fix(paresr): do not report missing initializer error in ambient context (#6020)

closes #5958

crates/oxc_parser/src/js/declaration.rs

@@ -119,14 +119,17 @@ impl<'a> ParserImpl<'a> {
         let init =
             self.eat(Kind::Eq).then(|| self.parse_assignment_expression_or_higher()).transpose()?;
 
-        if init.is_none() && decl_ctx.parent == VariableDeclarationParent::Statement {
+        if init.is_none()
+            && !self.ctx.has_ambient()
+            && decl_ctx.parent == VariableDeclarationParent::Statement
+        {
             // LexicalBinding[In, Yield, Await] :
             //   BindingIdentifier[?Yield, ?Await] Initializer[?In, ?Yield, ?Await] opt
             //   BindingPattern[?Yield, ?Await] Initializer[?In, ?Yield, ?Await]
             // the grammar forbids `let []`, `let {}`
             if !matches!(id.kind, BindingPatternKind::BindingIdentifier(_)) {
                 self.error(diagnostics::invalid_destrucuring_declaration(id.span()));
-            } else if kind == VariableDeclarationKind::Const && !self.ctx.has_ambient() {
+            } else if kind == VariableDeclarationKind::Const {
                 // It is a Syntax Error if Initializer is not present and IsConstantDeclaration of the LexicalDeclaration containing this LexicalBinding is true.
                 self.error(diagnostics::missinginitializer_in_const(id.span()));
             }

tasks/coverage/snapshots/parser_typescript.snap

@@ -2,7 +2,7 @@ commit: a709f989
 
 parser_typescript Summary:
 AST Parsed     : 6469/6479 (99.85%)
-Positive Passed: 6456/6479 (99.65%)
+Positive Passed: 6458/6479 (99.68%)
 Negative Passed: 1226/5715 (21.45%)
 Expect Syntax Error: tasks/coverage/typescript/tests/cases/compiler/ClassDeclaration10.ts
 Expect Syntax Error: tasks/coverage/typescript/tests/cases/compiler/ClassDeclaration11.ts
@@ -4519,15 +4519,6 @@ Expect to Parse: tasks/coverage/typescript/tests/cases/compiler/elidedEmbeddedSt
     · ────
  24 │     const enum H {}
     ╰────
-Expect to Parse: tasks/coverage/typescript/tests/cases/compiler/moduleAugmentationNoNewNames.ts
-
-  × Missing initializer in destructuring declaration
-    ╭─[typescript/tests/cases/compiler/moduleAugmentationNoNewNames.ts:11:9]
- 10 │     let y: number, z: string;
- 11 │     let {a: x, b: x1}: {a: number, b: number};
-    ·         ─────────────────────────────────────
- 12 │     module Z {}
-    ╰────
 Expect to Parse: tasks/coverage/typescript/tests/cases/compiler/moduleResolutionWithExtensions_unexpected2.ts
 
   × Expected a semicolon or an implicit semicolon after a statement, but found none
@@ -4554,15 +4545,6 @@ Expect to Parse: tasks/coverage/typescript/tests/cases/compiler/moduleResolution
    ·    ▲
    ╰────
   help: Try insert a semicolon here
-Expect to Parse: tasks/coverage/typescript/tests/cases/compiler/newNamesInGlobalAugmentations1.ts
-
-  × Missing initializer in destructuring declaration
-    ╭─[typescript/tests/cases/compiler/newNamesInGlobalAugmentations1.ts:11:9]
- 10 │     class Cls {x}
- 11 │     let [a, b]: number[];
-    ·         ────────────────
- 12 │     export import X = M.M1.x;
-    ╰────
 Expect to Parse: tasks/coverage/typescript/tests/cases/compiler/sourceMapValidationDecorators.ts
 
   × Unexpected token

tasks/coverage/snapshots/semantic_typescript.snap

@@ -2,7 +2,7 @@ commit: a709f989
 
 semantic_typescript Summary:
 AST Parsed     : 6479/6479 (100.00%)
-Positive Passed: 2671/6479 (41.23%)
+Positive Passed: 2672/6479 (41.24%)
 tasks/coverage/typescript/tests/cases/compiler/2dArrays.ts
 semantic error: Symbol reference IDs mismatch:
 after transform: SymbolId(0): [ReferenceId(1)]
@@ -23132,8 +23132,7 @@ after transform: ScopeId(0): ["Observable", "x"]
 rebuilt        : ScopeId(0): ["x"]
 
 tasks/coverage/typescript/tests/cases/compiler/moduleAugmentationNoNewNames.ts
-semantic error: Missing initializer in destructuring declaration
+semantic error: Bindings mismatch:
-Bindings mismatch:
 after transform: ScopeId(0): ["./observable", "Observable"]
 rebuilt        : ScopeId(0): ["Observable"]
 Scope children mismatch:
@@ -24951,9 +24950,6 @@ Unresolved references mismatch:
 after transform: ["a"]
 rebuilt        : []
 
-tasks/coverage/typescript/tests/cases/compiler/newNamesInGlobalAugmentations1.ts
-semantic error: Missing initializer in destructuring declaration
-
 tasks/coverage/typescript/tests/cases/compiler/noAsConstNameLookup.ts
 semantic error: Bindings mismatch:
 after transform: ScopeId(0): ["C", "Cleaner", "FeatureRunner", "Store"]