TypeScript: allowJs: why is `import "x.js"` being ignored?

Source:

// ./src/main.ts
import './console-log';
import './console-log.js';

console.log('console-log main')

// ./src/console-log.js
console.log('console-log JS')

// ./src/console-log.ts
console.log('console-log TS')

Config:

{
    "compilerOptions": {
        "module": "amd",
        "outFile": "./target/main.js",
        "allowJs": true
    },
    "files": ["./src/main.ts"]
}

Output:

// ./target/main.ts
console.log('console-log TS');
define("main", ["require", "exports", './console-log', './console-log.js'], function (require, exports) {
    "use strict";
    console.log('console-log main');
});

Notice that the output is missing the contents of the ./console-log.js import.