feat(command): add npm upgrade provider (#701)

command/deno.json

@@ -12,7 +12,8 @@
     "./upgrade/provider/deno-land": "./upgrade/provider/deno_land.ts",
     "./upgrade/provider/github": "./upgrade/provider/github.ts",
     "./upgrade/provider/jsr": "./upgrade/provider/jsr.ts",
-    "./upgrade/provider/nest-land": "./upgrade/provider/nest_land.ts"
+    "./upgrade/provider/nest-land": "./upgrade/provider/nest_land.ts",
+    "./upgrade/provider/npm": "./upgrade/provider/npm.ts"
   },
   "lock": false
 }

command/upgrade/provider.ts

@@ -85,9 +85,10 @@ export abstract class Provider {
     }
 
     const registryUrl = this.getRegistryUrl(name, to);
-    const registry: string = registryUrl.startsWith("jsr:")
-      ? registryUrl
-      : new URL(main || `${name}.ts`, registryUrl).href;
+    const registry: string =
+      registryUrl.startsWith("jsr:") || registryUrl.startsWith("npm:")
+        ? registryUrl
+        : new URL(main || `${name}.ts`, registryUrl).href;
 
     const cmdArgs = ["install"];
 

command/upgrade/provider/npm.ts

@@ -0,0 +1,66 @@
+import { Provider, type Versions } from "../provider.ts";
+
+export type NpmProviderOptions = {
+  package: string;
+} | {
+  scope: string;
+  name?: string;
+};
+
+export class NpmProvider extends Provider {
+  name = "npm";
+  private readonly repositoryUrl = "https://registry.npmjs.org/";
+  private readonly packageName?: string;
+  private readonly packageScope: string;
+
+  constructor(options: NpmProviderOptions) {
+    super();
+    this.packageScope = "package" in options
+      ? options.package.split("/")[0].slice(1)
+      : options.scope;
+    this.packageName = "package" in options
+      ? options.package.split("/")[1]
+      : options.name;
+  }
+
+  async getVersions(
+    name: string,
+  ): Promise<Versions> {
+    const response = await fetch(
+      `${this.repositoryUrl}/@${this.packageScope}/${this.packageName ?? name}`,
+    );
+    if (!response.ok) {
+      throw new Error(
+        "couldn't fetch the latest version - try again after sometime",
+      );
+    }
+
+    const { "dist-tags": { latest }, versions } = await response
+      .json() as NpmApiPackageMetadata;
+
+    return {
+      latest,
+      versions: Object.keys(versions).reverse(),
+    };
+  }
+
+  getRepositoryUrl(name: string): string {
+    return new URL(
+      `@${this.packageScope}/${this.packageName ?? name}`,
+      this.repositoryUrl,
+    ).href;
+  }
+
+  getRegistryUrl(name: string, version: string): string {
+    return `npm:@${this.packageScope}/${this.packageName ?? name}@${version}`;
+  }
+}
+
+type NpmApiPackageMetadata = {
+  "dist-tags": {
+    latest: string;
+  };
+  versions: {
+    [version: string]: unknown;
+  };
+};