fix: accept duplicated import/variable in different module

packages/babel-traverse/src/scope/index.ts

@@ -202,6 +202,9 @@ const collectorVisitor: Visitor<CollectVisitorState> = {
     // delegate block scope handling to the `BlockScoped` method
     if (path.isBlockScoped()) return;
 
+    // import handing to the `ImportDeclaration` method
+    if (path.isImportDeclaration()) return;
+
     // this will be hit again once we traverse into it after this iteration
     if (path.isExportDeclaration()) return;
 
@@ -211,6 +214,13 @@ const collectorVisitor: Visitor<CollectVisitorState> = {
     parent.registerDeclaration(path);
   },
 
+  ImportDeclaration(path) {
+    // import may only appear in the top level or inside a module/namespace (for TS/flow)
+    const parent = path.scope.getBlockParent();
+
+    parent.registerDeclaration(path);
+  },
+
   ReferencedIdentifier(path, state) {
     state.references.push(path);
   },

packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-flow/input.js

@@ -0,0 +1,18 @@
+// @flow
+
+type T = string;
+declare module 'test' {
+  import type { JSONSchema7 } from 'json-schema';
+  declare var a: number;
+  declare function foo(a: JSONSchema7): string;
+  declare export function concatPath(dirA: string, dirB: T): string;
+  declare export class A {}
+}
+
+declare module 'test/submodule' {
+  import type { JSONSchema7 } from 'json-schema';
+  declare var a: number;
+  declare function foo(a: JSONSchema7): string;
+  declare export function concatPath(dirA: string, dirB: string): string;
+  declare export class A {}
+}

packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-flow/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["syntax-flow"]
+}

packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-flow/output.js

@@ -0,0 +1,16 @@
+// @flow
+type T = string;
+declare module 'test' {
+  import type { JSONSchema7 } from 'json-schema';
+  declare var a: number;
+  declare function foo(a: JSONSchema7): string;
+  declare export function concatPath(dirA: string, dirB: T): string;
+  declare export class A {}
+}
+declare module 'test/submodule' {
+  import type { JSONSchema7 } from 'json-schema';
+  declare var a: number;
+  declare function foo(a: JSONSchema7): string;
+  declare export function concatPath(dirA: string, dirB: string): string;
+  declare export class A {}
+}

packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-ts/input.ts

@@ -0,0 +1,16 @@
+type T = number;
+declare module 'test' {
+  import type { JSONSchema7 } from 'json-schema';
+  import { bar } from "baz";
+  export { fooBar } from "baz";
+  let foo: JSONSchema7;
+  // can reference type outsider module
+  let baz: T;
+}
+
+declare module 'test/submodule' {
+  import type { JSONSchema7 } from 'json-schema';
+  import { bar } from "baz";
+  export { fooBar } from "baz";
+  let foo: JSONSchema7;
+}

packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-ts/options.json

@@ -0,0 +1,4 @@
+{
+  "plugins": ["syntax-typescript"],
+  "sourceType": "module"
+}

packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-ts/output.mjs

@@ -0,0 +1,15 @@
+type T = number;
+declare module 'test' {
+  import type { JSONSchema7 } from 'json-schema';
+  import { bar } from "baz";
+  export { fooBar } from "baz";
+  let foo: JSONSchema7; // can reference type outsider module
+
+  let baz: T;
+}
+declare module 'test/submodule' {
+  import type { JSONSchema7 } from 'json-schema';
+  import { bar } from "baz";
+  export { fooBar } from "baz";
+  let foo: JSONSchema7;
+}