Export build function separately

Author: bkeepers

lib/expression.js

@@ -1,24 +1,26 @@
 import { v4 as uuidv4 } from 'uuid'
 import { Schema } from './schemas'
 
-export class Expression {
-  static build (expression, attrs = {}) {
-    if (expression instanceof Function || expression instanceof Constant) {
-      return expression.clone(attrs)
-    }
+export function build (expression, attrs = {}) {
+  if (expression instanceof Function || expression instanceof Constant) {
+    return expression.clone(attrs)
+  }
 
-    if (['number', 'string', 'boolean'].includes(typeof expression) || expression === null) {
-      return new Constant({ value: expression, ...attrs })
-    } else if (typeof expression === 'object') {
-      if (Object.keys(expression).length !== 1) {
-        throw new TypeError(`Invalid expression: ${JSON.stringify(expression)}`)
-      }
-      const name = Object.keys(expression)[0]
-      return new Function({ name, args: expression[name] })
-    } else {
+  if (['number', 'string', 'boolean'].includes(typeof expression) || expression === null) {
+    return new Constant({ value: expression, ...attrs })
+  } else if (typeof expression === 'object') {
+    if (Object.keys(expression).length !== 1) {
       throw new TypeError(`Invalid expression: ${JSON.stringify(expression)}`)
     }
+    const name = Object.keys(expression)[0]
+    return new Function({ name, args: expression[name] })
+  } else {
+    throw new TypeError(`Invalid expression: ${JSON.stringify(expression)}`)
   }
+}
+
+export class Expression {
+  static build = build
 
   constructor ({ id = uuidv4(), parent = undefined }) {
     this.id = id

lib/index.js

@@ -1,3 +1,3 @@
 export { Schema, schemas, BaseURI } from './schemas'
-export { Expression, Function, Constant } from './expression'
+export { build, Expression, Function, Constant } from './expression'
 export { default as examples } from '../examples'