[Tests] add test for import.meta

See #119

Author: ljharb

__tests__/helper.js

@@ -18,6 +18,7 @@ const defaultPlugins = [
   // 'nullishCoalescing', // TODO: update to babel 7
 ];
 let plugins = [...defaultPlugins];
+let isESM = false;
 
 export function setParserName(name) {
   parserName = name;
@@ -33,8 +34,13 @@ export function changePlugins(pluginOrFn) {
   }
 }
 
+export function setIsESM() {
+  isESM = true;
+}
+
 beforeEach(() => {
   plugins = [...defaultPlugins];
+  isESM = false;
 });
 
 function parse(code) {
@@ -43,7 +49,7 @@ function parse(code) {
   }
   if (parserName === 'babel') {
     try {
-      return babelParser.parse(code, { plugins, sourceFilename: 'test.js' });
+      return babelParser.parse(code, { plugins, sourceFilename: 'test.js', ...(isESM && { sourceType: 'module' }) });
     } catch (_) {
       // eslint-disable-next-line no-console
       console.warn(`Failed to parse with ${fallbackToBabylon ? 'babylon' : 'Babel'} parser.`);

__tests__/src/getPropLiteralValue-babelparser-test.js

@@ -6,6 +6,7 @@ import {
   describeIfNotBabylon,
   changePlugins,
   setParserName,
+  setIsESM,
 } from '../helper';
 import { getLiteralPropValue } from '../../src/getPropValue';
 
@@ -497,6 +498,21 @@ describe('getLiteralPropValue', () => {
     });
   });
 
+  describeIfNotBabylon('import.meta', () => {
+    beforeEach(() => {
+      setIsESM();
+    });
+
+    it('should return null', () => {
+      const prop = extractProp('<div foo={import.meta.env.whyIsThisNotOnProcess} />');
+
+      const expected = null;
+      const actual = getLiteralPropValue(prop);
+
+      assert.deepEqual(actual, expected);
+    });
+  });
+
   describeIfNotBabylon('Typescript', () => {
     beforeEach(() => {
       changePlugins((pls) => [...pls, 'typescript']);