diff --git a/packages/babel-traverse/src/scope/index.ts b/packages/babel-traverse/src/scope/index.ts
index 98c7bc6a38..c77a0b3e8a 100644
--- a/packages/babel-traverse/src/scope/index.ts
+++ b/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;
 
+    // delegate 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);
   },
diff --git a/packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-flow/input.js b/packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-flow/input.js
new file mode 100644
index 0000000000..2b62c754ba
--- /dev/null
+++ b/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 {}
+}
diff --git a/packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-flow/options.json b/packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-flow/options.json
new file mode 100644
index 0000000000..68e1a85e7d
--- /dev/null
+++ b/packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-flow/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": ["syntax-flow"]
+}
diff --git a/packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-flow/output.js b/packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-flow/output.js
new file mode 100644
index 0000000000..2c53a4cc67
--- /dev/null
+++ b/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 {}
+}
diff --git a/packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-ts/input.ts b/packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-ts/input.ts
new file mode 100644
index 0000000000..c592c6cb3e
--- /dev/null
+++ b/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;
+}
diff --git a/packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-ts/options.json b/packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-ts/options.json
new file mode 100644
index 0000000000..2e01a44685
--- /dev/null
+++ b/packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-ts/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": ["syntax-typescript"],
+  "sourceType": "module"
+}
diff --git a/packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-ts/output.mjs b/packages/babel-traverse/test/fixtures/regression/duplicate-variable-in-different-module-ts/output.mjs
new file mode 100644
index 0000000000..ef3bc38db9
--- /dev/null
+++ b/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;
+}