String import/export specifier (#12091)

* feat: parse moduleExportName
* feat: add validators
* Support string specifier name in commonjs transform
* Support string specifier name in export-ns-from
* test: add loose testcases
* test: add testcases for amd and umd
* feat: support systemjs
* test: update fixtures fixed in #12110
* add plugin name typings
* test: rename test layout
* feat: implement under moduleStringNames flag
* chore: add plugin syntax module string names
* feat: support ModuleExportName as ModuleExportName
* test: update test fixtures
* fix flow errors
* docs: update AST spec
* feat: support { "some imports" as "some exports" }
* feat: support { "some imports" as "some exports" } in systemjs
* test: add test on `import { "foo" }`
* Address review comments
* add moduleStringNames to missing plugin helpers
* Apply suggestions from code review
* update test fixtures
* Update packages/babel-parser/src/parser/error-message.js
* update test fixtures

Co-Authored-By: Kai Cataldo <kai@kaicataldo.com>
Co-authored-by: Brian Ng <bng412@gmail.com>

packages/babel-plugin-transform-modules-systemjs/test/fixtures/interop-module-string-names/export-from-string-as-string/input.mjs

@@ -0,0 +1 @@
+export { "some imports" as "some exports" } from "foo";

packages/babel-plugin-transform-modules-systemjs/test/fixtures/interop-module-string-names/export-from-string-as-string/output.mjs

@@ -0,0 +1,10 @@
+System.register(["foo"], function (_export, _context) {
+  "use strict";
+
+  return {
+    setters: [function (_foo) {
+      _export("some exports", _foo["some imports"]);
+    }],
+    execute: function () {}
+  };
+});

packages/babel-plugin-transform-modules-systemjs/test/fixtures/interop-module-string-names/export-from-string/input.mjs

@@ -0,0 +1 @@
+export { "some exports" } from "foo";

packages/babel-plugin-transform-modules-systemjs/test/fixtures/interop-module-string-names/export-from-string/output.mjs

@@ -0,0 +1,10 @@
+System.register(["foo"], function (_export, _context) {
+  "use strict";
+
+  return {
+    setters: [function (_foo) {
+      _export("some exports", _foo["some exports"]);
+    }],
+    execute: function () {}
+  };
+});

packages/babel-plugin-transform-modules-systemjs/test/fixtures/interop-module-string-names/export-from/input.mjs

@@ -0,0 +1 @@
+export { foo as "some exports" } from "foo";

packages/babel-plugin-transform-modules-systemjs/test/fixtures/interop-module-string-names/export-from/output.mjs

@@ -0,0 +1,10 @@
+System.register(["foo"], function (_export, _context) {
+  "use strict";
+
+  return {
+    setters: [function (_foo) {
+      _export("some exports", _foo.foo);
+    }],
+    execute: function () {}
+  };
+});

packages/babel-plugin-transform-modules-systemjs/test/fixtures/interop-module-string-names/export-named-string-can-be-identifier/input.mjs

@@ -0,0 +1,2 @@
+var foo, bar;
+export {foo as "defaultExports", bar};

packages/babel-plugin-transform-modules-systemjs/test/fixtures/interop-module-string-names/export-named-string-can-be-identifier/output.mjs

@@ -0,0 +1,15 @@
+System.register([], function (_export, _context) {
+  "use strict";
+
+  var foo, bar;
+
+  _export({
+    defaultExports: void 0,
+    bar: void 0
+  });
+
+  return {
+    setters: [],
+    execute: function () {}
+  };
+});

packages/babel-plugin-transform-modules-systemjs/test/fixtures/interop-module-string-names/export-named/input.mjs

@@ -0,0 +1,2 @@
+var foo, bar;
+export {foo as "default exports", bar};

packages/babel-plugin-transform-modules-systemjs/test/fixtures/interop-module-string-names/export-named/output.mjs

@@ -0,0 +1,15 @@
+System.register([], function (_export, _context) {
+  "use strict";
+
+  var foo, bar;
+
+  _export({
+    "default exports": void 0,
+    bar: void 0
+  });
+
+  return {
+    setters: [],
+    execute: function () {}
+  };
+});

packages/babel-plugin-transform-modules-systemjs/test/fixtures/interop-module-string-names/import-named-string-can-be-identifier/input.mjs

@@ -0,0 +1,3 @@
+import { "defaultImports" as bar} from "foo";
+
+bar;

packages/babel-plugin-transform-modules-systemjs/test/fixtures/interop-module-string-names/import-named-string-can-be-identifier/output.mjs

@@ -0,0 +1,13 @@
+System.register(["foo"], function (_export, _context) {
+  "use strict";
+
+  var bar;
+  return {
+    setters: [function (_foo) {
+      bar = _foo["defaultImports"];
+    }],
+    execute: function () {
+      bar;
+    }
+  };
+});

packages/babel-plugin-transform-modules-systemjs/test/fixtures/interop-module-string-names/import-named/input.mjs

@@ -0,0 +1,3 @@
+import {"default imports" as bar} from "foo";
+
+bar;

packages/babel-plugin-transform-modules-systemjs/test/fixtures/interop-module-string-names/import-named/output.mjs

@@ -0,0 +1,13 @@
+System.register(["foo"], function (_export, _context) {
+  "use strict";
+
+  var bar;
+  return {
+    setters: [function (_foo) {
+      bar = _foo["default imports"];
+    }],
+    execute: function () {
+      bar;
+    }
+  };
+});

packages/babel-plugin-transform-modules-systemjs/test/fixtures/interop-module-string-names/options.json

@@ -0,0 +1,7 @@
+{
+  "plugins": [
+    "external-helpers",
+    "transform-modules-systemjs",
+    "syntax-module-string-names"
+  ]
+}