support node 12 and newer

.npmrc

+engine-strict=true

package-lock.json

@@ -19,6 +19,7 @@
         "@types/jest": "^27.4.0",
         "@types/jsdom": "^16.2.14",
         "@types/minimatch": "^3.0.5",
+        "@types/node": "^12.20.46",
         "@types/node-fetch": "^2.5.12",
         "@typescript-eslint/eslint-plugin": "^5.9.0",
         "@typescript-eslint/parser": "^5.9.0",
@@ -30,6 +31,9 @@
         "prettier": "^2.5.1",
         "ts-jest": "^27.1.2",
         "typescript": "^4.5.4"
+      },
+      "engines": {
+        "node": "> 12"
       }
     },
     "node_modules/@babel/code-frame": {
@@ -1135,9 +1139,9 @@
       "dev": true
     },
     "node_modules/@types/node": {
-      "version": "17.0.8",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-17.0.8.tgz",
-      "integrity": "sha512-YofkM6fGv4gDJq78g4j0mMuGMkZVxZDgtU0JRdx6FgiJDG+0fY0GKVolOV8WqVmEhLCXkQRjwDdKyPxJp/uucg==",
+      "version": "12.20.46",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.20.46.tgz",
+      "integrity": "sha512-cPjLXj8d6anFPzFvOPxS3fvly3Shm5nTfl6g8X5smexixbuGUf7hfr21J5tX9JW+UPStp/5P5R8qrKL5IyVJ+A==",
       "dev": true
     },
     "node_modules/@types/node-fetch": {
@@ -6805,9 +6809,9 @@
       "dev": true
     },
     "@types/node": {
-      "version": "17.0.8",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-17.0.8.tgz",
-      "integrity": "sha512-YofkM6fGv4gDJq78g4j0mMuGMkZVxZDgtU0JRdx6FgiJDG+0fY0GKVolOV8WqVmEhLCXkQRjwDdKyPxJp/uucg==",
+      "version": "12.20.46",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.20.46.tgz",
+      "integrity": "sha512-cPjLXj8d6anFPzFvOPxS3fvly3Shm5nTfl6g8X5smexixbuGUf7hfr21J5tX9JW+UPStp/5P5R8qrKL5IyVJ+A==",
       "dev": true
     },
     "@types/node-fetch": {

package.json

@@ -34,10 +34,14 @@
     "url": "https://phabricator.wikimedia.org/project/profile/5670/"
   },
   "homepage": "https://meta.wikimedia.org/wiki/Web2Cit",
+  "engines": {
+    "node": "> 12"
+  },
   "devDependencies": {
     "@types/jest": "^27.4.0",
     "@types/jsdom": "^16.2.14",
     "@types/minimatch": "^3.0.5",
+    "@types/node": "^12.20.46",
     "@types/node-fetch": "^2.5.12",
     "@typescript-eslint/eslint-plugin": "^5.9.0",
     "@typescript-eslint/parser": "^5.9.0",

src/templates/procedure.ts

@@ -27,7 +27,7 @@ export class TranslationProcedure {
     const selectionOutput = Array.prototype.concat(...selections);
 
     const transformations = await this.transform(selectionOutput);
-    const transformationOutput = transformations.at(-1) ?? [];
+    const transformationOutput = transformations.slice(-1).pop() ?? [];
 
     const procedureOutput = transformations.length
       ? transformationOutput

src/templates/template.ts

@@ -62,7 +62,7 @@ export abstract class BaseTranslationTemplate {
       if (field.name === name) indices.push(index);
       return indices;
     }, []);
-    const index = indices.at(order ?? -1);
+    const index = indices[order === undefined ? indices.length - 1 : order];
     if (index !== undefined) this._fields.splice(index, 1);
   }
 

src/templates/templateField.ts

@@ -135,7 +135,7 @@ export function outputToCitation(
     authorLast &&
     authorLast.reduce((author: MediaWikiCreator[], lastName, index) => {
       // replace missing first names with ""
-      const firstName = authorFirst?.at(index) ?? "";
+      const firstName = authorFirst?.[index] ?? "";
       author.push([firstName, lastName]);
       return author;
     }, []);
@@ -146,21 +146,21 @@ export function outputToCitation(
   // consider fixing by having separate field subclasses,
   // each with a specific output type: string | string[] | ItemType | etc
 
-  const itemType = fields.get("itemType")?.at(0);
+  const itemType = fields.get("itemType")?.[0];
   if (itemType !== undefined && !isItemType(itemType)) {
     throw new Error(`${itemType} is not a valid value for field "itemType"`);
   }
   return {
     itemType,
     author,
-    title: fields.get("title")?.at(0),
-    date: fields.get("date")?.at(0),
-    language: fields.get("language")?.at(0),
+    title: fields.get("title")?.[0],
+    date: fields.get("date")?.[0],
+    language: fields.get("language")?.[0],
     // CSL container-title fields
-    publicationTitle: fields.get("publishedIn")?.at(0),
-    code: fields.get("publishedIn")?.at(0),
-    reporter: fields.get("publishedIn")?.at(0),
+    publicationTitle: fields.get("publishedIn")?.[0],
+    code: fields.get("publishedIn")?.[0],
+    reporter: fields.get("publishedIn")?.[0],
     // CSL publisher field
-    publisher: fields.get("publishedBy")?.at(0),
+    publisher: fields.get("publishedBy")?.[0],
   };
 }