package: migrate to ES modules

src/commands/cmake.ts

@@ -1,4 +1,4 @@
-import { optFlag, undefList } from "./common";
+import { optFlag, undefList } from "./common.js";
 
 export type CMakeDefinition = {
     name: string,

src/commands/compiler.ts

@@ -1,4 +1,4 @@
-import { optFlag, optMultiFlag, optSwitch, undefList } from "./common";
+import { optFlag, optMultiFlag, optSwitch, undefList } from "./common.js";
 
 export interface GeneralOptions {
     output?: string;

src/commands/spec.ts

@@ -1,4 +1,4 @@
-import { optFlag, optSwitch, undefList } from "./common";
+import { optFlag, optSwitch, undefList } from "./common.js";
 
 export interface RunCPUOptions {
     /**

src/commands/systemd.ts

@@ -1,4 +1,4 @@
-import { optFlag, optSwitch } from "./common";
+import { optFlag, optSwitch } from "./common.js";
 
 export interface SystemdRunOptions {
     /**