Closed
Description
TypeScript Version: 3.8.3
Search Terms:
Expected behavior:
broken
should have the same type as working
.
Actual behavior:
broken
has an added never[]
type.
Related Issues:
Code
const gotoThen = Promise.resolve(123);
const gotoCatch = Promise.reject();
// const working: Promise<number[]>
const working = Promise.all([
gotoThen
]).catch(() => [123]);
// const broken: Promise<never[] | number[]>
const broken = Promise.all([
gotoCatch
]).catch(() => [456]);
// Promise { [ 123 ] } Promise { [ 456 ] }
console.log(working, broken);
Output
"use strict";
const gotoThen = Promise.resolve(123);
const gotoCatch = Promise.reject();
// const working: Promise<number[]>
const working = Promise.all([
gotoThen
]).catch(() => [123]);
// const broken: Promise<never[] | number[]>
const broken = Promise.all([
gotoCatch
]).catch(() => [456]);
// Promise { [ 123 ] } Promise { [ 456 ] }
console.log(working, broken);
Compiler Options
{
"compilerOptions": {
"noImplicitAny": true,
"strictNullChecks": true,
"strictFunctionTypes": true,
"strictPropertyInitialization": true,
"strictBindCallApply": true,
"noImplicitThis": true,
"noImplicitReturns": true,
"useDefineForClassFields": false,
"alwaysStrict": true,
"allowUnreachableCode": false,
"allowUnusedLabels": false,
"downlevelIteration": false,
"noEmitHelpers": false,
"noLib": false,
"noStrictGenericChecks": false,
"noUnusedLocals": false,
"noUnusedParameters": false,
"esModuleInterop": true,
"preserveConstEnums": false,
"removeComments": false,
"skipLibCheck": false,
"checkJs": false,
"allowJs": false,
"declaration": true,
"experimentalDecorators": false,
"emitDecoratorMetadata": false,
"target": "ES2017",
"module": "ESNext"
}
}
Playground Link: Provided