redirect [npm] /dt to /d18m (#10033)

* redirect [npm] /dt to /d18m

* fix unit test

services/npm/npm-downloads-redirect.service.js

@@ -0,0 +1,11 @@
+import { redirector } from '../index.js'
+
+export default redirector({
+  category: 'downloads',
+  route: {
+    base: 'npm/dt',
+    pattern: ':packageName+',
+  },
+  transformPath: ({ packageName }) => `/npm/d18m/${packageName}`,
+  dateAdded: new Date('2024-03-19'),
+})

services/npm/npm-downloads.service.js

@@ -28,7 +28,7 @@ const intervalMap = {
     transform: json => json.downloads,
     interval: 'year',
   },
-  dt: {
+  d18m: {
     query: 'range/1000-01-01:3000-01-01',
     // https://github.com/npm/registry/blob/master/docs/download-counts.md#output-1
     schema: Joi.object({
@@ -48,7 +48,7 @@ export default class NpmDownloads extends BaseJsonService {
 
   static route = {
     base: 'npm',
-    pattern: ':interval(dw|dm|dy|dt)/:scope(@.+)?/:packageName',
+    pattern: ':interval(dw|dm|dy|d18m)/:scope(@.+)?/:packageName',
   }
 
   static openApi = {
@@ -59,7 +59,8 @@ export default class NpmDownloads extends BaseJsonService {
           {
             name: 'interval',
             example: 'dw',
-            description: 'Weekly, Monthly, Yearly, or Total downloads',
+            description:
+              'Downloads in the last Week, Month, Year, or 18 Months',
             schema: { type: 'string', enum: this.getEnum('interval') },
           },
           {

services/npm/npm-downloads.spec.js

@@ -2,7 +2,7 @@ import { test, given } from 'sazerac'
 import NpmDownloads from './npm-downloads.service.js'
 
 describe('NpmDownloads', function () {
-  test(NpmDownloads._intervalMap.dt.transform, () => {
+  test(NpmDownloads._intervalMap.d18m.transform, () => {
     given({
       downloads: [
         { downloads: 2, day: '2018-01-01' },
@@ -13,7 +13,7 @@ describe('NpmDownloads', function () {
 
   test(NpmDownloads.render, () => {
     given({
-      interval: 'dt',
+      interval: 'd18m',
       downloadCount: 0,
     }).expect({
       color: 'red',

services/npm/npm-downloads.tester.js

@@ -12,20 +12,30 @@ t.create('weekly downloads of @cycle/core')
   .get('/dw/@cycle/core.json')
   .expectBadge({ label: 'downloads', message: isMetricOverTimePeriod })
 
-t.create('total downloads of left-pad').get('/dt/left-pad.json').expectBadge({
-  label: 'downloads',
-  message: isMetric,
-  color: 'brightgreen',
-})
+t.create('downloads in last 18 months of left-pad')
+  .get('/d18m/left-pad.json')
+  .expectBadge({
+    label: 'downloads',
+    message: isMetric,
+    color: 'brightgreen',
+  })
 
-t.create('total downloads of @cycle/core')
-  .get('/dt/@cycle/core.json')
+t.create('downloads in last 18 months of @cycle/core')
+  .get('/d18m/@cycle/core.json')
   .expectBadge({ label: 'downloads', message: isMetric })
 
 t.create('downloads of unknown package')
-  .get('/dt/npm-api-does-not-have-this-package.json')
+  .get('/dy/npm-api-does-not-have-this-package.json')
   .expectBadge({
     label: 'downloads',
     message: 'package not found or too new',
     color: 'red',
   })
+
+t.create('Total downloads redirect: unscoped package')
+  .get('/dt/left-pad.svg')
+  .expectRedirect('/npm/d18m/left-pad.svg')
+
+t.create('Total downloads redirect: scoped package')
+  .get('/dt/@cycle/core.svg')
+  .expectRedirect('/npm/d18m/@cycle/core.svg')