Separated parser class nodes and began writing compile methods

app/imports/parser/parseTree/IfNode.js

@@ -0,0 +1,40 @@
+import ParseNode from '/imports/parser/parseTree/ParseNode.js';
+import ConstantNode from '/imports/parser/parseTree/ConstantNode.js';
+
+export default class IfNode extends ParseNode {
+  constructor({condition, consequent, alternative}){
+		super();
+    this.condition = condition;
+    this.consequent = consequent;
+    this.alternative = alternative;
+  }
+  compile(){
+    let condition = this.condition.compile();
+    let consequent = this.consequent.compile();
+    let alternative = this.alternative.compile();
+    if (
+      condition.type !== 'string' &&
+			condition.type !== 'number' &&
+			condition.type !== 'boolean'
+    ){
+      // Handle unresolved condition
+      return new ConstantNode({
+        value: `if (${condition.value}) ${consequent.value} else ${alternative.value}`,
+        type: 'uncompiledNode',
+        errors: [
+          ...condition.errors,
+          ...consequent.errors,
+          ...alternative.errors,
+        ],
+      });
+    } else {
+			// So long as the condition reolves, return the correct alternative,
+			// even if it's unresolved
+      if (condition.value){
+        return consequent;
+      } else {
+        return alternative;
+      }
+    }
+  }
+}