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ahejlsbergahejlsberg
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Add regression test
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4 files changed

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‎tests/baselines/reference/nestedLoopTypeGuards.js

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//// [nestedLoopTypeGuards.ts]
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// Repros from #10378
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function f1() {
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var a: boolean | number | string;
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if (typeof a !== 'boolean') {
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// a is narrowed to "number | string"
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for (var i = 0; i < 1; i++) {
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for (var j = 0; j < 1; j++) {}
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if (typeof a === 'string') {
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// a is narrowed to "string'
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for (var j = 0; j < 1; j++) {
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a.length; // Should not error here
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}
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}
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}
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}
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}
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function f2() {
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var a: string | number;
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if (typeof a === 'string') {
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while (1) {
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while (1) {}
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if (typeof a === 'string') {
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while (1) {
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a.length; // Should not error here
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}
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}
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}
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}
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}
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//// [nestedLoopTypeGuards.js]
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// Repros from #10378
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function f1() {
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var a;
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if (typeof a !== 'boolean') {
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// a is narrowed to "number | string"
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for (var i = 0; i < 1; i++) {
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for (var j = 0; j < 1; j++) { }
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if (typeof a === 'string') {
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// a is narrowed to "string'
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for (var j = 0; j < 1; j++) {
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a.length; // Should not error here
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}
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}
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}
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}
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}
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function f2() {
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var a;
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if (typeof a === 'string') {
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while (1) {
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while (1) { }
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if (typeof a === 'string') {
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while (1) {
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a.length; // Should not error here
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}
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}
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}
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}
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}

‎tests/baselines/reference/nestedLoopTypeGuards.symbols

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=== tests/cases/compiler/nestedLoopTypeGuards.ts ===
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// Repros from #10378
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function f1() {
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>f1 : Symbol(f1, Decl(nestedLoopTypeGuards.ts, 0, 0))
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var a: boolean | number | string;
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>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 3, 7))
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if (typeof a !== 'boolean') {
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>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 3, 7))
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// a is narrowed to "number | string"
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for (var i = 0; i < 1; i++) {
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>i : Symbol(i, Decl(nestedLoopTypeGuards.ts, 6, 16))
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>i : Symbol(i, Decl(nestedLoopTypeGuards.ts, 6, 16))
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>i : Symbol(i, Decl(nestedLoopTypeGuards.ts, 6, 16))
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for (var j = 0; j < 1; j++) {}
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>j : Symbol(j, Decl(nestedLoopTypeGuards.ts, 7, 20), Decl(nestedLoopTypeGuards.ts, 10, 24))
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>j : Symbol(j, Decl(nestedLoopTypeGuards.ts, 7, 20), Decl(nestedLoopTypeGuards.ts, 10, 24))
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>j : Symbol(j, Decl(nestedLoopTypeGuards.ts, 7, 20), Decl(nestedLoopTypeGuards.ts, 10, 24))
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if (typeof a === 'string') {
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>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 3, 7))
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// a is narrowed to "string'
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for (var j = 0; j < 1; j++) {
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>j : Symbol(j, Decl(nestedLoopTypeGuards.ts, 7, 20), Decl(nestedLoopTypeGuards.ts, 10, 24))
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>j : Symbol(j, Decl(nestedLoopTypeGuards.ts, 7, 20), Decl(nestedLoopTypeGuards.ts, 10, 24))
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>j : Symbol(j, Decl(nestedLoopTypeGuards.ts, 7, 20), Decl(nestedLoopTypeGuards.ts, 10, 24))
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a.length; // Should not error here
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>a.length : Symbol(String.length, Decl(lib.d.ts, --, --))
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>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 3, 7))
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>length : Symbol(String.length, Decl(lib.d.ts, --, --))
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}
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}
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}
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}
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}
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function f2() {
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>f2 : Symbol(f2, Decl(nestedLoopTypeGuards.ts, 16, 1))
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var a: string | number;
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>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 19, 7))
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if (typeof a === 'string') {
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>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 19, 7))
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while (1) {
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while (1) {}
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if (typeof a === 'string') {
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>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 19, 7))
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while (1) {
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a.length; // Should not error here
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>a.length : Symbol(String.length, Decl(lib.d.ts, --, --))
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>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 19, 7))
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>length : Symbol(String.length, Decl(lib.d.ts, --, --))
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}
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}
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}
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}
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}

‎tests/baselines/reference/nestedLoopTypeGuards.types

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=== tests/cases/compiler/nestedLoopTypeGuards.ts ===
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// Repros from #10378
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function f1() {
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>f1 : () => void
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var a: boolean | number | string;
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>a : string | number | boolean
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if (typeof a !== 'boolean') {
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>typeof a !== 'boolean' : boolean
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>typeof a : string
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>a : string | number | boolean
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>'boolean' : "boolean"
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// a is narrowed to "number | string"
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for (var i = 0; i < 1; i++) {
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>i : number
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>0 : number
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>i < 1 : boolean
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>i : number
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>1 : number
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>i++ : number
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>i : number
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for (var j = 0; j < 1; j++) {}
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>j : number
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>0 : number
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>j < 1 : boolean
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>j : number
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>1 : number
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>j++ : number
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>j : number
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if (typeof a === 'string') {
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>typeof a === 'string' : boolean
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>typeof a : string
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>a : string | number
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>'string' : "string"
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// a is narrowed to "string'
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for (var j = 0; j < 1; j++) {
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>j : number
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>0 : number
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>j < 1 : boolean
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>j : number
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>1 : number
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>j++ : number
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>j : number
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a.length; // Should not error here
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>a.length : number
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>a : string
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>length : number
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}
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}
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}
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}
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}
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function f2() {
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>f2 : () => void
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var a: string | number;
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>a : string | number
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if (typeof a === 'string') {
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>typeof a === 'string' : boolean
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>typeof a : string
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>a : string | number
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>'string' : "string"
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while (1) {
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>1 : number
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while (1) {}
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>1 : number
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if (typeof a === 'string') {
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>typeof a === 'string' : boolean
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>typeof a : string
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>a : string
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>'string' : "string"
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while (1) {
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>1 : number
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a.length; // Should not error here
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>a.length : number
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>a : string
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>length : number
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}
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}
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}
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}
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}

‎tests/cases/compiler/nestedLoopTypeGuards.ts

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// Repros from #10378
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function f1() {
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var a: boolean | number | string;
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if (typeof a !== 'boolean') {
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// a is narrowed to "number | string"
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for (var i = 0; i < 1; i++) {
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for (var j = 0; j < 1; j++) {}
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if (typeof a === 'string') {
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// a is narrowed to "string'
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for (var j = 0; j < 1; j++) {
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a.length; // Should not error here
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}
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}
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}
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}
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}
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function f2() {
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var a: string | number;
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if (typeof a === 'string') {
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while (1) {
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while (1) {}
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if (typeof a === 'string') {
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while (1) {
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a.length; // Should not error here
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}
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}
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}
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}
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}

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