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Fix non-toplevel prototype assignment (#27096)
* Fix non-toplevel prototype assignment binder was using the wrong node to lookup the containing class type for prototype assignment, so it incorrectly put the prototype declaration on the class' symbol. This correction to the binder in turn required a change in getJSClassType in the checker. It now has to look at the "prototype" property for the prototype instead of looking on the class symbol's exports (which makes no sense). * Refactor per PR suggestion
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6 files changed

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6 files changed

+382
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lines changed

‎src/compiler/binder.ts

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -2465,7 +2465,7 @@ namespace ts {
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node.left.parent = node;
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node.right.parent = node;
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const lhs = node.left as PropertyAccessEntityNameExpression;
2468-
bindPropertyAssignment(lhs, lhs, /*isPrototypeProperty*/ false);
2468+
bindPropertyAssignment(lhs.expression, lhs, /*isPrototypeProperty*/ false);
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}
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24712471
/**
@@ -2522,7 +2522,7 @@ namespace ts {
25222522
const isToplevel = isBinaryExpression(propertyAccess.parent)
25232523
? getParentOfBinaryExpression(propertyAccess.parent).parent.kind === SyntaxKind.SourceFile
25242524
: propertyAccess.parent.parent.kind === SyntaxKind.SourceFile;
2525-
if (!isPrototypeProperty && (!namespaceSymbol || !(namespaceSymbol.flags & SymbolFlags.Namespace)) && isToplevel) {
2525+
if (isToplevel && !isPrototypeProperty && (!namespaceSymbol || !(namespaceSymbol.flags & SymbolFlags.Namespace))) {
25262526
// make symbols or add declarations for intermediate containers
25272527
const flags = SymbolFlags.Module | SymbolFlags.Assignment;
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const excludeFlags = SymbolFlags.ValueModuleExcludes & ~SymbolFlags.Assignment;

‎src/compiler/checker.ts

Lines changed: 4 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -20203,18 +20203,15 @@ namespace ts {
2020320203
assigned || inferred;
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}
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20206-
function getAssignedClassType(symbol: Symbol) {
20206+
function getAssignedClassType(symbol: Symbol): Type | undefined {
2020720207
const decl = symbol.valueDeclaration;
2020820208
const assignmentSymbol = decl && decl.parent &&
2020920209
(isFunctionDeclaration(decl) && getSymbolOfNode(decl) ||
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isBinaryExpression(decl.parent) && getSymbolOfNode(decl.parent.left) ||
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isVariableDeclaration(decl.parent) && getSymbolOfNode(decl.parent));
20212-
if (assignmentSymbol) {
20213-
const prototype = forEach(assignmentSymbol.declarations, getAssignedJSPrototype);
20214-
if (prototype) {
20215-
return checkExpression(prototype);
20216-
}
20217-
}
20212+
const prototype = assignmentSymbol && assignmentSymbol.exports && assignmentSymbol.exports.get("prototype" as __String);
20213+
const init = prototype && getAssignedJSPrototype(prototype.valueDeclaration);
20214+
return init ? checkExpression(init) : undefined;
2021820215
}
2021920216

2022020217
function getAssignedJSPrototype(node: Node) {

‎tests/baselines/reference/typeFromPrototypeAssignment2.errors.txt

Lines changed: 47 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,47 @@
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tests/cases/conformance/salsa/a.js(28,24): error TS2339: Property 'addon' does not exist on type '{ set: () => void; get(): void; }'.
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==== tests/cases/conformance/salsa/a.js (1 errors) ====
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// non top-level:
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// all references to _map, set, get, addon should be ok
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(function container() {
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/** @constructor */
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var Multimap = function() {
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this._map = {};
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this._map
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this.set
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this.get
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this.addon
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};
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Multimap.prototype = {
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set: function() {
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this._map
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this.set
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this.get
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this.addon
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},
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get() {
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this._map
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this.set
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this.get
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this.addon
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}
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}
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Multimap.prototype.addon = function () {
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~~~~~
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!!! error TS2339: Property 'addon' does not exist on type '{ set: () => void; get(): void; }'.
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this._map
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this.set
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this.get
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this.addon
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}
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var mm = new Multimap();
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mm._map
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mm.set
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mm.get
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mm.addon
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});
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‎tests/baselines/reference/typeFromPrototypeAssignment2.symbols

Lines changed: 127 additions & 0 deletions
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@@ -0,0 +1,127 @@
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=== tests/cases/conformance/salsa/a.js ===
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// non top-level:
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// all references to _map, set, get, addon should be ok
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(function container() {
5+
>container : Symbol(container, Decl(a.js, 2, 1))
6+
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/** @constructor */
8+
var Multimap = function() {
9+
>Multimap : Symbol(Multimap, Decl(a.js, 4, 7))
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this._map = {};
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>this._map : Symbol(Multimap._map, Decl(a.js, 4, 31))
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>_map : Symbol(Multimap._map, Decl(a.js, 4, 31))
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this._map
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>this._map : Symbol(Multimap._map, Decl(a.js, 4, 31))
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>_map : Symbol(Multimap._map, Decl(a.js, 4, 31))
18+
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this.set
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>this.set : Symbol(set, Decl(a.js, 12, 26))
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>set : Symbol(set, Decl(a.js, 12, 26))
22+
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this.get
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>this.get : Symbol(get, Decl(a.js, 18, 10))
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>get : Symbol(get, Decl(a.js, 18, 10))
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this.addon
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>this.addon : Symbol(Multimap.addon, Decl(a.js, 25, 5))
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>addon : Symbol(Multimap.addon, Decl(a.js, 25, 5))
30+
31+
};
32+
33+
Multimap.prototype = {
34+
>Multimap.prototype : Symbol(Multimap.prototype, Decl(a.js, 10, 6))
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>Multimap : Symbol(Multimap, Decl(a.js, 4, 7))
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>prototype : Symbol(Multimap.prototype, Decl(a.js, 10, 6))
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set: function() {
39+
>set : Symbol(set, Decl(a.js, 12, 26))
40+
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this._map
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>this._map : Symbol(Multimap._map, Decl(a.js, 4, 31))
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>_map : Symbol(Multimap._map, Decl(a.js, 4, 31))
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this.set
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>this.set : Symbol(set, Decl(a.js, 12, 26))
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>set : Symbol(set, Decl(a.js, 12, 26))
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this.get
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>this.get : Symbol(get, Decl(a.js, 18, 10))
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>get : Symbol(get, Decl(a.js, 18, 10))
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this.addon
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>this.addon : Symbol(Multimap.addon, Decl(a.js, 25, 5))
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>addon : Symbol(Multimap.addon, Decl(a.js, 25, 5))
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},
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get() {
59+
>get : Symbol(get, Decl(a.js, 18, 10))
60+
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this._map
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>this._map : Symbol(Multimap._map, Decl(a.js, 4, 31))
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>_map : Symbol(Multimap._map, Decl(a.js, 4, 31))
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this.set
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>this.set : Symbol(set, Decl(a.js, 12, 26))
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>set : Symbol(set, Decl(a.js, 12, 26))
68+
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this.get
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>this.get : Symbol(get, Decl(a.js, 18, 10))
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>get : Symbol(get, Decl(a.js, 18, 10))
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this.addon
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>this.addon : Symbol(Multimap.addon, Decl(a.js, 25, 5))
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>addon : Symbol(Multimap.addon, Decl(a.js, 25, 5))
76+
}
77+
}
78+
79+
Multimap.prototype.addon = function () {
80+
>Multimap.prototype : Symbol(Multimap.addon, Decl(a.js, 25, 5))
81+
>Multimap : Symbol(Multimap, Decl(a.js, 4, 7))
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>prototype : Symbol(Multimap.prototype, Decl(a.js, 10, 6))
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>addon : Symbol(Multimap.addon, Decl(a.js, 25, 5))
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this._map
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>this._map : Symbol(Multimap._map, Decl(a.js, 4, 31))
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>_map : Symbol(Multimap._map, Decl(a.js, 4, 31))
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this.set
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>this.set : Symbol(set, Decl(a.js, 12, 26))
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>set : Symbol(set, Decl(a.js, 12, 26))
92+
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this.get
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>this.get : Symbol(get, Decl(a.js, 18, 10))
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>get : Symbol(get, Decl(a.js, 18, 10))
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this.addon
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>this.addon : Symbol(Multimap.addon, Decl(a.js, 25, 5))
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>addon : Symbol(Multimap.addon, Decl(a.js, 25, 5))
100+
}
101+
102+
var mm = new Multimap();
103+
>mm : Symbol(mm, Decl(a.js, 34, 7))
104+
>Multimap : Symbol(Multimap, Decl(a.js, 4, 7))
105+
106+
mm._map
107+
>mm._map : Symbol(Multimap._map, Decl(a.js, 4, 31))
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>mm : Symbol(mm, Decl(a.js, 34, 7))
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>_map : Symbol(Multimap._map, Decl(a.js, 4, 31))
110+
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mm.set
112+
>mm.set : Symbol(set, Decl(a.js, 12, 26))
113+
>mm : Symbol(mm, Decl(a.js, 34, 7))
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>set : Symbol(set, Decl(a.js, 12, 26))
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mm.get
117+
>mm.get : Symbol(get, Decl(a.js, 18, 10))
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>mm : Symbol(mm, Decl(a.js, 34, 7))
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>get : Symbol(get, Decl(a.js, 18, 10))
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121+
mm.addon
122+
>mm.addon : Symbol(Multimap.addon, Decl(a.js, 25, 5))
123+
>mm : Symbol(mm, Decl(a.js, 34, 7))
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>addon : Symbol(Multimap.addon, Decl(a.js, 25, 5))
125+
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});
127+

‎tests/baselines/reference/typeFromPrototypeAssignment2.types

Lines changed: 156 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,156 @@
1+
=== tests/cases/conformance/salsa/a.js ===
2+
// non top-level:
3+
// all references to _map, set, get, addon should be ok
4+
(function container() {
5+
>(function container() { /** @constructor */ var Multimap = function() { this._map = {}; this._map this.set this.get this.addon }; Multimap.prototype = { set: function() { this._map this.set this.get this.addon }, get() { this._map this.set this.get this.addon } } Multimap.prototype.addon = function () { this._map this.set this.get this.addon } var mm = new Multimap(); mm._map mm.set mm.get mm.addon}) : () => void
6+
>function container() { /** @constructor */ var Multimap = function() { this._map = {}; this._map this.set this.get this.addon }; Multimap.prototype = { set: function() { this._map this.set this.get this.addon }, get() { this._map this.set this.get this.addon } } Multimap.prototype.addon = function () { this._map this.set this.get this.addon } var mm = new Multimap(); mm._map mm.set mm.get mm.addon} : () => void
7+
>container : () => void
8+
9+
/** @constructor */
10+
var Multimap = function() {
11+
>Multimap : typeof Multimap
12+
>function() { this._map = {}; this._map this.set this.get this.addon } : typeof Multimap
13+
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this._map = {};
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>this._map = {} : {}
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>this._map : {}
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>this : Multimap & { set: () => void; get(): void; }
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>_map : {}
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>{} : {}
20+
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this._map
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>this._map : {}
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>this : Multimap & { set: () => void; get(): void; }
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>_map : {}
25+
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this.set
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>this.set : () => void
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>this : Multimap & { set: () => void; get(): void; }
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>set : () => void
30+
31+
this.get
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>this.get : () => void
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>this : Multimap & { set: () => void; get(): void; }
34+
>get : () => void
35+
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this.addon
37+
>this.addon : () => void
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>this : Multimap & { set: () => void; get(): void; }
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>addon : () => void
40+
41+
};
42+
43+
Multimap.prototype = {
44+
>Multimap.prototype = { set: function() { this._map this.set this.get this.addon }, get() { this._map this.set this.get this.addon } } : { set: () => void; get(): void; }
45+
>Multimap.prototype : { set: () => void; get(): void; }
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>Multimap : typeof Multimap
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>prototype : { set: () => void; get(): void; }
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>{ set: function() { this._map this.set this.get this.addon }, get() { this._map this.set this.get this.addon } } : { set: () => void; get(): void; }
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set: function() {
51+
>set : () => void
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>function() { this._map this.set this.get this.addon } : () => void
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this._map
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>this._map : {}
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>this : Multimap & { set: () => void; get(): void; }
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>_map : {}
58+
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this.set
60+
>this.set : () => void
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>this : Multimap & { set: () => void; get(): void; }
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>set : () => void
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this.get
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>this.get : () => void
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>this : Multimap & { set: () => void; get(): void; }
67+
>get : () => void
68+
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this.addon
70+
>this.addon : () => void
71+
>this : Multimap & { set: () => void; get(): void; }
72+
>addon : () => void
73+
74+
},
75+
get() {
76+
>get : () => void
77+
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this._map
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>this._map : {}
80+
>this : Multimap & { set: () => void; get(): void; }
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>_map : {}
82+
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this.set
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>this.set : () => void
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>this : Multimap & { set: () => void; get(): void; }
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>set : () => void
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this.get
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>this.get : () => void
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>this : Multimap & { set: () => void; get(): void; }
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>get : () => void
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this.addon
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>this.addon : () => void
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>this : Multimap & { set: () => void; get(): void; }
96+
>addon : () => void
97+
}
98+
}
99+
100+
Multimap.prototype.addon = function () {
101+
>Multimap.prototype.addon = function () { this._map this.set this.get this.addon } : () => void
102+
>Multimap.prototype.addon : any
103+
>Multimap.prototype : { set: () => void; get(): void; }
104+
>Multimap : typeof Multimap
105+
>prototype : { set: () => void; get(): void; }
106+
>addon : any
107+
>function () { this._map this.set this.get this.addon } : () => void
108+
109+
this._map
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>this._map : {}
111+
>this : Multimap & { set: () => void; get(): void; }
112+
>_map : {}
113+
114+
this.set
115+
>this.set : () => void
116+
>this : Multimap & { set: () => void; get(): void; }
117+
>set : () => void
118+
119+
this.get
120+
>this.get : () => void
121+
>this : Multimap & { set: () => void; get(): void; }
122+
>get : () => void
123+
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this.addon
125+
>this.addon : () => void
126+
>this : Multimap & { set: () => void; get(): void; }
127+
>addon : () => void
128+
}
129+
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var mm = new Multimap();
131+
>mm : Multimap & { set: () => void; get(): void; }
132+
>new Multimap() : Multimap & { set: () => void; get(): void; }
133+
>Multimap : typeof Multimap
134+
135+
mm._map
136+
>mm._map : {}
137+
>mm : Multimap & { set: () => void; get(): void; }
138+
>_map : {}
139+
140+
mm.set
141+
>mm.set : () => void
142+
>mm : Multimap & { set: () => void; get(): void; }
143+
>set : () => void
144+
145+
mm.get
146+
>mm.get : () => void
147+
>mm : Multimap & { set: () => void; get(): void; }
148+
>get : () => void
149+
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mm.addon
151+
>mm.addon : () => void
152+
>mm : Multimap & { set: () => void; get(): void; }
153+
>addon : () => void
154+
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});
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