add includeBytes "macro" that helps factory contract

examples/babel.config.json

@@ -1,5 +1,6 @@
 {
   "plugins": [
+    "near-sdk-js/lib/build-tools/include-bytes",
     "near-sdk-js/lib/build-tools/near-bindgen-exporter",
     ["@babel/plugin-proposal-decorators", {"version": "legacy"}]
   ],

src/build-tools/include-bytes.js

@@ -0,0 +1,37 @@
+import fs from 'fs'
+import path from 'path'
+export default function ({ types: t }) {
+  return {
+    visitor: {
+      CallExpression(p, state) {
+        let name = p.node.callee.name
+        let args = p.node.arguments
+
+        if (name === 'includeBytes') {
+          // Get the path of file
+          var filename = this.file.opts.filename
+
+          // User settings
+          let root = state.opts.root || path.dirname(filename)
+
+          // Read binary file into bytes, so encoding is 'latin1' (each byte is 0-255, become one character)
+          const encoding = 'latin1'
+
+          // Require first arg to be string
+          t.assertStringLiteral(args[0])
+
+          // Error if filename is not found
+          if (filename === undefined || filename === 'unknown')
+            throw new Error('`includeBytes` function called outside of file')
+
+          // Generate and locate the file
+          let fileRelPath = args[0].value // Get literal string value
+          let filePath = path.join(root, fileRelPath)
+          let fileSrc = fs.readFileSync(filePath, { encoding }).toString(encoding)
+
+          p.replaceWith(t.stringLiteral(fileSrc))
+        }
+      },
+    },
+  }
+}

tests/babel.config.json

@@ -1,5 +1,6 @@
 {
   "plugins": [
+    "near-sdk-js/lib/build-tools/include-bytes",
     "near-sdk-js/lib/build-tools/near-bindgen-exporter",
     ["@babel/plugin-proposal-decorators", {"version": "legacy"}]
   ],

tsconfig.json

@@ -27,5 +27,6 @@
     "files": [
         "src/index.ts",
         "src/build-tools/near-bindgen-exporter.js",
+        "src/build-tools/include-bytes.js",
     ]
 }