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Merged
merged 2 commits into from
Sep 30, 2020
Merged

Enforce a size limit in getSpreadType #40755

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6650496
Enforce a size limit in getSpreadType
amcasey Sep 24, 2020
9f5310f
Use the existing checkCrossProductUnion helper
amcasey Sep 25, 2020
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9 changes: 7 additions & 2 deletions src/compiler/checker.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -13394,6 +13394,7 @@ namespace ts {
function checkCrossProductUnion(types: readonly Type[]) {
const size = reduceLeft(types, (n, t) => n * (t.flags & TypeFlags.Union ? (<UnionType>t).types.length : t.flags & TypeFlags.Never ? 0 : 1), 1);
if (size >= 100000) {
tracing.instant(tracing.Phase.Check, "checkCrossProductUnion_DepthLimit", { typeIds: types.map(t => t.id), size });
error(currentNode, Diagnostics.Expression_produces_a_union_type_that_is_too_complex_to_represent);
return false;
}
Expand Down Expand Up @@ -14458,14 +14459,18 @@ namespace ts {
if (merged) {
return getSpreadType(merged, right, symbol, objectFlags, readonly);
}
return mapType(left, t => getSpreadType(t, right, symbol, objectFlags, readonly));
return checkCrossProductUnion([left, right])
? mapType(left, t => getSpreadType(t, right, symbol, objectFlags, readonly))
: errorType;
}
if (right.flags & TypeFlags.Union) {
const merged = tryMergeUnionOfObjectTypeAndEmptyObject(right as UnionType, readonly);
if (merged) {
return getSpreadType(left, merged, symbol, objectFlags, readonly);
}
return mapType(right, t => getSpreadType(left, t, symbol, objectFlags, readonly));
return checkCrossProductUnion([left, right])
? mapType(right, t => getSpreadType(left, t, symbol, objectFlags, readonly))
: errorType;
}
if (right.flags & (TypeFlags.BooleanLike | TypeFlags.NumberLike | TypeFlags.BigIntLike | TypeFlags.StringLike | TypeFlags.EnumLike | TypeFlags.NonPrimitive | TypeFlags.Index)) {
return left;
Expand Down
170 changes: 170 additions & 0 deletions tests/baselines/reference/objectSpreadRepeatedComplexity.errors.txt
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@@ -0,0 +1,170 @@
tests/cases/conformance/types/spread/objectSpreadRepeatedComplexity.ts(3,12): error TS2590: Expression produces a union type that is too complex to represent.


==== tests/cases/conformance/types/spread/objectSpreadRepeatedComplexity.ts (1 errors) ====
function f(cnd: Record<number, boolean>){
// Type is a union of 2^(n-1) members, where n is the number of spread objects
return {
~
// Without this one, it collapses to {} ?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
...(cnd[1] &&
~~~~~~~~~~~~~~~~~~~~~
cnd[2] && {
~~~~~~~~~~~~~~~~~~~~~~~
prop0: 0,
~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~


// With one prop each, it collapses to a single object (#34853?)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
...(cnd[3] && {
~~~~~~~~~~~~~~~~~~~~~~~
prop3a: 1,
~~~~~~~~~~~~~~~~~~~~~~
prop3b: 1,
~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[4] && {
~~~~~~~~~~~~~~~~~~~~~~~
prop4a: 1,
~~~~~~~~~~~~~~~~~~~~~~
prop4b: 1,
~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[5] && {
~~~~~~~~~~~~~~~~~~~~~~~
prop5a: 1,
~~~~~~~~~~~~~~~~~~~~~~
prop5b: 1,
~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[6] && {
~~~~~~~~~~~~~~~~~~~~~~~
prop6a: 1,
~~~~~~~~~~~~~~~~~~~~~~
prop6b: 1,
~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[7] && {
~~~~~~~~~~~~~~~~~~~~~~~
prop7a: 1,
~~~~~~~~~~~~~~~~~~~~~~
prop7b: 1,
~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[8] && {
~~~~~~~~~~~~~~~~~~~~~~~
prop8a: 1,
~~~~~~~~~~~~~~~~~~~~~~
prop8b: 1,
~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[9] && {
~~~~~~~~~~~~~~~~~~~~~~~
prop9a: 1,
~~~~~~~~~~~~~~~~~~~~~~
prop9b: 1,
~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[10] && {
~~~~~~~~~~~~~~~~~~~~~~~~
prop10a: 1,
~~~~~~~~~~~~~~~~~~~~~~~
prop10b: 1,
~~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[11] && {
~~~~~~~~~~~~~~~~~~~~~~~~
prop11a: 1,
~~~~~~~~~~~~~~~~~~~~~~~
prop11b: 1,
~~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[12] && {
~~~~~~~~~~~~~~~~~~~~~~~~
prop12a: 1,
~~~~~~~~~~~~~~~~~~~~~~~
prop12b: 1,
~~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[13] && {
~~~~~~~~~~~~~~~~~~~~~~~~
prop13a: 1,
~~~~~~~~~~~~~~~~~~~~~~~
prop13b: 1,
~~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[14] && {
~~~~~~~~~~~~~~~~~~~~~~~~
prop14a: 1,
~~~~~~~~~~~~~~~~~~~~~~~
prop14b: 1,
~~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[15] && {
~~~~~~~~~~~~~~~~~~~~~~~~
prop15a: 1,
~~~~~~~~~~~~~~~~~~~~~~~
prop15b: 1,
~~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[16] && {
~~~~~~~~~~~~~~~~~~~~~~~~
prop16a: 1,
~~~~~~~~~~~~~~~~~~~~~~~
prop16b: 1,
~~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[17] && {
~~~~~~~~~~~~~~~~~~~~~~~~
prop17a: 1,
~~~~~~~~~~~~~~~~~~~~~~~
prop17b: 1,
~~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[18] && {
~~~~~~~~~~~~~~~~~~~~~~~~
prop18a: 1,
~~~~~~~~~~~~~~~~~~~~~~~
prop18b: 1,
~~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[19] && {
~~~~~~~~~~~~~~~~~~~~~~~~
prop19a: 1,
~~~~~~~~~~~~~~~~~~~~~~~
prop19b: 1,
~~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
...(cnd[20] && {
~~~~~~~~~~~~~~~~~~~~~~~~
prop20a: 1,
~~~~~~~~~~~~~~~~~~~~~~~
prop20b: 1,
~~~~~~~~~~~~~~~~~~~~~~~
}),
~~~~~~~~~~~
};
~~~~~
!!! error TS2590: Expression produces a union type that is too complex to represent.
}
160 changes: 160 additions & 0 deletions tests/baselines/reference/objectSpreadRepeatedComplexity.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,160 @@
//// [objectSpreadRepeatedComplexity.ts]
function f(cnd: Record<number, boolean>){
// Type is a union of 2^(n-1) members, where n is the number of spread objects
return {
// Without this one, it collapses to {} ?
...(cnd[1] &&
cnd[2] && {
prop0: 0,
}),

// With one prop each, it collapses to a single object (#34853?)
...(cnd[3] && {
prop3a: 1,
prop3b: 1,
}),
...(cnd[4] && {
prop4a: 1,
prop4b: 1,
}),
...(cnd[5] && {
prop5a: 1,
prop5b: 1,
}),
...(cnd[6] && {
prop6a: 1,
prop6b: 1,
}),
...(cnd[7] && {
prop7a: 1,
prop7b: 1,
}),
...(cnd[8] && {
prop8a: 1,
prop8b: 1,
}),
...(cnd[9] && {
prop9a: 1,
prop9b: 1,
}),
...(cnd[10] && {
prop10a: 1,
prop10b: 1,
}),
...(cnd[11] && {
prop11a: 1,
prop11b: 1,
}),
...(cnd[12] && {
prop12a: 1,
prop12b: 1,
}),
...(cnd[13] && {
prop13a: 1,
prop13b: 1,
}),
...(cnd[14] && {
prop14a: 1,
prop14b: 1,
}),
...(cnd[15] && {
prop15a: 1,
prop15b: 1,
}),
...(cnd[16] && {
prop16a: 1,
prop16b: 1,
}),
...(cnd[17] && {
prop17a: 1,
prop17b: 1,
}),
...(cnd[18] && {
prop18a: 1,
prop18b: 1,
}),
...(cnd[19] && {
prop19a: 1,
prop19b: 1,
}),
...(cnd[20] && {
prop20a: 1,
prop20b: 1,
}),
};
}

//// [objectSpreadRepeatedComplexity.js]
"use strict";
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};
function f(cnd) {
// Type is a union of 2^(n-1) members, where n is the number of spread objects
return __assign(__assign(__assign(__assign(__assign(__assign(__assign(__assign(__assign(__assign(__assign(__assign(__assign(__assign(__assign(__assign(__assign(__assign(__assign({}, (cnd[1] &&
cnd[2] && {
prop0: 0
})), (cnd[3] && {
prop3a: 1,
prop3b: 1
})), (cnd[4] && {
prop4a: 1,
prop4b: 1
})), (cnd[5] && {
prop5a: 1,
prop5b: 1
})), (cnd[6] && {
prop6a: 1,
prop6b: 1
})), (cnd[7] && {
prop7a: 1,
prop7b: 1
})), (cnd[8] && {
prop8a: 1,
prop8b: 1
})), (cnd[9] && {
prop9a: 1,
prop9b: 1
})), (cnd[10] && {
prop10a: 1,
prop10b: 1
})), (cnd[11] && {
prop11a: 1,
prop11b: 1
})), (cnd[12] && {
prop12a: 1,
prop12b: 1
})), (cnd[13] && {
prop13a: 1,
prop13b: 1
})), (cnd[14] && {
prop14a: 1,
prop14b: 1
})), (cnd[15] && {
prop15a: 1,
prop15b: 1
})), (cnd[16] && {
prop16a: 1,
prop16b: 1
})), (cnd[17] && {
prop17a: 1,
prop17b: 1
})), (cnd[18] && {
prop18a: 1,
prop18b: 1
})), (cnd[19] && {
prop19a: 1,
prop19b: 1
})), (cnd[20] && {
prop20a: 1,
prop20b: 1
}));
}
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