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/// reference 

原文： https://www.typescriptlang.org/docs/handbook/triple-slash-directives.html

The /// <reference path="..." /> directive is the most common of this group. It serves as a declaration of dependency between files.

Triple-slash references instruct the compiler to include additional files in the compilation process.

They also serve as a method to order the output when using --out or --outFile. Files are emitted to the output file location in the same order as the input after preprocessing pass.

log.ts

function logMsg(){
    console.log('logMsg');
}

main.ts

///<reference path="./log.ts" />
logMsg();

编译出来的结果：out.js的内容为

function logMsg() {
    console.log('logMsg');
}
///<reference path="./log.ts" />
logMsg();

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