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Fix merging of JS value & TS type decl #38936

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Merged
merged 1 commit into from
Jun 4, 2020
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Fix merging of JS value & TS type decl #38936

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2 changes: 1 addition & 1 deletion src/compiler/checker.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -7870,7 +7870,7 @@ namespace ts {
(resolvedSymbol || symbol).exports!.forEach((s, name) => {
const exportedMember = members.get(name)!;
if (exportedMember && exportedMember !== s) {
if (s.flags & SymbolFlags.Value) {
if (s.flags & SymbolFlags.Value && exportedMember.flags & SymbolFlags.Value) {
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@weswigham @sandersn when I was looking at this with Eli, this brought up a question as to why/how exportedType (defined a few lines above—the type of require('./y.js') in the test case) could have non-value members. In resolveAnonymousTypeMembers, it copies the exports of the symbol to the type, but of course, the exports of the .d.ts module includes a type symbol. It was surprising to me that resolveStructuredTypeMembers can return an anonymous object type that has members that are also types. Is that normal?

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normal-ish -- it can easily happen when you merge a type-only namespace with an object literal:

var o = { x: 1 }
namespace o { export type y = number }

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I realized I was confusing anonymous type members with anonymous type properties, which are guaranteed to be values. With that confusion cleared up, this fix definitely looks correct. The possibility of type members was simply overlooked in the past.

// If the member has an additional value-like declaration, union the types from the two declarations,
// but issue an error if they occurred in two different files. The purpose is to support a JS file with
// a pattern like:
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19 changes: 19 additions & 0 deletions tests/baselines/reference/jsExportMemberMergedWithModuleAugmentation3.symbols
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Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
=== /x.js ===
module.exports.x = 1;
>module.exports.x : Symbol(x, Decl(x.js, 0, 0), Decl(y.d.ts, 0, 0))
>module.exports : Symbol(x, Decl(x.js, 0, 0), Decl(y.d.ts, 0, 0))
>module : Symbol(module, Decl(x.js, 0, 0))
>exports : Symbol("/x", Decl(x.js, 0, 0))
>x : Symbol(x, Decl(x.js, 0, 0), Decl(y.d.ts, 0, 0))

module.exports = require("./y.js");
>module.exports : Symbol("/x", Decl(x.js, 0, 0))
>module : Symbol(export=, Decl(x.js, 0, 21))
>exports : Symbol(export=, Decl(x.js, 0, 21))
>require : Symbol(require)
>"./y.js" : Symbol("/y", Decl(y.d.ts, 0, 0))

=== /y.d.ts ===
export declare type x = 1;
>x : Symbol(x, Decl(x.js, 0, 0), Decl(y.d.ts, 0, 0))

23 changes: 23 additions & 0 deletions tests/baselines/reference/jsExportMemberMergedWithModuleAugmentation3.types
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@@ -0,0 +1,23 @@
=== /x.js ===
module.exports.x = 1;
>module.exports.x = 1 : 1
>module.exports.x : number
>module.exports : typeof import("/y")
>module : { "\"/x\"": typeof import("/y"); }
>exports : typeof import("/y")
>x : number
>1 : 1

module.exports = require("./y.js");
>module.exports = require("./y.js") : typeof import("/y")
>module.exports : typeof import("/y")
>module : { "\"/x\"": typeof import("/y"); }
>exports : typeof import("/y")
>require("./y.js") : typeof import("/y")
>require : any
>"./y.js" : "./y.js"

=== /y.d.ts ===
export declare type x = 1;
>x : 1

10 changes: 10 additions & 0 deletions tests/cases/compiler/jsExportMemberMergedWithModuleAugmentation3.ts
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@@ -0,0 +1,10 @@
// @allowJs: true
// @checkJs: true
// @noEmit: true

// @Filename: /x.js
module.exports.x = 1;
module.exports = require("./y.js");

// @Filename: /y.d.ts
export declare type x = 1;