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Do not consider element accesses which are neither statically bindable nor late bound as special assignments #34679

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Merged
Wesley Wigham (weswigham) merged 1 commit into from
Oct 23, 2019
Merged

Do not consider element accesses which are neither statically bindable nor late bound as special assignments #34679

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8 changes: 5 additions & 3 deletions src/compiler/utilities.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -2115,7 +2115,7 @@ namespace ts {
if (expr.operatorToken.kind !== SyntaxKind.EqualsToken || !isAccessExpression(expr.left)) {
return AssignmentDeclarationKind.None;
}
if (isBindableStaticNameExpression(expr.left.expression) && getElementOrPropertyAccessName(expr.left) === "prototype" && isObjectLiteralExpression(getInitializerOfBinaryExpression(expr))) {
if (isBindableStaticNameExpression(expr.left.expression, /*excludeThisKeyword*/ true) && getElementOrPropertyAccessName(expr.left) === "prototype" && isObjectLiteralExpression(getInitializerOfBinaryExpression(expr))) {
// F.prototype = { ... }
return AssignmentDeclarationKind.Prototype;
}
Expand Down Expand Up @@ -2183,8 +2183,10 @@ namespace ts {
// exports.name = expr OR module.exports.name = expr OR exports["name"] = expr ...
return AssignmentDeclarationKind.ExportsProperty;
}
// F.G...x = expr
return AssignmentDeclarationKind.Property;
if (isBindableStaticNameExpression(lhs, /*excludeThisKeyword*/ true) || (isElementAccessExpression(lhs) && isDynamicName(lhs) && lhs.expression.kind !== SyntaxKind.ThisKeyword)) {
// F.G...x = expr
return AssignmentDeclarationKind.Property;
}
}

return AssignmentDeclarationKind.None;
Expand Down
7 changes: 7 additions & 0 deletions tests/baselines/reference/jsNegativeElementAccessNotBound.symbols
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@@ -0,0 +1,7 @@
=== tests/cases/compiler/jsNegativeELementAccessNotBound.js ===
var indexMap = {};
>indexMap : Symbol(indexMap, Decl(jsNegativeELementAccessNotBound.js, 0, 3))

indexMap[-1] = 0;
>indexMap : Symbol(indexMap, Decl(jsNegativeELementAccessNotBound.js, 0, 3))

13 changes: 13 additions & 0 deletions tests/baselines/reference/jsNegativeElementAccessNotBound.types
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@@ -0,0 +1,13 @@
=== tests/cases/compiler/jsNegativeELementAccessNotBound.js ===
var indexMap = {};
>indexMap : {}
>{} : {}

indexMap[-1] = 0;
>indexMap[-1] = 0 : 0
>indexMap[-1] : any
>indexMap : {}
>-1 : -1
>1 : 1
>0 : 0

6 changes: 6 additions & 0 deletions tests/cases/compiler/jsNegativeElementAccessNotBound.ts
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@@ -0,0 +1,6 @@
// @allowJs: true
// @checkJs: true
// @noEmit: true
// @filename: jsNegativeELementAccessNotBound.js
var indexMap = {};
indexMap[-1] = 0;