feat(ext/crypto): import and export p521 keys (#25789) - feat(ext/crypto): X448 support (#26043) - feat(ext/kv): configurable limit params (#25174) - feat(ext/node): add abort helpers, process & streams fix (#25262) - feat(ext/node): add rootCertificates to node:tls (#25707) - feat(ext/node): buffer.transcode() (#25972) - feat(ext/node): export 'promises' symbol from 'node:timers' (#25589) - feat(ext/node): export missing constants from 'zlib' module (#25584) - feat(ext/node): export missing symbols from domain, puncode, repl, tls (#25585) - feat(ext/node): export more symbols from streams and timers/promises (#25582) - feat(ext/node): expose ES modules for _ modules (#25588) - feat(flags): allow double commas to escape values in path based flags (#25453) - feat(flags): support user provided args in repl subcommand (#25605) - feat(fmt): better error on malfored HTML files (#25853) - feat(fmt): stabilize CSS, HTML and YAML formatters (#25753) - feat(fmt): support vto and njk extensions (#25831) - feat(fmt): upgrade markup_fmt (#25768) - feat(install): deno install with entrypoint (#25411) - feat(install): warn repeatedly about not-run lifecycle scripts on explicit installs (#25878) - feat(lint): add `no-process-global` lint rule (#25709) - feat(lsp): add a message when someone runs 'deno lsp' manually (#26051) - feat(lsp): auto-import types with 'import type' (#25662) - feat(lsp): html/css/yaml file formatting (#25353) - feat(lsp): quick fix for @deno-types="npm:@types/*" (#25954) - feat(lsp): turn on useUnknownInCatchVariables (#25474) - feat(lsp): unstable setting as list (#25552) - feat(permissions): `Deno.mainModule` doesn't require permissions (#25667) - feat(permissions): allow importing from cdn.jsdelivr.net by default (#26013) - feat(serve): Support second parameter in deno serve (#25606) - feat(tools/doc): display subitems in symbol overviews where applicable (#25885) - feat(uninstall): alias to 'deno remove' if -g flag missing (#25461) - feat(upgrade): better error message on failure (#25503) - feat(upgrade): print info links for Deno 2 RC releases (#25225) - feat(upgrade): support LTS release channel (#25123) - fix: add link to env var docs (#25557) - fix: add suggestion how to fix importing CJS module (#21764) - fix: add test ensuring als works across dynamic import (#25593) - fix: better error for Deno.UnsafeWindowSurface, correct HttpClient name, cleanup unused code (#25833) - fix: cjs resolution cases (#25739) - fix: consistent with deno_config and treat `"experimentalDecorators"` as deprecated (#25735) - fix: delete old Deno 1.x headers file when loading cache (#25283) - fix: do not panic running invalid file specifier (#25530) - fix: don't include extensionless files in file collection for lint & fmt by default (#25721) - fix: don't prompt when using `Deno.permissions.request` with `--no-prompt` (#25811) - fix: eagerly error for specifier with empty version constraint (#25944) - fix: enable `Win32_Security` feature in `windows-sys` (#26007) - fix: error on unsupported compiler options (#25714) - fix: error out if a valid flag is passed before a subcommand (#25830) - fix: fix jupyter display function type (#25326) - fix: Float16Array type (#25506) - fix: handle showing warnings while the progress bar is shown (#25187) - fix: Hide 'deno cache' from help output (#25960) - fix: invalid ipv6 hostname on `deno serve` (#25482) - fix: linux canonicalization checks (#24641) - fix: lock down allow-run permissions more (#25370) - fix: make some warnings more standard (#25324) - fix: no cmd prefix in help output go links (#25459) - fix: only enable byonm if workspace root has pkg json (#25379) - fix: panic when require(esm) (#25769) - fix: precompile preserve SVG camelCase attributes (#25945) - fix: reland async context (#25140) - fix: remove --allow-run warning when using deno without args or subcommand (#25684) - fix: remove entrypoint hack for Deno 2.0 (#25332) - fix: remove recently added deno.json node_modules aliasing (#25542) - fix: remove the typo in the help message (#25962) - fix: removed unstable-htttp from deno help (#25216) - fix: replace `npm install` hint with `deno install` hint (#25244) - fix: trim space around DENO_AUTH_TOKENS (#25147) - fix: update deno_doc (#25290) - fix: Update deno_npm to fix `deno install` with crossws (#25837) - fix: update hint for `deno add <package>` (#25455) - fix: update malva in deno to support astro css comments (#25553) - fix: update nodeModulesDir config JSON schema (#25653) - fix: update patchver to 0.2 (#25952) - fix: update sui to 0.4 (#25942) - fix: upgrade deno_ast 0.42 (#25313) - fix: upgrade deno_core to 0.307.0 (#25287) - fix(add/install): default to "latest" tag for npm packages in `deno add npm:pkg` (#25858) - fix(bench): Fix table column alignments and NO_COLOR=1 (#25190) - fix(BREAKING): make dns record types have consistent naming (#25357) - fix(byonm): resolve npm deps of jsr deps (#25399) - fix(check): ignore noImplicitOverrides in remote modules (#25854) - fix(check): move is cjs check from resolving to loading (#25597) - fix(check): properly surface dependency errors in types file of js file (#25860) - fix(cli): `deno task` exit with status 0 (#25637) - fix(cli): Default to auto with --node-modules-dir flag (#25772) - fix(cli): handle edge cases around `export`s in doc tests and default export (#25720) - fix(cli): Map error kind to `PermissionDenied` when symlinking fails due to permissions (#25398) - fix(cli): Only set allow net flag for deno serve if not already allowed all (#25743) - fix(cli): Warn on not-run lifecycle scripts with global cache (#25786) - fix(cli/tools): correct `deno init --serve` template behavior (#25318) - fix(compile): support 'deno compile' in RC and LTS releases (#25875) - fix(config): validate export names (#25436) - fix(coverage): ignore urls from doc testing (#25736) - fix(doc): surface graph errors as warnings (#25888) - fix(dts): stabilize `fetch` declaration for use with `Deno.HttpClient` (#25683) - fix(ext/console): more precision in console.time (#25723) - fix(ext/console): prevent duplicate error printing when the cause is assigned (#25327) - fix(ext/crypto): ensure EC public keys are exported uncompressed (#25766) - fix(ext/crypto): fix identity test for x25519 derive bits (#26011) - fix(ext/crypto): reject empty usages in SubtleCrypto#importKey (#25759) - fix(ext/crypto): support md4 digest algorithm (#25656) - fix(ext/crypto): throw DataError for invalid EC key import (#25181) - fix(ext/fetch): fix lowercase http_proxy classified as https (#25686) - fix(ext/fetch): percent decode userinfo when parsing proxies (#25229) - fix(ext/http): do not set localhost to hostname unnecessarily (#24777) - fix(ext/http): gracefully handle Response.error responses (#25712) - fix(ext/node): add `FileHandle#writeFile` (#25555) - fix(ext/node): add `vm.constants` (#25630) - fix(ext/node): Add missing `node:path` exports (#25567) - fix(ext/node): Add missing node:fs and node:constants exports (#25568) - fix(ext/node): add stubs for `node:trace_events` (#25628) - fix(ext/node): attach console stream properties (#25617) - fix(ext/node): avoid showing `UNKNOWN` error from TCP handle (#25550) - fix(ext/node): close upgraded socket when the underlying http connection is closed (#25387) - fix(ext/node): delay accept() call 2 ticks in net.Server#listen (#25481) - fix(ext/node): don't throw error for unsupported signal binding on windows (#25699) - fix(ext/node): emit `online` event after worker thread is initialized (#25243) - fix(ext/node): export `process.allowedNodeEnvironmentFlags` (#25629) - fix(ext/node): export JWK public key (#25239) - fix(ext/node): export request and response clases from `http2` module (#25592) - fix(ext/node): fix `Cipheriv#update(string, undefined)` (#25571) - fix(ext/node): fix Decipheriv when autoPadding disabled (#25598) - fix(ext/node): fix process.stdin.pause() (#25864) - fix(ext/node): Fix vm sandbox object panic (#24985) - fix(ext/node): http2session ready state (#25143) - fix(ext/node): Implement detached option in `child_process` (#25218) - fix(ext/node): import EC JWK keys (#25266) - fix(ext/node): import JWK octet key pairs (#25180) - fix(ext/node): import RSA JWK keys (#25267) - fix(ext/node): register `node:wasi` built-in (#25134) - fix(ext/node): remove unimplemented promiseHook stubs (#25979) - fix(ext/node): report freemem() on Linux in bytes (#25511) - fix(ext/node): Rewrite `node:v8` serialize/deserialize (#25439) - fix(ext/node): session close during stream setup (#25170) - fix(ext/node): Stream should be instance of EventEmitter (#25527) - fix(ext/node): stub `inspector/promises` (#25635) - fix(ext/node): stub `process.cpuUsage()` (#25462) - fix(ext/node): stub cpu_info() for OpenBSD (#25807) - fix(ext/node): support x509 certificates in `createPublicKey` (#25731) - fix(ext/node): throw when loading `cpu-features` module (#25257) - fix(ext/node): update aead-gcm-stream to 0.3 (#25261) - fix(ext/node): use primordials in `ext/node/polyfills/console.ts` (#25572) - fix(ext/node): use primordials in ext/node/polyfills/wasi.ts (#25608) - fix(ext/node): validate input lengths in `Cipheriv` and `Decipheriv` (#25570) - fix(ext/web): don't ignore capture in EventTarget.removeEventListener (#25788) - fix(ext/webgpu): allow to build on unsupported platforms (#25202) - fix(ext/webgpu): sync category comment (#25580) - fix(ext/webstorage): make `getOwnPropertyDescriptor` with symbol return `undefined` (#13348) - fix(flags): --allow-all should conflict with lower permissions (#25909) - fix(flags): don't treat empty run command as task subcommand (#25708) - fix(flags): move some content from docs.deno.com into help output (#25951) - fix(flags): properly error out for urls (#25770) - fix(flags): require global flag for permission flags in install subcommand (#25391) - fix(fmt): --check was broken for CSS, YAML and HTML (#25848) - fix(fmt): fix incorrect quotes in components (#25249) - fix(fmt): fix tabs in YAML (#25536) - fix(fmt/markdown): fix regression with multi-line footnotes and inline math (#25222) - fix(info): error instead of panic for npm specifiers when using byonm (#25947) - fix(info): move "version" field to top of json output (#25890) - fix(inspector): Fix panic when re-entering runtime ops (#25537) - fix(install): compare versions directly to decide whether to create a child node_modules dir for a workspace member (#26001) - fix(install): Make sure target node_modules exists when symlinking (#25494) - fix(install): recommend using `deno install -g` when using a single http url (#25388) - fix(install): store tags associated with package in node_modules dir (#26000) - fix(install): surface package.json dependency errors (#26023) - fix(install): Use relative symlinks in deno install (#25164) - fix(installl): make bin entries executable even if not put in `node_modules/.bin` (#25873) - fix(jupyter): allow unstable flags (#25483) - fix(lint): correctly handle old jsx in linter (#25902) - fix(lint): support linting jsr pkg without version field (#25230) - fix(lockfile): use loose deserialization for version constraints (#25660) - fix(lsp): encode url parts before parsing as uri (#25509) - fix(lsp): exclude missing import quick fixes with bad resolutions (#26025) - fix(lsp): panic on url_to_uri() (#25238) - fix(lsp): properly resolve jsxImportSource for caching (#25688) - fix(lsp): update diagnostics on npm install (#25352) - fix(napi): Don't run microtasks in napi_resolve_deferred (#25246) - fix(napi): Fix worker threads importing already-loaded NAPI addon (#25245) - fix(no-slow-types): better `override` handling (#25989) - fix(node): Don't error out if we fail to statically analyze CJS re-export (#25748) - fix(node): fix worker_threads issues blocking Angular support (#26024) - fix(node): implement libuv APIs needed to support `npm:sqlite3` (#25893) - fix(node): Include "node" condition during CJS re-export analysis (#25785) - fix(node): Pass NPM_PROCESS_STATE to subprocesses via temp file instead of env var (#25896) - fix(node/byonm): do not accidentally resolve bare node built-ins (#25543) - fix(node/cluster): improve stubs to make log4js work (#25146) - fix(npm): better error handling for remote npm deps (#25670) - fix(npm): root package has peer dependency on itself (#26022) - fix(permissions): disallow any `LD_` or `DYLD_` prefixed env var without full --allow-run permissions (#25271) - fix(permissions): disallow launching subprocess with LD_PRELOAD env var without full run permissions (#25221) - fix(publish): ensure provenance is spec compliant (#25200) - fix(regression): do not expose resolved path in Deno.Command permission denied error (#25434) - fix(runtime): don't error `child.output()` on consumed stream (#25657) - fix(runtime): use more null proto objects again (#25040) - fix(runtime/web_worker): populate `SnapshotOptions` for `WebWorker` when instantiated without snapshot (#25280) - fix(task): correct name for scoped npm package binaries (#25390) - fix(task): support tasks with colons in name in `deno run` (#25233) - fix(task): use current executable for deno even when not named deno (#26019) - fix(types): simplify mtls related types (#25658) - fix(upgrade): more informative information on invalid version (#25319) - fix(windows): Deno.Command - align binary resolution with linux and mac (#25429) - fix(workspace): handle when config has members when specified via --config (#25988) - perf: fast path for cached dyn imports (#25636) - perf: Use -O3 for sui in release builds (#26010) - perf(cache): single cache file for remote modules (#24983) - perf(cache): single cache file for typescript emit (#24994) - perf(ext/fetch): improve decompression throughput by upgrading `tower_http` (#25806) - perf(ext/node): reduce some allocations in require (#25197) - perf(ext/web): optimize performance.measure() (#25774)