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Fix nested loop type guards #10396

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Merged
ahejlsberg merged 2 commits into from
Aug 17, 2016
Merged

Fix nested loop type guards #10396

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2d1639f
Property handle imcomplete control flow types in nested loops
ahejlsberg Aug 17, 2016
b93cdec
Add regression test
ahejlsberg Aug 17, 2016
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Add regression test
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@ahejlsberg
ahejlsberg committed Aug 17, 2016
commit b93cdecdf5165ad0b569ca9a6b9d54626b4855b6
63 changes: 63 additions & 0 deletions tests/baselines/reference/nestedLoopTypeGuards.js
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//// [nestedLoopTypeGuards.ts]
// Repros from #10378

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

function f2() {
var a: string | number;
if (typeof a === 'string') {
while (1) {
while (1) {}
if (typeof a === 'string') {
while (1) {
a.length; // Should not error here
}
}
}
}
}

//// [nestedLoopTypeGuards.js]
// Repros from #10378
function f1() {
var a;
if (typeof a !== 'boolean') {
// a is narrowed to "number | string"
for (var i = 0; i < 1; i++) {
for (var j = 0; j < 1; j++) { }
if (typeof a === 'string') {
// a is narrowed to "string'
for (var j = 0; j < 1; j++) {
a.length; // Should not error here
}
}
}
}
}
function f2() {
var a;
if (typeof a === 'string') {
while (1) {
while (1) { }
if (typeof a === 'string') {
while (1) {
a.length; // Should not error here
}
}
}
}
}
66 changes: 66 additions & 0 deletions tests/baselines/reference/nestedLoopTypeGuards.symbols
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Original file line number Diff line number Diff line change
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=== tests/cases/compiler/nestedLoopTypeGuards.ts ===
// Repros from #10378

function f1() {
>f1 : Symbol(f1, Decl(nestedLoopTypeGuards.ts, 0, 0))

var a: boolean | number | string;
>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 3, 7))

if (typeof a !== 'boolean') {
>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 3, 7))

// a is narrowed to "number | string"
for (var i = 0; i < 1; i++) {
>i : Symbol(i, Decl(nestedLoopTypeGuards.ts, 6, 16))
>i : Symbol(i, Decl(nestedLoopTypeGuards.ts, 6, 16))
>i : Symbol(i, Decl(nestedLoopTypeGuards.ts, 6, 16))

for (var j = 0; j < 1; j++) {}
>j : Symbol(j, Decl(nestedLoopTypeGuards.ts, 7, 20), Decl(nestedLoopTypeGuards.ts, 10, 24))
>j : Symbol(j, Decl(nestedLoopTypeGuards.ts, 7, 20), Decl(nestedLoopTypeGuards.ts, 10, 24))
>j : Symbol(j, Decl(nestedLoopTypeGuards.ts, 7, 20), Decl(nestedLoopTypeGuards.ts, 10, 24))

if (typeof a === 'string') {
>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 3, 7))

// a is narrowed to "string'
for (var j = 0; j < 1; j++) {
>j : Symbol(j, Decl(nestedLoopTypeGuards.ts, 7, 20), Decl(nestedLoopTypeGuards.ts, 10, 24))
>j : Symbol(j, Decl(nestedLoopTypeGuards.ts, 7, 20), Decl(nestedLoopTypeGuards.ts, 10, 24))
>j : Symbol(j, Decl(nestedLoopTypeGuards.ts, 7, 20), Decl(nestedLoopTypeGuards.ts, 10, 24))

a.length; // Should not error here
>a.length : Symbol(String.length, Decl(lib.d.ts, --, --))
>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 3, 7))
>length : Symbol(String.length, Decl(lib.d.ts, --, --))
}
}
}
}
}

function f2() {
>f2 : Symbol(f2, Decl(nestedLoopTypeGuards.ts, 16, 1))

var a: string | number;
>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 19, 7))

if (typeof a === 'string') {
>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 19, 7))

while (1) {
while (1) {}
if (typeof a === 'string') {
>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 19, 7))

while (1) {
a.length; // Should not error here
>a.length : Symbol(String.length, Decl(lib.d.ts, --, --))
>a : Symbol(a, Decl(nestedLoopTypeGuards.ts, 19, 7))
>length : Symbol(String.length, Decl(lib.d.ts, --, --))
}
}
}
}
}
96 changes: 96 additions & 0 deletions tests/baselines/reference/nestedLoopTypeGuards.types
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@@ -0,0 +1,96 @@
=== tests/cases/compiler/nestedLoopTypeGuards.ts ===
// Repros from #10378

function f1() {
>f1 : () => void

var a: boolean | number | string;
>a : string | number | boolean

if (typeof a !== 'boolean') {
>typeof a !== 'boolean' : boolean
>typeof a : string
>a : string | number | boolean
>'boolean' : "boolean"

// a is narrowed to "number | string"
for (var i = 0; i < 1; i++) {
>i : number
>0 : number
>i < 1 : boolean
>i : number
>1 : number
>i++ : number
>i : number

for (var j = 0; j < 1; j++) {}
>j : number
>0 : number
>j < 1 : boolean
>j : number
>1 : number
>j++ : number
>j : number

if (typeof a === 'string') {
>typeof a === 'string' : boolean
>typeof a : string
>a : string | number
>'string' : "string"

// a is narrowed to "string'
for (var j = 0; j < 1; j++) {
>j : number
>0 : number
>j < 1 : boolean
>j : number
>1 : number
>j++ : number
>j : number

a.length; // Should not error here
>a.length : number
>a : string
>length : number
}
}
}
}
}

function f2() {
>f2 : () => void

var a: string | number;
>a : string | number

if (typeof a === 'string') {
>typeof a === 'string' : boolean
>typeof a : string
>a : string | number
>'string' : "string"

while (1) {
>1 : number

while (1) {}
>1 : number

if (typeof a === 'string') {
>typeof a === 'string' : boolean
>typeof a : string
>a : string
>'string' : "string"

while (1) {
>1 : number

a.length; // Should not error here
>a.length : number
>a : string
>length : number
}
}
}
}
}
31 changes: 31 additions & 0 deletions tests/cases/compiler/nestedLoopTypeGuards.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,31 @@
// Repros from #10378

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

function f2() {
var a: string | number;
if (typeof a === 'string') {
while (1) {
while (1) {}
if (typeof a === 'string') {
while (1) {
a.length; // Should not error here
}
}
}
}
}