💻
How are you using Babel?
Other (Next.js, Gatsby, vue-cli, ...)
Input code
const selector_map = Math.random > 0.5 ? new Map<string, string>() : undefined;
const selectors = selector_map?.keys();
for (const selector of (selectors as IterableIterator<string> | undefined) || []) {
}Configuration file name
babel.config.js
Configuration
(BUILD_TARGET is in this case ie11)
let extraPlugins = process.env.BUILD_TARGET === "ie11" ? ["@parcel/babel-plugin-transform-runtime"] : [];
module.exports = {
"presets": ["@parcel/babel-preset-env", "@babel/preset-typescript"],
"plugins": extraPlugins,
};Current and expected behavior
Current behavior:
babel prints this error and something (maybe parcel?) segfaults:
🚨 Build failed.
@parcel/transformer-babel: [project_dir]/src/main.ts: Property types[0] of UnionTypeAnnotation expected node to be of a type ["FlowType"] but instead got "TSUnionType"
TypeError: [project_dir]/src/main.ts: Property types[0] of UnionTypeAnnotation expected node to be of a type ["FlowType"] but instead got "TSUnionType"
at validate ([project_dir]/.yarn/cache/@babel-types-npm-7.17.0-3c936b54e4-12e5a28798.zip/node_modules/@babel/types/lib/definitions/utils.js:131:11)
at validator ([project_dir]/.yarn/cache/@babel-types-npm-7.17.0-3c936b54e4-12e5a28798.zip/node_modules/@babel/types/lib/definitions/utils.js:102:7)
at Object.validate ([project_dir]/.yarn/cache/@babel-types-npm-7.17.0-3c936b54e4-12e5a28798.zip/node_modules/@babel/types/lib/definitions/utils.js:228:7)
at validateField ([project_dir]/.yarn/cache/@babel-types-npm-7.17.0-3c936b54e4-12e5a28798.zip/node_modules/@babel/types/lib/validators/validate.js:24:9)
at validate ([project_dir]/.yarn/cache/@babel-types-npm-7.17.0-3c936b54e4-12e5a28798.zip/node_modules/@babel/types/lib/validators/validate.js:17:3)
at String.builder ([project_dir]/.yarn/cache/@babel-types-npm-7.17.0-3c936b54e4-12e5a28798.zip/node_modules/@babel/types/lib/builders/builder.js:39:27)
at unionTypeAnnotation ([project_dir]/.yarn/cache/@babel-types-npm-7.17.0-3c936b54e4-12e5a28798.zip/node_modules/@babel/types/lib/builders/generated/index.js:813:27)
at createFlowUnionType ([project_dir]/.yarn/cache/@babel-types-npm-7.17.0-3c936b54e4-12e5a28798.zip/node_modules/@babel/types/lib/builders/flow/createFlowUnionType.js:18:47)
at NodePath.LogicalExpression ([project_dir]/.yarn/cache/@babel-traverse-npm-7.17.3-c2bff3e671-780d7ecf71.zip/node_modules/@babel/traverse/lib/path/inference/inferers.js:142:12)
at NodePath._getTypeAnnotation ([project_dir]/.yarn/cache/@babel-traverse-npm-7.17.3-c2bff3e671-780d7ecf71.zip/node_modules/@babel/traverse/lib/path/inference/index.js:82:22)
PID 55422 received SIGSEGV for address: 0xb4f8
0 segfault-handler.node 0x00000001051b3800 _ZL16segfault_handleriP9__siginfoPv + 288
1 libsystem_platform.dylib 0x00007ff801d85e2d _sigtramp + 29
2 ??? 0x0000700011b44e88 0x0 + 123145599340168
3 lmdb.node 0x000000010540bbdf _ZN3Nan11AsyncWorker12WorkCompleteEv + 31
4 lmdb.node 0x000000010540d602 _ZN3Nan20AsyncExecuteCompleteEP9uv_work_si + 18
5 libuv.1.dylib 0x000000010513e9bc uv__work_done + 176
6 libuv.1.dylib 0x00000001051421f1 uv__async_io + 279
7 libuv.1.dylib 0x0000000105151f8c uv__io_poll + 1881
8 libuv.1.dylib 0x000000010514261c uv_run + 349
9 node 0x0000000102e4194a _ZN4node6worker16WorkerThreadDataD2Ev + 220
10 node 0x0000000102e41046 _ZN4node6worker6Worker3RunEv + 1770
11 node 0x0000000102e439bb _ZZN4node6worker6Worker11StartThreadERKN2v820FunctionCallbackInfoINS2_5ValueEEEEN3$_38__invokeEPv + 49
12 libsystem_pthread.dylib 0x00007ff801d704f4 _pthread_start + 125
13 libsystem_pthread.dylib 0x00007ff801d6c00f thread_start + 15
Expected behavior: types are stripped, transpilation succeeds and output code runs.
Environment
- Babel version: 7.17.6 (@babel/core 7.17.5)
- Node: v17.6.0
- Yarn: 3.1.1
- OS: macOS 12.2 (21D49)
Possible solution
No response
Additional context
It also crashes the babel REPL:
https://babeljs.io/repl/#?browsers=IE%2011&build=&builtIns=false&corejs=3.6&spec=false&loose=false&code_lz=MYewdgzgLgBBCmAbewogE4H0C2BDADjALwwCyuUAFgHTq5gAmI2MAfDAAzUCsMA_DDDwA7mQIAeaOgCWYAOYAaOFBnzWACgCUMAFwwAro3gAzWfAYBuAFChIsBMlQYIxOEhRosefH2oBreABPCC1rK2MMGHVbaDdHTxgQYyiHD2cYXBcASSh4OgAjZBy8igxJFVk5dgAfAyNTIQZtatqAbQBdbQBvKwBfIA&debug=false&forceAllTransforms=false&shippedProposals=false&circleciRepo=&evaluate=false&fileSize=false&timeTravel=false&sourceType=module&lineWrap=true&presets=env%2Ctypescript&prettier=false&targets=&version=7.17.6&externalPlugins=&assumptions=%7B%7D
With:
/repl.ts: Property types[0] of UnionTypeAnnotation expected node to be of a type ["FlowType"] but instead got "TSUnionType"
Related: #9530 but it was already fixed, yet this error still occurs
💻
How are you using Babel?
Other (Next.js, Gatsby, vue-cli, ...)
Input code
Configuration file name
babel.config.js
Configuration
(
BUILD_TARGETis in this caseie11)Current and expected behavior
Current behavior:
babel prints this error and something (maybe parcel?) segfaults:
Expected behavior: types are stripped, transpilation succeeds and output code runs.
Environment
Possible solution
No response
Additional context
It also crashes the babel REPL:
https://babeljs.io/repl/#?browsers=IE%2011&build=&builtIns=false&corejs=3.6&spec=false&loose=false&code_lz=MYewdgzgLgBBCmAbewogE4H0C2BDADjALwwCyuUAFgHTq5gAmI2MAfDAAzUCsMA_DDDwA7mQIAeaOgCWYAOYAaOFBnzWACgCUMAFwwAro3gAzWfAYBuAFChIsBMlQYIxOEhRosefH2oBreABPCC1rK2MMGHVbaDdHTxgQYyiHD2cYXBcASSh4OgAjZBy8igxJFVk5dgAfAyNTIQZtatqAbQBdbQBvKwBfIA&debug=false&forceAllTransforms=false&shippedProposals=false&circleciRepo=&evaluate=false&fileSize=false&timeTravel=false&sourceType=module&lineWrap=true&presets=env%2Ctypescript&prettier=false&targets=&version=7.17.6&externalPlugins=&assumptions=%7B%7D
With:
Related: #9530 but it was already fixed, yet this error still occurs