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node_modules/@weborigami/async-tree/src/operations/concat.js

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+import { toString } from "../utilities.js";
+import deepValuesIterator from "./deepValuesIterator.js";
+
+/**
+ * Concatenate the deep text values in a tree.
+ *
+ * @typedef {import("@weborigami/types").AsyncTree} AsyncTree
+ *
+ * @this {AsyncTree|null}
+ * @param {import("../../index.ts").Treelike} treelike
+ */
+export default async function concatTreeValues(treelike) {
+  if (!treelike) {
+    const error = new TypeError(`concat: The tree isn't defined.`);
+    /** @type {any} */ (error).position = 0;
+    throw error;
+  }
+
+  const strings = [];
+  for await (const value of deepValuesIterator(treelike, { expand: true })) {
+    let string;
+    if (value === null) {
+      console.warn("Warning: Origami template encountered a null value");
+      string = "null";
+    } else if (value === undefined) {
+      console.warn("Warning: Origami template encountered an undefined value");
+      string = "undefined";
+    } else {
+      string = toString(value);
+    }
+    strings.push(string);
+  }
+  return strings.join("");
+}