feat: add meta object for import attributes if any

package.json

@@ -50,7 +50,7 @@
   },
   "prettier": "tomer/prettier-config",
   "dependencies": {
-    "es-module-lexer": "^1.5.3",
+    "es-module-lexer": "^1.5.4",
     "slashes": "^3.0.12"
   },
   "devDependencies": {

src/index.js

@@ -23,8 +23,10 @@ export const parseImportsSync = (code, { resolveFrom } = {}) => {
       for (let {
         d: dynamicImportStartIndex,
         ss: statementStartIndex,
+        se: statementEndIndex,
         s: moduleSpecifierStartIndex,
         e: moduleSpecifierEndIndexExclusive,
+        a: metaStartIndex,
       } of imports) {
         const isImportMeta = dynamicImportStartIndex === -2
         if (isImportMeta) {
@@ -69,7 +71,20 @@ export const parseImportsSync = (code, { resolveFrom } = {}) => {
           importClause = parseImportClause(importClauseString)
         }
 
-        yield {
+        let meta
+        if (metaStartIndex > -1) {
+          let metaString = code.slice(metaStartIndex, statementEndIndex).trim()
+          if (isDynamicImport) {
+            metaString = metaString.slice(0, -1)
+            meta = runExpression(metaString)
+          } else {
+            const metaName = code.slice(moduleSpecifierEndIndexExclusive, metaStartIndex).trim()
+            if (metaName) {metaString = '{'+ metaName + ':' + metaString + '}'}
+            meta = runExpression(metaString)
+          }
+        }
+
+        const result = {
           startIndex: statementStartIndex,
           // Include the closing parenthesis for dynamic import
           endIndex: isDynamicImport
@@ -79,7 +94,17 @@ export const parseImportsSync = (code, { resolveFrom } = {}) => {
           moduleSpecifier,
           importClause,
         }
+
+        if (meta) {
+          result.meta = meta
+        }
+
+        yield result
       }
     },
   }
 }
+
+function runExpression(code) {
+  return new Function(`return ${code}`)()
+}

test/index.test.ts

@@ -17,6 +17,26 @@ test(`parseImportsSync throws before WASM load`, () => {
   )
 })
 
+test(`parseImports with meta`, async () => {
+  let code = `import a from 'b'with    {at: '12'}`
+  const imports: any[] = []
+  for (const $import of await parseImports(code)) {imports.push($import)}
+  expect(imports).toHaveLength(1)
+  expect(imports[0].meta).toStrictEqual({with: {at: '12'}})
+
+  code = `import a from 'b'   with    {at: '12'}`
+  imports.length = 0
+  for (const $import of await parseImports(code)) {imports.push($import)}
+  expect(imports).toHaveLength(1)
+  expect(imports[0].meta).toStrictEqual({with: {at: '12'}})
+
+  code = `await import("w", {with: {at: "1"}})`
+  imports.length = 0
+  for (const $import of await parseImports(code)) {imports.push($import)}
+  expect(imports).toHaveLength(1)
+  expect(imports[0].meta).toStrictEqual({with: {at: '1'}})
+})
+
 test.each([
   {
     path: `no-resolve.js`,

tsconfig.json

@@ -1,4 +1,7 @@
 {
   "extends": "tomer/tsconfig",
+  "compilerOptions": {
+    "target": "es2015"
+  },
   "include": ["**/*"]
 }