2 files changed, 54 insertions, 0 deletions
diff --git a/node_modules/acorn-dynamic-import/src/index.js b/node_modules/acorn-dynamic-import/src/index.js
new file mode 100644
index 000000000..6eb1d4140
--- /dev/null
+++ b/node_modules/acorn-dynamic-import/src/index.js
@@ -0,0 +1,4 @@
+import * as acorn from 'acorn';
+import inject from './inject';
+
+export default inject(acorn);
diff --git a/node_modules/acorn-dynamic-import/src/inject.js b/node_modules/acorn-dynamic-import/src/inject.js
new file mode 100644
index 000000000..7a666b278
--- /dev/null
+++ b/node_modules/acorn-dynamic-import/src/inject.js
@@ -0,0 +1,50 @@
+/* eslint-disable no-underscore-dangle */
+
+export default function injectDynamicImport(acorn) {
+  const tt = acorn.tokTypes;
+
+  // NOTE: This allows `yield import()` to parse correctly.
+  tt._import.startsExpr = true;
+
+  function parseDynamicImport() {
+    const node = this.startNode();
+    this.next();
+    if (this.type !== tt.parenL) {
+      this.unexpected();
+    }
+    return this.finishNode(node, 'Import');
+  }
+
+  function peekNext() {
+    return this.input[this.pos];
+  }
+
+  // eslint-disable-next-line no-param-reassign
+  acorn.plugins.dynamicImport = function dynamicImportPlugin(instance) {
+    instance.extend('parseStatement', nextMethod => (
+      function parseStatement(...args) {
+        const node = this.startNode();
+        if (this.type === tt._import) {
+          const nextToken = peekNext.call(this);
+          if (nextToken === tt.parenL.label) {
+            const expr = this.parseExpression();
+            return this.parseExpressionStatement(node, expr);
+          }
+        }
+
+        return nextMethod.apply(this, args);
+      }
+    ));
+
+    instance.extend('parseExprAtom', nextMethod => (
+      function parseExprAtom(refDestructuringErrors) {
+        if (this.type === tt._import) {
+          return parseDynamicImport.call(this);
+        }
+        return nextMethod.call(this, refDestructuringErrors);
+      }
+    ));
+  };
+
+  return acorn;
+}