import FormData polyfill on Node.js (#392)

* import FormData polyfill on Node.js

* remove type assertion

src/generators/javascript/axios.ts

@@ -82,7 +82,7 @@ export const _toNodeAxios = (
   warnings = warnings || [];
 
   let importCode = "const axios = require('axios');\n";
-  const imports = new Set();
+  const imports: Set<[string, string]> = new Set();
 
   let code = "";
 
@@ -119,6 +119,7 @@ export const _toNodeAxios = (
   }
 
   if (request.multipartUploads) {
+    imports.add(["form-data", "FormData"]);
     code += "const formData = new FormData();\n";
     for (const {
       name,
@@ -129,10 +130,10 @@ export const _toNodeAxios = (
       code += "formData.append(" + repr(name) + ", ";
       if (contentFile === "-") {
         code += "fs.readFileSync(0).toString()";
-        imports.add("fs");
+        imports.add(["fs", "fs"]);
       } else if (contentFile) {
         code += "fs.readFileSync(" + repr(contentFile) + ")";
-        imports.add("fs");
+        imports.add(["fs", "fs"]);
       } else {
         code += repr(content as string);
       }
@@ -262,8 +263,8 @@ export const _toNodeAxios = (
 
   code += ");\n";
 
-  for (const imp of Array.from(imports).sort()) {
-    importCode += "const " + imp + " = require(" + repr(imp as string) + ");\n";
+  for (const [imp, varName] of Array.from(imports).sort()) {
+    importCode += "const " + varName + " = require(" + repr(imp) + ");\n";
   }
 
   return [importCode + "\n" + code, warnings];

test/fixtures/node-axios/get_with_form.js

@@ -1,4 +1,5 @@
 const axios = require('axios');
+const FormData = require('form-data');
 
 const formData = new FormData();
 formData.append('from', 'test@tester.com');

test/fixtures/node-axios/j_patch_file_only.js

@@ -1,4 +1,5 @@
 const axios = require('axios');
+const FormData = require('form-data');
 const fs = require('fs');
 
 const formData = new FormData();

test/fixtures/node-axios/j_patch_file_with_data.js

@@ -1,4 +1,5 @@
 const axios = require('axios');
+const FormData = require('form-data');
 const fs = require('fs');
 
 const formData = new FormData();

test/fixtures/node-axios/j_post_form_f.js

@@ -1,4 +1,5 @@
 const axios = require('axios');
+const FormData = require('form-data');
 
 const formData = new FormData();
 formData.append('d1', 'data1');

test/fixtures/node-axios/multipart_post.js

@@ -1,4 +1,5 @@
 const axios = require('axios');
+const FormData = require('form-data');
 const fs = require('fs');
 
 const formData = new FormData();

test/fixtures/node-axios/multipart_with_headers.js

@@ -1,4 +1,5 @@
 const axios = require('axios');
+const FormData = require('form-data');
 const fs = require('fs');
 
 const formData = new FormData();

test/fixtures/node-axios/post_form.js

@@ -1,4 +1,5 @@
 const axios = require('axios');
+const FormData = require('form-data');
 
 const formData = new FormData();
 formData.append('username', 'davidwalsh');

test/fixtures/node-axios/post_image.js

@@ -1,4 +1,5 @@
 const axios = require('axios');
+const FormData = require('form-data');
 const fs = require('fs');
 
 const formData = new FormData();

test/fixtures/node-axios/post_with_extra_whitespace.js

@@ -1,4 +1,5 @@
 const axios = require('axios');
+const FormData = require('form-data');
 const fs = require('fs');
 
 const formData = new FormData();