⚠️ Breaking Change
Impact Score: 7/10
Deno v1.24.0 — Release Notes & Engineering Impact
Source available — automated, not human-reviewed
Component: deno · Channel: stable. Automated analysis, not a compatibility certification. How this works.
Analysis updated: 2026-11-01.
Breaking-change evidence from the source
- BREAKING(unstable): Improve Deno.spawn() stdio API (#14919)
⚡ Executive Summary (TL;DR)
Deno v1.24.0. Source highlight: BREAKING(unstable): Improve Deno.spawn() stdio API (#14919)
Who Does This Impact? (Role-Based Analysis)
💻 Software Engineers & Devs
Check the source notes against the package and APIs you use before upgrading.
📊 Product & Engineering Leads
Use the documented changes to assess relevance to your product; release frequency alone is not a quality measure.
⚙️ DevOps & Security
Verify the target version, runtime requirements and rollback procedure in the official documentation.
⚠️ Breaking Changes & Deprecations (1)
- - BREAKING(unstable): Improve Deno.spawn() stdio API (#14919)
✨ New Features & Capabilities (6)
- feat(cli): support configuring the test tool in the config file (#15079)
- feat(cli/lsp): Sort repl completions (#15171)
- feat(cli/test): add `DENO_JOBS` env variable for `test` subcommand (#14929)
- feat(ext/ffi): Support 64 bit parameters in Fast API calls (#15140)
- feat(fmt): do not add a newline between a template and its tag (#15195)
- feat(test): add `--parallel` flag, soft deprecate `--jobs` (#15259)
⚡ Performance & Enhancements (2)
- BREAKING(unstable): Improve Deno.spawn() stdio API (#14919)
- perf: use emit from swc instead of tsc (#15118)
🔧 Bug Fixes & Patches (6)
- feat(lsp): provide import map remapping diags and fixes (#15165)
- fix(cli): Improve error message in watch mode (#15184)
- fix(cli): expand tsc roots when using checkJs (#15164)
- fix(cli): synchronize async stdio/file reads and writes (#15092)
- fix(cli/dts): allow passing arguments to `WebAssembly` error constructors
- fix(core): unhandled rejection in top-level scope (#15204)
📄 View Raw Release Notes (Original Developer Log)
### 1.24.0 / 2022.07.20
- BREAKING(unstable): Improve Deno.spawn() stdio API (#14919)
- feat(cli): support configuring the test tool in the config file (#15079)
- feat(cli/lsp): Sort repl completions (#15171)
- feat(cli/test): add `DENO_JOBS` env variable for `test` subcommand (#14929)
- feat(ext/ffi): Support 64 bit parameters in Fast API calls (#15140)
- feat(fmt): do not add a newline between a template and its tag (#15195)
- feat(lsp): provide import map remapping diags and fixes (#15165)
- feat(test): add `--parallel` flag, soft deprecate `--jobs` (#15259)
- feat(unstable): Ability to ref/unref "Child" in "Deno.spawnChild()" API
(#15151)
- feat(web): add beforeunload event (#14830)
- feat: add "unhandledrejection" event support (#12994, #15211)
- feat: import.meta.resolve() (#15074)
- fix(cli): Improve error message in watch mode (#15184)
- fix(cli): expand tsc roots when using checkJs (#15164)
- fix(cli): synchronize async stdio/file reads and writes (#15092)
- fix(cli/dts): allow passing arguments to `WebAssembly` error constructors
(#15149)
- fix(core): unhandled rejection in top-level scope (#15204)
- fix(coverage): do not verify emit source hash for coverage (#15260)
- fix(ext/ffi): allow setting a custom lib path for libtcc.a (#15208)
- fix(ext/ffi): i64 arg to C mapping was wrong (#15162)
- fix(ext/web): align DOMException better with spec (#15097)
- fix(fmt): improve curried arrow functions (#15251)
- fix(repl): do not panic for import completions when the import specifier is
empty (#15177)
- fix(task): do not overflow attempting to parse large number as redirect
(#15249)
- fix(task): resolve deno configuration file first from specified `--cwd` arg
(#15257)
- fix: WebSocketStream ping event causes pending promises (#15235)
- fix: fallback to no type checking cache when db file can't be created (#15180)
- fix: revert changes to test output for uncaught errors (#15231)
- perf: emit files on demand and fix racy emit (#15220)
- perf: use emit from swc instead of tsc (#15118)