feat(transformer): add defaulted Module::Preserve option (#7225)

crates/oxc_transformer/src/options/module.rs

@@ -15,6 +15,7 @@ use crate::options::babel::BabelModule;
 #[non_exhaustive]
 pub enum Module {
     #[default]
+    Preserve,
     ESM,
     CommonJS,
 }
@@ -36,7 +37,7 @@ impl TryFrom<BabelModule> for Module {
     fn try_from(value: BabelModule) -> Result<Self, Self::Error> {
         match value {
             BabelModule::Commonjs => Ok(Self::CommonJS),
-            BabelModule::Auto | BabelModule::Boolean(false) => Ok(Self::ESM),
+            BabelModule::Auto | BabelModule::Boolean(false) => Ok(Self::Preserve),
             _ => Err(Error::msg(format!("{value:?} module is not implemented."))),
         }
     }

napi/transform/test/transform.test.ts

@@ -31,6 +31,25 @@ describe('transform', () => {
   });
 });
 
+describe('modules', () => {
+  it('should transform export = and import ', () => {
+    const code = `
+export = function foo (): void {}
+import bar = require('bar')
+`;
+    const ret = oxc.transform('test.ts', code, {
+      typescript: {
+        declaration: true,
+      },
+    });
+    assert.deepEqual(ret, {
+      code: 'module.exports = function foo() {};\nconst bar = require("bar");\n',
+      declaration: 'declare const _default: () => void;\nexport = _default;\n',
+      errors: [],
+    });
+  });
+});
+
 describe('react refresh plugin', () => {
   const code = `import { useState } from "react";
   export const App = () => {

tasks/coverage/snapshots/semantic_babel.snap

@@ -423,7 +423,14 @@ after transform: ["Y", "foo"]
 rebuilt        : []
 
 tasks/coverage/babel/packages/babel-parser/test/fixtures/estree/typescript/import-require/input.js
-semantic error: Import assignment cannot be used when targeting ECMAScript modules.
+semantic error: Missing SymbolId: "x"
+Missing ReferenceId: "require"
+Binding symbols mismatch:
+after transform: ScopeId(0): [SymbolId(0)]
+rebuilt        : ScopeId(0): [SymbolId(0)]
+Unresolved references mismatch:
+after transform: []
+rebuilt        : ["require"]
 
 tasks/coverage/babel/packages/babel-parser/test/fixtures/estree/typescript/literals/input.js
 semantic error: Bindings mismatch:
@@ -1100,10 +1107,14 @@ after transform: ScopeId(0): [ScopeId(1), ScopeId(2), ScopeId(3), ScopeId(4), Sc
 rebuilt        : ScopeId(0): []
 
 tasks/coverage/babel/packages/babel-parser/test/fixtures/typescript/export/equals/input.ts
-semantic error: Export assignment cannot be used when targeting ECMAScript modules.
+semantic error: Reference flags mismatch for "f":
+after transform: ReferenceId(0): ReferenceFlags(Read | Type)
+rebuilt        : ReferenceId(1): ReferenceFlags(Read)
 
 tasks/coverage/babel/packages/babel-parser/test/fixtures/typescript/export/equals-in-unambiguous/input.ts
-semantic error: Export assignment cannot be used when targeting ECMAScript modules.
+semantic error: Reference flags mismatch for "f":
+after transform: ReferenceId(0): ReferenceFlags(Read | Type)
+rebuilt        : ReferenceId(1): ReferenceFlags(Read)
 
 tasks/coverage/babel/packages/babel-parser/test/fixtures/typescript/export/export-type/input.ts
 semantic error: Bindings mismatch:
@@ -1223,10 +1234,24 @@ after transform: ScopeId(0): [SymbolId(0)]
 rebuilt        : ScopeId(0): [SymbolId(0)]
 
 tasks/coverage/babel/packages/babel-parser/test/fixtures/typescript/import/equals-require/input.ts
-semantic error: Import assignment cannot be used when targeting ECMAScript modules.
+semantic error: Missing SymbolId: "a"
+Missing ReferenceId: "require"
+Binding symbols mismatch:
+after transform: ScopeId(0): [SymbolId(0)]
+rebuilt        : ScopeId(0): [SymbolId(0)]
+Unresolved references mismatch:
+after transform: []
+rebuilt        : ["require"]
 
 tasks/coverage/babel/packages/babel-parser/test/fixtures/typescript/import/equals-require-in-unambiguous/input.ts
-semantic error: Import assignment cannot be used when targeting ECMAScript modules.
+semantic error: Missing SymbolId: "a"
+Missing ReferenceId: "require"
+Binding symbols mismatch:
+after transform: ScopeId(0): [SymbolId(0)]
+rebuilt        : ScopeId(0): [SymbolId(0)]
+Unresolved references mismatch:
+after transform: []
+rebuilt        : ["require"]
 
 tasks/coverage/babel/packages/babel-parser/test/fixtures/typescript/import/export-import/input.ts
 semantic error: Missing SymbolId: "A"
@@ -1235,10 +1260,24 @@ after transform: ScopeId(0): [SymbolId(0)]
 rebuilt        : ScopeId(0): [SymbolId(0)]
 
 tasks/coverage/babel/packages/babel-parser/test/fixtures/typescript/import/export-import-require/input.ts
-semantic error: Import assignment cannot be used when targeting ECMAScript modules.
+semantic error: Missing SymbolId: "a"
+Missing ReferenceId: "require"
+Binding symbols mismatch:
+after transform: ScopeId(0): [SymbolId(0)]
+rebuilt        : ScopeId(0): [SymbolId(0)]
+Unresolved references mismatch:
+after transform: []
+rebuilt        : ["require"]
 
 tasks/coverage/babel/packages/babel-parser/test/fixtures/typescript/import/export-import-type-as-identifier/input.ts
-semantic error: Import assignment cannot be used when targeting ECMAScript modules.
+semantic error: Missing SymbolId: "type"
+Missing ReferenceId: "require"
+Binding symbols mismatch:
+after transform: ScopeId(0): [SymbolId(0)]
+rebuilt        : ScopeId(0): [SymbolId(0)]
+Unresolved references mismatch:
+after transform: []
+rebuilt        : ["require"]
 
 tasks/coverage/babel/packages/babel-parser/test/fixtures/typescript/import/export-import-type-require/input.ts
 semantic error: Bindings mismatch:
@@ -1246,7 +1285,17 @@ after transform: ScopeId(0): ["a"]
 rebuilt        : ScopeId(0): []
 
 tasks/coverage/babel/packages/babel-parser/test/fixtures/typescript/import/export-named-import-require/input.ts
-semantic error: Import assignment cannot be used when targeting ECMAScript modules.
+semantic error: Missing SymbolId: "a"
+Missing ReferenceId: "require"
+Binding symbols mismatch:
+after transform: ScopeId(0): [SymbolId(0)]
+rebuilt        : ScopeId(0): [SymbolId(0)]
+Reference symbol mismatch for "a":
+after transform: SymbolId(0) "a"
+rebuilt        : SymbolId(0) "a"
+Unresolved references mismatch:
+after transform: []
+rebuilt        : ["require"]
 
 tasks/coverage/babel/packages/babel-parser/test/fixtures/typescript/import/import-default-and-named-id-type/input.ts
 semantic error: Bindings mismatch:
@@ -1269,7 +1318,14 @@ after transform: ScopeId(0): ["a"]
 rebuilt        : ScopeId(0): []
 
 tasks/coverage/babel/packages/babel-parser/test/fixtures/typescript/import/import-type-as-identifier/input.ts
-semantic error: Import assignment cannot be used when targeting ECMAScript modules.
+semantic error: Missing SymbolId: "type"
+Missing ReferenceId: "require"
+Binding symbols mismatch:
+after transform: ScopeId(0): [SymbolId(0)]
+rebuilt        : ScopeId(0): [SymbolId(0)]
+Unresolved references mismatch:
+after transform: []
+rebuilt        : ["require"]
 
 tasks/coverage/babel/packages/babel-parser/test/fixtures/typescript/import/internal-comments/input.ts
 semantic error: Bindings mismatch:

tasks/transform_conformance/snapshots/babel.snap.md

@@ -1,6 +1,6 @@
 commit: d20b314c
 
-Passed: 317/633
+Passed: 319/633
 
 # All Passed:
 * babel-plugin-transform-class-static-block
@@ -572,7 +572,7 @@ rebuilt        : ScopeId(1): []
 x Output mismatch
 
 
-# babel-plugin-transform-typescript (41/155)
+# babel-plugin-transform-typescript (43/155)
 * cast/as-expression/input.ts
 Unresolved references mismatch:
 after transform: ["T", "x"]
@@ -943,17 +943,6 @@ Scope children mismatch:
 after transform: ScopeId(0): [ScopeId(1)]
 rebuilt        : ScopeId(0): []
 
-* exports/export=/input.ts
-
-  ! TS(1203): Export assignment cannot be used when targeting ECMAScript
-  | modules.
-   ,-[tasks/coverage/babel/packages/babel-plugin-transform-typescript/test/fixtures/exports/export=/input.ts:1:1]
- 1 | export = 0;
-   : ^^^^^^^^^^^
-   `----
-  help: Consider using 'export default' or another module format instead.
-
-
 * exports/imported-types/input.ts
 Bindings mismatch:
 after transform: ScopeId(0): ["A", "B", "C"]
@@ -1140,20 +1129,6 @@ Bindings mismatch:
 after transform: ScopeId(0): ["A", "B"]
 rebuilt        : ScopeId(0): []
 
-* imports/import=-module/input.ts
-
-  ! TS(1202): Import assignment cannot be used when targeting ECMAScript
-  | modules.
-   ,-[tasks/coverage/babel/packages/babel-plugin-transform-typescript/test/fixtures/imports/import=-module/input.ts:1:1]
- 1 | import lib = require("lib");
-   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- 2 | lib();
-   `----
-  help: Consider using 'import * as ns from "mod"',
-                 'import {a} from "mod"', 'import d from "mod"', or another
-        module format instead.
-
-
 * imports/import=-module-to-cjs/input.ts
 Missing SymbolId: "lib"
 Missing ReferenceId: "require"