fix: get dependencies during evaluation (#338)

closes #330

Author: satya164

src/__tests__/__snapshots__/preval.test.js.snap

@@ -407,7 +407,7 @@ CSS:
    ;
 }
 
-Dependencies: NA
+Dependencies: core-js/modules/es6.string.raw
 
 `;
 

src/babel/evaluate.js

@@ -107,41 +107,6 @@ module.exports = function evaluate(
     });
   }
 
-  // Collect the list of dependencies that we import
-  const dependencies = requirements.reduce((deps, req) => {
-    if (t.isImportDeclaration(req.path.parentPath)) {
-      deps.push(req.path.parentPath.node.source.value);
-    } else {
-      req.path.traverse({
-        CallExpression(p) {
-          const { callee, arguments: args } = p.node;
-
-          let name;
-
-          if (callee.name === 'require' && args.length === 1) {
-            if (
-              args[0].type === 'Literal' ||
-              args[0].type === 'StringLiteral'
-            ) {
-              name = args[0].value;
-            } else if (
-              args[0].type === 'TemplateLiteral' &&
-              args[0].quasis.length === 1
-            ) {
-              name = args[0].quasis[0].value.cooked;
-            }
-          }
-
-          if (name) {
-            deps.push(name);
-          }
-        },
-      });
-    }
-
-    return deps;
-  }, []);
-
   const expression = t.expressionStatement(
     t.assignmentExpression(
       '=',
@@ -182,6 +147,7 @@ module.exports = function evaluate(
 
   const m = new Module(filename);
 
+  m.dependencies = [];
   m.transform =
     typeof transformer !== 'undefined'
       ? transformer
@@ -278,6 +244,6 @@ module.exports = function evaluate(
 
   return {
     value: m.exports,
-    dependencies,
+    dependencies: ((m.dependencies: any): string[]),
   };
 };

src/babel/module.js

@@ -81,6 +81,8 @@ class Module {
 
   extensions: string[];
 
+  dependencies: ?(string[]);
+
   transform: ?(text: string) => { code: string };
 
   constructor(filename: string) {
@@ -159,6 +161,8 @@ class Module {
       );
     }
 
+    this.dependencies && this.dependencies.push(id);
+
     let m = cache[filename];
 
     if (!m) {